diff -ur cubemx-f4discovery-cc256x-orig/.cproject cubemx-f4discovery-cc256x/.cproject
--- cubemx-f4discovery-cc256x-orig/.cproject	2017-05-04 11:31:15.000000000 +0200
+++ cubemx-f4discovery-cc256x/.cproject	2017-05-04 11:31:15.000000000 +0200
@@ -33,7 +33,7 @@
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+								<option id="gnu.c.compiler.option.include.paths.180086060" name="Include paths (-I)" superClass="gnu.c.compiler.option.include.paths" useByScannerDiscovery="false" valueType="includePath"><listOptionValue builtIn="false" value="../Inc" /><listOptionValue builtIn="false" value="../Drivers/STM32F4xx_HAL_Driver/Inc" /><listOptionValue builtIn="false" value="../Drivers/STM32F4xx_HAL_Driver/Inc/Legacy" /><listOptionValue builtIn="false" value="../Drivers/CMSIS/Device/ST/STM32F4xx/Include" /><listOptionValue builtIn="false" value="../Drivers/CMSIS/Include" /><listOptionValue builtIn="false" value="../Inc" /></option>
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@@ -103,7 +103,7 @@
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diff -ur cubemx-f4discovery-cc256x-orig/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_uart.c cubemx-f4discovery-cc256x/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_uart.c
--- cubemx-f4discovery-cc256x-orig/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_uart.c	2017-05-04 11:31:15.000000000 +0200
+++ cubemx-f4discovery-cc256x/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_uart.c	2017-05-04 11:52:20.000000000 +0200
@@ -974,8 +974,12 @@
     tmp = (uint32_t*)&pData;
     HAL_DMA_Start_IT(huart->hdmarx, (uint32_t)&huart->Instance->DR, *(uint32_t*)tmp, Size);
 
-    /* Clear the Overrun flag just before enabling the DMA Rx request: can be mandatory for the second transfer */
-    __HAL_UART_CLEAR_OREFLAG(huart);
+    //
+    //  BK: __HAL_UART_CLEAR_OREFLAG (also) reads Data Register -> loosing an already received byte
+    //
+    //  /* Clear the Overrun flag just before enabling the DMA Rx request: can be mandatory for the second transfer */
+    //  __HAL_UART_CLEAR_OREFLAG(huart);
+    //
 
     /* Process Unlocked */
     __HAL_UNLOCK(huart);
diff -ur cubemx-f4discovery-cc256x-orig/Src/main.c cubemx-f4discovery-cc256x/Src/main.c
--- cubemx-f4discovery-cc256x-orig/Src/main.c	2017-05-04 11:31:15.000000000 +0200
+++ cubemx-f4discovery-cc256x/Src/main.c	2017-05-04 11:54:03.000000000 +0200
@@ -37,6 +37,8 @@
 #include "usart.h"
 #include "gpio.h"
 
+#include "port.h"
+
 /* USER CODE BEGIN Includes */
 
 /* USER CODE END Includes */
@@ -82,21 +84,10 @@
   MX_USART2_UART_Init();
   MX_USART3_UART_Init();
 
-  /* USER CODE BEGIN 2 */
-
-  /* USER CODE END 2 */
-
-  /* Infinite loop */
-  /* USER CODE BEGIN WHILE */
-  while (1)
-  {
-  /* USER CODE END WHILE */
-
-  /* USER CODE BEGIN 3 */
-
-  }
-  /* USER CODE END 3 */
+  // jump to BTstack port
+  port_main();
 
+  while (1);
 }
 
 /** System Clock Configuration
Only in cubemx-f4discovery-cc256x: cubemx-f4discovery-cc256x.patch