Problems with USART2 Rx Callback with BLE_p2pServer_ota example

[ledi7]

Hi,

i am using the BLE_p2pServer_ota example with NUCLEOWBA55 and i want transmitt a 20 Byte package over USART2 with DMA in circular mode (19200 Baud). Here as an example, i send 20 bytes every second via HTerm to USART2. BLE advertising (every 2s) is working (but i am not connected to the cellphone app). 

The Rx Callback function is inside p2p_server_app.c and here i want to toggle the blue LED:

/* USER CODE BEGIN FD_LOCAL_FUNCTIONS*/
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
 if(huart->Instance == USART2)	// Rx Callback for USART2
 {
	BSP_LED_Toggle(LED_BLUE);
 }
/* USER CODE END FD_LOCAL_FUNCTIONS*/

But after several transmissions (between 50 and 150) the callback function is no longer called.

Does anyone have an idea what is going wrong?

[STTwo-32]

Hello @ledi7 

This is not a normal behavior. Could you please try to reproduce it on a simple Code (not inside the Example).

Best Regards.

STTwo-32

[ledi7]

I have created a new project from scratch and i am using USART2 with GPDMA in non-circular and circular mode. Also using 20 byte packets with 19200 baud and everything works fine.

 

[STTwo-32]

So, try to check in case the problem appears if the reception is really ended or not.

Best Regards.

STTwo-32

[Andrew Neil]

Are @ledi7 and @ledi001  related?

https://community.st.com/t5/stm32-mcus-wireless/hal-uart-rxcpltcallback-sometimes-not-called-in-dma-with-ble/td-p/763295

[ledi7]

 Yes, but now only under the account ledi7

[ledi001]

Duplicate - merged.

---

Hi,

I use the example “BLE_p2pServer_ota” with NUCLEO-WBA55 as a template for a project. Once a BLE connection is established with the mobile app, I start sending 20 bytes every 3 seconds via a hyperterminal on USART2 and transmitting it as a notification. The transmission basically works, but after a few transmissions (usually between 5 and 15 transmissions) the HAL_UART_RxCpltCallback function is no longer called. I have tried DMA in normal mode and in circular mode. In circular mode it works a bit longer.

1. in main.c i start the UART2 in DMA receive mode:

 

 

 /*##-2- Put UART peripheral in reception process ###########################*/
 /* Any data received will be stored in "aRxBuffer" buffer : the number max of
 data received is 20 */
 if (HAL_UART_Receive_DMA(&huart2, (uint8_t *)aRxBuffer, RXBUFFERSIZE) != HAL_OK)
 {
 //Transfer error in reception process
 Error_Handler();
 }

 

 

2. in Rx callback function i call the task to send a notification. (This is the same task which is used for button1 in the example)

 

 

/* USER CODE BEGIN 4 */
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
 if(huart->Instance == USART2) // Rx Callback for USART2 as soon as 20 bytes received
 {
	 UTIL_SEQ_SetTask( 1<<CFG_TASK_SEND_NOTIF_ID, CFG_SEQ_PRIO_0);
 }
}
/* USER CODE END 4 */

 

 

The task was called a few times but never longer as 15 times. 

How can i solve this problem?