mbed official
mbed library sources. Supersedes mbed-src.
Dependents: Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more
Diff: targets/TARGET_Silicon_Labs/TARGET_EFM32/serial_api.c
- Revision:
- 149:156823d33999
- Parent:
- 144:ef7eb2e8f9f7
- Child:
- 150:02e0a0aed4ec
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_Silicon_Labs/TARGET_EFM32/serial_api.c Fri Oct 28 11:17:30 2016 +0100
@@ -0,0 +1,2194 @@
+/***************************************************************************//**
+ * @file serial_api.c
+ *******************************************************************************
+ * @section License
+ * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
+ *******************************************************************************
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ ******************************************************************************/
+
+#include "device.h"
+#include "clocking.h"
+#if DEVICE_SERIAL
+
+#include "mbed_assert.h"
+#include "serial_api.h"
+#include "serial_api_HAL.h"
+#include <string.h>
+#include <stdbool.h>
+
+#include "pinmap.h"
+#include "pinmap_function.h"
+#include "PeripheralPins.h"
+#include "PeripheralNames.h"
+
+#include "em_usart.h"
+#include "em_leuart.h"
+#include "em_cmu.h"
+#include "em_dma.h"
+#include "dma_api_HAL.h"
+#include "dma_api.h"
+#include "sleep_api.h"
+#include "buffer.h"
+#include "sleepmodes.h"
+
+#define SERIAL_LEAST_ACTIVE_SLEEPMODE EM1
+#define SERIAL_LEAST_ACTIVE_SLEEPMODE_LEUART EM2
+
+/** Validation of LEUART register block pointer reference
+ * for assert statements. */
+#if !defined(LEUART_COUNT)
+#define LEUART_REF_VALID(ref) (0)
+#elif (LEUART_COUNT == 1)
+#define LEUART_REF_VALID(ref) ((ref) == LEUART0)
+#elif (LEUART_COUNT == 2)
+#define LEUART_REF_VALID(ref) (((ref) == LEUART0) || ((ref) == LEUART1))
+#else
+#error Undefined number of low energy UARTs (LEUART).
+#endif
+
+/* Store IRQ id for each UART */
+static uint32_t serial_irq_ids[MODULES_SIZE_SERIAL] = { 0 };
+/* Interrupt handler from mbed common */
+static uart_irq_handler irq_handler;
+/* Keep track of incoming DMA IRQ's */
+static bool serial_dma_irq_fired[DMACTRL_CH_CNT] = { false };
+
+/* Serial interface on USBTX/USBRX retargets stdio */
+int stdio_uart_inited = 0;
+serial_t stdio_uart;
+
+static void uart_irq(UARTName, SerialIrq);
+static uint8_t serial_get_index(serial_t *obj);
+static void serial_enable(serial_t *obj, uint8_t enable);
+static void serial_enable_pins(serial_t *obj, uint8_t enable);
+static void serial_set_route(serial_t *obj);
+static IRQn_Type serial_get_rx_irq_index(serial_t *obj);
+static IRQn_Type serial_get_tx_irq_index(serial_t *obj);
+static CMU_Clock_TypeDef serial_get_clock(serial_t *obj);
+static void serial_dmaSetupChannel(serial_t *obj, bool tx_nrx);
+static void serial_rx_abort_asynch_intern(serial_t *obj, int unblock_sleep);
+static void serial_tx_abort_asynch_intern(serial_t *obj, int unblock_sleep);
+static void serial_block_sleep(serial_t *obj);
+static void serial_unblock_sleep(serial_t *obj);
+static void serial_leuart_baud(serial_t *obj, int baudrate);
+
+/* ISRs for RX and TX events */
+#ifdef UART0
+static void uart0_rx_irq() { uart_irq(UART_0, RxIrq); }
+static void uart0_tx_irq() { uart_irq(UART_0, TxIrq); USART_IntClear((USART_TypeDef*)UART_0, USART_IFC_TXC);}
+#endif
+#ifdef UART1
+static void uart1_rx_irq() { uart_irq(UART_1, RxIrq); }
+static void uart1_tx_irq() { uart_irq(UART_1, TxIrq); USART_IntClear((USART_TypeDef*)UART_1, USART_IFC_TXC);}
+#endif
+#ifdef USART0
+static void usart0_rx_irq() { uart_irq(USART_0, RxIrq); }
+static void usart0_tx_irq() { uart_irq(USART_0, TxIrq); USART_IntClear((USART_TypeDef*)USART_0, USART_IFC_TXC);}
+#endif
+#ifdef USART1
+static void usart1_rx_irq() { uart_irq(USART_1, RxIrq); }
+static void usart1_tx_irq() { uart_irq(USART_1, TxIrq); USART_IntClear((USART_TypeDef*)USART_1, USART_IFC_TXC);}
+#endif
+#ifdef USART2
+static void usart2_rx_irq() { uart_irq(USART_2, RxIrq); }
+static void usart2_tx_irq() { uart_irq(USART_2, TxIrq); USART_IntClear((USART_TypeDef*)USART_2, USART_IFC_TXC);}
+#endif
+#ifdef LEUART0
+static void leuart0_irq()
+{
+ if(LEUART_IntGetEnabled(LEUART0) & (LEUART_IF_RXDATAV | LEUART_IF_FERR | LEUART_IF_PERR | LEUART_IF_RXOF)) {
+ uart_irq(LEUART_0, RxIrq);
+ }
+
+ if(LEUART_IntGetEnabled(LEUART0) & (LEUART_IF_TXC | LEUART_IF_TXBL | LEUART_IF_TXOF)) {
+ uart_irq(LEUART_0, TxIrq);
+ LEUART_IntClear(LEUART0, LEUART_IFC_TXC);
+ }
+}
+#endif
+#ifdef LEUART1
+static void leuart1_irq()
+{
+ if(LEUART_IntGetEnabled(LEUART1) & (LEUART_IF_RXDATAV | LEUART_IF_FERR | LEUART_IF_PERR | LEUART_IF_RXOF)) {
+ uart_irq(LEUART_1, RxIrq);
+ }
+
+ if(LEUART_IntGetEnabled(LEUART1) & (LEUART_IF_TXC | LEUART_IF_TXBL | LEUART_IF_TXOF)) {
+ uart_irq(LEUART_1, TxIrq);
+ LEUART_IntClear(LEUART1, LEUART_IFC_TXC);
+ }
+}
+#endif
+
+/**
+ * Initialize the UART using default settings, overridden by settings from serial object
+ *
+ * @param obj pointer to serial object
+ */
+static void uart_init(serial_t *obj, uint32_t baudrate, SerialParity parity, int stop_bits)
+{
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ LEUART_Init_TypeDef init = LEUART_INIT_DEFAULT;
+
+ if (stop_bits == 2) {
+ init.stopbits = leuartStopbits2;
+ } else {
+ init.stopbits = leuartStopbits1;
+ }
+
+ switch (parity) {
+ case ParityOdd:
+ case ParityForced0:
+ init.parity = leuartOddParity;
+ break;
+ case ParityEven:
+ case ParityForced1:
+ init.parity = leuartEvenParity;
+ break;
+ default: /* ParityNone */
+ init.parity = leuartNoParity;
+ break;
+ }
+
+ init.enable = leuartDisable;
+ init.baudrate = 9600;
+ init.databits = leuartDatabits8;
+#ifdef LEUART_USING_LFXO
+ init.refFreq = LEUART_LF_REF_FREQ;
+#else
+ init.refFreq = LEUART_REF_FREQ;
+#endif
+ LEUART_Init(obj->serial.periph.leuart, &init);
+
+ if (baudrate != 9600) {
+ serial_baud(obj, baudrate);
+ }
+ } else {
+ USART_InitAsync_TypeDef init = USART_INITASYNC_DEFAULT;
+
+ if (stop_bits == 2) {
+ init.stopbits = usartStopbits2;
+ } else {
+ init.stopbits = usartStopbits1;
+ }
+ switch (parity) {
+ case ParityOdd:
+ case ParityForced0:
+ init.parity = usartOddParity;
+ break;
+ case ParityEven:
+ case ParityForced1:
+ init.parity = usartEvenParity;
+ break;
+ default: /* ParityNone */
+ init.parity = usartNoParity;
+ break;
+ }
+
+ init.enable = usartDisable;
+ init.baudrate = baudrate;
+ init.oversampling = usartOVS16;
+ init.databits = usartDatabits8;
+ init.refFreq = REFERENCE_FREQUENCY;
+
+ USART_InitAsync(obj->serial.periph.uart, &init);
+ }
+}
+/**
+* Get index of serial object, relating it to the physical peripheral.
+*
+* @param obj pointer to serial peripheral (= base address of periph)
+* @return internal index of U(S)ART peripheral
+*/
+static inline uint8_t serial_pointer_get_index(uint32_t serial_ptr)
+{
+ uint8_t index = 0;
+#ifdef UART0
+ if (serial_ptr == UART_0) return index;
+ index++;
+#endif
+#ifdef UART1
+ if (serial_ptr == UART_1) return index;
+ index++;
+#endif
+#ifdef USART0
+ if (serial_ptr == USART_0) return index;
+ index++;
+#endif
+#ifdef USART1
+ if (serial_ptr == USART_1) return index;
+ index++;
+#endif
+#ifdef USART2
+ if (serial_ptr == USART_2) return index;
+ index++;
+#endif
+#ifdef LEUART0
+ if (serial_ptr == LEUART_0) return index;
+ index++;
+#endif
+#ifdef LEUART1
+ if (serial_ptr == LEUART_1) return index;
+ index++;
+#endif
+ return 0;
+}
+
+/**
+* Get index of serial object, relating it to the physical peripheral.
+*
+* @param obj pointer to serial object (mbed object)
+* @return internal index of U(S)ART peripheral
+*/
+static inline uint8_t serial_get_index(serial_t *obj)
+{
+ return serial_pointer_get_index((uint32_t)obj->serial.periph.uart);
+}
+
+/**
+* Get index of serial object RX IRQ, relating it to the physical peripheral.
+*
+* @param obj pointer to serial object
+* @return internal NVIC RX IRQ index of U(S)ART peripheral
+*/
+static inline IRQn_Type serial_get_rx_irq_index(serial_t *obj)
+{
+ switch ((uint32_t)obj->serial.periph.uart) {
+#ifdef UART0
+ case UART_0:
+ return UART0_RX_IRQn;
+#endif
+#ifdef UART1
+ case UART_1:
+ return UART1_RX_IRQn;
+#endif
+#ifdef USART0
+ case USART_0:
+ return USART0_RX_IRQn;
+#endif
+#ifdef USART1
+ case USART_1:
+ return USART1_RX_IRQn;
+#endif
+#ifdef USART2
+ case USART_2:
+ return USART2_RX_IRQn;
+#endif
+#ifdef LEUART0
+ case LEUART_0:
+ return LEUART0_IRQn;
+#endif
+#ifdef LEUART1
+ case LEUART_1:
+ return LEUART1_IRQn;
+#endif
+ default:
+ MBED_ASSERT(0);
+ }
+ return (IRQn_Type)0;
+}
+
+/**
+* Get index of serial object TX IRQ, relating it to the physical peripheral.
