mbed official
mbed library sources. Supersedes mbed-src.
Dependents: Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more
Diff: targets/TARGET_ARM_SSG/TARGET_IOTSS/serial_api.c
- Revision:
- 149:156823d33999
- Parent:
- 80:bdf1132a57cf
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_ARM_SSG/TARGET_IOTSS/serial_api.c Fri Oct 28 11:17:30 2016 +0100
@@ -0,0 +1,367 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2015 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.
+ */
+// math.h required for floating point operations for baud rate calculation
+#include <math.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "serial_api.h"
+#include "cmsis.h"
+#include "pinmap.h"
+#include "mbed_error.h"
+#include "gpio_api.h"
+
+/******************************************************************************
+ * INITIALIZATION
+ ******************************************************************************/
+
+static const PinMap PinMap_UART_TX[] = {
+ {USBTX , UART_0, 0},
+ {XB_TX , UART_1, 0},
+ {SH0_TX , UART_2, 0},
+ {SH1_TX , UART_3, 0},
+ {NC , NC , 0}
+};
+
+static const PinMap PinMap_UART_RX[] = {
+ {USBRX , UART_0, 0},
+ {XB_RX , UART_1, 0},
+ {SH0_RX , UART_2, 0},
+ {SH1_RX , UART_3, 0},
+ {NC , NC , 0}
+};
+
+#define UART_NUM 4
+
+static uart_irq_handler irq_handler;
+
+int stdio_uart_inited = 0;
+serial_t stdio_uart;
+
+struct serial_global_data_s {
+ uint32_t serial_irq_id;
+ gpio_t sw_rts, sw_cts;
+ uint8_t count, rx_irq_set_flow, rx_irq_set_api;
+};
+
+static struct serial_global_data_s uart_data[UART_NUM];
+
+void serial_init(serial_t *obj, PinName tx, PinName rx) {
+ int is_stdio_uart = 0;
+
+ // determine the UART to use
+ UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX);
+ UARTName uart_rx = (UARTName)pinmap_peripheral(rx, PinMap_UART_RX);
+ UARTName uart = (UARTName)pinmap_merge(uart_tx, uart_rx);
+ if ((int)uart == NC) {
+ error("Serial pinout mapping failed");
+ }
+
+ obj->uart = (CMSDK_UART_TypeDef *)uart;
+ //set baud rate and enable Uart in normarl mode (RX and TX enabled)
+ switch (uart)
+ {
+ case UART_0: //UART HEADER
+ {
+ CMSDK_UART1->CTRL = 0x0; // Disable UART when changing configuration
+ if((int)tx != NC)
+ {
+ CMSDK_UART1->CTRL |= 0x01; // TX enable
+ } else {
+ CMSDK_UART1->CTRL &= 0xFFFE; // TX disable
+ }
+ if((int)rx != NC)
+ {
+ CMSDK_UART1->CTRL |= 0x02; // RX enable
+ } else {
+ CMSDK_UART1->CTRL &= 0xFFFD; // RX disable
+ }
+ }
+ break;
+ case UART_1: //XBEE SOCKET UART
+ {
+ CMSDK_UART3->CTRL = 0x00; // Disable UART when changing configuration
+ if((int)tx != NC)
+ {
+ CMSDK_UART3->CTRL = 0x1; // TX enable
+ CMSDK_GPIO4->ALTFUNCSET |= 0x0100;
+ }
+ if((int)rx != NC)
+ {
+ CMSDK_UART3->CTRL |= 0x2; // RX enable
+ CMSDK_GPIO4->ALTFUNCSET |= 0x0080;
+ }
+ }
+ break;
+ case UART_2: //Sheild0 UART
+ {
+ CMSDK_UART0->CTRL = 0x00; // Disable UART when changing configuration
+ if((int)uart_tx != NC)
+ {
+ CMSDK_UART0->CTRL |= 0x01; // TX enable
+ CMSDK_GPIO0->ALTFUNCSET |= 0x0002;
+ }
+
+ if((int)uart_rx != NC)
+ {
