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yang2
yang2
Associate III
July 1, 2016
Question

How to implement UART receive with unfixed data size?

  • July 1, 2016
  • 2 replies
  • 788 views
Posted on July 01, 2016 at 07:39

Hello all,

I use STM32F303VC and plant to use UART to receive data, but the receive size of data are different. Does anyone know how to implement it?

Thanks

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    2 replies

    slimen
    slimen
    Visitor II
    July 1, 2016
    Posted on July 01, 2016 at 10:27

    Hi,

    You can refer to the UART examples under 

    http://www.st.com/content/st_com/en/products/embedded-software/mcus-embedded-software/stm32-embedded-software/stm32cube-embedded-software/stm32cubef3.html

     package:

    STM32Cube_FW_F3_V1.5.0\Projects\STM32303C_EVAL\Examples\UART

    Regards

    AvaTar
    AvaTar
    Senior III
    July 1, 2016
    Posted on July 01, 2016 at 10:39

    Use single-character reception, if possible (RX interrupt).

    Use a receive buffer sufficient for the maximal message length, including some headroom.

    Check for buffer index range, message start character and message termination character, in that order.

    On start character, reset the buffer index to zero. On index overflow, too, but ignore the character.

    On message termination, copy the message immediately to a processing buffer for further checks/processing. Otherwise, new characters might start to overwrite it in the meantime.

    The reception and processing of Modbus-ASCII or GPS (NMEA183) are a good examples to google for.

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