+*
+* @param obj pointer to serial object
+* @return internal NVIC TX IRQ index of U(S)ART peripheral
+*/
+static inline IRQn_Type serial_get_tx_irq_index(serial_t *obj)
+{
+ switch ((uint32_t)obj->serial.periph.uart) {
+#ifdef UART0
+ case UART_0:
+ return UART0_TX_IRQn;
+#endif
+#ifdef UART1
+ case UART_1:
+ return UART1_TX_IRQn;
+#endif
+#ifdef USART0
+ case USART_0:
+ return USART0_TX_IRQn;
+#endif
+#ifdef USART1
+ case USART_1:
+ return USART1_TX_IRQn;
+#endif
+#ifdef USART2
+ case USART_2:
+ return USART2_TX_IRQn;
+#endif
+#ifdef LEUART0
+ case LEUART_0:
+ return LEUART0_IRQn;
+#endif
+#ifdef LEUART1
+ case LEUART_1:
+ return LEUART1_IRQn;
+#endif
+ default:
+ MBED_ASSERT(0);
+ }
+ return (IRQn_Type)0;
+}
+
+/**
+* Get clock tree for serial peripheral pointed to by obj.
+*
+* @param obj pointer to serial object
+* @return CMU_Clock_TypeDef for U(S)ART
+*/
+inline CMU_Clock_TypeDef serial_get_clock(serial_t *obj)
+{
+ switch ((uint32_t)obj->serial.periph.uart) {
+#ifdef UART0
+ case UART_0:
+ return cmuClock_UART0;
+#endif
+#ifdef UART1
+ case UART_1:
+ return cmuClock_UART1;
+#endif
+#ifdef USART0
+ case USART_0:
+ return cmuClock_USART0;
+#endif
+#ifdef USART1
+ case USART_1:
+ return cmuClock_USART1;
+#endif
+#ifdef USART2
+ case USART_2:
+ return cmuClock_USART2;
+#endif
+#ifdef LEUART0
+ case LEUART_0:
+ return cmuClock_LEUART0;
+#endif
+#ifdef LEUART1
+ case LEUART_1:
+ return cmuClock_LEUART1;
+#endif
+ default:
+ return cmuClock_HFPER;
+ }
+}
+
+void serial_preinit(serial_t *obj, PinName tx, PinName rx)
+{
+ /* Get UART object connected to the given pins */
+ UARTName uart_tx = (UARTName) pinmap_peripheral(tx, PinMap_UART_TX);
+ UARTName uart_rx = (UARTName) pinmap_peripheral(rx, PinMap_UART_RX);
+ /* Check that pins are connected to same UART */
+ UARTName uart = (UARTName) pinmap_merge(uart_tx, uart_rx);
+ MBED_ASSERT((int) uart != NC);
+
+ obj->serial.periph.uart = (USART_TypeDef *) uart;
+
+ /* Get location */
+ uint32_t uart_tx_loc = pin_location(tx, PinMap_UART_TX);
+ uint32_t uart_rx_loc = pin_location(rx, PinMap_UART_RX);
+
+#if defined(_SILICON_LABS_32B_PLATFORM_1)
+ /* Check that pins are used by same location for the given UART */
+ obj->serial.location = pinmap_merge(uart_tx_loc, uart_rx_loc);
+ MBED_ASSERT(obj->serial.location != (uint32_t)NC);
+#else
+ obj->serial.location_tx = uart_tx_loc;
+ obj->serial.location_rx = uart_rx_loc;
+#endif
+
+ /* Store pins in object for easy disabling in serial_free() */
+ //TODO: replace all usages with AF_USARTx_TX_PORT(location) macro to save 8 bytes from struct
+ obj->serial.rx_pin = rx;
+ obj->serial.tx_pin = tx;
+
+ /* Select interrupt */
+ switch ((uint32_t)obj->serial.periph.uart) {
+#ifdef UART0
+ case UART_0:
+ NVIC_SetVector(UART0_RX_IRQn, (uint32_t) &uart0_rx_irq);
+ NVIC_SetVector(UART0_TX_IRQn, (uint32_t) &uart0_tx_irq);
+ NVIC_SetPriority(UART0_TX_IRQn, 1);
+ break;
+#endif
+#ifdef UART1
+ case UART_1:
+ NVIC_SetVector(UART1_RX_IRQn, (uint32_t) &uart1_rx_irq);
+ NVIC_SetVector(UART1_TX_IRQn, (uint32_t) &uart1_tx_irq);
+ NVIC_SetPriority(UART1_TX_IRQn, 1);
+ break;
+#endif
+#ifdef USART0
+ case USART_0:
+ NVIC_SetVector(USART0_RX_IRQn, (uint32_t) &usart0_rx_irq);
+ NVIC_SetVector(USART0_TX_IRQn, (uint32_t) &usart0_tx_irq);
+ NVIC_SetPriority(USART0_TX_IRQn, 1);
+ break;
+#endif
+#ifdef USART1
+ case USART_1:
+ NVIC_SetVector(USART1_RX_IRQn, (uint32_t) &usart1_rx_irq);
+ NVIC_SetVector(USART1_TX_IRQn, (uint32_t) &usart1_tx_irq);
+ NVIC_SetPriority(USART1_TX_IRQn, 1);
+ break;
+#endif
+#ifdef USART2
+ case USART_2:
+ NVIC_SetVector(USART2_RX_IRQn, (uint32_t) &usart2_rx_irq);
+ NVIC_SetVector(USART2_TX_IRQn, (uint32_t) &usart2_tx_irq);
+ NVIC_SetPriority(USART2_TX_IRQn, 1);
+ break;
+#endif
+#ifdef LEUART0
+ case LEUART_0:
+ NVIC_SetVector(LEUART0_IRQn, (uint32_t) &leuart0_irq);
+ break;
+#endif
+#ifdef LEUART1
+ case LEUART_1:
+ NVIC_SetVector(LEUART1_IRQn, (uint32_t) &leuart1_irq);
+ break;
+#endif
+ }
+}
+
+static void serial_enable_pins(serial_t *obj, uint8_t enable)
+{
+ if (enable) {
+ /* Configure GPIO pins*/
+ if(obj->serial.rx_pin != NC) {
+ pin_mode(obj->serial.rx_pin, Input);
+ }
+ /* Set DOUT first to prevent glitches */
+ if(obj->serial.tx_pin != NC) {
+ GPIO_PinOutSet((GPIO_Port_TypeDef)(obj->serial.tx_pin >> 4 & 0xF), obj->serial.tx_pin & 0xF);
+ pin_mode(obj->serial.tx_pin, PushPull);
+ }
+ } else {
+ if(obj->serial.rx_pin != NC) {
+ pin_mode(obj->serial.rx_pin, Disabled);
+ }
+ if(obj->serial.tx_pin != NC) {
+ pin_mode(obj->serial.tx_pin, Disabled);
+ }
+ }
+}
+
+static void serial_set_route(serial_t *obj)
+{
+ /* Enable pins for UART at correct location */
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+#ifdef _LEUART_ROUTE_LOCATION_SHIFT
+ obj->serial.periph.leuart->ROUTE = (obj->serial.location << _LEUART_ROUTE_LOCATION_SHIFT);
+ if(obj->serial.tx_pin != (uint32_t)NC) {
+ obj->serial.periph.leuart->ROUTE |= LEUART_ROUTE_TXPEN;
+ } else {
+ obj->serial.periph.leuart->ROUTE &= ~LEUART_ROUTE_TXPEN;
+ }
+ if(obj->serial.rx_pin != (uint32_t)NC) {
+ obj->serial.periph.leuart->ROUTE |= LEUART_ROUTE_RXPEN;
+ } else {
+ obj->serial.periph.leuart->CMD = LEUART_CMD_RXBLOCKEN;
+ obj->serial.periph.leuart->ROUTE &= ~LEUART_ROUTE_RXPEN;
+ }
+#else
+ if(obj->serial.location_tx != NC) {
+ obj->serial.periph.leuart->ROUTELOC0 = (obj->serial.periph.leuart->ROUTELOC0 & (~_LEUART_ROUTELOC0_TXLOC_MASK)) | (obj->serial.location_tx << _LEUART_ROUTELOC0_TXLOC_SHIFT);
+ obj->serial.periph.leuart->ROUTEPEN = (obj->serial.periph.leuart->ROUTEPEN & (~_LEUART_ROUTEPEN_TXPEN_MASK)) | LEUART_ROUTEPEN_TXPEN;
+ } else {
+ obj->serial.periph.leuart->ROUTEPEN = (obj->serial.periph.leuart->ROUTEPEN & (~_LEUART_ROUTEPEN_TXPEN_MASK));
+ }
+ if(obj->serial.location_rx != NC) {
+ obj->serial.periph.leuart->ROUTELOC0 = (obj->serial.periph.leuart->ROUTELOC0 & (~_LEUART_ROUTELOC0_RXLOC_MASK)) | (obj->serial.location_rx << _LEUART_ROUTELOC0_RXLOC_SHIFT);
+ obj->serial.periph.leuart->ROUTEPEN = (obj->serial.periph.leuart->ROUTEPEN & (~_LEUART_ROUTEPEN_RXPEN_MASK)) | LEUART_ROUTEPEN_RXPEN;
+ } else {
+ obj->serial.periph.leuart->CMD = LEUART_CMD_RXBLOCKEN;
+ obj->serial.periph.leuart->ROUTEPEN = (obj->serial.periph.leuart->ROUTEPEN & (~_LEUART_ROUTEPEN_RXPEN_MASK));
+ }
+#endif
+ } else {
+#ifdef _USART_ROUTE_LOCATION_SHIFT
+ obj->serial.periph.uart->ROUTE = (obj->serial.location << _LEUART_ROUTE_LOCATION_SHIFT);
+ if(obj->serial.tx_pin != (uint32_t)NC) {
+ obj->serial.periph.uart->ROUTE |= USART_ROUTE_TXPEN;
+ } else {
+ obj->serial.periph.uart->ROUTE &= ~USART_ROUTE_TXPEN;
+ }
+ if(obj->serial.rx_pin != (uint32_t)NC) {
+ obj->serial.periph.uart->ROUTE |= USART_ROUTE_RXPEN;
+ } else {
+ obj->serial.periph.uart->CMD = USART_CMD_RXBLOCKEN;
+ obj->serial.periph.uart->ROUTE &= ~USART_ROUTE_RXPEN;
+ }
+#else
+ if(obj->serial.location_tx != NC) {
+ obj->serial.periph.uart->ROUTELOC0 = (obj->serial.periph.uart->ROUTELOC0 & (~_USART_ROUTELOC0_TXLOC_MASK)) | (obj->serial.location_tx << _USART_ROUTELOC0_TXLOC_SHIFT);
+ obj->serial.periph.uart->ROUTEPEN = (obj->serial.periph.uart->ROUTEPEN & (~_USART_ROUTEPEN_TXPEN_MASK)) | USART_ROUTEPEN_TXPEN;
+ } else {
+ obj->serial.periph.uart->ROUTEPEN = (obj->serial.periph.uart->ROUTEPEN & (~_USART_ROUTEPEN_TXPEN_MASK));
+ }
+ if(obj->serial.location_rx != NC) {
+ obj->serial.periph.uart->ROUTELOC0 = (obj->serial.periph.uart->ROUTELOC0 & (~_USART_ROUTELOC0_RXLOC_MASK)) | (obj->serial.location_rx << _USART_ROUTELOC0_RXLOC_SHIFT);
+ obj->serial.periph.uart->ROUTEPEN = (obj->serial.periph.uart->ROUTEPEN & (~_USART_ROUTEPEN_RXPEN_MASK)) | USART_ROUTEPEN_RXPEN;
+ } else {
+ obj->serial.periph.uart->CMD = USART_CMD_RXBLOCKEN;
+ obj->serial.periph.uart->ROUTEPEN = (obj->serial.periph.uart->ROUTEPEN & (~_USART_ROUTEPEN_RXPEN_MASK));
+ }
+#endif
+ }
+}
+
+void serial_init(serial_t *obj, PinName tx, PinName rx)
+{
+ uint32_t baudrate;
+ uint32_t uart_for_stdio = false;
+
+ serial_preinit(obj, tx, rx);
+
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ // Set up LEUART clock tree
+#ifdef LEUART_USING_LFXO
+ //set to use LFXO
+ CMU_ClockEnable(cmuClock_CORELE, true);
+ CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_LFXO);
+#else
+ //set to use high-speed clock
+#ifdef _SILICON_LABS_32B_PLATFORM_2
+ CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_HFCLKLE);
+#else
+ CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_CORELEDIV2);
+#endif
+#endif
+ }
+
+ CMU_ClockEnable(serial_get_clock(obj), true);
+
+ /* Limitations of board controller: CDC port only supports 115kbaud */
+ if(((tx == STDIO_UART_TX) || (rx == STDIO_UART_RX))
+ && (obj->serial.periph.uart == (USART_TypeDef*)STDIO_UART )
+ ) {
+ baudrate = 115200;
+ uart_for_stdio = true;
+ } else {
+ baudrate = 9600;
+ }
+
+ /* Configure UART for async operation */
+ uart_init(obj, baudrate, ParityNone, 1);
+
+ /* Enable pins for UART at correct location */
+ serial_set_route(obj);
+
+ /* Reset interrupts */
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ obj->serial.periph.leuart->IFC = LEUART_IFC_TXC;
+ obj->serial.periph.leuart->CTRL |= LEUART_CTRL_RXDMAWU | LEUART_CTRL_TXDMAWU;
+ } else {
+ obj->serial.periph.uart->IFC = USART_IFC_TXC;
+ }
+
+ /* If this is the UART to be used for stdio, copy it to the stdio_uart struct */
+ if(uart_for_stdio) {
+ stdio_uart_inited = 1;
+ memcpy(&stdio_uart, obj, sizeof(serial_t));
+ }
+
+ serial_enable_pins(obj, true);
+ serial_enable(obj, true);
+
+ obj->serial.dmaOptionsTX.dmaChannel = -1;
+ obj->serial.dmaOptionsTX.dmaUsageState = DMA_USAGE_OPPORTUNISTIC;
+
+ obj->serial.dmaOptionsRX.dmaChannel = -1;
+ obj->serial.dmaOptionsRX.dmaUsageState = DMA_USAGE_OPPORTUNISTIC;
+
+}
+
+void serial_free(serial_t *obj)
+{
