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Simultaneous DMA transfer for DAC and I2C FRDMK64F

Question asked by vinod s on Jan 16, 2018
Latest reply on Jan 17, 2018 by Hui_Ma


  I am transferring PCM audio to DAC peripheral via DMA in circular manner. Here the DMA is continuous and triggered by PIT at 44100 Hz. I cannot halt this at any time. I am decoding MP3 and transferring to DAC via DMA, while DMA is throwing first half of PCM, I will be decoding and filling second half and vice versa, this is working fine for now.



 I am transferring a frame buffer to OLED in one shot which I tested already with DMA transfer and it is working fine. But if DAC transfer is already happening via DMA as a continuous circular process and in the middle of it how can I do I2C transfer via DMA without affecting the DAC transfer ?


Currently I couldn't find a solution so I am using I2C BULK transfer via Interrupt in non blocking mode which works fine for me with a little penalty of ISR hit which is ok for my application. But I am curious to know if there is any way to do both DMA simultaneously ?


It seems like it is having only one DMA0 in hardware and I don't know if it can do simultaneous transfer.


Any clue?