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mbed library sources
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Diff: targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/serial_api.c
- Revision:
- 525:c320967f86b9
- Child:
- 526:7c4bdfe6a168
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/serial_api.c Tue Apr 28 11:45:12 2015 +0100
@@ -0,0 +1,1717 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * 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 <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"
+
+#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[SERIAL_NUM_UARTS] = { 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, int, SerialIrq);
+uint8_t serial_get_index(serial_t *obj);
+IRQn_Type serial_get_rx_irq_index(serial_t *obj);
+IRQn_Type serial_get_tx_irq_index(serial_t *obj);
+CMU_Clock_TypeDef serial_get_clock(serial_t *obj);
+
+/* ISRs for RX and TX events */
+#ifdef UART0
+static void uart0_rx_irq() { uart_irq(UART_0, 0, RxIrq); }
+static void uart0_tx_irq() { uart_irq(UART_0, 0, TxIrq); USART_IntClear((USART_TypeDef*)UART_0, USART_IFC_TXC);}
+#endif
+#ifdef UART1
+static void uart1_rx_irq() { uart_irq(UART_1, 1, RxIrq); }
+static void uart1_tx_irq() { uart_irq(UART_1, 1, TxIrq); USART_IntClear((USART_TypeDef*)UART_1, USART_IFC_TXC);}
+#endif
+#ifdef USART0
+static void usart0_rx_irq() { uart_irq(USART_0, 2, RxIrq); }
+static void usart0_tx_irq() { uart_irq(USART_0, 2, TxIrq); USART_IntClear((USART_TypeDef*)USART_0, USART_IFC_TXC);}
+#endif
+#ifdef USART1
+static void usart1_rx_irq() { uart_irq(USART_1, 3, RxIrq); }
+static void usart1_tx_irq() { uart_irq(USART_1, 3, TxIrq); USART_IntClear((USART_TypeDef*)USART_1, USART_IFC_TXC);}
+#endif
+#ifdef USART2
+static void usart2_rx_irq() { uart_irq(USART_2, 4, RxIrq); }
+static void usart2_tx_irq() { uart_irq(USART_2, 4, 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_IFC_PERR | LEUART_IF_RXOF)) {
+ uart_irq(LEUART_0, 5, RxIrq);
+ } else {
+ uart_irq(LEUART_0, 5, TxIrq);
+ }
+}
+#endif
+#ifdef LEUART1
+static void leuart1_irq() {
+ if(LEUART_IntGetEnabled(LEUART1) && (LEUART_IF_RXDATAV | LEUART_IF_FERR | LEUART_IFC_PERR | LEUART_IF_RXOF)) {
+ uart_irq(LEUART_1, 6, RxIrq);
+ } else {
+ uart_irq(LEUART_1, 6, TxIrq);
+ }
+}
+#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)
+{
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ LEUART_Init_TypeDef init = LEUART_INIT_DEFAULT;
+
+ init.enable = leuartDisable;
+ init.baudrate = 9600;
+ init.databits = leuartDatabits8;
+ init.parity = leuartNoParity;
+ init.stopbits = leuartStopbits1;
+
+ /* Determine the reference clock, because the correct clock is not set up at init time */
+ init.refFreq = LEUART_REF_FREQ;
+
+ LEUART_Init(obj->serial.periph.leuart, &init);
+ } else {
+ USART_InitAsync_TypeDef init = USART_INITASYNC_DEFAULT;
+
+ init.enable = usartDisable;
+ init.baudrate = 9600;
+ init.oversampling = usartOVS16;
+ init.databits = usartDatabits8;
+ init.parity = usartNoParity;
+ init.stopbits = usartStopbits1;
+
+ /* Determine the reference clock, because the correct clock is not set up at init time */
+ 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 object
+* @return internal index of U(S)ART peripheral
+*/
+inline uint8_t serial_get_index(serial_t *obj)
+{
+ switch ((uint32_t)obj->serial.periph.uart) {
+#ifdef UART0