+ if( LEUART_REF_VALID(obj->serial.periph.leuart) ) {
+ LEUART_Enable(obj->serial.periph.leuart, leuartDisable);
+ } else {
+ USART_Enable(obj->serial.periph.uart, usartDisable);
+ }
+ serial_enable_pins(obj, false);
+}
+
+static void serial_enable(serial_t *obj, uint8_t enable)
+{
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ if (enable) {
+ LEUART_Enable(obj->serial.periph.leuart, leuartEnable);
+ } else {
+ LEUART_Enable(obj->serial.periph.leuart, leuartDisable);
+ }
+ } else {
+ if (enable) {
+ USART_Enable(obj->serial.periph.uart, usartEnable);
+ } else {
+ USART_Enable(obj->serial.periph.uart, usartDisable);
+ }
+ }
+ serial_irq_ids[serial_get_index(obj)] = 0;
+}
+
+/**
+ * Set UART baud rate
+ */
+void serial_baud(serial_t *obj, int baudrate)
+{
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ serial_leuart_baud(obj, baudrate);
+ } else {
+ USART_BaudrateAsyncSet(obj->serial.periph.uart, REFERENCE_FREQUENCY, (uint32_t)baudrate, usartOVS16);
+ }
+}
+
+/**
+ * Set LEUART baud rate
+ * Calculate whether LF or HF clock should be used.
+ */
+static void serial_leuart_baud(serial_t *obj, int baudrate)
+{
+#ifdef LEUART_USING_LFXO
+ /* check if baudrate is within allowed range */
+#if defined(_SILICON_LABS_32B_PLATFORM_2)
+ // P2 has 9 bits + 5 fractional bits in LEUART CLKDIV register
+ MBED_ASSERT(baudrate >= (LEUART_LF_REF_FREQ >> 9));
+#else
+ // P1 has 7 bits + 5 fractional bits in LEUART CLKDIV register
+ MBED_ASSERT(baudrate >= (LEUART_LF_REF_FREQ >> 7));
+#endif
+
+ if(baudrate > (LEUART_LF_REF_FREQ >> 1)){
+ // Baudrate is bigger than LFCLK/2 - we need to use the HF clock
+ uint8_t divisor = 1;
+
+#if defined(_SILICON_LABS_32B_PLATFORM_2)
+ /* Check if baudrate is within allowed range: (HFCLK/4096, HFCLK/2] */
+ MBED_ASSERT((baudrate <= (LEUART_HF_REF_FREQ >> 1)) && (baudrate > (LEUART_HF_REF_FREQ >> 12)));
+
+ CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_HFCLKLE);
+
+ if(baudrate > (LEUART_HF_REF_FREQ >> 9)){
+ divisor = 1;
+ }else if(baudrate > (LEUART_HF_REF_FREQ >> 10)){
+ divisor = 2;
+ }else if(baudrate > (LEUART_HF_REF_FREQ >> 11)){
+ divisor = 4;
+ }else{
+ divisor = 8;
+ }
+#else // P1
+ /* Check if baudrate is within allowed range */
+ MBED_ASSERT((baudrate <= (LEUART_HF_REF_FREQ >> 1)) && (baudrate > (LEUART_HF_REF_FREQ >> 10)));
+
+ CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_CORELEDIV2);
+
+ if(baudrate > (LEUART_HF_REF_FREQ >> 7)){
+ divisor = 1;
+ }else if(baudrate > (LEUART_HF_REF_FREQ >> 8)){
+ divisor = 2;
+ }else if(baudrate > (LEUART_HF_REF_FREQ >> 9)){
+ divisor = 4;
+ }else{
+ divisor = 8;
+ }
+#endif
+ CMU_ClockDivSet(serial_get_clock(obj), divisor);
+ LEUART_BaudrateSet(obj->serial.periph.leuart, LEUART_HF_REF_FREQ/divisor, (uint32_t)baudrate);
+ }else{
+ CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_LFXO);
+ CMU_ClockDivSet(serial_get_clock(obj), 1);
+ LEUART_BaudrateSet(obj->serial.periph.leuart, LEUART_LF_REF_FREQ, (uint32_t)baudrate);
+ }
+#else
+ /* check if baudrate is within allowed range */
+ MBED_ASSERT((baudrate > (LEUART_REF_FREQ >> 10)) && (baudrate <= (LEUART_REF_FREQ >> 1)));
+ uint8_t divisor = 1;
+ if(baudrate > (LEUART_REF_FREQ >> 7)){
+ divisor = 1;
+ }else if(baudrate > (LEUART_REF_FREQ >> 8)){
+ divisor = 2;
+ }else if(baudrate > (LEUART_REF_FREQ >> 9)){
+ divisor = 4;
+ }else{
+ divisor = 8;
+ }
+ CMU_ClockDivSet(serial_get_clock(obj), divisor);
+ LEUART_BaudrateSet(obj->serial.periph.leuart, LEUART_REF_FREQ/divisor, (uint32_t)baudrate);
+#endif
+}
+
+/**
+ * Set UART format by re-initializing the peripheral.
+ */
+void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits)
+{
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ /* Save the serial state */
+ uint8_t was_enabled = LEUART_StatusGet(obj->serial.periph.leuart) & (LEUART_STATUS_TXENS | LEUART_STATUS_RXENS);
+ uint32_t enabled_interrupts = obj->serial.periph.leuart->IEN;
+
+ LEUART_Init_TypeDef init = LEUART_INIT_DEFAULT;
+
+ /* We support 8 data bits ONLY on LEUART*/
+ MBED_ASSERT(data_bits == 8);
+
+ /* Re-init the UART */
+ init.enable = (was_enabled == 0 ? leuartDisable : leuartEnable);
+ init.baudrate = LEUART_BaudrateGet(obj->serial.periph.leuart);
+ if (stop_bits == 2) {
+ init.stopbits = leuartStopbits2;
+ } else {
+ init.stopbits = leuartStopbits1;
+ }
+ switch (parity) {
+ case ParityOdd:
+ case ParityForced0:
+ init.parity = leuartOddParity;
+ break;
+ case ParityEven:
+ case ParityForced1:
+ init.parity = leuartEvenParity;
+ break;
+ default: /* ParityNone */
+ init.parity = leuartNoParity;
+ break;
+ }
+
+ LEUART_Init(obj->serial.periph.leuart, &init);
+
+ /* Re-enable pins for UART at correct location */
+ serial_set_route(obj);
+
+ /* Re-enable interrupts */
+ if(was_enabled != 0) {
+ obj->serial.periph.leuart->IFC = LEUART_IFC_TXC;
+ obj->serial.periph.leuart->IEN = enabled_interrupts;
+ }
+ } else {
+ /* Save the serial state */
+ uint8_t was_enabled = USART_StatusGet(obj->serial.periph.uart) & (USART_STATUS_TXENS | USART_STATUS_RXENS);
+ uint32_t enabled_interrupts = obj->serial.periph.uart->IEN;
+
+
+ USART_InitAsync_TypeDef init = USART_INITASYNC_DEFAULT;
+
+ /* We support 4 to 8 data bits */
+ MBED_ASSERT(data_bits >= 4 && data_bits <= 8);
+
+ /* Re-init the UART */
+ init.enable = (was_enabled == 0 ? usartDisable : usartEnable);
+ init.baudrate = USART_BaudrateGet(obj->serial.periph.uart);
+ init.oversampling = usartOVS16;
+ init.databits = (USART_Databits_TypeDef)((data_bits - 3) << _USART_FRAME_DATABITS_SHIFT);
+ if (stop_bits == 2) {
+ init.stopbits = usartStopbits2;
+ } else {
+ init.stopbits = usartStopbits1;
+ }
+ switch (parity) {
+ case ParityOdd:
+ case ParityForced0:
+ init.parity = usartOddParity;
+ break;
+ case ParityEven:
+ case ParityForced1:
+ init.parity = usartEvenParity;
+ break;
+ default: /* ParityNone */
+ init.parity = usartNoParity;
+ break;
+ }
+
+ USART_InitAsync(obj->serial.periph.uart, &init);
+
+ /* Re-enable pins for UART at correct location */
+ serial_set_route(obj);
+
+ /* Re-enable interrupts */
+ if(was_enabled != 0) {
+ obj->serial.periph.uart->IFC = USART_IFC_TXC;
+ obj->serial.periph.uart->IEN = enabled_interrupts;
+ }
+ }
+}
+
+/******************************************************************************
+ * INTERRUPTS *
+ ******************************************************************************/
+uint8_t serial_tx_ready(serial_t *obj)
+{
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ return (obj->serial.periph.leuart->STATUS & LEUART_STATUS_TXBL) ? true : false;
+ } else {
+ return (obj->serial.periph.uart->STATUS & USART_STATUS_TXBL) ? true : false;
+ }
+}
+
+uint8_t serial_rx_ready(serial_t *obj)
+{
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ return (obj->serial.periph.leuart->STATUS & LEUART_STATUS_RXDATAV) ? true : false;
+ } else {
+ return (obj->serial.periph.uart->STATUS & USART_STATUS_RXDATAV) ? true : false;
+ }
+}
+
+void serial_write_asynch(serial_t *obj, int data)
+{
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ obj->serial.periph.leuart->TXDATA = (uint32_t)data;
+ } else {
+ obj->serial.periph.uart->TXDATA = (uint32_t)data;
+ }
+}
+
+int serial_read_asynch(serial_t *obj)
+{
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ return (int)obj->serial.periph.leuart->RXDATA;
+ } else {
+ return (int)obj->serial.periph.uart->RXDATA;
+ }
+}
+
+uint8_t serial_tx_int_flag(serial_t *obj)
+{
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ return (obj->serial.periph.leuart->IF & LEUART_IF_TXBL) ? true : false;
+ } else {
+ return (obj->serial.periph.uart->IF & USART_IF_TXBL) ? true : false;
+ }
+}
+
+uint8_t serial_rx_int_flag(serial_t *obj)
+{
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ return (obj->serial.periph.leuart->IF & LEUART_IF_RXDATAV) ? true : false;
+ } else {
+ return (obj->serial.periph.uart->IF & USART_IF_RXDATAV) ? true : false;
+ }
+}
+
+void serial_read_asynch_complete(serial_t *obj)
+{
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ obj->serial.periph.leuart->IFC |= LEUART_IFC_RXOF; // in case it got full
+ } else {
+ obj->serial.periph.uart->IFC |= USART_IFC_RXFULL; // in case it got full
+ }
+}
+
+void serial_write_asynch_complete(serial_t *obj)
+{
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ obj->serial.periph.leuart->IFC |= LEUART_IFC_TXC;
+ } else {
+ obj->serial.periph.uart->IFC |= USART_IFC_TXC;
+ }
+}
+
+/** Enable and set the interrupt handler for write (TX)
+ *
+ * @param obj The serial object
+ * @param address The address of TX handler
+ * @param enable Set to non-zero to enable or zero to disable
+ */
+void serial_write_enable_interrupt(serial_t *obj, uint32_t address, uint8_t enable)
+{
+ NVIC_SetVector(serial_get_tx_irq_index(obj), address);
+ serial_irq_set(obj, (SerialIrq)1, enable);
+}
+
+/** Enable and set the interrupt handler for read (RX)
+ *
+ * @param obj The serial object
+ * @param address The address of RX handler
+ * @param enable Set to non-zero to enable or zero to disable
+ */
+void serial_read_enable_interrupt(serial_t *obj, uint32_t address, uint8_t enable)
+{
+ NVIC_SetVector(serial_get_rx_irq_index(obj), address);
+ serial_irq_set(obj, (SerialIrq)0, enable);
+}
+
+uint8_t serial_interrupt_enabled(serial_t *obj)
+{
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ return (obj->serial.periph.leuart->IEN & (LEUART_IEN_RXDATAV | LEUART_IEN_TXBL)) ? true : false;
+ } else {
+ return (obj->serial.periph.uart->IEN & (USART_IEN_RXDATAV | USART_IEN_TXBL)) ? true : false;
+ }
+}
+
+/**
+ * Set handler for all serial interrupts (is probably SerialBase::_handler())
+ * and store IRQ ID to be returned to the handler upon interrupt. ID is
+ * probably a pointer to the calling Serial object.
