Diff: targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/serial_api.c

Revision:

52:a51c77007319

Child:

55:3b765ca737a5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/serial_api.c	Mon Dec 02 11:30:05 2013 +0000
@@ -0,0 +1,310 @@
+/* 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.
+ */
+//==============================================================================
+// STM32F103
+//==============================================================================  
+#include "serial_api.h"
+#include "cmsis.h"
+#include "pinmap.h"
+#include "error.h"
+#include <string.h>
+
+/******************************************************************************
+ * INITIALIZATION
+ ******************************************************************************/
+
+static const PinMap PinMap_UART_TX[] = {
+    {PA_9,  UART_1, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)},
+    {PA_2,  UART_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)},
+    {NC,    NC,     0}
+};
+
+static const PinMap PinMap_UART_RX[] = {
+    {PA_10, UART_1, STM_PIN_DATA(GPIO_Mode_IN_FLOATING, 0)},
+    {PA_3,  UART_2, STM_PIN_DATA(GPIO_Mode_IN_FLOATING, 0)},
+    {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;
+
+void serial_init(serial_t *obj, PinName tx, PinName rx) {
+    
+    USART_TypeDef *usart;
+    USART_InitTypeDef USART_InitStructure;
+  
+    // 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");
+    }
+    
+    // Get UART registers structure address
+    usart = (USART_TypeDef *)(obj->uart);
+  
+    // 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);
+
+    // Configure UART
+    obj->baudrate = 9600;
+    obj->databits = USART_WordLength_8b;
+    obj->stopbits = USART_StopBits_1;
+    obj->parity = USART_Parity_No;    
+
+    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);
+
+    // 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) {
+    USART_TypeDef *usart = (USART_TypeDef *)(obj->uart);
+    USART_InitTypeDef USART_InitStructure;
+    
+    // Save new value
+    obj->baudrate = baudrate;
+
+    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_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) {
+    USART_TypeDef *usart = (USART_TypeDef *)(obj->uart);
+    USART_InitTypeDef USART_InitStructure;
+
+    // Save new values
+  
+    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;
+    }
+
+    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);
+}
+
+/******************************************************************************
+ * INTERRUPTS HANDLING
+ ******************************************************************************/
+
+// not api
+void uart1_irq(void) {
+    USART_TypeDef *usart = (USART_TypeDef *)UART_1;  
+    if (serial_irq_ids[0] != 0) {
+        if (USART_GetITStatus(usart, USART_IT_TXE) != RESET) {
+            irq_handler(serial_irq_ids[0], TxIrq);
+        }
+        if (USART_GetITStatus(usart, USART_IT_RXNE) != RESET) {
+            irq_handler(serial_irq_ids[0], RxIrq);
+        }
+    }
+}
+
+// not api
+void uart2_irq(void) {
+    USART_TypeDef *usart = (USART_TypeDef *)UART_2;  
+    if (serial_irq_ids[1] != 0) {
+        if (USART_GetITStatus(usart, USART_IT_TXE) != RESET) {
+            irq_handler(serial_irq_ids[1], TxIrq);
+        }
+        if (USART_GetITStatus(usart, USART_IT_RXNE) != RESET) {
+            irq_handler(serial_irq_ids[1], RxIrq);
+        }
+    }
+}
+
+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_TXE, 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) {
+    USART_TypeDef *usart = (USART_TypeDef *)(obj->uart);
+    USART_SendBreak(usart);
+}
+
+void serial_break_clear(serial_t *obj) {
+}