+ case UART_0:
+ return 0;
+#endif
+#ifdef UART1
+ case UART_1:
+ return 1;
+#endif
+#ifdef USART0
+ case USART_0:
+ return 2;
+#endif
+#ifdef USART1
+ case USART_1:
+ return 3;
+#endif
+#ifdef USART2
+ case USART_2:
+ return 4;
+#endif
+#ifdef LEUART0
+ case LEUART_0:
+ return 5;
+#endif
+#ifdef LEUART1
+ case LEUART_1:
+ return 6;
+#endif
+ }
+ return 0;
+}
+
+/**
+* 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
+*/
+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 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
+*/
+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 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);
+ /* 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);
+
+ /* Store pins in object for easy disabling in serial_free() */
+ 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
+ }
+}
+
+void serial_enable_pins(serial_t *obj, uint8_t enable)
+{
+ if (enable) {
+ /* Configure GPIO pins*/
+ pin_mode(obj->serial.rx_pin, Input);
+ /* 0x10 sets DOUT. Prevents false start. */
+ pin_mode(obj->serial.tx_pin, PushPull | 0x10);
+ } else {
+ pin_mode(obj->serial.rx_pin, Disabled);
+ pin_mode(obj->serial.tx_pin, Disabled);
+ }
+}
+
+void serial_init(serial_t *obj, PinName tx, PinName rx)
+{
+ serial_preinit(obj, tx, rx);
+
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ // Set up LEUART clock tree to use high-speed clock)
+ CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_CORELEDIV2);
+ CMU_ClockSelectSet(serial_get_clock(obj), cmuSelect_CORELEDIV2);
+ }
+
+ CMU_ClockEnable(serial_get_clock(obj), true);
+
+ /* Configure UART for async operation */
+ uart_init(obj);
+
+ /* 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 )) {
+ serial_baud(obj, 115200);
+ }
+
+ /* Enable pins for UART at correct location */
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ obj->serial.periph.leuart->ROUTE = LEUART_ROUTE_RXPEN | LEUART_ROUTE_TXPEN | (obj->serial.location << _LEUART_ROUTE_LOCATION_SHIFT);
+ obj->serial.periph.leuart->IFC = LEUART_IFC_TXC;
+ } else {
+ obj->serial.periph.uart->ROUTE = USART_ROUTE_RXPEN | USART_ROUTE_TXPEN | (obj->serial.location << _USART_ROUTE_LOCATION_SHIFT);
+ 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 (obj->serial.periph.uart == (USART_TypeDef*)STDIO_UART ) {
+ stdio_uart_inited = 1;
+ memcpy(&stdio_uart, obj, sizeof(serial_t));
+
+ /* enable TX and RX by default for STDIO */
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ obj->serial.periph.leuart->CMD = LEUART_CMD_TXEN | LEUART_CMD_RXEN;
+ } else {
+ obj->serial.periph.uart->CMD = USART_CMD_TXEN | USART_CMD_RXEN;
+ }
+ }
+
+ serial_enable_pins(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_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)) {
+ LEUART_BaudrateSet(obj->serial.periph.leuart, LEUART_REF_FREQ, (uint32_t)baudrate);
+ } else {
+ USART_BaudrateAsyncSet(obj->serial.periph.uart, REFERENCE_FREQUENCY, (uint32_t)baudrate, usartOVS16);
+ }
+}
+
+/**
+ * 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 */
+ obj->serial.periph.leuart->ROUTE = LEUART_ROUTE_RXPEN | LEUART_ROUTE_TXPEN | (obj->serial.location << _LEUART_ROUTE_LOCATION_SHIFT);
+
+ /* 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 */
+ obj->serial.periph.uart->ROUTE = USART_ROUTE_RXPEN | USART_ROUTE_TXPEN | (obj->serial.location << _USART_ROUTE_LOCATION_SHIFT);