+ */
+void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id)
+{
+ irq_handler = handler;
+ serial_irq_ids[serial_get_index(obj)] = id;
+}
+
+/**
+ * Generic ISR for all UARTs, both TX and RX
+ */
+static void uart_irq(UARTName name, SerialIrq irq)
+{
+ uint8_t index = serial_pointer_get_index((uint32_t)name);
+ if (serial_irq_ids[index] != 0) {
+ /* Pass interrupt on to mbed common handler */
+ irq_handler(serial_irq_ids[index], irq);
+ /* Clearing interrupt not necessary */
+ }
+}
+
+/**
+ * Set ISR for a given UART and interrupt event (TX or RX)
+ */
+void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable)
+{
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ /* Enable or disable interrupt */
+ if (enable) {
+ if (irq == RxIrq) { /* RX */
+ obj->serial.periph.leuart->IEN |= LEUART_IEN_RXDATAV;
+ NVIC_ClearPendingIRQ(serial_get_rx_irq_index(obj));
+ NVIC_EnableIRQ(serial_get_rx_irq_index(obj));
+ } else { /* TX */
+ obj->serial.periph.leuart->IEN |= LEUART_IEN_TXC;
+ NVIC_ClearPendingIRQ(serial_get_tx_irq_index(obj));
+ NVIC_SetPriority(serial_get_tx_irq_index(obj), 1);
+ NVIC_EnableIRQ(serial_get_tx_irq_index(obj));
+ }
+ } else {
+ if (irq == RxIrq) { /* RX */
+ obj->serial.periph.leuart->IEN &= ~LEUART_IEN_RXDATAV;
+ NVIC_DisableIRQ(serial_get_rx_irq_index(obj));
+ } else { /* TX */
+ obj->serial.periph.leuart->IEN &= ~LEUART_IEN_TXC;
+ NVIC_DisableIRQ(serial_get_tx_irq_index(obj));
+ }
+ }
+ } else {
+ /* Enable or disable interrupt */
+ if (enable) {
+ if (irq == RxIrq) { /* RX */
+ obj->serial.periph.uart->IEN |= USART_IEN_RXDATAV;
+ NVIC_ClearPendingIRQ(serial_get_rx_irq_index(obj));
+ NVIC_EnableIRQ(serial_get_rx_irq_index(obj));
+ } else { /* TX */
+ obj->serial.periph.uart->IEN |= USART_IEN_TXC;
+ NVIC_ClearPendingIRQ(serial_get_tx_irq_index(obj));
+ NVIC_SetPriority(serial_get_tx_irq_index(obj), 1);
+ NVIC_EnableIRQ(serial_get_tx_irq_index(obj));
+ }
+ } else {
+ if (irq == RxIrq) { /* RX */
+ obj->serial.periph.uart->IEN &= ~USART_IEN_RXDATAV;
+ NVIC_DisableIRQ(serial_get_rx_irq_index(obj));
+ } else { /* TX */
+ obj->serial.periph.uart->IEN &= ~USART_IEN_TXC;
+ NVIC_DisableIRQ(serial_get_tx_irq_index(obj));
+ }
+ }
+ }
+}
+
+/******************************************************************************
+ * READ/WRITE *
+ ******************************************************************************/
+
+/**
+ * Get one char from serial link
+ */
+int serial_getc(serial_t *obj)
+{
+ /* Emlib USART_Rx blocks until data is available, so we don't need to use
+ * serial_readable(). Use USART_RxDataGet() to read register directly. */
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ return LEUART_Rx(obj->serial.periph.leuart);
+ } else {
+ return USART_Rx(obj->serial.periph.uart);
+ }
+}
+
+/*
+ * Send one char over serial link
+ */
+void serial_putc(serial_t *obj, int c)
+{
+ /* Emlib USART_Tx blocks until buffer is writable (non-full), so we don't
+ * need to use serial_writable(). */
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ LEUART_Tx(obj->serial.periph.leuart, (uint8_t)(c));
+ while (!(obj->serial.periph.leuart->STATUS & LEUART_STATUS_TXC));
+ } else {
+ USART_Tx(obj->serial.periph.uart, (uint8_t)(c));
+ while (!(obj->serial.periph.uart->STATUS & USART_STATUS_TXC));
+ }
+}
+
+/**
+ * Check if data is available in RX data vector
+ */
+int serial_readable(serial_t *obj)
+{
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ return obj->serial.periph.leuart->STATUS & LEUART_STATUS_RXDATAV;
+ } else {
+ return obj->serial.periph.uart->STATUS & USART_STATUS_RXDATAV;
+ }
+}
+
+/**
+ * Check if TX buffer is empty
+ */
+int serial_writable(serial_t *obj)
+{
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ return obj->serial.periph.leuart->STATUS & LEUART_STATUS_TXBL;
+ } else {
+ return obj->serial.periph.uart->STATUS & USART_STATUS_TXBL;
+ }
+}
+
+/**
+ * Clear UART interrupts
+ */
+void serial_clear(serial_t *obj)
+{
+ /* Interrupts automatically clear when condition is not met anymore */
+}
+
+void serial_break_set(serial_t *obj)
+{
+ /* Send transmission break */
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ obj->serial.periph.leuart->TXDATAX = LEUART_TXDATAX_TXBREAK;
+ } else {
+ obj->serial.periph.uart->TXDATAX = USART_TXDATAX_TXBREAK;
+ }
+}
+
+void serial_break_clear(serial_t *obj)
+{
+ /* No need to clear break, it is automatically cleared after one frame.
+ * From the reference manual:
+ *
+ * By setting TXBREAK, the output will be held low during the stop-bit
+ * period to generate a framing error. A receiver that supports break
+ * detection detects this state, allowing it to be used e.g. for framing
+ * of larger data packets. The line is driven high before the next frame
+ * is transmitted so the next start condition can be identified correctly
+ * by the recipient. Continuous breaks lasting longer than a USART frame
+ * are thus not supported by the USART. GPIO can be used for this.
+ */
+}
+
+void serial_pinout_tx(PinName tx)
+{
+ /* 0x10 sets DOUT high. Prevents false start. */
+ pin_mode(tx, PushPull | 0x10);
+}
+
+/************************************************************************************
+ * DMA helper functions *
+ ************************************************************************************/
+/******************************************
+* static void serial_dmaTransferComplete(uint channel, bool primary, void* user)
+*
+* Callback function which gets called upon DMA transfer completion
+* the user-defined pointer is pointing to the CPP-land thunk
+******************************************/
+static void serial_dmaTransferComplete(unsigned int channel, bool primary, void *user)
+{
+ /* Store information about which channel triggered because CPP doesn't take arguments */
+ serial_dma_irq_fired[channel] = true;
+
+ /* User pointer should be a thunk to CPP land */
+ if (user != NULL) {
+ ((DMACallback)user)();
+ }
+}
+
+#ifndef LDMA_PRESENT
+
+/******************************************
+* static void serial_setupDmaChannel(serial_t *obj, bool tx_nrx)
+*
+* Sets up the DMA configuration block for the assigned channel
+* tx_nrx: true if configuring TX, false if configuring RX.
