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Jay_Bolboli
Jay_Bolboli
Associate II
March 13, 2023
Question

Hello everyone, I am encountering an issue with UART1 while using STM32WL for LoRa Communication with SubGHz_Phy_Per and STM32WL-SubGHz-PhyBasic-Tx-Rx examples from the STM32 Github.

  • March 13, 2023
  • 3 replies
  • 1014 views

In my application, I receive a message from LoRa and intend to transmit it via UART1 which is set to PA9 and PA10. However, when I check the UART RX using a logic analyzer, I do not receive anything.

I have tested the UART1 alone in a simple project, and it works fine. But, when I integrate UART1 into the SubGHz_Phy_Per and STM32WL-SubGHz-PhyBasic-Tx-Rx examples, it does not work.

I have added HAL-UART to the OnTxDone function, main function, and other parts of the code, but the issue persists. Can someone please suggest a solution to this problem?

#[UART/USART]​ #LoRa​ #STM32WL​ 

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3 replies

Tesla DeLorean
Tesla DeLorean
Guru
March 13, 2023

The solution would be to debug the problem, looking at peripheral and clock settings. Be sure to clear any errors and status, like noise or framing errors.

I would not put any blocking code in the call backs, but rather use buffering.​

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Jay_Bolboli
Jay_BolboliAuthor
Associate II
March 14, 2023

Dear Tesla DeLorean,

Thank you for your previous response. I followed your recommendations, checked the peripheral and clock settings, and cleared any errors, but the issue persists.

Interestingly, I found that when I am in debug mode, the UART1 works fine, but when I'm not in debug mode, it doesn't work as expected.

I appreciate any additional insights or suggestions you may have.

Jay_Bolboli
Jay_BolboliAuthor
Associate II
March 15, 2023

Update on the problem:

I have successfully solved the issue with the STM32WL-SubGHz-PhyBasic-Tx-Rx examples by noticing that the UART1 clock was not active while i activated it. After importing the project again, the project worked properly.

However, the issue still persists with the SubGHz_Phy_Per example. Interestingly, I found that the UART1 works fine when I am in debug mode, but not when I'm not in debug mode. I even added some hal-delay to check if the problem was due to timing, but there was no change.

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