+
+ /* 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, int index, SerialIrq irq)
+{
+ 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));
+ } else {
+ USART_Tx(obj->serial.periph.uart, (uint8_t)(c));
+ }
+}
+
+/**
+ * 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)();
+ }
+}
+
+/******************************************
+* 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);
+ }
+
+
+}
+
+/******************************************
+* 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;
+ }
+}
+
+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 = cb;
+
+ // Set up configuration structure
+ channelConfig.dstInc = dmaDataIncNone;
+ channelConfig.srcInc = dmaDataInc1;
+ channelConfig.size = dmaDataSize1;
+ channelConfig.arbRate = dmaArbitrate1;
+ channelConfig.hprot = 0;
+
+ DMA_CfgDescr(obj->serial.dmaOptionsTX.dmaChannel, true, &channelConfig);
+
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ // Activate TX
+ obj->serial.periph.leuart->CMD = LEUART_CMD_TXEN;
+
+ // Clear TX buffer
+ obj->serial.periph.leuart->CMD = LEUART_CMD_CLEARTX;
+
+ // Kick off TX DMA
+ DMA_ActivateBasic(obj->serial.dmaOptionsTX.dmaChannel, true, false, (void*) &(obj->serial.periph.leuart->TXDATA), buffer, length - 1);
+ } else {
+ // Activate TX
+ obj->serial.periph.uart->CMD = USART_CMD_TXEN;
+
+ // Clear TX buffer
+ obj->serial.periph.uart->CMD = 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
+ obj->serial.periph.leuart->CMD = LEUART_CMD_RXEN;
+
+ // Clear RX buffer
+ obj->serial.periph.leuart->CMD = LEUART_CMD_CLEARRX;
+
+ // Kick off RX DMA
+ DMA_ActivateBasic(obj->serial.dmaOptionsRX.dmaChannel, true, false, buffer, (void*) &(obj->serial.periph.leuart->RXDATA), length - 1);
+ } else {
+ // Activate RX
+ obj->serial.periph.uart->CMD = USART_CMD_RXEN;
+
+ // Clear RX buffer
+ obj->serial.periph.uart->CMD = USART_CMD_CLEARRX;
+
+ // Kick off RX DMA
+ DMA_ActivateBasic(obj->serial.dmaOptionsRX.dmaChannel, true, false, buffer, (void*) &(obj->serial.periph.uart->RXDATA), length - 1);
+ }
+ }
+}
+
+/************************************************************************************
+ * 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;
+ }
+ if(event & SERIAL_EVENT_RX_CHARACTER_MATCH) {
+ /* This is only supported on LEUART in hardware. */
+ if(enable) obj->serial.periph.leuart->IEN |= LEUART_IEN_SIGF;
+ else obj->serial.periph.leuart->IEN &= ~LEUART_IEN_SIGF;
+ }
+ } 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;
+ }
+ if(event & SERIAL_EVENT_RX_CHARACTER_MATCH) {
+ /* This is currently unsupported in HW.
+ * In order to support this, we will have to switch to interrupt-based operation and check every incoming character.
+ */
+
+ //TODO: force interrupt-based operation when enabling character match.
+ }
+ }
+}
+
+/** 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;
+}
+
+/** Set character to be matched. If an event is enabled, and received character
+ * matches the defined char_match, the receiving process is stopped and MATCH event
+ * is invoked
+ *
+ * @param obj The serial object
+ * @param char_match A character in range 0-254
+ */
+void serial_set_char_match(serial_t *obj, uint8_t char_match) {
+ // We only have hardware support for this in LEUART.
+ // When in USART/UART, we can set up a check in the receiving ISR, but not when using DMA.