+******************************************/
+static void serial_dmaSetupChannel(serial_t *obj, bool tx_nrx)
+{
+ DMA_CfgChannel_TypeDef channelConfig;
+
+ if(tx_nrx) {
+ //setup TX channel
+ channelConfig.highPri = false;
+ channelConfig.enableInt = true;
+ channelConfig.cb = &(obj->serial.dmaOptionsTX.dmaCallback);
+
+ switch((uint32_t)(obj->serial.periph.uart)) {
+#ifdef UART0
+ case UART_0:
+ channelConfig.select = DMAREQ_UART0_TXBL;
+ break;
+#endif
+#ifdef UART1
+ case UART_1:
+ channelConfig.select = DMAREQ_UART1_TXBL;
+ break;
+#endif
+#ifdef USART0
+ case USART_0:
+ channelConfig.select = DMAREQ_USART0_TXBL;
+ break;
+#endif
+#ifdef USART1
+ case USART_1:
+ channelConfig.select = DMAREQ_USART1_TXBL;
+ break;
+#endif
+#ifdef USART2
+ case USART_2:
+ channelConfig.select = DMAREQ_USART2_TXBL;
+ break;
+#endif
+#ifdef LEUART0
+ case LEUART_0:
+ channelConfig.select = DMAREQ_LEUART0_TXBL;
+ break;
+#endif
+#ifdef LEUART1
+ case LEUART_1:
+ channelConfig.select = DMAREQ_LEUART1_TXBL;
+ break;
+#endif
+ }
+
+ DMA_CfgChannel(obj->serial.dmaOptionsTX.dmaChannel, &channelConfig);
+ } else {
+ //setup RX channel
+ channelConfig.highPri = true;
+ channelConfig.enableInt = true;
+ channelConfig.cb = &(obj->serial.dmaOptionsRX.dmaCallback);
+
+ switch((uint32_t)(obj->serial.periph.uart)) {
+#ifdef UART0
+ case UART_0:
+ channelConfig.select = DMAREQ_UART0_RXDATAV;
+ break;
+#endif
+#ifdef UART1
+ case UART_1:
+ channelConfig.select = DMAREQ_UART1_RXDATAV;
+ break;
+#endif
+#ifdef USART0
+ case USART_0:
+ channelConfig.select = DMAREQ_USART0_RXDATAV;
+ break;
+#endif
+#ifdef USART1
+ case USART_1:
+ channelConfig.select = DMAREQ_USART1_RXDATAV;
+ break;
+#endif
+#ifdef USART2
+ case USART_2:
+ channelConfig.select = DMAREQ_USART2_RXDATAV;
+ break;
+#endif
+#ifdef LEUART0
+ case LEUART_0:
+ channelConfig.select = DMAREQ_LEUART0_RXDATAV;
+ break;
+#endif
+#ifdef LEUART1
+ case LEUART_1:
+ channelConfig.select = DMAREQ_LEUART1_RXDATAV;
+ break;
+#endif
+ }
+
+ DMA_CfgChannel(obj->serial.dmaOptionsRX.dmaChannel, &channelConfig);
+ }
+}
+
+#endif /* LDMA_PRESENT */
+
+/******************************************
+* static void serial_dmaTrySetState(DMA_OPTIONS_t *obj, DMAUsage requestedState)
+*
+* Tries to set the passed DMA state to the requested state.
+*
+* requested state possibilities:
+* * NEVER:
+* if the previous state was always, will deallocate the channel
+* * OPPORTUNISTIC:
+* If the previous state was always, will reuse that channel but free upon next completion.
+* If not, will try to acquire a channel.
+* When allocated, state changes to DMA_USAGE_TEMPORARY_ALLOCATED.
+* * ALWAYS:
+* Will try to allocate a channel and keep it.
+* If succesfully allocated, state changes to DMA_USAGE_ALLOCATED.
+******************************************/
+static void serial_dmaTrySetState(DMA_OPTIONS_t *obj, DMAUsage requestedState, serial_t *serialPtr, bool tx_nrx)
+{
+ DMAUsage currentState = obj->dmaUsageState;
+ int tempDMAChannel = -1;
+
+ if ((requestedState == DMA_USAGE_ALWAYS) && (currentState != DMA_USAGE_ALLOCATED)) {
+ /* Try to allocate channel */
+ tempDMAChannel = dma_channel_allocate(DMA_CAP_NONE);
+ if(tempDMAChannel >= 0) {
+ obj->dmaChannel = tempDMAChannel;
+ obj->dmaUsageState = DMA_USAGE_ALLOCATED;
+ dma_init();
+ serial_dmaSetupChannel(serialPtr, tx_nrx);
+ }
+ } else if (requestedState == DMA_USAGE_OPPORTUNISTIC) {
+ if (currentState == DMA_USAGE_ALLOCATED) {
+ /* Channels have already been allocated previously by an ALWAYS state, so after this transfer, we will release them */
+ obj->dmaUsageState = DMA_USAGE_TEMPORARY_ALLOCATED;
+ } else {
+ /* Try to allocate channel */
+ tempDMAChannel = dma_channel_allocate(DMA_CAP_NONE);
+ if(tempDMAChannel >= 0) {
+ obj->dmaChannel = tempDMAChannel;
+ obj->dmaUsageState = DMA_USAGE_TEMPORARY_ALLOCATED;
+ dma_init();
+ serial_dmaSetupChannel(serialPtr, tx_nrx);
+ }
+ }
+ } else if (requestedState == DMA_USAGE_NEVER) {
+ /* If channel is allocated, get rid of it */
+ dma_channel_free(obj->dmaChannel);
+ obj->dmaChannel = -1;
+ obj->dmaUsageState = DMA_USAGE_NEVER;
+ }
+}
+
+#ifndef LDMA_PRESENT
+
+static void serial_dmaActivate(serial_t *obj, void* cb, void* buffer, int length, bool tx_nrx)
+{
+ DMA_CfgDescr_TypeDef channelConfig;
+
+ if(tx_nrx) {
+ // Set DMA callback
+ obj->serial.dmaOptionsTX.dmaCallback.cbFunc = serial_dmaTransferComplete;
+ obj->serial.dmaOptionsTX.dmaCallback.userPtr = NULL;
+
+ // Set up configuration structure
+ channelConfig.dstInc = dmaDataIncNone;
+ channelConfig.srcInc = dmaDataInc1;
+ channelConfig.size = dmaDataSize1;
+ channelConfig.arbRate = dmaArbitrate1;
+ channelConfig.hprot = 0;
+
+ // Clear TXC
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ LEUART_IntClear(obj->serial.periph.leuart, LEUART_IFC_TXC);
+ } else {
+ USART_IntClear(obj->serial.periph.uart, USART_IFC_TXC);
+ }
+
+ // Set callback and enable TXC. This will fire once the
+ // serial transfer finishes
+ NVIC_SetVector(serial_get_tx_irq_index(obj), (uint32_t)cb);
+ serial_irq_set(obj, TxIrq, true);
+
+ DMA_CfgDescr(obj->serial.dmaOptionsTX.dmaChannel, true, &channelConfig);
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ // Activate TX and clear TX buffer (note that clear must be done
+ // separately and before TXEN or DMA will die on some platforms)
+ obj->serial.periph.leuart->CMD = LEUART_CMD_CLEARTX;
+ obj->serial.periph.leuart->CMD = LEUART_CMD_TXEN;
+ while(obj->serial.periph.leuart->SYNCBUSY & LEUART_SYNCBUSY_CMD);
+
+ // Kick off TX DMA
+ DMA_ActivateBasic(obj->serial.dmaOptionsTX.dmaChannel, true, false, (void*) &(obj->serial.periph.leuart->TXDATA), buffer, length - 1);
+ } else {
+ // Activate TX amd clear TX buffer
+ obj->serial.periph.uart->CMD = USART_CMD_TXEN | USART_CMD_CLEARTX;
+
+ // Kick off TX DMA
+ DMA_ActivateBasic(obj->serial.dmaOptionsTX.dmaChannel, true, false, (void*) &(obj->serial.periph.uart->TXDATA), buffer, length - 1);
+ }
+
+
+ } else {
+ // Set DMA callback
+ obj->serial.dmaOptionsRX.dmaCallback.cbFunc = serial_dmaTransferComplete;
+ obj->serial.dmaOptionsRX.dmaCallback.userPtr = cb;
+
+ // Set up configuration structure
+ channelConfig.dstInc = dmaDataInc1;
+ channelConfig.srcInc = dmaDataIncNone;
+ channelConfig.size = dmaDataSize1;
+ channelConfig.arbRate = dmaArbitrate1;
+ channelConfig.hprot = 0;
+
+ DMA_CfgDescr(obj->serial.dmaOptionsRX.dmaChannel, true, &channelConfig);
+
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ // Activate RX and clear RX buffer
+ obj->serial.periph.leuart->CMD = LEUART_CMD_CLEARRX;
+ obj->serial.periph.leuart->CMD = LEUART_CMD_RXEN;
+ while(obj->serial.periph.leuart->SYNCBUSY & LEUART_SYNCBUSY_CMD);
+
+ // Kick off RX DMA
+ DMA_ActivateBasic(obj->serial.dmaOptionsRX.dmaChannel, true, false, buffer, (void*) &(obj->serial.periph.leuart->RXDATA), length - 1);
+ } else {
+ // Activate RX and clear RX buffer
+ obj->serial.periph.uart->CMD = USART_CMD_RXEN | USART_CMD_CLEARRX;
+
+ // Kick off RX DMA
+ DMA_ActivateBasic(obj->serial.dmaOptionsRX.dmaChannel, true, false, buffer, (void*) &(obj->serial.periph.uart->RXDATA), length - 1);
+ }
+ }
+}
+
+#endif
+
+
+#ifdef LDMA_PRESENT
+
+static void serial_dmaSetupChannel(serial_t *obj, bool tx_nrx)
+{
+}
+
+static void serial_dmaActivate(serial_t *obj, void* cb, void* buffer, int length, bool tx_nrx)
+{
+ LDMA_PeripheralSignal_t dma_periph;
+
+ obj->serial.dmaOptionsRX.dmaCallback.userPtr = cb;
+
+ if( tx_nrx ) {
+ volatile void *target_addr;
+
+ // Clear TXC
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ LEUART_IntClear(obj->serial.periph.leuart, LEUART_IFC_TXC);
+ } else {
+ USART_IntClear(obj->serial.periph.uart, USART_IFC_TXC);
+ }
+
+ switch((uint32_t)(obj->serial.periph.uart)) {
+#ifdef USART0
+ case USART_0:
+ dma_periph = ldmaPeripheralSignal_USART0_TXBL;
+ target_addr = &USART0->TXDATA;
+ obj->serial.periph.uart->CMD = USART_CMD_TXEN | USART_CMD_CLEARTX;
+ break;
+#endif
+#ifdef USART1
+ case USART_1:
+ dma_periph = ldmaPeripheralSignal_USART1_TXBL;
+ target_addr = &USART1->TXDATA;
+ obj->serial.periph.uart->CMD = USART_CMD_TXEN | USART_CMD_CLEARTX;
+ break;
+#endif
+#ifdef LEUART0
+ case LEUART_0:
+ dma_periph = ldmaPeripheralSignal_LEUART0_TXBL;
+ target_addr = &LEUART0->TXDATA;
+ obj->serial.periph.leuart->CMD = LEUART_CMD_CLEARTX;
+ obj->serial.periph.leuart->CMD = LEUART_CMD_TXEN;
+ while(obj->serial.periph.leuart->SYNCBUSY & LEUART_SYNCBUSY_CMD);
+ break;
+#endif
+ default:
+ MBED_ASSERT(0);
+ while(1);
+ break;
+ }
+
+ // Set callback and enable TXC. This will fire once the
+ // serial transfer finishes
+ NVIC_SetVector(serial_get_tx_irq_index(obj), (uint32_t)cb);
+ serial_irq_set(obj, TxIrq, true);
+
+ // Start DMA transfer
+ LDMA_TransferCfg_t xferConf = LDMA_TRANSFER_CFG_PERIPHERAL(dma_periph);
+ LDMA_Descriptor_t desc = LDMA_DESCRIPTOR_SINGLE_M2P_BYTE(buffer, target_addr, length);
+ LDMAx_StartTransfer(obj->serial.dmaOptionsTX.dmaChannel, &xferConf, &desc, serial_dmaTransferComplete, NULL);
+
+ } else {
+ volatile const void *source_addr;
+
+ switch((uint32_t)(obj->serial.periph.uart)) {
+#ifdef USART0
+ case USART_0:
+ dma_periph = ldmaPeripheralSignal_USART0_RXDATAV;
+ source_addr = &USART0->RXDATA;
+ obj->serial.periph.uart->CMD = USART_CMD_RXEN | USART_CMD_CLEARRX;
+ break;
+#endif
+#ifdef USART1
+ case USART_1:
+ dma_periph = ldmaPeripheralSignal_USART1_RXDATAV;
+ source_addr = &USART1->RXDATA;
+ obj->serial.periph.uart->CMD = USART_CMD_RXEN | USART_CMD_CLEARRX;
+ break;
+#endif
+#ifdef LEUART0
+ case LEUART_0:
+ dma_periph = ldmaPeripheralSignal_LEUART0_RXDATAV;
+ source_addr = &LEUART0->RXDATA;
+ obj->serial.periph.leuart->CMD = LEUART_CMD_CLEARRX;
+ obj->serial.periph.leuart->CMD = LEUART_CMD_RXEN;
+ while(obj->serial.periph.leuart->SYNCBUSY & LEUART_SYNCBUSY_CMD);
+ break;
+#endif
+ default:
+ MBED_ASSERT(0);
+ while(1);
+ break;
+ }
+
+ LDMA_TransferCfg_t xferConf = LDMA_TRANSFER_CFG_PERIPHERAL(dma_periph);
+ LDMA_Descriptor_t desc = LDMA_DESCRIPTOR_SINGLE_P2M_BYTE(source_addr, buffer, length);
+ LDMAx_StartTransfer(obj->serial.dmaOptionsRX.dmaChannel, &xferConf, &desc, serial_dmaTransferComplete, cb);
+ }
+}
+
+#endif /* LDMA_PRESENT */
+
+/************************************************************************************
+ * ASYNCHRONOUS HAL *
+ ************************************************************************************/
+
+#if DEVICE_SERIAL_ASYNCH
+
+/************************************
+ * HELPER FUNCTIONS *
+ ***********************************/
+
+/** Configure TX events
+ *
+ * @param obj The serial object
+ * @param event The logical OR of the TX events to configure
+ * @param enable Set to non-zero to enable events, or zero to disable them
+ */
+void serial_tx_enable_event(serial_t *obj, int event, uint8_t enable)
+{
+ // Shouldn't have to enable TX interrupt here, just need to keep track of the requested events.