+ CMSDK_UART0->CTRL |= 0x02; // RX enable
+ CMSDK_GPIO0->ALTFUNCSET |= 0x0001;
+ }
+ }
+ break;
+ case UART_3: //Sheild1 UART
+ {
+ CMSDK_UART2->CTRL = 0x00; // Disable UART when changing configuration
+ if((int)tx != NC)
+ {
+ CMSDK_UART2->CTRL = 0x1; // TX enable
+ CMSDK_GPIO1->ALTFUNCSET |= 0x0002;
+ }
+ if((int)rx != NC)
+ {
+ CMSDK_UART2->CTRL |= 0x2; // RX enable
+ CMSDK_GPIO1->ALTFUNCSET |= 0x0001;
+ }
+ }
+ break;
+ }
+
+ // set default baud rate and format
+ serial_baud (obj, 9600);
+
+ // pinout the chosen uart
+ pinmap_pinout(tx, PinMap_UART_TX);
+ pinmap_pinout(rx, PinMap_UART_RX);
+
+ switch (uart) {
+ case UART_0: obj->index = 0; break;
+ case UART_1: obj->index = 1; break;
+ case UART_2: obj->index = 2; break;
+ case UART_3: obj->index = 3; break;
+ }
+ uart_data[obj->index].sw_rts.pin = NC;
+ uart_data[obj->index].sw_cts.pin = NC;
+ serial_set_flow_control(obj, FlowControlNone, NC, NC);
+
+ is_stdio_uart = (uart == STDIO_UART) ? (1) : (0);
+
+ if (is_stdio_uart) {
+ stdio_uart_inited = 1;
+ memcpy(&stdio_uart, obj, sizeof(serial_t));
+ }
+}
+
+void serial_free(serial_t *obj) {
+ uart_data[obj->index].serial_irq_id = 0;
+}
+
+// serial_baud
+// set the baud rate, taking in to account the current SystemFrequency
+void serial_baud(serial_t *obj, int baudrate) {
+ // The MPS2 has a simple divider to control the baud rate. The formula is:
+ //
+ // Baudrate = PCLK / BAUDDIV
+ //
+ // PCLK = 24 Mhz
+ // so for a desired baud rate of 9600
+ // 24000000 / 9600 = 2500
+ //
+ //check to see if minimum baud value entered
+ int baudrate_div = 0;
+ baudrate_div = SystemCoreClock / baudrate;
+ if(baudrate >= 16){
+ switch ((int)obj->uart) {
+ case UART_0: CMSDK_UART1->BAUDDIV = baudrate_div; break;
+ case UART_1: CMSDK_UART3->BAUDDIV = baudrate_div; break;
+ case UART_2: CMSDK_UART0->BAUDDIV = baudrate_div; break;
+ case UART_3: CMSDK_UART2->BAUDDIV = baudrate_div; break;
+ default: error("serial_baud"); break;
+ }
+ } else {
+ error("serial_baud");
+ }
+
+}
+
+void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) {
+}
+
+/******************************************************************************
+ * INTERRUPTS HANDLING
+ ******************************************************************************/
+static inline void uart_irq(uint32_t intstatus, uint32_t index, CMSDK_UART_TypeDef *puart) {
+ SerialIrq irq_type;
+ switch (intstatus)
+ {
+ case 1:
+ {
+ irq_type = TxIrq;
+ }
+ break;
+
+ case 2:
+ {
+ irq_type = RxIrq;
+ }
+ break;
+
+ default: return;
+ } /* End of Switch */
+
+ if ((RxIrq == irq_type) && (NC != uart_data[index].sw_rts.pin))
+ {
+ gpio_write(&uart_data[index].sw_rts, 1);
+ // Disable interrupt if it wasn't enabled by other part of the application
+ if (!uart_data[index].rx_irq_set_api)
+ {
+ /* Disable Rx interrupt */
+ puart->CTRL &= ~(CMSDK_UART_CTRL_RXIRQEN_Msk);
+ }
+ }
+
+ if (uart_data[index].serial_irq_id != 0)
+ {
+ if ((irq_type != RxIrq) || (uart_data[index].rx_irq_set_api))
+ {
+ irq_handler(uart_data[index].serial_irq_id, irq_type);
