diff --git a/hw/bsp/circuitplayground_bluefruit/circuitplayground_bluefruit.c b/hw/bsp/circuitplayground_bluefruit/circuitplayground_bluefruit.c
index 59085fe97..30742ab9f 100644
--- a/hw/bsp/circuitplayground_bluefruit/circuitplayground_bluefruit.c
+++ b/hw/bsp/circuitplayground_bluefruit/circuitplayground_bluefruit.c
@@ -125,15 +125,13 @@ uint32_t board_button_read(void)
 
 int board_uart_read(uint8_t* buf, int len)
 {
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
 int board_uart_write(void const * buf, int len)
 {
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
diff --git a/hw/bsp/circuitplayground_express/circuitplayground_express.c b/hw/bsp/circuitplayground_express/circuitplayground_express.c
index 355e15d39..6ca584eb3 100644
--- a/hw/bsp/circuitplayground_express/circuitplayground_express.c
+++ b/hw/bsp/circuitplayground_express/circuitplayground_express.c
@@ -116,6 +116,18 @@ uint32_t board_button_read(void)
   return gpio_get_pin_level(BUTTON_PIN);
 }
 
+int board_uart_read(uint8_t* buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
+int board_uart_write(void const * buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
 #if CFG_TUSB_OS  == OPT_OS_NONE
 volatile uint32_t system_ticks = 0;
 void SysTick_Handler (void)
diff --git a/hw/bsp/ea4088qs/ea4088qs.c b/hw/bsp/ea4088qs/ea4088qs.c
index 4e9f930d2..8adb61fda 100644
--- a/hw/bsp/ea4088qs/ea4088qs.c
+++ b/hw/bsp/ea4088qs/ea4088qs.c
@@ -131,16 +131,14 @@ uint32_t board_button_read(void)
 int board_uart_read(uint8_t* buf, int len)
 {
   //return UART_ReceiveByte(BOARD_UART_PORT);
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
 int board_uart_write(void const * buf, int len)
 {
   //UART_Send(BOARD_UART_PORT, &c, 1, BLOCKING);
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
diff --git a/hw/bsp/ea4357/ea4357.c b/hw/bsp/ea4357/ea4357.c
index df80815d8..c276f10d3 100644
--- a/hw/bsp/ea4357/ea4357.c
+++ b/hw/bsp/ea4357/ea4357.c
@@ -254,16 +254,14 @@ uint32_t board_button_read(void)
 int board_uart_read(uint8_t* buf, int len)
 {
   //return UART_ReceiveByte(BOARD_UART_PORT);
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
 int board_uart_write(void const * buf, int len)
 {
   //UART_Send(BOARD_UART_PORT, &c, 1, BLOCKING);
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
diff --git a/hw/bsp/feather_m0_express/feather_m0_express.c b/hw/bsp/feather_m0_express/feather_m0_express.c
index 17576bb5a..35505add9 100644
--- a/hw/bsp/feather_m0_express/feather_m0_express.c
+++ b/hw/bsp/feather_m0_express/feather_m0_express.c
@@ -116,6 +116,18 @@ uint32_t board_button_read(void)
   return gpio_get_pin_level(BUTTON_PIN) ? 0 : 1;
 }
 
+int board_uart_read(uint8_t* buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
+int board_uart_write(void const * buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
 #if CFG_TUSB_OS  == OPT_OS_NONE
 volatile uint32_t system_ticks = 0;
 void SysTick_Handler (void)
diff --git a/hw/bsp/feather_m4_express/feather_m4_express.c b/hw/bsp/feather_m4_express/feather_m4_express.c
index a368b3038..fccd0d3af 100644
--- a/hw/bsp/feather_m4_express/feather_m4_express.c
+++ b/hw/bsp/feather_m4_express/feather_m4_express.c
@@ -105,6 +105,18 @@ uint32_t board_button_read(void)
   return gpio_get_pin_level(BUTTON_PIN) ? 0 : 1;
 }
 
