[NUCLEO_F030R8] Add serial api

Author: bcostm

libraries/mbed/targets/hal/TARGET_STM/TARGET_NUCLEO_F030R8/serial_api.c

@@ -0,0 +1,280 @@
+/* mbed Microcontroller Library
+ *******************************************************************************
+ * Copyright (c) 2014, STMicroelectronics
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of STMicroelectronics nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *******************************************************************************
+ */
+#include "serial_api.h"
+#include "cmsis.h"
+#include "pinmap.h"
+#include "error.h"
+#include <string.h>
+
+static const PinMap PinMap_UART_TX[] = {
+    {PA_9,  UART_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_1)},
+    {PA_2,  UART_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_1)},
+    {NC,    NC,     0}
+};
+
+static const PinMap PinMap_UART_RX[] = {
+    {PA_10, UART_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_1)},
+    {PA_3,  UART_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_1)},
+    {NC,    NC,     0}
+};
+
+#define UART_NUM (2)
+
+static uint32_t serial_irq_ids[UART_NUM] = {0};
+
+static uart_irq_handler irq_handler;
+
+int stdio_uart_inited = 0;
+serial_t stdio_uart;
+
+static void init_usart(serial_t *obj) {
+    USART_TypeDef *usart = (USART_TypeDef *)(obj->uart);
+    USART_InitTypeDef USART_InitStructure;
+  
+    USART_Cmd(usart, DISABLE);
+
+    USART_InitStructure.USART_BaudRate = obj->baudrate;
+    USART_InitStructure.USART_WordLength = obj->databits;
+    USART_InitStructure.USART_StopBits = obj->stopbits;
+    USART_InitStructure.USART_Parity = obj->parity;
+    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
+    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
+    USART_Init(usart, &USART_InitStructure);
+    
+    USART_Cmd(usart, ENABLE);
+}
+
+void serial_init(serial_t *obj, PinName tx, PinName rx) {  
+    // Determine the UART to use (UART_1, UART_2, ...)
+    UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX);
+    UARTName uart_rx = (UARTName)pinmap_peripheral(rx, PinMap_UART_RX);
+  
+    // Get the peripheral name (UART_1, UART_2, ...) from the pin and assign it to the object
+    obj->uart = (UARTName)pinmap_merge(uart_tx, uart_rx);
+
+    if (obj->uart == (UARTName)NC) {
+        error("Serial pinout mapping failed");
+    }
+
+    // Enable USART clock
+    if (obj->uart == UART_1) {
+        RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); 
+    }
+    if (obj->uart == UART_2) {
+        RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); 
+    }
+            
+    // Configure the UART pins
+    pinmap_pinout(tx, PinMap_UART_TX);
+    pinmap_pinout(rx, PinMap_UART_RX);
+    pin_mode(tx, PullUp);
+    pin_mode(rx, PullUp);
+    
+    // Configure UART
+    obj->baudrate = 9600;
+    obj->databits = USART_WordLength_8b;
+    obj->stopbits = USART_StopBits_1;
+    obj->parity = USART_Parity_No;    
+
+    init_usart(obj);
+
+    // The index is used by irq
+    if (obj->uart == UART_1) obj->index = 0;
+    if (obj->uart == UART_2) obj->index = 1;
+    
+    // For stdio management
+    if (obj->uart == STDIO_UART) {
+        stdio_uart_inited = 1;
+        memcpy(&stdio_uart, obj, sizeof(serial_t));
+    }
+    
+}
+
+void serial_free(serial_t *obj) {
+    serial_irq_ids[obj->index] = 0;
+}
+
+void serial_baud(serial_t *obj, int baudrate) {
+    obj->baudrate = baudrate;
+    init_usart(obj);
+}
+
+void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) {
+    if (data_bits == 8) {
+        obj->databits = USART_WordLength_8b;
+    }
+    else {
+        obj->databits = USART_WordLength_9b;
+    }
+
+    switch (parity) {
+      case ParityOdd:
+      case ParityForced0:
+          obj->parity = USART_Parity_Odd;
+      break;
+      case ParityEven:
+      case ParityForced1:        
