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Original question:

AM2634: configure EDMA to transfer ADC reuslts in FREERTOS environment

AM2634: ADC DMA implementation for multiple channel

Oleg Chaichenko
Prodigy 140 points
Part Number: AM2634


Hi TI team!

I have 3 ADC with lines (6,6,4) is it possible to use DMA continuous mode for gathering results from all lines?

I planned take info at different times from each line.

In the example, we bind an interrupt from the ADC to the DMA channel. But there are only 4 interrupts on each module.

Is it possible to tie 6 lines from one module to one interface with DMA?

  • 0
    TI__Intellectual 2227 points

    Hi Oleg,

    Yes there are only 4 interrupt configurations from each ADC instance, which may also be used as triggers for the DMA transfers. The DMA may be configured for multiple result register data transfer for one trigger. If 6 lines are sampled subsequently, consider the last SOC to trigger INT, thereby DMA

    Note that in AM263X ADC Late interrupt configuration is fired slightly earlier than the result latching in the ADC result space,  hence the errata and the example shows the workaround, where one dummy channel transfer is done before the actual result transfer. 

    Thanks and regards, 

    Madhava