+int board_uart_read(uint8_t* buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
+int board_uart_write(void const * buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
 #if CFG_TUSB_OS  == OPT_OS_NONE
 volatile uint32_t system_ticks = 0;
 
diff --git a/hw/bsp/feather_nrf52840_express/feather_nrf52840_express.c b/hw/bsp/feather_nrf52840_express/feather_nrf52840_express.c
index ed3954c82..24cc3cf2f 100644
--- a/hw/bsp/feather_nrf52840_express/feather_nrf52840_express.c
+++ b/hw/bsp/feather_nrf52840_express/feather_nrf52840_express.c
@@ -125,15 +125,13 @@ uint32_t board_button_read(void)
 
 int board_uart_read(uint8_t* buf, int len)
 {
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
 int board_uart_write(void const * buf, int len)
 {
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
diff --git a/hw/bsp/feather_stm32f405/feather_stm32f405.c b/hw/bsp/feather_stm32f405/feather_stm32f405.c
index 02c33a0a8..0bc40ece0 100644
--- a/hw/bsp/feather_stm32f405/feather_stm32f405.c
+++ b/hw/bsp/feather_stm32f405/feather_stm32f405.c
@@ -172,6 +172,18 @@ uint32_t board_button_read(void)
   return BUTTON_STATE_ACTIVE == HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
 }
 
+int board_uart_read(uint8_t* buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
+int board_uart_write(void const * buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
 #if CFG_TUSB_OS  == OPT_OS_NONE
 volatile uint32_t system_ticks = 0;
 void SysTick_Handler (void)
diff --git a/hw/bsp/lpcxpresso11u37/lpcxpresso11u37.c b/hw/bsp/lpcxpresso11u37/lpcxpresso11u37.c
index f7fc16ec2..546dd3d13 100644
--- a/hw/bsp/lpcxpresso11u37/lpcxpresso11u37.c
+++ b/hw/bsp/lpcxpresso11u37/lpcxpresso11u37.c
@@ -173,15 +173,13 @@ uint32_t board_button_read(void)
 
 int board_uart_read(uint8_t* buf, int len)
 {
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
 int board_uart_write(void const * buf, int len)
 {
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
diff --git a/hw/bsp/lpcxpresso11u68/lpcxpresso11u68.c b/hw/bsp/lpcxpresso11u68/lpcxpresso11u68.c
index 4f0194972..d062de7c3 100644
--- a/hw/bsp/lpcxpresso11u68/lpcxpresso11u68.c
+++ b/hw/bsp/lpcxpresso11u68/lpcxpresso11u68.c
@@ -100,15 +100,13 @@ uint32_t board_button_read(void)
 
 int board_uart_read(uint8_t* buf, int len)
 {
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
 int board_uart_write(void const * buf, int len)
 {
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
diff --git a/hw/bsp/lpcxpresso1347/lpcxpresso1347.c b/hw/bsp/lpcxpresso1347/lpcxpresso1347.c
index d389eb798..cc1a8deae 100644
--- a/hw/bsp/lpcxpresso1347/lpcxpresso1347.c
+++ b/hw/bsp/lpcxpresso1347/lpcxpresso1347.c
@@ -130,14 +130,12 @@ uint32_t board_button_read(void)
 
 int board_uart_read(uint8_t* buf, int len)
 {
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
 int board_uart_write(void const * buf, int len)
 {
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
diff --git a/hw/bsp/lpcxpresso1549/lpcxpresso1549.c b/hw/bsp/lpcxpresso1549/lpcxpresso1549.c
index e10e24020..5f806d851 100644
--- a/hw/bsp/lpcxpresso1549/lpcxpresso1549.c
+++ b/hw/bsp/lpcxpresso1549/lpcxpresso1549.c
@@ -113,14 +113,12 @@ uint32_t board_button_read(void)
 
