Freertos uart receive

[wyao75]

Hi

I use the SDK_2.2_TWR-K60D100M and try to use the freertos_uart.c on my TWR-K60D100M board to test receive data from UART. 

The program like this 

   UART_RTOS_Receive(&handle, recv_buffer, 20, &n);

   if(n==20)

      UART_RTOS_Send(&handle, (uint8_t *)recv_buffer, n);

Now, I use the labtop send data to TWR-K60D100M board.

I found when the program run to UART_RTOS_Receive(&handle, recv_buffer, 20, &n), the program is going to block state, when receive data over 20 and the program will active.

My question is how to let the UART_RTOS_Receive(&handle, recv_buffer, 20, &n) immediately return, rather than wait the received data over 20. 

[danielchen]

Hi 姚 &#29614

RTOS Uart driver is blocking the current task until whole required data are received. Please check the API UART_RTOS_Receive.

int UART_RTOS_Receive(uart_rtos_handle_t *handle, uint8_t *buffer, uint32_t length, size_t *received).

In your case, you specify the number of data words as 20. If you define the length as 1, the function will receive just 1 byte every time and return immediately.

Have a great day,
Daniel

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[chinagkuanyi]

I have same question, any update? I want receive non block data

[sreejithmenon]

What if i am streaming some data to the UART. I would like to use the RTOS UART DRIVER and process lets say 20 data word blocks, except that the last packet is only 8 words and i need to process it.Any suggestions as to how to handle this.

Thanks