+ if (char_match != SERIAL_RESERVED_CHAR_MATCH) {
+ obj->char_match = char_match;
+
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ obj->serial.periph.leuart->SIGFRAME = char_match & 0x000000FF;
+ }
+ }
+
+ 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, 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, 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
+ blockSleepMode(SERIAL_LEAST_ACTIVE_SLEEPMODE);
+
+ // 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 return
+ obj->serial.periph.leuart->CMD = LEUART_CMD_TXEN;
+
+ // Clear TX buffer
+ obj->serial.periph.leuart->CMD = LEUART_CMD_CLEARTX;
+
+ // Enable interrupt
+ LEUART_IntEnable(obj->serial.periph.leuart, LEUART_IEN_TXBL);
+ } else {
+ // Activate TX and return
+ obj->serial.periph.uart->CMD = USART_CMD_TXEN;
+
+ // Clear TX buffer
+ obj->serial.periph.uart->CMD = 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, rx, rx_length, rx_width);
+
+ // Set up events
+ serial_rx_enable_event(obj, SERIAL_EVENT_RX_ALL, false);
+ serial_rx_enable_event(obj, event, true);
+ serial_set_char_match(obj, char_match);
+
+ // Set up sleepmode
+ blockSleepMode(SERIAL_LEAST_ACTIVE_SLEEPMODE);
+
+ // 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.
+ if(!(event & SERIAL_EVENT_RX_CHARACTER_MATCH)) {
+ serial_dmaTrySetState(&(obj->serial.dmaOptionsRX), hint, 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
+ obj->serial.periph.leuart->CMD = LEUART_CMD_RXEN;
+
+ // Clear RX buffer
+ obj->serial.periph.leuart->CMD = LEUART_CMD_CLEARRX;
+
+ // Enable interrupt
+ LEUART_IntEnable(obj->serial.periph.leuart, LEUART_IEN_RXDATAV);
+ } else {
+ // Activate RX
+ obj->serial.periph.uart->CMD = USART_CMD_RXEN;
+
+ // Clear RX buffer
+ obj->serial.periph.uart->CMD = 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) {
+ switch(obj->serial.dmaOptionsTX.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 */
+ return(DMA_ChannelEnabled(obj->serial.dmaOptionsTX.dmaChannel));
+ 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_TXBL)) ? true : false;
+ } else {
+ return (obj->serial.periph.uart->IEN & (USART_IEN_TXBL)) ? 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 */
+ return(DMA_ChannelEnabled(obj->serial.dmaOptionsRX.dmaChannel));
+ 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;
+
+ /* Interrupt has another TX source */
+ if(obj->tx_buff.pos >= obj->tx_buff.length) {
+ /* Transfer complete. Switch off interrupt and return event. */
+ serial_tx_abort_asynch(obj);
+ return SERIAL_EVENT_TX_COMPLETE & obj->serial.events;
+ } else {
+ /* There's still data in the buffer that needs to be sent */
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ while((LEUART_StatusGet(obj->serial.periph.leuart) & LEUART_STATUS_TXBL) && (obj->tx_buff.pos <= (obj->tx_buff.length - 1))) {
+ LEUART_Tx(obj->serial.periph.leuart, buf[obj->tx_buff.pos]);
+ obj->tx_buff.pos++;
+ }
+ } else {
+ 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++;
+ }
+ }
+ }
+ 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(obj);
+ 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(obj);
+ 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(obj);
+ return SERIAL_EVENT_RX_OVERFLOW;
+ }
+
+ if(LEUART_IntGetEnabled(obj->serial.periph.leuart) & LEUART_IF_SIGF) {
+ /* Char match has occurred, stop RX and return */
+ LEUART_IntClear(obj->serial.periph.leuart, LEUART_IFC_SIGF);
+ serial_rx_abort_asynch(obj);
+ return SERIAL_EVENT_RX_CHARACTER_MATCH;
+ }
+
+ 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(obj);
+ 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))) {
+
