diff --git a/hal/targets.json b/hal/targets.json
index 83034808a88..a1fedfa9721 100644
--- a/hal/targets.json
+++ b/hal/targets.json
@@ -758,7 +758,7 @@
         "inherits": ["Target"],
         "progen": {"target": "nucleo-f410rb"},
         "detect_code": ["0740"],
-        "device_has": ["ANALOGIN", "ANALOGOUT", "ERROR_RED", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
+        "device_has": ["ANALOGIN", "ANALOGOUT", "ERROR_RED", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_FC", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
         "release_versions": ["2", "5"]
     },
     "NUCLEO_F411RE": {
@@ -770,7 +770,7 @@
         "inherits": ["Target"],
         "progen": {"target": "nucleo-f411re"},
         "detect_code": ["0740"],
-        "device_has": ["ANALOGIN", "ERROR_RED", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
+        "device_has": ["ANALOGIN", "ERROR_RED", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_FC", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
         "release_versions": ["2", "5"]
     },
     "ELMO_F411RE": {
@@ -793,7 +793,7 @@
         "extra_labels": ["STM", "STM32F4", "STM32F429", "STM32F429ZI"],
         "supported_toolchains": ["ARM", "uARM", "GCC_ARM", "IAR"],
         "progen": {"target": "nucleo-f429zi"},
-        "device_has": ["ANALOGIN", "ANALOGOUT", "CAN", "ERROR_RED", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "RTC_LSI", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
+        "device_has": ["ANALOGIN", "ANALOGOUT", "CAN", "ERROR_RED", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "RTC_LSI", "SERIAL", "SERIAL_FC", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
         "detect_code": ["0796"],
         "release_versions": ["2", "5"]
     },
@@ -806,7 +806,7 @@
         "inherits": ["Target"],
         "progen": {"target": "nucleo-f446re"},
         "detect_code": ["0777"],
-        "device_has": ["ANALOGIN", "ANALOGOUT", "CAN", "ERROR_RED", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
+        "device_has": ["ANALOGIN", "ANALOGOUT", "CAN", "ERROR_RED", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_FC", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
         "release_versions": ["2", "5"]
     },
     "NUCLEO_F446ZE": {
@@ -818,7 +818,7 @@
         "inherits": ["Target"],
         "progen": {"target": "nucleo-f446ze"},
         "detect_code": ["0778"],
-        "device_has": ["ANALOGIN", "ANALOGOUT", "CAN", "ERROR_RED", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
+        "device_has": ["ANALOGIN", "ANALOGOUT", "CAN", "ERROR_RED", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_FC", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
         "release_versions": ["2"]
     },
 
@@ -1024,7 +1024,7 @@
         "extra_labels": ["STM", "STM32F4", "STM32F429", "STM32F429ZI"],
         "supported_toolchains": ["ARM", "uARM", "GCC_ARM", "IAR"],
         "progen": {"target": "disco-f429zi"},
-        "device_has": ["ANALOGIN", "ANALOGOUT", "CAN", "ERROR_RED", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "RTC_LSI", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
+        "device_has": ["ANALOGIN", "ANALOGOUT", "CAN", "ERROR_RED", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "RTC_LSI", "SERIAL", "SERIAL_FC", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
         "release_versions": ["2", "5"]
     },
     "DISCO_F469NI": {
@@ -1036,7 +1036,7 @@
         "inherits": ["Target"],
         "progen": {"target": "disco-f469ni"},
         "detect_code": ["0788"],
-        "device_has": ["ANALOGIN", "ANALOGOUT", "CAN", "ERROR_RED", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
+        "device_has": ["ANALOGIN", "ANALOGOUT", "CAN", "ERROR_RED", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_FC", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
         "release_versions": ["2", "5"]
     },
     "DISCO_L053C8": {
diff --git a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_DISCO_F429ZI/PeripheralPins.c b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_DISCO_F429ZI/PeripheralPins.c
index a6458ce760b..2c0379c0992 100644
--- a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_DISCO_F429ZI/PeripheralPins.c
+++ b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_DISCO_F429ZI/PeripheralPins.c
@@ -220,6 +220,28 @@ 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)}, // Connected to MEMS
+    {PA_12, UART_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)},
+//  {PB_14, UART_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART3)}, // Connected to USB
+    {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_USART3)},
+    {PG_8,  UART_6, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_USART6)},
+    {PG_12, UART_6, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_USART6)},
+    {NC,    NC,     0}
+};
+
+const PinMap PinMap_UART_CTS[] = {
+//  {PA_0,  UART_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART2)}, // Connected to BUTTON
+    {PA_11, UART_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)},
+    {PB_13, UART_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART3)},
+    {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_USART3)},
+//  {PG_13, UART_6, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_USART6)}, // Connected to LED
+    {PG_15, UART_6, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_USART6)},
+    {NC,    NC,     0}
+};
+ 
 //*** SPI ***
 