 int board_uart_read(uint8_t* buf, int len)
 {
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
 int board_uart_write(void const * buf, int len)
 {
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
diff --git a/hw/bsp/lpcxpresso1769/lpcxpresso1769.c b/hw/bsp/lpcxpresso1769/lpcxpresso1769.c
index 13b8fc9ff..e2d5f6cf2 100644
--- a/hw/bsp/lpcxpresso1769/lpcxpresso1769.c
+++ b/hw/bsp/lpcxpresso1769/lpcxpresso1769.c
@@ -160,16 +160,14 @@ uint32_t board_button_read(void)
 int board_uart_read(uint8_t* buf, int len)
 {
 //  return UART_ReceiveByte(BOARD_UART_PORT);
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
 int board_uart_write(void const * buf, int len)
 {
 //  UART_Send(BOARD_UART_PORT, &c, 1, BLOCKING);
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
diff --git a/hw/bsp/lpcxpresso51u68/lpcxpresso51u68.c b/hw/bsp/lpcxpresso51u68/lpcxpresso51u68.c
index df915a720..11b190b92 100644
--- a/hw/bsp/lpcxpresso51u68/lpcxpresso51u68.c
+++ b/hw/bsp/lpcxpresso51u68/lpcxpresso51u68.c
@@ -144,15 +144,13 @@ uint32_t board_button_read(void)
 
 int board_uart_read(uint8_t* buf, int len)
 {
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
 int board_uart_write(void const * buf, int len)
 {
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
diff --git a/hw/bsp/lpcxpresso54114/lpcxpresso54114.c b/hw/bsp/lpcxpresso54114/lpcxpresso54114.c
index 090c1a95e..d86af58c8 100644
--- a/hw/bsp/lpcxpresso54114/lpcxpresso54114.c
+++ b/hw/bsp/lpcxpresso54114/lpcxpresso54114.c
@@ -145,15 +145,13 @@ uint32_t board_button_read(void)
 
 int board_uart_read(uint8_t* buf, int len)
 {
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
 int board_uart_write(void const * buf, int len)
 {
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
diff --git a/hw/bsp/lpcxpresso55s69/lpcxpresso55s69.c b/hw/bsp/lpcxpresso55s69/lpcxpresso55s69.c
index 41e3028f1..e595634a7 100644
--- a/hw/bsp/lpcxpresso55s69/lpcxpresso55s69.c
+++ b/hw/bsp/lpcxpresso55s69/lpcxpresso55s69.c
@@ -187,15 +187,13 @@ uint32_t board_button_read(void)
 
 int board_uart_read(uint8_t* buf, int len)
 {
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
 int board_uart_write(void const * buf, int len)
 {
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
diff --git a/hw/bsp/mbed1768/mbed1768.c b/hw/bsp/mbed1768/mbed1768.c
index 647334a42..9f1ed12ef 100644
--- a/hw/bsp/mbed1768/mbed1768.c
+++ b/hw/bsp/mbed1768/mbed1768.c
@@ -152,16 +152,14 @@ uint32_t board_button_read(void)
 int board_uart_read(uint8_t* buf, int len)
 {
 //  return UART_ReceiveByte(BOARD_UART_PORT);
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
 int board_uart_write(void const * buf, int len)
 {
 //  UART_Send(BOARD_UART_PORT, &c, 1, BLOCKING);
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
diff --git a/hw/bsp/mcb1800/mcb1800.c b/hw/bsp/mcb1800/mcb1800.c
index 44f5b11bb..deb17f113 100644
--- a/hw/bsp/mcb1800/mcb1800.c
+++ b/hw/bsp/mcb1800/mcb1800.c
@@ -28,14 +28,13 @@
 #include "../board.h"
 
 // PD_10
-#define LED_PORT  6
-#define LED_PIN   24
+#define LED_PORT      6
+#define LED_PIN       24
 