+ if(enable) obj->serial.events |= event;
+ else obj->serial.events &= ~event;
+}
+
+/**
+ * @param obj The serial object.
+ * @param event The logical OR of the RX events to configure
+ * @param enable Set to non-zero to enable events, or zero to disable them
+ */
+void serial_rx_enable_event(serial_t *obj, int event, uint8_t enable)
+{
+ if(enable) {
+ obj->serial.events |= event;
+ } else {
+ obj->serial.events &= ~event;
+ }
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ if(event & SERIAL_EVENT_RX_FRAMING_ERROR) {
+ //FERR interrupt source
+ if(enable) obj->serial.periph.leuart->IEN |= LEUART_IEN_FERR;
+ else obj->serial.periph.leuart->IEN &= ~LEUART_IEN_FERR;
+ }
+ if(event & SERIAL_EVENT_RX_PARITY_ERROR) {
+ //PERR interrupt source
+ if(enable) obj->serial.periph.leuart->IEN |= LEUART_IEN_PERR;
+ else obj->serial.periph.leuart->IEN &= ~LEUART_IEN_PERR;
+ }
+ if(event & SERIAL_EVENT_RX_OVERFLOW) {
+ //RXOF interrupt source
+ if(enable) obj->serial.periph.leuart->IEN |= LEUART_IEN_RXOF;
+ else obj->serial.periph.leuart->IEN &= ~LEUART_IEN_RXOF;
+ }
+ } else {
+ if(event & SERIAL_EVENT_RX_FRAMING_ERROR) {
+ //FERR interrupt source
+ if(enable) obj->serial.periph.uart->IEN |= USART_IEN_FERR;
+ else obj->serial.periph.uart->IEN &= ~USART_IEN_FERR;
+ }
+ if(event & SERIAL_EVENT_RX_PARITY_ERROR) {
+ //PERR interrupt source
+ if(enable) obj->serial.periph.uart->IEN |= USART_IEN_PERR;
+ else obj->serial.periph.uart->IEN &= ~USART_IEN_PERR;
+ }
+ if(event & SERIAL_EVENT_RX_OVERFLOW) {
+ //RXOF interrupt source
+ if(enable) obj->serial.periph.uart->IEN |= USART_IEN_RXOF;
+ else obj->serial.periph.uart->IEN &= ~USART_IEN_RXOF;
+ }
+ }
+}
+
+/** Configure the TX buffer for an asynchronous write serial transaction
+ *
+ * @param obj The serial object.
+ * @param tx The buffer for sending.
+ * @param tx_length The number of words to transmit.
+ */
+void serial_tx_buffer_set(serial_t *obj, void *tx, int tx_length, uint8_t width)
+{
+ // We only support byte buffers for now
+ MBED_ASSERT(width == 8);
+
+ if(serial_tx_active(obj)) return;
+
+ obj->tx_buff.buffer = tx;
+ obj->tx_buff.length = tx_length;
+ obj->tx_buff.pos = 0;
+
+ return;
+}
+
+/** Configure the TX buffer for an asynchronous read serial transaction
+ *
+ * @param obj The serial object.
+ * @param rx The buffer for receiving.
+ * @param rx_length The number of words to read.
+ */
+void serial_rx_buffer_set(serial_t *obj, void *rx, int rx_length, uint8_t width)
+{
+ // We only support byte buffers for now
+ MBED_ASSERT(width == 8);
+
+ if(serial_rx_active(obj)) return;
+
+ obj->rx_buff.buffer = rx;
+ obj->rx_buff.length = rx_length;
+ obj->rx_buff.pos = 0;
+
+ return;
+}
+
+/************************************
+ * TRANSFER FUNCTIONS *
+ ***********************************/
+
+/** Begin asynchronous TX transfer. The used buffer is specified in the serial object,
+ * tx_buff
+ *
+ * @param obj The serial object
+ * @param cb The function to call when an event occurs
+ * @param hint A suggestion for how to use DMA with this transfer
+ * @return Returns number of data transfered, or 0 otherwise
+ */
+int serial_tx_asynch(serial_t *obj, const void *tx, size_t tx_length, uint8_t tx_width, uint32_t handler, uint32_t event, DMAUsage hint)
+{
+ // Check that a buffer has indeed been set up
+ MBED_ASSERT(tx != (void*)0);
+ if(tx_length == 0) return 0;
+
+ // Set up buffer
+ serial_tx_buffer_set(obj, (void *)tx, tx_length, tx_width);
+
+ // Set up events
+ serial_tx_enable_event(obj, SERIAL_EVENT_TX_ALL, false);
+ serial_tx_enable_event(obj, event, true);
+
+ // Set up sleepmode
+ serial_block_sleep(obj);
+
+ // Determine DMA strategy
+ serial_dmaTrySetState(&(obj->serial.dmaOptionsTX), hint, obj, true);
+
+ // If DMA, kick off DMA transfer
+ if(obj->serial.dmaOptionsTX.dmaChannel >= 0) {
+ serial_dmaActivate(obj, (void*)handler, obj->tx_buff.buffer, obj->tx_buff.length, true);
+ }
+ // Else, activate interrupt. TXBL will take care of buffer filling through ISR.
+ else {
+ // Store callback
+ NVIC_ClearPendingIRQ(serial_get_tx_irq_index(obj));
+ NVIC_DisableIRQ(serial_get_tx_irq_index(obj));
+ NVIC_SetPriority(serial_get_tx_irq_index(obj), 1);
+ NVIC_SetVector(serial_get_tx_irq_index(obj), (uint32_t)handler);
+ NVIC_EnableIRQ(serial_get_tx_irq_index(obj));
+
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ // Activate TX and clear TX buffer
+ obj->serial.periph.leuart->CMD = LEUART_CMD_CLEARTX;
+ obj->serial.periph.leuart->CMD = LEUART_CMD_TXEN;
+ while(obj->serial.periph.leuart->SYNCBUSY & LEUART_SYNCBUSY_CMD);
+
+ // Enable interrupt
+ LEUART_IntEnable(obj->serial.periph.leuart, LEUART_IEN_TXBL);
+ } else {
+ // Activate TX and clear TX buffer
+ obj->serial.periph.uart->CMD = USART_CMD_TXEN | USART_CMD_CLEARTX;
+
+ // Enable interrupt
+ USART_IntEnable(obj->serial.periph.uart, USART_IEN_TXBL);
+ }
+ }
+
+ return 0;
+}
+
+/** Begin asynchronous RX transfer (enable interrupt for data collecting)
+ * The used buffer is specified in the serial object - rx_buff
+ *
+ * @param obj The serial object
+ * @param cb The function to call when an event occurs
+ * @param hint A suggestion for how to use DMA with this transfer
+ */
+void serial_rx_asynch(serial_t *obj, void *rx, size_t rx_length, uint8_t rx_width, uint32_t handler, uint32_t event, uint8_t char_match, DMAUsage hint)
+{
+ // Check that a buffer has indeed been set up
+ MBED_ASSERT(rx != (void*)0);
+ if(rx_length == 0) return;
+
+ // Set up buffer
+ serial_rx_buffer_set(obj,(void*) rx, rx_length, rx_width);
+
+ //disable character match if no character is specified
+ if(char_match == SERIAL_RESERVED_CHAR_MATCH){
+ event &= ~SERIAL_EVENT_RX_CHARACTER_MATCH;
+ }
+
+ /*clear all set interrupts*/
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ LEUART_IntClear(obj->serial.periph.leuart, LEUART_IFC_PERR | LEUART_IFC_FERR | LEUART_IFC_RXOF);
+ }else{
+ USART_IntClear(obj->serial.periph.uart, USART_IFC_PERR | USART_IFC_FERR | USART_IFC_RXOF);
+ }
+
+ // Set up events
+ serial_rx_enable_event(obj, SERIAL_EVENT_RX_ALL, false);
+ serial_rx_enable_event(obj, event, true);
+ obj->char_match = char_match;
+
+ // Set up sleepmode
+ serial_block_sleep(obj);
+
+ // Determine DMA strategy
+ // If character match is enabled, we can't use DMA, sadly. We could when using LEUART though, but that support is not in here yet.
+ // TODO: add DMA support for character matching with leuart
+ if(!(event & SERIAL_EVENT_RX_CHARACTER_MATCH)) {
+ serial_dmaTrySetState(&(obj->serial.dmaOptionsRX), hint, obj, false);
+ }else{
+ serial_dmaTrySetState(&(obj->serial.dmaOptionsRX), DMA_USAGE_NEVER, obj, false);
+ }
+
+ // If DMA, kick off DMA
+ if(obj->serial.dmaOptionsRX.dmaChannel >= 0) {
+ serial_dmaActivate(obj, (void*)handler, obj->rx_buff.buffer, obj->rx_buff.length, false);
+ }
+ // Else, activate interrupt. RXDATAV is responsible for incoming data notification.