+          obj->parity = USART_Parity_Even;
+      break;
+      default: // ParityNone
+          obj->parity = USART_Parity_No;
+      break;
+    }
+    
+    if (stop_bits == 2) {
+        obj->stopbits = USART_StopBits_2;
+    }
+    else {
+        obj->stopbits = USART_StopBits_1;
+    }
+
+    init_usart(obj);
+}
+
+/******************************************************************************
+ * INTERRUPTS HANDLING
+ ******************************************************************************/
+
+// not api
+static void uart_irq(USART_TypeDef* usart, int id) {
+    if (serial_irq_ids[id] != 0) {
+        if (USART_GetITStatus(usart, USART_IT_TC) != RESET) {
+            irq_handler(serial_irq_ids[id], TxIrq);
+            USART_ClearITPendingBit(usart, USART_IT_TC);
+        }
+        if (USART_GetITStatus(usart, USART_IT_RXNE) != RESET) {
+            irq_handler(serial_irq_ids[id], RxIrq);
+            USART_ClearITPendingBit(usart, USART_IT_RXNE);
+        }
+    }
+}
+
+static void uart1_irq(void) {uart_irq((USART_TypeDef*)UART_1, 0);}
+static void uart2_irq(void) {uart_irq((USART_TypeDef*)UART_2, 1);}
+
+void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id) {
+    irq_handler = handler;
+    serial_irq_ids[obj->index] = id;
+}
+
+void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable) {
+    IRQn_Type irq_n = (IRQn_Type)0;
+    uint32_t vector = 0;
+    USART_TypeDef *usart = (USART_TypeDef *)(obj->uart);
+
+    if (obj->uart == UART_1) {
+      irq_n = USART1_IRQn;
+      vector = (uint32_t)&uart1_irq;
+    }
+  
+    if (obj->uart == UART_2) {
+      irq_n = USART2_IRQn;
+      vector = (uint32_t)&uart2_irq;
+    }
+    
+    if (enable) {
+      
+        if (irq == RxIrq) {
+            USART_ITConfig(usart, USART_IT_RXNE, ENABLE);
+        }
+        else { // TxIrq
+            USART_ITConfig(usart, USART_IT_TC, ENABLE);
+        }        
+        
+        NVIC_SetVector(irq_n, vector);
+        NVIC_EnableIRQ(irq_n);
+        
+    } else { // disable
+      
+        int all_disabled = 0;
+        
+        if (irq == RxIrq) {
+            USART_ITConfig(usart, USART_IT_RXNE, DISABLE);
+            // Check if TxIrq is disabled too
+            if ((usart->CR1 & USART_CR1_TXEIE) == 0) all_disabled = 1;
+        }
+        else { // TxIrq
+            USART_ITConfig(usart, USART_IT_TXE, DISABLE);
+            // Check if RxIrq is disabled too
+            if ((usart->CR1 & USART_CR1_RXNEIE) == 0) all_disabled = 1;          
+        }
+        
+        if (all_disabled) NVIC_DisableIRQ(irq_n);
+        
+    }    
+}
+
+/******************************************************************************
+ * READ/WRITE
+ ******************************************************************************/
+
+int serial_getc(serial_t *obj) {
+    USART_TypeDef *usart = (USART_TypeDef *)(obj->uart);
+    while (!serial_readable(obj));
+    return (int)(USART_ReceiveData(usart));
+}
+
+void serial_putc(serial_t *obj, int c) {
+    USART_TypeDef *usart = (USART_TypeDef *)(obj->uart);
+    while (!serial_writable(obj));
+    USART_SendData(usart, (uint16_t)c);
+}
+
+int serial_readable(serial_t *obj) {
+    int status;
+    USART_TypeDef *usart = (USART_TypeDef *)(obj->uart);
+    // Check if data is received
+    status = ((USART_GetFlagStatus(usart, USART_FLAG_RXNE) != RESET) ? 1 : 0);
+    return status;
+}
+
+int serial_writable(serial_t *obj) {
+    int status;
+    USART_TypeDef *usart = (USART_TypeDef *)(obj->uart);
+    // Check if data is transmitted
+    status = ((USART_GetFlagStatus(usart, USART_FLAG_TXE) != RESET) ? 1 : 0);
+    return status;
+}
+
+void serial_clear(serial_t *obj) {
+    USART_TypeDef *usart = (USART_TypeDef *)(obj->uart);
+    USART_ClearFlag(usart, USART_FLAG_TXE);
+    USART_ClearFlag(usart, USART_FLAG_RXNE);
+}
+
+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) {
+}