 // P4_0
 #define BUTTON_PORT   2
 #define BUTTON_PIN    0
 
-
 //--------------------------------------------------------------------+
 // MACRO TYPEDEF CONSTANT ENUM DECLARATION
 //--------------------------------------------------------------------+
@@ -191,16 +190,14 @@ uint32_t board_button_read(void)
 int board_uart_read(uint8_t* buf, int len)
 {
   //return UART_ReceiveByte(BOARD_UART_PORT);
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
 int board_uart_write(void const * buf, int len)
 {
   //UART_Send(BOARD_UART_PORT, &c, 1, BLOCKING);
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
diff --git a/hw/bsp/metro_m0_express/metro_m0_express.c b/hw/bsp/metro_m0_express/metro_m0_express.c
index 17576bb5a..35505add9 100644
--- a/hw/bsp/metro_m0_express/metro_m0_express.c
+++ b/hw/bsp/metro_m0_express/metro_m0_express.c
@@ -116,6 +116,18 @@ uint32_t board_button_read(void)
   return gpio_get_pin_level(BUTTON_PIN) ? 0 : 1;
 }
 
+int board_uart_read(uint8_t* buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
+int board_uart_write(void const * buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
 #if CFG_TUSB_OS  == OPT_OS_NONE
 volatile uint32_t system_ticks = 0;
 void SysTick_Handler (void)
diff --git a/hw/bsp/metro_m4_express/metro_m4_express.c b/hw/bsp/metro_m4_express/metro_m4_express.c
index 583a4dfe6..08559e57c 100644
--- a/hw/bsp/metro_m4_express/metro_m4_express.c
+++ b/hw/bsp/metro_m4_express/metro_m4_express.c
@@ -105,6 +105,18 @@ uint32_t board_button_read(void)
   return gpio_get_pin_level(BUTTON_PIN) ? 0 : 1;
 }
 
+int board_uart_read(uint8_t* buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
+int board_uart_write(void const * buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
 #if CFG_TUSB_OS  == OPT_OS_NONE
 volatile uint32_t system_ticks = 0;
 
diff --git a/hw/bsp/ngx4330/ngx4330.c b/hw/bsp/ngx4330/ngx4330.c
index 609b4dac6..669180026 100644
--- a/hw/bsp/ngx4330/ngx4330.c
+++ b/hw/bsp/ngx4330/ngx4330.c
@@ -236,16 +236,14 @@ uint32_t board_button_read(void)
 int board_uart_read(uint8_t* buf, int len)
 {
   //return UART_ReceiveByte(BOARD_UART_PORT);
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
 int board_uart_write(void const * buf, int len)
 {
   //UART_Send(BOARD_UART_PORT, &c, 1, BLOCKING);
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
diff --git a/hw/bsp/pca10056/pca10056.c b/hw/bsp/pca10056/pca10056.c
index fa7d6fc71..31fd5e9be 100644
--- a/hw/bsp/pca10056/pca10056.c
+++ b/hw/bsp/pca10056/pca10056.c
@@ -154,8 +154,7 @@ uint32_t board_button_read(void)
 
 int board_uart_read(uint8_t* buf, int len)
 {
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 //  return NRFX_SUCCESS == nrfx_uart_rx(&_uart_id, buf, (size_t) len) ? len : 0;
 }
diff --git a/hw/bsp/pca10059/pca10059.c b/hw/bsp/pca10059/pca10059.c
index b18c1d231..69246f4a6 100644
--- a/hw/bsp/pca10059/pca10059.c
+++ b/hw/bsp/pca10059/pca10059.c
@@ -123,15 +123,13 @@ uint32_t board_button_read(void)
 
 int board_uart_read(uint8_t* buf, int len)
 {
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
 int board_uart_write(void const * buf, int len)
 {
-  (void) buf;
-  (void) len;
+  (void) buf; (void) len;
   return 0;
 }
 
diff --git a/hw/bsp/pyboardv11/pyboardv11.c b/hw/bsp/pyboardv11/pyboardv11.c
index 85c0eb58f..2d4c732cc 100644
--- a/hw/bsp/pyboardv11/pyboardv11.c
+++ b/hw/bsp/pyboardv11/pyboardv11.c
@@ -174,6 +174,18 @@ uint32_t board_button_read(void)
   return BUTTON_STATE_ACTIVE == HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
 }
 
