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SWall.2
SWall.2
Associate III
November 29, 2020
Question

How does the USART 2 transmit signal output from pins PA2 and GND to a logic analyser?

  • November 29, 2020
  • 2 replies
  • 2966 views

I am having a little difficulty getting a USART 2 signal to output to a logic analyser using transmit Tx serial asynchronous communication. I have configured a USART 2 peripheral to communicate through a DMA. The GPIO pin PA2 is outputting a constant logic one, so I am guessing I have missed something on the STML476VG DISCO microcontroller. I have tried to set the LSE clock to 32.768 kHz to no success. I have the low power sleep mode HAL driver configured in the source code. I have tried to change the parity setting in the IDE to even, but no luck.

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2 replies

TDK
TDK
November 29, 2020

UART sends signals with a pattern of 0s and 1s. If you're not seeing any change in the level, it's not sending info (or you're not capturing it correctly).

Get it working in blocking mode first (HAL_UART_Transmit) then move up to DMA after that (HAL_UART_Transmit_DMA).

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SWall.2
SWall.2Author
Associate III
November 29, 2020

Thanks for getting back to me.I'll give the UART peripheral a go without the DMA and see if I can get a signal to transmit.Thanks again.

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