+ else {
+ // Store callback
+ NVIC_ClearPendingIRQ(serial_get_rx_irq_index(obj));
+ NVIC_SetVector(serial_get_rx_irq_index(obj), (uint32_t)handler);
+ NVIC_EnableIRQ(serial_get_rx_irq_index(obj));
+
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ // Activate RX and clear RX buffer
+ obj->serial.periph.leuart->CMD = LEUART_CMD_CLEARRX;
+ obj->serial.periph.leuart->CMD = LEUART_CMD_RXEN;
+ while(obj->serial.periph.leuart->SYNCBUSY & LEUART_SYNCBUSY_CMD);
+
+ // Enable interrupt
+ LEUART_IntEnable(obj->serial.periph.leuart, LEUART_IEN_RXDATAV);
+ } else {
+ // Activate RX and clear RX buffer
+ obj->serial.periph.uart->CMD = USART_CMD_RXEN | USART_CMD_CLEARRX;
+
+ // Clear RXFULL
+ USART_IntClear(obj->serial.periph.uart, USART_IFC_RXFULL);
+
+ // Enable interrupt
+ USART_IntEnable(obj->serial.periph.uart, USART_IEN_RXDATAV);
+ }
+ }
+
+ return;
+}
+
+/** Attempts to determine if the serial peripheral is already in use for TX
+ *
+ * @param obj The serial object
+ * @return Non-zero if the TX transaction is ongoing, 0 otherwise
+ */
+uint8_t serial_tx_active(serial_t *obj)
+{
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ return (obj->serial.periph.leuart->IEN & (LEUART_IEN_TXBL|LEUART_IEN_TXC)) ? true : false;
+ } else {
+ return (obj->serial.periph.uart->IEN & (USART_IEN_TXBL|USART_IEN_TXC)) ? true : false;
+ }
+}
+
+/** Attempts to determine if the serial peripheral is already in use for RX
+ *
+ * @param obj The serial object
+ * @return Non-zero if the RX transaction is ongoing, 0 otherwise
+ */
+uint8_t serial_rx_active(serial_t *obj)
+{
+ switch(obj->serial.dmaOptionsRX.dmaUsageState) {
+ case DMA_USAGE_TEMPORARY_ALLOCATED:
+ /* Temporary allocation always means its active, as this state gets cleared afterwards */
+ return 1;
+ case DMA_USAGE_ALLOCATED:
+ /* Check whether the allocated DMA channel is active by checking the DMA transfer */
+#ifndef LDMA_PRESENT
+ return DMA_ChannelEnabled(obj->serial.dmaOptionsRX.dmaChannel);
+#else
+ // LDMA_TransferDone does not work since the CHDONE bits get cleared,
+ // so just check if the channel is enabled
+ return LDMA->CHEN & (1 << obj->serial.dmaOptionsRX.dmaChannel);
+#endif
+ default:
+ /* Check whether interrupt for serial TX is enabled */
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ return (obj->serial.periph.leuart->IEN & (LEUART_IEN_RXDATAV)) ? true : false;
+ } else {
+ return (obj->serial.periph.uart->IEN & (USART_IEN_RXDATAV)) ? true : false;
+ }
+ }
+}
+
+/** The asynchronous TX handler. Writes to the TX FIFO and checks for events.
+ * If any TX event has occured, the TX abort function is called.
+ *
+ * @param obj The serial object
+ * @return Returns event flags if a TX transfer termination condition was met or 0 otherwise
+ */
+int serial_tx_irq_handler_asynch(serial_t *obj)
+{
+ /* This interrupt handler is called from USART irq */
+ uint8_t *buf = obj->tx_buff.buffer;
+
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ if(obj->serial.periph.leuart->IEN & LEUART_IEN_TXBL){
+ /* There is still data to send */
+ while((LEUART_StatusGet(obj->serial.periph.leuart) & LEUART_STATUS_TXBL) && (obj->tx_buff.pos <= (obj->tx_buff.length - 1))) {
+ while (obj->serial.periph.leuart->SYNCBUSY);
+ LEUART_Tx(obj->serial.periph.leuart, buf[obj->tx_buff.pos]);
+ obj->tx_buff.pos++;
+ }
+ if(obj->tx_buff.pos >= obj->tx_buff.length){
+ /* Last byte has been put in TX, set up TXC interrupt */
+ LEUART_IntDisable(obj->serial.periph.leuart, LEUART_IEN_TXBL);
+ LEUART_IntEnable(obj->serial.periph.leuart, LEUART_IEN_TXC);
+ while (obj->serial.periph.leuart->SYNCBUSY);
+ }
+ }else if (obj->serial.periph.leuart->IF & LEUART_IF_TXC){
+ /* Last byte has been successfully transmitted. Stop the procedure */
+ serial_tx_abort_asynch_intern(obj, 1);
+ return SERIAL_EVENT_TX_COMPLETE & obj->serial.events;
+ }
+ } else {
+ if(obj->serial.periph.uart->IEN & USART_IEN_TXBL){
+ /* There is still data to send */
+ while((USART_StatusGet(obj->serial.periph.uart) & USART_STATUS_TXBL) && (obj->tx_buff.pos <= (obj->tx_buff.length - 1))) {
+ USART_Tx(obj->serial.periph.uart, buf[obj->tx_buff.pos]);
+ obj->tx_buff.pos++;
+ }
+ if(obj->tx_buff.pos >= obj->tx_buff.length){
+ /* Last byte has been put in TX, set up TXC interrupt */
+ USART_IntDisable(obj->serial.periph.uart, USART_IEN_TXBL);
+ USART_IntEnable(obj->serial.periph.uart, USART_IEN_TXC);
+ }
+ } else if (obj->serial.periph.uart->IF & USART_IF_TXC) {
+ /* Last byte has been successfully transmitted. Stop the procedure */
+ serial_tx_abort_asynch_intern(obj, 1);
+ return SERIAL_EVENT_TX_COMPLETE & obj->serial.events;
+ }
+ }
+ return 0;
+}
+
+/** The asynchronous RX handler. Reads from the RX FIFOF and checks for events.
+ * If any RX event has occured, the RX abort function is called.
+ *
+ * @param obj The serial object
+ * @return Returns event flags if a RX transfer termination condition was met or 0 otherwise
+ */
+int serial_rx_irq_handler_asynch(serial_t *obj)
+{
+ int event = 0;
+
+ /* This interrupt handler is called from USART irq */
+ uint8_t *buf = (uint8_t*)obj->rx_buff.buffer;
+
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ /* Determine the source of the interrupt */
+ if(LEUART_IntGetEnabled(obj->serial.periph.leuart) & LEUART_IF_PERR) {
+ /* Parity error has occurred, and we are notifying. */
+ LEUART_IntClear(obj->serial.periph.leuart, LEUART_IFC_PERR);
+ serial_rx_abort_asynch_intern(obj, 1);
+ return SERIAL_EVENT_RX_PARITY_ERROR;
+ }
+
+ if(LEUART_IntGetEnabled(obj->serial.periph.leuart) & LEUART_IF_FERR) {
+ /* Framing error has occurred, and we are notifying */
+ LEUART_IntClear(obj->serial.periph.leuart, LEUART_IFC_FERR);
+ serial_rx_abort_asynch_intern(obj, 1);
+ return SERIAL_EVENT_RX_FRAMING_ERROR;
+ }
+
+ if(LEUART_IntGetEnabled(obj->serial.periph.leuart) & LEUART_IF_RXOF) {
+ /* RX buffer overflow has occurred, and we are notifying */
+ LEUART_IntClear(obj->serial.periph.leuart, LEUART_IFC_RXOF);
+ serial_rx_abort_asynch_intern(obj, 1);
+ return SERIAL_EVENT_RX_OVERFLOW;
+ }
+
+ if((LEUART_IntGetEnabled(obj->serial.periph.leuart) & LEUART_IF_RXDATAV) || (LEUART_StatusGet(obj->serial.periph.leuart) & LEUART_STATUS_RXDATAV)) {
+ /* Valid data in buffer. Determine course of action: continue receiving or interrupt */
+ if(obj->rx_buff.pos >= (obj->rx_buff.length - 1)) {
+ /* Last char, transfer complete. Switch off interrupt and return event. */
+ buf[obj->rx_buff.pos] = LEUART_RxDataGet(obj->serial.periph.leuart);
+
+ event |= SERIAL_EVENT_RX_COMPLETE;
+
+ if((buf[obj->rx_buff.pos] == obj->char_match) && (obj->serial.events & SERIAL_EVENT_RX_CHARACTER_MATCH)) event |= SERIAL_EVENT_RX_CHARACTER_MATCH;
+
+ serial_rx_abort_asynch_intern(obj, 1);
+ return event & obj->serial.events;
+ } else {
+ /* There's still space in the receive buffer */
+ while((LEUART_StatusGet(obj->serial.periph.leuart) & LEUART_STATUS_RXDATAV) && (obj->rx_buff.pos <= (obj->rx_buff.length - 1))) {
+ bool aborting = false;
+ buf[obj->rx_buff.pos] = LEUART_RxDataGet(obj->serial.periph.leuart);
+ obj->rx_buff.pos++;
+
+ /* Check for character match event */
+ if((buf[obj->rx_buff.pos - 1] == obj->char_match) && (obj->serial.events & SERIAL_EVENT_RX_CHARACTER_MATCH)) {
+ aborting = true;
+ event |= SERIAL_EVENT_RX_CHARACTER_MATCH;
+ }
+
+ /* Check for final char event */
+ if(obj->rx_buff.pos >= (obj->rx_buff.length)) {
+ aborting = true;
+ event |= SERIAL_EVENT_RX_COMPLETE & obj->serial.events;
+ }
+
+ if(aborting) {
+ serial_rx_abort_asynch_intern(obj, 1);
+ return event & obj->serial.events;
+ }
+ }
+ }
+ }
+ } else {
+ /* Determine the source of the interrupt */
+ if(USART_IntGetEnabled(obj->serial.periph.uart) & USART_IF_PERR) {
+ /* Parity error has occurred, and we are notifying. */
+ USART_IntClear(obj->serial.periph.uart, USART_IFC_PERR);
+ serial_rx_abort_asynch_intern(obj, 1);
+ return SERIAL_EVENT_RX_PARITY_ERROR;
+ }
+
+ if(USART_IntGetEnabled(obj->serial.periph.uart) & USART_IF_FERR) {
+ /* Framing error has occurred, and we are notifying */
+ USART_IntClear(obj->serial.periph.uart, USART_IFC_FERR);
+ serial_rx_abort_asynch_intern(obj, 1);
+ return SERIAL_EVENT_RX_FRAMING_ERROR;
+ }
+
+ if(USART_IntGetEnabled(obj->serial.periph.uart) & USART_IF_RXOF) {
+ /* RX buffer overflow has occurred, and we are notifying */
+ USART_IntClear(obj->serial.periph.uart, USART_IFC_RXOF);
+ serial_rx_abort_asynch_intern(obj, 1);
+ return SERIAL_EVENT_RX_OVERFLOW;
+ }
+
+ if((USART_IntGetEnabled(obj->serial.periph.uart) & USART_IF_RXDATAV) || (USART_StatusGet(obj->serial.periph.uart) & USART_STATUS_RXFULL)) {
+ /* Valid data in buffer. Determine course of action: continue receiving or interrupt */
+ if(obj->rx_buff.pos >= (obj->rx_buff.length - 1)) {
+ /* Last char, transfer complete. Switch off interrupt and return event. */
+ buf[obj->rx_buff.pos] = USART_RxDataGet(obj->serial.periph.uart);
+
+ event |= SERIAL_EVENT_RX_COMPLETE;
+
+ if((buf[obj->rx_buff.pos] == obj->char_match) && (obj->serial.events & SERIAL_EVENT_RX_CHARACTER_MATCH)) event |= SERIAL_EVENT_RX_CHARACTER_MATCH;
+
+ serial_rx_abort_asynch_intern(obj, 1);
+ return event & obj->serial.events;
+ } else {
+ /* There's still space in the receive buffer */
+ while(((USART_StatusGet(obj->serial.periph.uart) & USART_STATUS_RXDATAV) || (USART_StatusGet(obj->serial.periph.uart) & USART_IF_RXFULL)) && (obj->rx_buff.pos <= (obj->rx_buff.length - 1))) {
+ bool aborting = false;
+ buf[obj->rx_buff.pos] = USART_RxDataGet(obj->serial.periph.uart);
+ obj->rx_buff.pos++;
+
+ /* Check for character match event */
+ if((buf[obj->rx_buff.pos - 1] == obj->char_match) && (obj->serial.events & SERIAL_EVENT_RX_CHARACTER_MATCH)) {
+ aborting = true;
+ event |= SERIAL_EVENT_RX_CHARACTER_MATCH;
+ }
+
+ /* Check for final char event */
+ if(obj->rx_buff.pos >= (obj->rx_buff.length)) {
+ aborting = true;
+ event |= SERIAL_EVENT_RX_COMPLETE & obj->serial.events;
+ }
+
+ if(aborting) {
+ serial_rx_abort_asynch_intern(obj, 1);
+ return event & obj->serial.events;
+ }
+ }
+ }
+ }
+ }
+
+ /* All events should have generated a return, if no return has happened, no event has been caught */
+ return 0;
+}
+
+/** Unified IRQ handler. Determines the appropriate handler to execute and returns the flags.