+int board_uart_read(uint8_t* buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
+int board_uart_write(void const * buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
 #if CFG_TUSB_OS  == OPT_OS_NONE
 volatile uint32_t system_ticks = 0;
 void SysTick_Handler (void)
diff --git a/hw/bsp/stm32f070rbnucleo/stm32f070rbnucleo.c b/hw/bsp/stm32f070rbnucleo/stm32f070rbnucleo.c
index 6ee73bcc2..e51eda927 100644
--- a/hw/bsp/stm32f070rbnucleo/stm32f070rbnucleo.c
+++ b/hw/bsp/stm32f070rbnucleo/stm32f070rbnucleo.c
@@ -109,6 +109,18 @@ uint32_t board_button_read(void)
   return BUTTON_STATE_ACTIVE == HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
 }
 
+int board_uart_read(uint8_t* buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
+int board_uart_write(void const * buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
 #if CFG_TUSB_OS  == OPT_OS_NONE
 volatile uint32_t system_ticks = 0;
 void SysTick_Handler (void)
diff --git a/hw/bsp/stm32f072disco/stm32f072disco.c b/hw/bsp/stm32f072disco/stm32f072disco.c
index 2faa00db9..46cb09490 100644
--- a/hw/bsp/stm32f072disco/stm32f072disco.c
+++ b/hw/bsp/stm32f072disco/stm32f072disco.c
@@ -131,6 +131,18 @@ uint32_t board_button_read(void)
   return BUTTON_STATE_ACTIVE == HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
 }
 
+int board_uart_read(uint8_t* buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
+int board_uart_write(void const * buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
 #if CFG_TUSB_OS  == OPT_OS_NONE
 volatile uint32_t system_ticks = 0;
 void SysTick_Handler (void)
diff --git a/hw/bsp/stm32f103bluepill/stm32f103bluepill.c b/hw/bsp/stm32f103bluepill/stm32f103bluepill.c
index aade44d35..24c898c84 100644
--- a/hw/bsp/stm32f103bluepill/stm32f103bluepill.c
+++ b/hw/bsp/stm32f103bluepill/stm32f103bluepill.c
@@ -139,6 +139,18 @@ uint32_t board_button_read(void)
   return BUTTON_STATE_ACTIVE == HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
 }
 
+int board_uart_read(uint8_t* buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
+int board_uart_write(void const * buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
 #if CFG_TUSB_OS  == OPT_OS_NONE
 volatile uint32_t system_ticks = 0;
 void SysTick_Handler (void)
diff --git a/hw/bsp/stm32f207nucleo/stm32f207nucleo.c b/hw/bsp/stm32f207nucleo/stm32f207nucleo.c
index c313ed9f5..de0b4753b 100644
--- a/hw/bsp/stm32f207nucleo/stm32f207nucleo.c
+++ b/hw/bsp/stm32f207nucleo/stm32f207nucleo.c
@@ -152,6 +152,18 @@ uint32_t board_button_read(void)
   return BUTTON_STATE_ACTIVE == HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
 }
 
+int board_uart_read(uint8_t* buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
+int board_uart_write(void const * buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
 #if CFG_TUSB_OS  == OPT_OS_NONE
 volatile uint32_t system_ticks = 0;
 void SysTick_Handler (void)
diff --git a/hw/bsp/stm32f303disco/stm32f303disco.c b/hw/bsp/stm32f303disco/stm32f303disco.c
index ae369ed5b..d6d97a531 100644
--- a/hw/bsp/stm32f303disco/stm32f303disco.c
+++ b/hw/bsp/stm32f303disco/stm32f303disco.c
@@ -143,6 +143,18 @@ uint32_t board_button_read(void)
   return BUTTON_STATE_ACTIVE == HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
 }
 
