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EK-TM4C1294XL: Using ADC0 and ADC1 simultaneously and transfer the data with uDMA

Constantin Weis
Prodigy 150 points
Part Number: EK-TM4C1294XL


Hello,

I wanna sample two analog inputs with ADC0 and ADC1 when I´m receiving an interrupt from a port pin. My question is: Is it possible to transfer the data from both ADC modules with the DMA?  

Kind regards,

Constantin Weis

  • 0
    TI__Guru**** 191906 points

    Hi Constantin,

     Yes, you can use the DMA to transfer the data from ADC FIFO to a buffer. There is an example doing just that in the latest TivaWare version 2.2.0. The example is in <TivaWare_Installation>/examples/boards/ek-tm4c1294xl/adc_udma_pingpoong.

  • 0 in reply to Charles Tsai
    Prodigy 150 points

    Hello Charles,

    yes thank you, but can I transfer data from for example FIFO3 during I´m transfering data from FIFO2 with the DMA? Because I need about 50 Samples. Or do I have to use one sample sequencer where I can sample multiple inputs and transfer the data from that FIFO with the DMA? Thanks in advance.

    Kind regards,

    Constantin

  • 0 in reply to Constantin Weis
    TI__Guru**** 191906 points

    Hi Constantin,

      You can do it either way. Since you only have two analog inputs to sample, I will use just one sequencer to do the job. You will only need to setup one uDMA channel and one sequencer for your application which will simplify your software development.