 const PinMap PinMap_SPI_MOSI[] = {
diff --git a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_DISCO_F429ZI/objects.h b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_DISCO_F429ZI/objects.h
index 8907aeb0c0b..bd27e9d27d4 100644
--- a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_DISCO_F429ZI/objects.h
+++ b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_DISCO_F429ZI/objects.h
@@ -74,6 +74,11 @@ 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 {
diff --git a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_DISCO_F469NI/PeripheralPins.c b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_DISCO_F469NI/PeripheralPins.c
index bcfb3af59e7..e57b41dd59f 100644
--- a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_DISCO_F469NI/PeripheralPins.c
+++ b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_DISCO_F469NI/PeripheralPins.c
@@ -232,6 +232,28 @@ 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)},
+    {PB_14, UART_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART3)},
+    {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_USART3)},
+    {PG_8,  UART_6, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_USART6)},
+    {PG_12, UART_6, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_USART6)},
+    {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_13, UART_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART3)},
+    {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_USART3)},
+    {PG_13, UART_6, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_USART6)},
+    {PG_15, UART_6, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_USART6)},
+    {NC,    NC,     0}
+};
+ 
 //*** SPI ***
 
 const PinMap PinMap_SPI_MOSI[] = {
diff --git a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_DISCO_F469NI/objects.h b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_DISCO_F469NI/objects.h
index 98a6603e5b4..dd4528b9597 100644
--- a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_DISCO_F469NI/objects.h
+++ b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_DISCO_F469NI/objects.h
@@ -74,6 +74,11 @@ 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 {
diff --git a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F410RB/PeripheralPins.c b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F410RB/PeripheralPins.c
index 07cd1f9d0dc..e8f49c22880 100644
--- a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F410RB/PeripheralPins.c
+++ b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F410RB/PeripheralPins.c
@@ -137,6 +137,18 @@ 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)},
+    {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)},
+    {NC,    NC,     0}
+};
+ 
 //*** SPI ***
 
 const PinMap PinMap_SPI_MOSI[] = {
diff --git a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F410RB/objects.h b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F410RB/objects.h
index 5e4b9377bef..1a5893764c0 100644
--- a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F410RB/objects.h
+++ b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F410RB/objects.h
@@ -74,6 +74,11 @@ 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 {
diff --git a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F411RE/PeripheralPins.c b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F411RE/PeripheralPins.c
index f1f50db2bda..5b729383768 100644
--- a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F411RE/PeripheralPins.c
+++ b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F411RE/PeripheralPins.c
@@ -151,6 +151,18 @@ 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)},
+    {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)},
+    {NC,    NC,     0}
+};
+ 
 //*** SPI ***
 
 const PinMap PinMap_SPI_MOSI[] = {
diff --git a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F411RE/objects.h b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F411RE/objects.h
index 85ca7538c0a..1dfee74a3be 100644
--- a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F411RE/objects.h
+++ b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F411RE/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 {
diff --git a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F429ZI/PeripheralPins.c b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F429ZI/PeripheralPins.c
index 575f57f9a85..98c52c02a38 100644
--- a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F429ZI/PeripheralPins.c
+++ b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F429ZI/PeripheralPins.c
@@ -236,6 +236,28 @@ 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)}, // (pin used by ethernet)
+//  {PA_12, UART_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)}, // (pin used by usb)
+//  {PB_14, UART_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART3)}, // (pin used by LED3)
+    {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_USART3)},
+    {PG_8,  UART_6, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_USART6)},
+    {PG_12, UART_6, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_USART6)},
+    {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)}, // (pin used by usb)
+    {PB_13, UART_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART3)}, // (pin used by ethernet when JP7 ON)
+    {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_USART3)},
+//  {PG_13, UART_6, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_USART6)}, // (pin used by ethernet)
+    {PG_15, UART_6, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_USART6)},
+    {NC,    NC,     0}
+};
+
 //*** SPI ***
 
 const PinMap PinMap_SPI_MOSI[] = {
diff --git a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F429ZI/objects.h b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F429ZI/objects.h
index 24203df4628..db945b28439 100644
--- a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F429ZI/objects.h
+++ b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F429ZI/objects.h
@@ -74,6 +74,11 @@ 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 {
diff --git a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F446RE/PeripheralPins.c b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F446RE/PeripheralPins.c
index af8f878a04c..53caab52c24 100644
--- a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F446RE/PeripheralPins.c
+++ b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F446RE/PeripheralPins.c
@@ -183,6 +183,24 @@ 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)},
+    {PC_8,  UART_5, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_UART5)},
+    {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)},
+    {NC,    NC,     0}
+};
+
 //*** SPI ***
 
 const PinMap PinMap_SPI_MOSI[] = {
diff --git a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F446RE/objects.h b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F446RE/objects.h
index 98a6603e5b4..dd4528b9597 100644
--- a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F446RE/objects.h
+++ b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F446RE/objects.h
@@ -74,6 +74,11 @@ 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 {
diff --git a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F446ZE/objects.h b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F446ZE/objects.h
index 98a6603e5b4..dd4528b9597 100644
--- a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F446ZE/objects.h
+++ b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/TARGET_NUCLEO_F446ZE/objects.h
@@ -74,6 +74,11 @@ 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 {