+int board_uart_read(uint8_t* buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
+int board_uart_write(void const * buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
 #if CFG_TUSB_OS  == OPT_OS_NONE
 volatile uint32_t system_ticks = 0;
 void SysTick_Handler (void)
diff --git a/hw/bsp/stm32f407disco/stm32f407disco.c b/hw/bsp/stm32f407disco/stm32f407disco.c
index 16cec3e9a..b80c5c1b3 100644
--- a/hw/bsp/stm32f407disco/stm32f407disco.c
+++ b/hw/bsp/stm32f407disco/stm32f407disco.c
@@ -169,6 +169,18 @@ uint32_t board_button_read(void)
   return BUTTON_STATE_ACTIVE == HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
 }
 
+int board_uart_read(uint8_t* buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
+int board_uart_write(void const * buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
 #if CFG_TUSB_OS  == OPT_OS_NONE
 volatile uint32_t system_ticks = 0;
 void SysTick_Handler (void)
diff --git a/hw/bsp/stm32f411disco/stm32f411disco.c b/hw/bsp/stm32f411disco/stm32f411disco.c
index ce8753432..d8d79d2f0 100644
--- a/hw/bsp/stm32f411disco/stm32f411disco.c
+++ b/hw/bsp/stm32f411disco/stm32f411disco.c
@@ -168,6 +168,18 @@ uint32_t board_button_read(void)
   return BUTTON_STATE_ACTIVE == HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
 }
 
+int board_uart_read(uint8_t* buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
+int board_uart_write(void const * buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
 #if CFG_TUSB_OS  == OPT_OS_NONE
 volatile uint32_t system_ticks = 0;
 void SysTick_Handler (void)
diff --git a/hw/bsp/stm32f412disco/stm32f412disco.c b/hw/bsp/stm32f412disco/stm32f412disco.c
index 0a3ae7365..8d93013c1 100644
--- a/hw/bsp/stm32f412disco/stm32f412disco.c
+++ b/hw/bsp/stm32f412disco/stm32f412disco.c
@@ -195,6 +195,18 @@ uint32_t board_button_read(void)
   return BUTTON_STATE_ACTIVE == HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
 }
 
+int board_uart_read(uint8_t* buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
+int board_uart_write(void const * buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
 #if CFG_TUSB_OS  == OPT_OS_NONE
 volatile uint32_t system_ticks = 0;
 void SysTick_Handler (void)
diff --git a/hw/bsp/stm32l0538disco/stm32l0538disco.c b/hw/bsp/stm32l0538disco/stm32l0538disco.c
index a3daaf0d2..6b0222ea0 100644
--- a/hw/bsp/stm32l0538disco/stm32l0538disco.c
+++ b/hw/bsp/stm32l0538disco/stm32l0538disco.c
@@ -161,6 +161,18 @@ uint32_t board_button_read(void)
   return BUTTON_STATE_ACTIVE == HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
 }
 
+int board_uart_read(uint8_t* buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
+int board_uart_write(void const * buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
 #if CFG_TUSB_OS  == OPT_OS_NONE
 volatile uint32_t system_ticks = 0;
 void SysTick_Handler (void)
diff --git a/hw/bsp/stm32l476disco/stm32l476disco.c b/hw/bsp/stm32l476disco/stm32l476disco.c
index 8e01814c6..a4cad68bb 100644
--- a/hw/bsp/stm32l476disco/stm32l476disco.c
+++ b/hw/bsp/stm32l476disco/stm32l476disco.c
@@ -182,6 +182,18 @@ uint32_t board_button_read(void)
   return BUTTON_STATE_ACTIVE == HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
 }
 
+int board_uart_read(uint8_t* buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
+int board_uart_write(void const * buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
 #if CFG_TUSB_OS  == OPT_OS_NONE
 volatile uint32_t system_ticks = 0;
 void SysTick_Handler (void)