+ *
+ * WARNING: this code should be stateless, as re-entrancy is very possible in interrupt-based mode.
+ */
+int serial_irq_handler_asynch(serial_t *obj)
+{
+ uint32_t txc_int;
+
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ txc_int = LEUART_IntGetEnabled(obj->serial.periph.leuart) & LEUART_IF_TXC;
+ } else {
+ txc_int = USART_IntGetEnabled(obj->serial.periph.uart) & USART_IF_TXC;
+ }
+
+ /* First, check if we're running in DMA mode */
+ if( (obj->serial.dmaOptionsRX.dmaChannel != -1) &&
+ serial_dma_irq_fired[obj->serial.dmaOptionsRX.dmaChannel]) {
+ /* Clean up */
+ serial_dma_irq_fired[obj->serial.dmaOptionsRX.dmaChannel] = false;
+ serial_rx_abort_asynch_intern(obj, 1);
+
+ /* Notify CPP land of RX completion */
+ return SERIAL_EVENT_RX_COMPLETE & obj->serial.events;
+ } else if (txc_int && (obj->serial.dmaOptionsTX.dmaChannel != -1) &&
+ serial_dma_irq_fired[obj->serial.dmaOptionsTX.dmaChannel]) {
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ /* Clean up */
+ serial_dma_irq_fired[obj->serial.dmaOptionsTX.dmaChannel] = false;
+ serial_tx_abort_asynch_intern(obj, 1);
+ /* Notify CPP land of completion */
+ return SERIAL_EVENT_TX_COMPLETE & obj->serial.events;
+ }else{
+ /* Clean up */
+ serial_dma_irq_fired[obj->serial.dmaOptionsTX.dmaChannel] = false;
+ serial_tx_abort_asynch_intern(obj, 1);
+ /* Notify CPP land of completion */
+ return SERIAL_EVENT_TX_COMPLETE & obj->serial.events;
+ }
+ } else {
+ /* Check the NVIC to see which interrupt we're running from
+ * Also make sure to prioritize RX */
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ //Different method of checking tx vs rx for LEUART
+ if(LEUART_IntGetEnabled(obj->serial.periph.leuart) & (LEUART_IF_RXDATAV | LEUART_IF_FERR | LEUART_IF_PERR | LEUART_IF_RXOF)) {
+ return serial_rx_irq_handler_asynch(obj);
+ } else if(LEUART_StatusGet(obj->serial.periph.leuart) & (LEUART_STATUS_TXBL | LEUART_STATUS_TXC)) {
+ return serial_tx_irq_handler_asynch(obj);
+ }
+ } else {
+ if(USART_IntGetEnabled(obj->serial.periph.uart) & (USART_IF_RXDATAV | USART_IF_RXOF | USART_IF_PERR | USART_IF_FERR)) {
+ return serial_rx_irq_handler_asynch(obj);
+ } else if(USART_StatusGet(obj->serial.periph.uart) & (USART_STATUS_TXBL | USART_STATUS_TXC)){
+ return serial_tx_irq_handler_asynch(obj);
+ }
+ }
+ }
+
+ // All should be done now
+ return 0;
+}
+
+/** Abort the ongoing TX transaction. It disables the enabled interupt for TX and
+ * flush TX hardware buffer if TX FIFO is used
+ *
+ * @param obj The serial object
+ */
+void serial_tx_abort_asynch(serial_t *obj)
+{
+ serial_tx_abort_asynch_intern(obj, 0);
+}
+
+static void serial_tx_abort_asynch_intern(serial_t *obj, int unblock_sleep)
+{
+ // Transmitter should be disabled here but there are multiple issues
+ // making that quite difficult.
+ //
+ // - Disabling the transmitter when using DMA on platforms prior to
+ // Pearl can cause the UART to leave the line low, generating a break
+ // condition until the next transmission begins.
+ //
+ // - On (at least) Pearl, once TXC interrupt has fired it will take some time
+ // (some tens of microsec) for TXC to be set in STATUS. If we turn off
+ // the transmitter before this, bad things will happen.
+ //
+ // - On (at least) Pearl, when using TX DMA it is possible for the USART
+ // status to be: TXENS TXBL TXIDLE = 1, TXBUFCNT = 0, but TXC = 0.
+ //
+ // All in all, the logic was so fragile it's best to leave it out.
+
+ /* Clean up */
+ switch(obj->serial.dmaOptionsTX.dmaUsageState) {
+ case DMA_USAGE_ALLOCATED:
+ /* stop DMA transfer */
+#ifndef LDMA_PRESENT
+ DMA_ChannelEnable(obj->serial.dmaOptionsTX.dmaChannel, false);
+#else
+ LDMA_StopTransfer(obj->serial.dmaOptionsTX.dmaChannel);
+#endif
+ break;
+ case DMA_USAGE_TEMPORARY_ALLOCATED:
+ /* stop DMA transfer and release channel */
+#ifndef LDMA_PRESENT
+ DMA_ChannelEnable(obj->serial.dmaOptionsTX.dmaChannel, false);
+#else
+ LDMA_StopTransfer(obj->serial.dmaOptionsTX.dmaChannel);
+#endif
+ dma_channel_free(obj->serial.dmaOptionsTX.dmaChannel);
+ obj->serial.dmaOptionsTX.dmaChannel = -1;
+ obj->serial.dmaOptionsTX.dmaUsageState = DMA_USAGE_OPPORTUNISTIC;
+ break;
+ default:
+ break;
+ }
+
+ /* stop interrupting */
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ LEUART_IntDisable(obj->serial.periph.leuart, LEUART_IEN_TXBL);
+ LEUART_IntDisable(obj->serial.periph.leuart, LEUART_IEN_TXC);
+ LEUART_IntClear(obj->serial.periph.leuart, LEUART_IFC_TXC);
+ } else {
+ USART_IntDisable(obj->serial.periph.uart, USART_IEN_TXBL);
+ USART_IntDisable(obj->serial.periph.uart, USART_IEN_TXC);
+ USART_IntClear(obj->serial.periph.uart, USART_IFC_TXC);
+ }
+
+ /* Say that we can stop using this emode */
+ if(unblock_sleep)
+ serial_unblock_sleep(obj);
+}
+
+
+static void serial_unblock_sleep(serial_t *obj)
+{
+ if( obj->serial.sleep_blocked > 0 ) {
+#ifdef LEUART_USING_LFXO
+ if(LEUART_REF_VALID(obj->serial.periph.leuart) && (LEUART_BaudrateGet(obj->serial.periph.leuart) <= (LEUART_LF_REF_FREQ/2))){
+ unblockSleepMode(SERIAL_LEAST_ACTIVE_SLEEPMODE_LEUART);
+ }else{
+ unblockSleepMode(SERIAL_LEAST_ACTIVE_SLEEPMODE);
+ }
+#else
+ unblockSleepMode(SERIAL_LEAST_ACTIVE_SLEEPMODE);
+#endif
+ obj->serial.sleep_blocked--;
+ }
+}
+
+static void serial_block_sleep(serial_t *obj)
+{
+ obj->serial.sleep_blocked++;
+#ifdef LEUART_USING_LFXO
+ if(LEUART_REF_VALID(obj->serial.periph.leuart) && (LEUART_BaudrateGet(obj->serial.periph.leuart) <= (LEUART_LF_REF_FREQ/2))){
+ blockSleepMode(SERIAL_LEAST_ACTIVE_SLEEPMODE_LEUART);
+ }else{
+ blockSleepMode(SERIAL_LEAST_ACTIVE_SLEEPMODE);
+ }
+#else
+ blockSleepMode(SERIAL_LEAST_ACTIVE_SLEEPMODE);
+#endif
+}
+
+/** Abort the ongoing RX transaction It disables the enabled interrupt for RX and
+ * flush RX hardware buffer if RX FIFO is used
+ *
+ * @param obj The serial object
+ */
+void serial_rx_abort_asynch(serial_t *obj)
+{
+ serial_rx_abort_asynch_intern(obj, 0);
+}
+
+static void serial_rx_abort_asynch_intern(serial_t *obj, int unblock_sleep)
+{
+ /* Stop receiver */
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ obj->serial.periph.leuart->CMD = LEUART_CMD_RXDIS;
+ while(obj->serial.periph.leuart->SYNCBUSY & LEUART_SYNCBUSY_CMD);
+ } else {
+ obj->serial.periph.uart->CMD = USART_CMD_RXDIS;
+ }
+
+ /* Clean up */
+ switch(obj->serial.dmaOptionsRX.dmaUsageState) {
+ case DMA_USAGE_ALLOCATED:
+ /* stop DMA transfer */
+#ifndef LDMA_PRESENT
+ DMA_ChannelEnable(obj->serial.dmaOptionsRX.dmaChannel, false);
+#else
+ LDMA_StopTransfer(obj->serial.dmaOptionsRX.dmaChannel);
+#endif
+ break;
+ case DMA_USAGE_TEMPORARY_ALLOCATED:
+ /* stop DMA transfer and release channel */
+#ifndef LDMA_PRESENT
+ DMA_ChannelEnable(obj->serial.dmaOptionsRX.dmaChannel, false);
+#else
+ LDMA_StopTransfer(obj->serial.dmaOptionsRX.dmaChannel);
+#endif
+ dma_channel_free(obj->serial.dmaOptionsRX.dmaChannel);
+ obj->serial.dmaOptionsRX.dmaChannel = -1;
+ obj->serial.dmaOptionsRX.dmaUsageState = DMA_USAGE_OPPORTUNISTIC;
+ break;
+ default:
+ /* stop interrupting */
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ LEUART_IntDisable(obj->serial.periph.leuart, LEUART_IEN_RXDATAV | LEUART_IEN_PERR | LEUART_IEN_FERR | LEUART_IEN_RXOF);
+ } else {
+ USART_IntDisable(obj->serial.periph.uart, USART_IEN_RXDATAV | USART_IEN_PERR | USART_IEN_FERR | USART_IEN_RXOF);
+ }
+ break;
+ }
+
+ /*clear all set interrupts*/
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ LEUART_IntClear(obj->serial.periph.leuart, LEUART_IFC_PERR | LEUART_IFC_FERR | LEUART_IFC_RXOF);
+ }else{
+ USART_IntClear(obj->serial.periph.uart, USART_IFC_PERR | USART_IFC_FERR | USART_IFC_RXOF);
+ }
+
+ /* Say that we can stop using this emode */
+ if( unblock_sleep )
+ serial_unblock_sleep(obj);
+}
+
+#endif //DEVICE_SERIAL_ASYNCH
+#endif //DEVICE_SERIAL