+ }
+ }
+
+ if( irq_type == TxIrq )
+ {
+ /* Clear the TX interrupt Flag */
+ puart->INTCLEAR |= 0x01;
+ }
+ else
+ {
+ /* Clear the Rx interupt Flag */
+ puart->INTCLEAR |= 0x02;
+ }
+}
+
+void uart0_irq() {uart_irq(CMSDK_UART1->INTSTATUS & 0x3, 0, (CMSDK_UART_TypeDef*)CMSDK_UART1);}
+void uart1_irq() {uart_irq(CMSDK_UART3->INTSTATUS & 0x3, 1, (CMSDK_UART_TypeDef*)CMSDK_UART3);}
+void uart2_irq() {uart_irq(CMSDK_UART0->INTSTATUS & 0x3, 2, (CMSDK_UART_TypeDef*)CMSDK_UART0);}
+void uart3_irq() {uart_irq(CMSDK_UART2->INTSTATUS & 0x3, 3, (CMSDK_UART_TypeDef*)CMSDK_UART2);}
+
+void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id) {
+ irq_handler = handler;
+ uart_data[obj->index].serial_irq_id = id;
+}
+
+static void serial_irq_set_internal(serial_t *obj, SerialIrq irq, uint32_t enable) {
+ IRQn_Type irq_n = (IRQn_Type)0;
+ uint32_t vector = 0;
+ switch ((int)obj->uart)
+ {
+ case UART_0:
+ irq_n = UART0_IRQn;
+ vector = (uint32_t)&uart0_irq;
+ break;
+ case UART_1:
+ irq_n = UART1_IRQn;
+ vector = (uint32_t)&uart1_irq;
+ break;
+ case UART_2:
+ {
+ irq_n = UART2_IRQn;
+ vector = (uint32_t)&uart2_irq;
+ }
+ break;
+ case UART_3:
+ {
+ irq_n = UART3_IRQn;
+ vector = (uint32_t)&uart3_irq;
+ }
+ break;
+ }
+
+ if (enable)
+ {
+ if (irq == TxIrq)
+ {
+ /* set TX interrupt enable in CTRL REG */
+ obj->uart->CTRL |= CMSDK_UART_CTRL_TXIRQEN_Msk;
+ }
+ else
+ {
+ /* set Rx interrupt on in CTRL REG */
+ obj->uart->CTRL |= CMSDK_UART_CTRL_RXIRQEN_Msk;
+ }
+ NVIC_SetVector(irq_n, vector);
+ NVIC_EnableIRQ(irq_n);
+ }
+ else if ((irq == TxIrq) || (uart_data[obj->index].rx_irq_set_api + uart_data[obj->index].rx_irq_set_flow == 0))
+ { /* Disable IRQ */
+ int all_disabled = 0;
+ SerialIrq other_irq = (irq == RxIrq) ? (TxIrq) : (RxIrq);
+
+ obj->uart->CTRL &= ~(1 << (irq + 2));
+
+ all_disabled = (obj->uart->CTRL & (1 << (other_irq + 2))) == 0;
+
+ if (all_disabled)
+ {
+ NVIC_DisableIRQ(irq_n);
+ }
+ }
+}
+
+void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable) {
+ if (RxIrq == irq)
+ uart_data[obj->index].rx_irq_set_api = enable;
+ serial_irq_set_internal(obj, irq, enable);
+}
+
+/******************************************************************************
+ * READ/WRITE
+ ******************************************************************************/
+int serial_getc(serial_t *obj) {
+ while (serial_readable(obj) == 0);
+ int data = obj->uart->DATA;
+ return data;
+}
+
+void serial_putc(serial_t *obj, int c) {
+ while (serial_writable(obj));
+ obj->uart->DATA = c;
+}
+
+int serial_readable(serial_t *obj) {
+ return obj->uart->STATE & 0x2;
+}
+
+int serial_writable(serial_t *obj) {
+ return obj->uart->STATE & 0x1;
+}
+
+void serial_clear(serial_t *obj) {
+ obj->uart->DATA = 0x00;
+}
+
+void serial_pinout_tx(PinName tx) {
+ pinmap_pinout(tx, PinMap_UART_TX);
+}
+
+void serial_break_set(serial_t *obj) {
+}
+
+void serial_break_clear(serial_t *obj) {
+}
+void serial_set_flow_control(serial_t *obj, FlowControl type, PinName rxflow, PinName txflow) {
+}
+
