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RonHreha · 2024-09-12

HelloI'm using the latest HAL library for STM32F030. I've set up a 512 byte transmit buffer for holding bytes that are to be transmitted out the UART using DMA in circular mode. The goal is to treat this 512 byte buffer as a circular transmit queue...

RonHreha · 2024-09-13

I think the issue is my interpretation of what a circular DMA does.In receive mode, the UART receive DMA running in DMA_CIRCULAR mode works almost exactly as I hoped it would. I've implemented a 512 byte receive buffer. I call HAL_UARTEx_ReceiveToI...

RonHreha · 2024-09-13

Thanks guys for the suggestions. I got this working yesterday using DMA_NORMAL mode - bascially as Tesla Delorean suggested - determine when the data in the circular buffer wraps, then use the DMA to send the data up to the end of the buffer, and se...

RonHreha · 2024-09-12

It appears you have experience with this so I guess I believe you. I didn't see where the STM32 reference manual describe the UART transmit DMA working that way. I also don't see a valid use for the UART transmit DMA to operate in the fashion you d...

RonHreha · 2024-09-12

Additionally, I'm using the HAL_UART_TxCpltCallback callback function to inspect the qhead and tail to see if any more bytes need to be transmitted, and potentially restart the UART transmit DMA from within the callback function. All of that is work...

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STM32F030 UART transmit DMA circular mode won't stop transmitting

Re: STM32F030 UART transmit DMA circular mode won't stop transmitting

Re: STM32F030 UART transmit DMA circular mode won't stop transmitting

Re: STM32F030 UART transmit DMA circular mode won't stop transmitting

Re: STM32F030 UART transmit DMA circular mode won't stop transmitting