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Eitan Michaelson
Eitan Michaelson
Visitor II
December 19, 2017
Question

STM32L4R9-EVAL UART Promblem

  • December 19, 2017
  • 2 replies
  • 736 views
Posted on December 19, 2017 at 12:48

Hello, I'm struggling to make (any of) the UART examples for the STM32L4R9-EVAL board work, so far without any success. Has any one here was able to get any data from the UART port (through the ST_Link interface) on this specific board?

Working With the latest Keil along with ST Cube version :

STM32Cube_FW_L4_V1.10.0

Thanks

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    2 replies

    Andrew Neil
    Andrew Neil
    Super User
    December 20, 2017
    Posted on December 20, 2017 at 10:02

    Have you determined whether any data is actually exiting the 

    STM32L4 chip?

    ie, is the problem in the chip, or in the ST-Link/PC ?

    (I don't know this specific board but, usually, the UART pins are accessible on a header).

    A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
    Tesla DeLorean
    Tesla DeLorean
    Guru
    December 21, 2017
    Posted on December 21, 2017 at 18:28

    The VCP should be accessible via USART3 and PB10/PB11, the RS232 via LPUART1 PG7,PG8

    GPIOG needs special initialization. LPUART1 needs a prescaler to hit 9600. Review initialization, and check not bombing into Error_Handler() or while(1) loop.

    GPIOB and USART3 should be straight forward.

    Have several UART working on the STM32L4R9I-DISCO, would need an EVAL to test code for that.

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