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Q
quanngo
Visitor II
January 16, 2025
Solved

STM32L053 GPIO Outputs not working

  • January 16, 2025
  • 2 replies
  • 961 views

Hi,

We have a custom design based on STM32L053C8U8 with the pinout mapping  as image attached. The GPIOs setting and initialization code is generated by STM32CubeIDE version 1.17.0 and companion CubeMX . however, the GPIO level the output pins are not in line with the firmware control using HAL_GPIO_WritePin(). for example, HAL_GPIO_WritePin(GPIOA, GPIO_PIN_11, GPIO_PIN_RESET) won't sew the PA11 to LOW. 

The initialization code is attached. 

What's wrong? thanks in advance and appreciate your responses!

 

 

quanngo_0-1737057327704.png

 



    This topic has been closed for replies.
    Best answer by quanngo

    It's resolved. For those who will see the same problem, this is due to the fact that VDD_USB pin of the STM32L053C8 did not pull up resulting PA11 (and PA12) are not usable.

     

    2 replies

    G
    gbm
    Graduate
    January 16, 2025

    Make sure that BOOT0 pin is at logic 0 level.

      Q
      quanngoAuthor
      Visitor II
      January 16, 2025

      BOOT0 is at 0. btw, the firmware is running but the gpio output is not as expected.

      T
      Tesla DeLorean
      Graduate II
      January 16, 2025

      Then debug...

      Start by checking the clocks in the RCC, then the pin/bank initialization in the GPIOx peripherals.

      If it's running your code you should be able step through it, set break points and inspect memory/peripherals

      W
      waclawek.jan
      Super User
      January 16, 2025

      Read out and check/post content of GPIOA registers.

      What is connected to PA11? How do you measure it? Did you measure it directly at the chip's pin?

      JW

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