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RTI DMA MIBSPI RM48x

Brice Plavonil
Intellectual 720 points

Hello all,

 

Do you know if it possible on the RM48x Hercules microcontroller to use the RTI to trigger the DMA that will trigger the MIBSPI?

I know that the MIBSPI can actually trigger the DMA so that the data to transmit is put in the Transfer group and the data received can be put in a buffer.

I know that the RTI can trigger the DMA.

But I don’t know if actually for instance every 1 ms the RTI trigger a DMA channel which can itself trigger the transmission of data through SPI?

If my question is not clear, please let me know.

Thank you for your help.

Best Regards,

  • 0
    TI__Guru 72500 points
    Yes, if the SPI is in master mode. You can use a DMA channel that is triggered by the RTI to write to the SPI Transmit data register, SPIDAT0. That starts an SPI transfer. When the transfer is complete, the SPI RX_DMA_REQ can initiate another DMA channel to copy from the SPI Receive Buffer Register. If you need to transfer more than 16 bits, the process is more complicated, but can still be done.
  • 0 in reply to Bob Crosby
    Intellectual 720 points
    I want to transfer an array of byte (for instance 100 bytes). Is it the same process for the MIBSPI? I see in your reply that it is for the SPI