[DISCO_F746NG] Fix issue with Virtual Com Port

- Add also missing two PWM signals

libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F7/TARGET_DISCO_F746NG/PeripheralNames.h

@@ -57,9 +57,9 @@ typedef enum {
     UART_8 = (int)UART8_BASE
 } UARTName;
 
-#define STDIO_UART_TX  PC_6
+#define STDIO_UART_TX  PA_9
-#define STDIO_UART_RX  PC_7
+#define STDIO_UART_RX  PB_7
-#define STDIO_UART     UART_6
+#define STDIO_UART     UART_1
 
 typedef enum {
     SPI_1 = (int)SPI1_BASE,

libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F7/TARGET_DISCO_F746NG/PeripheralPins.c

@@ -94,6 +94,8 @@ const PinMap PinMap_PWM[] = {
     {PC_7,  PWM_8,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM8,  2, 0)}, // TIM8_CH2 - ARDUINO D0
     {PF_6,  PWM_10, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM10, 1, 0)}, // TIM10_CH1 - ARDUINO A5
     {PF_7,  PWM_11, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM11, 1, 0)}, // TIM11_CH1 - ARDUINO A4
+    {PF_8,  PWM_13, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF9_TIM13, 1, 0)}, // TIM13_CH1 - ARDUINO A3
+    {PF_9,  PWM_14, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF9_TIM14, 1, 0)}, // TIM14_CH1 - ARDUINO A2
     {PH_6,  PWM_12, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF9_TIM12, 1, 0)}, // TIM12_CH1 - ARDUINO D6
 //  {PI_0,  PWM_5,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM5,  4, 0)}, // TIM5_CH4 - ARDUINO D10 (used by us_ticker)
     {PI_2,  PWM_8,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM8,  4, 0)}, // TIM8_CH4 - ARDUINO D8
@@ -104,12 +106,14 @@ const PinMap PinMap_PWM[] = {
 
 const PinMap PinMap_UART_TX[] = {
     {PA_0,  UART_4, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_UART4)}, // ARDUINO A0
+    {PA_9,  UART_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)}, // Virtual Com Port
     {PC_6,  UART_6, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_USART6)}, // ARDUINO D1
     {PF_7,  UART_7, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_UART7)}, // ARDUINO A4
     {NC,    NC,     0}
 };
 
 const PinMap PinMap_UART_RX[] = {
+    {PB_7,  UART_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)}, // Virtual Com Port
     {PC_7,  UART_6, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_USART6)}, // ARDUINO D0
     {PF_6,  UART_7, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_UART7)}, // ARDUINO A5
     {NC,    NC,     0}

libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F7/TARGET_DISCO_F746NG/PinNames.h

@@ -286,17 +286,17 @@ typedef enum {
     LED3        = PI_1,
     LED4        = PI_1,
     USER_BUTTON = PI_11,
-    SERIAL_TX   = PC_6,
+    SERIAL_TX   = D1,
-    SERIAL_RX   = PC_7,
+    SERIAL_RX   = D0,
-    USBTX       = PC_6,
+    USBTX       = PA_9, // Virtual Com Port
-    USBRX       = PC_7,
+    USBRX       = PB_7, // Virtual Com Port
-    I2C_SCL     = PB_8,
+    I2C_SCL     = D15,
-    I2C_SDA     = PB_9,
+    I2C_SDA     = D14,
-    SPI_MOSI    = PB_15,
+    SPI_MOSI    = D11,
-    SPI_MISO    = PB_14,
+    SPI_MISO    = D12,
-    SPI_SCK     = PI_1,
+    SPI_SCK     = D13,
-    SPI_CS      = PI_0,
+    SPI_CS      = D10,
-    PWM_OUT     = PB_4,
+    PWM_OUT     = D9,
 
     // Not connected
     NC = (int)0xFFFFFFFF

libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F7/serial_api.c

@@ -36,6 +36,7 @@
 #include "pinmap.h"
 #include <string.h>
 #include "PeripheralPins.h"
+#include "mbed_error.h"
 
 #define UART_NUM (8)
 
@@ -66,7 +67,9 @@ static void init_uart(serial_t *obj)
         UartHandle.Init.Mode = UART_MODE_TX_RX;
     }
 
-    HAL_UART_Init(&UartHandle);
+    if (HAL_UART_Init(&UartHandle) != HAL_OK) {
+        error("Cannot initialize UART");
+    }
 }
 
 void serial_init(serial_t *obj, PinName tx, PinName rx)