This is weird. Also it was working at one point and stopped working, can't track down the code change that broke this.
So, I use HAL_UART_Receive_DMA() to start a DMA RX. I can use _HAL_DMA_GET_COUNTER() to check how many characters have been received and I am receiving characters, but the contents of the buffer I passed to HAL_UART_Receive_DMA() is not changing. Why would the DMA counter increase but not the memory buffer contents? I checked the hdmarx handle in the UART handle, the Instance pointer in the hdamarx handle, and the MOAR and PAR pointers in the DMA peripheral - everything looks correct.
What more can I do to try to diagnose this problem?
Normal DMA (not circular), Peripheral to Memory. Interrupt should be enabled but I don't think I need it with checking the buffer contents as it's received.
I got the idea to poll DMA contents while receiving from this blog post:
And it worked for a while until something in the code broke.
This is a program with TouchGFX and it has always been trouble, just stuff in the HAL randomly breaking that has worked before. I currently have TouchGFX disabled right now.
