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    Hi Michael This is an old post, I realise, but...

    Hi Michael

    This is an old post, I realise, but I just found it and decided to have a go at adapting your code for the Teensy 4.1 and my vstcm vector generator PCB which targets real vector...
  2. Thanks for your reply. I have managed to do...

    Thanks for your reply. I have managed to do concurrent writes to the 2 easily accessible SPI busses now after repinning my PCB, but there is no performance gain, possible as i'm only writing 16 bits...
  3. I have now got SPI.transfer16 and the non...

    I have now got SPI.transfer16 and the non blocking SPI.transfer with event handler working, but I'm addressing each of the 3 MCP4922 DACs with dual channels sequentially and sending 12 bits of data +...
  4. Teensy 4.1 simultaneous SPI.transfer calls with eventhandler using LPSPI 1, 2 & 4

    I am using a Teensy 4.1 to write to 3 dual channel MCP4922 DACs with the non blocking SPI.transfer command and an event handler (eg SPI.transfer(dmabuf, nullptr, 2, callbackHandler); ). I'm currently...
  5. I tried out transfer16 and just could not get it...

    I tried out transfer16 and just could not get it to work for some reason. I didn't realise that there was transfer32. I'll try again... thanks for the suggestion.
  6. Yes, performance is lacking as I'm updating the 5...

    Yes, performance is lacking as I'm updating the 5 channels sequentially. I'm using the simple form of SPI.transfer with one parameter which is the data (which is blocking, I believe). There seems to...
  7. Anyone able to offer any advice on this? It's an...

    Anyone able to offer any advice on this? It's an open source project for the arcade community. I was thinking that FlexIO could be an alternative solution to DMA maybe?
  8. I have just posted up the complete project on...

    I have just posted up the complete project on Github: schematic, gerber, BOM, code, etc in the hope that this will encourage someone to spend a little time getting DMA up and working on this exciting...
  9. Sending data to external DAC using Teensy 4.1, SPI and DMA

    I'm using Arduino 1.8.19 / Teensyduino 1.56 to code a custom PCB which has a Teensy 4.1 and 3 external MCP4922 dual channel DACs. The code is meant to take a buffer of data and send it to the...
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