diff --git a/targets/TARGET_STM/TARGET_STM32WB/TARGET_STM32WB5MxG/TARGET_DISCO_WB5MMG/PinNames.h b/targets/TARGET_STM/TARGET_STM32WB/TARGET_STM32WB5MxG/TARGET_DISCO_WB5MMG/PinNames.h
index 94a74c4..06adcef 100644
--- a/targets/TARGET_STM/TARGET_STM32WB/TARGET_STM32WB5MxG/TARGET_DISCO_WB5MMG/PinNames.h
+++ b/targets/TARGET_STM/TARGET_STM32WB/TARGET_STM32WB5MxG/TARGET_DISCO_WB5MMG/PinNames.h
@@ -27,6 +27,13 @@
 extern "C" {
 #endif
 
+void rgb_led_on(uint8_t RedValue, uint8_t GreenValue, uint8_t BlueValue);
+void rgb_led_off(void);
+void rgb_led_red(void);
+void rgb_led_green(void);
+void rgb_led_blue(void);
+
+
 typedef enum {
     ALT0  = 0x100,
 } ALTx;
@@ -185,10 +192,13 @@
 } PinName;
 
 // Standardized LED and button names
-#define LED1     PA_7  // LD4 is a RGB LED connected to a PWM LED driver // TODO
 #define BUTTON1  PC_12
 #define BUTTON2  PC_13
 
+// RBG LED
+#define RGB_LED       PA_7  // LD4 is a RGB LED connected to a PWM LED driver
+#define GPIO_SELECT2  PH_1  // See User Manual
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/targets/TARGET_STM/TARGET_STM32WB/TARGET_STM32WB5MxG/TARGET_DISCO_WB5MMG/Rgb_led.cpp b/targets/TARGET_STM/TARGET_STM32WB/TARGET_STM32WB5MxG/TARGET_DISCO_WB5MMG/Rgb_led.cpp
new file mode 100644
index 0000000..ac48397
--- /dev/null
+++ b/targets/TARGET_STM/TARGET_STM32WB/TARGET_STM32WB5MxG/TARGET_DISCO_WB5MMG/Rgb_led.cpp
@@ -0,0 +1,141 @@
+/* mbed Microcontroller Library
+ * SPDX-License-Identifier: BSD-3-Clause
+ ******************************************************************************
+ *
+ * Copyright (c) 2021 STMicroelectronics.
+ * All rights reserved.
+ *
+ * This software component is licensed by ST under BSD 3-Clause license,
+ * the "License"; You may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at:
+ *                        opensource.org/licenses/BSD-3-Clause
+ *
+ ******************************************************************************
+ */
+
+/* application example
+
+#include "mbed.h"
+
+int main()
+{
+    while (true) {
+        rgb_led_off();
+        ThisThread::sleep_for(2s);
+
+        rgb_led_red();
+        ThisThread::sleep_for(2s);
+
+        rgb_led_green();
+        ThisThread::sleep_for(2s);
+
+        rgb_led_blue();
+        ThisThread::sleep_for(2s);
+
+        rgb_led_on(0x41, 0x41, 0);    // yellow
+        ThisThread::sleep_for(2s);
+
+        rgb_led_on(0x41, 0, 0x41);    // magenta
+        ThisThread::sleep_for(2s);
+
+        rgb_led_on(0, 0x41, 0x41);    // cyan
+        ThisThread::sleep_for(2s);
+
+        rgb_led_on(0x41, 0x41, 0x41); // white
+        ThisThread::sleep_for(2s);
+    }
+}
+*/
+
+#include "drivers/DigitalOut.h"
+#include "platform/mbed_wait_api.h"
+
+
+#define DELAY          1
+#define T_CYCLE_0      4
+#define T_CYCLE_1      1
+#define WRITE_COMMAND  0x3A
+
+#define rgb_led_wait(NbCycles) wait_us(NbCycles * 10)
+
+
+void rgb_led_send_bit(uint8_t bit)
+{
+    mbed::DigitalOut RGB_LED_SDI(RGB_LED);
+
+    /* Start next cycle */
+    RGB_LED_SDI = 1;
+    rgb_led_wait(DELAY);
+    RGB_LED_SDI = 0;
+    rgb_led_wait(DELAY);
+
+    if (bit) {
+        RGB_LED_SDI = 1;
+        rgb_led_wait(DELAY);
+        RGB_LED_SDI = 0;
+        rgb_led_wait(T_CYCLE_1);
+    } else {
+        rgb_led_wait(T_CYCLE_0);
+    }
+}
+
+
+void rgb_led_send_byte(uint8_t byte)
+{
+    rgb_led_send_bit(byte & (1 << 7));
+    rgb_led_send_bit(byte & (1 << 6));
+    rgb_led_send_bit(byte & (1 << 5));
+    rgb_led_send_bit(byte & (1 << 4));
+    rgb_led_send_bit(byte & (1 << 3));
+    rgb_led_send_bit(byte & (1 << 2));
+    rgb_led_send_bit(byte & (1 << 1));
+    rgb_led_send_bit(byte & (1 << 0));
+}
+
+
+void rgb_led_on(uint8_t RedValue, uint8_t GreenValue, uint8_t BlueValue)
+{
+    mbed::DigitalOut RGB_SELECT(GPIO_SELECT2);
+    mbed::DigitalOut RGB_LED_SDI(RGB_LED);
+
+    RGB_SELECT = 1;
+
+    /* TCycle measurement sequence */
+    RGB_LED_SDI = 1;
+    rgb_led_wait(DELAY);
+    RGB_LED_SDI = 0;
+    rgb_led_wait(T_CYCLE_0);
+
+    /* Write command */
+    rgb_led_send_byte(WRITE_COMMAND);
+
+    /* Write the GS data */
+    rgb_led_send_byte(RedValue);
+    rgb_led_send_byte(GreenValue);
+    rgb_led_send_byte(BlueValue);
+
+    rgb_led_wait(T_CYCLE_0 * 2);
+
+    RGB_SELECT = 0;
+}
+
+void rgb_led_off(void)
+{
+    rgb_led_on(0, 0, 0);
+}
+
+void rgb_led_red(void)
+{
+    rgb_led_on(0x41, 0, 0);
+}
+
+void rgb_led_green(void)
+{
+    rgb_led_on(0, 0x41, 0);
+}
+
+void rgb_led_blue(void)
+{
+    rgb_led_on(0, 0, 0x41);
+}
+