+ 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)) {
+ event |= SERIAL_EVENT_RX_CHARACTER_MATCH;
+ }
+
+ /* Check for final char event */
+ if(obj->rx_buff.pos >= (obj->rx_buff.length)) {
+ event |= SERIAL_EVENT_RX_COMPLETE & obj->serial.events;
+ }
+
+ if(event != 0) {
+ serial_rx_abort_asynch(obj);
+ 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(obj);
+ 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(obj);
+ 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(obj);
+ 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(obj);
+ 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))) {
+
+ 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)) {
+ event |= SERIAL_EVENT_RX_CHARACTER_MATCH;
+ }
+
+ /* Check for final char event */
+ if(obj->rx_buff.pos >= (obj->rx_buff.length)) {
+ event |= SERIAL_EVENT_RX_COMPLETE & obj->serial.events;
+ }
+
+ if(event != 0) {
+ serial_rx_abort_asynch(obj);
+ 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) {
+ /* First, check if we're running in DMA mode */
+ if(serial_dma_irq_fired[obj->serial.dmaOptionsRX.dmaChannel]) {
+ /* Clean up */
+ serial_dma_irq_fired[obj->serial.dmaOptionsRX.dmaChannel] = false;
+ serial_rx_abort_asynch(obj);
+
+ /* Notify CPP land of RX completion */
+ return SERIAL_EVENT_RX_COMPLETE & obj->serial.events;
+ } else if (serial_dma_irq_fired[obj->serial.dmaOptionsTX.dmaChannel]) {
+ /* Clean up */
+ serial_dma_irq_fired[obj->serial.dmaOptionsTX.dmaChannel] = false;
+ serial_tx_abort_asynch(obj);
+
+ /* 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 | LEUART_IF_SIGF)) {
+ return serial_rx_irq_handler_asynch(obj);
+ } else if(LEUART_StatusGet(obj->serial.periph.leuart) & LEUART_STATUS_TXBL) {
+ 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 {
+ 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) {
+ /* Stop transmitter */
+ //obj->serial.periph.uart->CMD |= USART_CMD_TXDIS;
+
+ /* Clean up */
+ switch(obj->serial.dmaOptionsTX.dmaUsageState) {
+ case DMA_USAGE_ALLOCATED:
+ /* stop DMA transfer */
+ DMA_ChannelEnable(obj->serial.dmaOptionsTX.dmaChannel, false);
+ break;
+ case DMA_USAGE_TEMPORARY_ALLOCATED:
+ /* stop DMA transfer and release channel */
+ DMA_ChannelEnable(obj->serial.dmaOptionsTX.dmaChannel, false);
+ dma_channel_free(obj->serial.dmaOptionsTX.dmaChannel);
+ obj->serial.dmaOptionsTX.dmaChannel = -1;
+ obj->serial.dmaOptionsTX.dmaUsageState = DMA_USAGE_OPPORTUNISTIC;
+ break;
+ default:
+ /* stop interrupting */
+ if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
+ LEUART_IntDisable(obj->serial.periph.leuart, LEUART_IEN_TXBL);
+ } else {
+ USART_IntDisable(obj->serial.periph.uart, USART_IEN_TXBL);
+ }
+ break;
+ }
+
+ /* Unblock EM2 and below */
+ unblockSleepMode(SERIAL_LEAST_ACTIVE_SLEEPMODE);
+}
+
+/** 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) {
+ /* Stop receiver */
+ obj->serial.periph.uart->CMD |= USART_CMD_RXDIS;
+
+ /* Clean up */
+ switch(obj->serial.dmaOptionsRX.dmaUsageState) {
+ case DMA_USAGE_ALLOCATED:
+ /* stop DMA transfer */
+ DMA_ChannelEnable(obj->serial.dmaOptionsRX.dmaChannel, false);
+ break;
+ case DMA_USAGE_TEMPORARY_ALLOCATED:
+ /* stop DMA transfer and release channel */
+ DMA_ChannelEnable(obj->serial.dmaOptionsRX.dmaChannel, false);
+ 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 | LEUART_IEN_SIGF);
+ } else {
+ USART_IntDisable(obj->serial.periph.uart, USART_IEN_RXDATAV | USART_IEN_PERR | USART_IEN_FERR | USART_IEN_RXOF);
+ }
+ break;
+ }
+
+ /* Say that we can stop using this emode */
+ unblockSleepMode(SERIAL_LEAST_ACTIVE_SLEEPMODE);
+}
+
+#endif //DEVICE_SERIAL_ASYNCH
+#endif //DEVICE_SERIAL