adding hwflwctl support for NUCLEO_F401RE (#1654)

Author: mridup

libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F401RE/PeripheralPins.c

@@ -147,6 +147,28 @@ const PinMap PinMap_UART_RX[] = {
     {NC,    NC,     0}
 };
 
+const PinMap PinMap_UART_RTS[] = {
+    {PA_1,  UART_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART2)},
+    {PA_12, UART_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)},
+ // {PA_15, UART_4, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_UART4)},
+ // {PB_14, UART_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART3)}, // MEMs
+ // {PC_8,  UART_5, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_UART5)},
+ // {PD_4,  UART_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART2)},
+ // {PD_12, UART_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_UART3)}, // LED D4
+    {NC,    NC,     0}
+};
+ 
+const PinMap PinMap_UART_CTS[] = {
+    {PA_0,  UART_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART2)},
+    {PA_11, UART_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)},
+ // {PB_0,  UART_4, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_UART4)},
+ // {PB_13, UART_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART3)},
+ // {PC_9,  UART_5, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_UART5)}, 
+ // {PD_3,  UART_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART2)},
+ // {PD_11, UART_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_UART3)}, // LED D4
+    {NC,    NC,     0}
+};
+
 //*** SPI ***
 
 const PinMap PinMap_SPI_MOSI[] = {

libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F401RE/device.h

@@ -40,6 +40,7 @@
 #define DEVICE_ANALOGOUT        0 // Not present on this device
 
 #define DEVICE_SERIAL           1
+#define DEVICE_SERIAL_FC        1
 
 #define DEVICE_I2C              1
 #define DEVICE_I2CSLAVE         1

libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F401RE/objects.h

@@ -69,6 +69,11 @@ struct serial_s {
     uint32_t parity;
     PinName pin_tx;
     PinName pin_rx;
+#if DEVICE_SERIAL_FC
+    uint32_t hw_flow_ctl;
+    PinName pin_rts;
+    PinName pin_cts;
+#endif
 };
 
 struct spi_s {