I'm struggling to get something presumably straightforward, to work.

I'm trying to use DMA to pump a 4K sine table (precalculated) through a DAC on my Nucleo-F446RE board.

I've successfully had this working where the app just loops and writes the values from slot 0 to 4095, over and over and that works fine, I see the expected sine wave on my DSO.

Now I've modified this to use DMA and need help, I can find no concrete example of this for my specific board. I am also using a book Programming with STM32 (by Donald Norris), not a bad book but again this specific example isn't covered.

I also used Cube to generate the initialization code for the various peripherals.

So my question is this, can anyone see anything obvious missing from this main function?



Thanks

 

You're talking gibberish the question you posed is extensive please clarify

 

You're talking gibberish the question you posed is extensive please clarify

The question is very clear, the last line of my post is quite clear I think.

 

The question is very clear, the last line of my post is quite clear I think.

I absolutely love posters who respond when asked to clarify their post, replies that it is quite clear!

IF IT WAS CLEAR WE WOULDNT ASK YOU TO CLARIFY!

Good luck, I’m not falling into this rabbit hole...

 

I don't use this chip but a few questions.

SINEWAVE_[1..2] are uint32_t arrays while the DAC data register is a uint16_t. I see you are using WORD dma transfers to account for this in the length count but HALFWORD might be better with 16-bit data.

Some driver source that might help.
http://www.disca.upv.es/aperles/arm...ual/stm32f4xx__hal__dac_8c_source.html#l00450

 

Mod edit: deleted profane quote - JohnInTX

A completely unnecessary response.

 

Enough for now