Diff: targets/hal/TARGET_STM/TARGET_DISCO_F303VC/serial_api.c

Revision:

241:ffe41b0c8126

Parent:

227:7bd0639b8911

--- a/targets/hal/TARGET_STM/TARGET_DISCO_F303VC/serial_api.c	Thu Jun 26 09:45:08 2014 +0100
+++ b/targets/hal/TARGET_STM/TARGET_DISCO_F303VC/serial_api.c	Thu Jun 26 10:30:09 2014 +0100
@@ -29,6 +29,9 @@
  */
 #include "mbed_assert.h"
 #include "serial_api.h"
+
+#if DEVICE_SERIAL
+
 #include "cmsis.h"
 #include "pinmap.h"
 #include <string.h>
@@ -97,12 +100,15 @@
     // Enable USART clock
     if (obj->uart == UART_1) {
         RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
+        obj->index = 0;
     }
     if (obj->uart == UART_2) {
         RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
+        obj->index = 1;
     }
     if (obj->uart == UART_3) {
         RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
+        obj->index = 2;
     }
     
     // Configure the UART pins
@@ -117,12 +123,10 @@
     obj->stopbits = USART_StopBits_1;
     obj->parity = USART_Parity_No;
 
-    init_usart(obj);
+    obj->pin_tx = tx;
+    obj->pin_rx = rx;
 
-    // The index is used by irq
-    if (obj->uart == UART_1) obj->index = 0;
-    if (obj->uart == UART_2) obj->index = 1;
-    if (obj->uart == UART_3) obj->index = 2;
+    init_usart(obj);
     
     // For stdio management
     if (obj->uart == STDIO_UART) {
@@ -133,6 +137,27 @@
 }
 
 void serial_free(serial_t *obj) {
+    // Reset UART and disable clock
+    if (obj->uart == UART_1) {
+        RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, ENABLE);
+        RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, DISABLE);
+        RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, DISABLE);
+    }
+    if (obj->uart == UART_2) {
+        RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, ENABLE);
+        RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, DISABLE);
+        RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, DISABLE);
+    }
+    if (obj->uart == UART_3) {
+        RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, ENABLE);
+        RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, DISABLE);
+        RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, DISABLE);
+    }
+
+    // Configure GPIOs
+    pin_function(obj->pin_tx, STM_PIN_DATA(GPIO_Mode_IN, 0, GPIO_PuPd_NOPULL, 0xFF));
+    pin_function(obj->pin_rx, STM_PIN_DATA(GPIO_Mode_IN, 0, GPIO_PuPd_NOPULL, 0xFF));
+
     serial_irq_ids[obj->index] = 0;
 }
 
@@ -306,3 +331,5 @@
     USART_RequestCmd(usart, USART_Request_SBKRQ, DISABLE);
     USART_ClearFlag(usart, USART_FLAG_SBK);
 }
+
+#endif