topic dma adc pdb in Kinetis Software Development Kit

dma adc pdb

benelghali — Wed, 12 Aug 2015 20:58:56 GMT

hello everybody,

here is my problem i configured dma channel 0 on pdb request and in this transfer i configured ADC0 SC1A register so it generate a soft trigger to begin adc0 conversion.

In the other hand i configured dma channel 1 on ADC0 COCO request to transfer data from ADC0 RA to a buffer i created.

So regarding to this configuration i expected to have one conversion after each PDB request.

To check this i configured a dma channel1 interrupt and i set then reset a pin to see a pulse at the oscilloscope each time a conversion is complete.

here is my problem i got a continuous train of pulses that are not synchronized with the pdb request so i checked the adc0 and it is not configured in continuous mode so i didn't understand why i didn't have the desired behavior.

Can anyone help me please.

Thanks.

Re: dma adc pdb

Alice_Yang — Thu, 13 Aug 2015 02:21:13 GMT

Hello biel,

Please tell us which chip do you use ?

And you'd better show your code .

And pay attention , for example k64 chip, from the RM:

In Software Trigger mode, when SC2[ADTRG]=0, writes to SC1A

subsequently initiate a new conversion, if SC1[ADCH] contains a value other than all 1s.

It meaning when SC2[ADTRG]=0, when wites ot SC1A register , it will start a new conversion, please check .

Alice

Re: dma adc pdb

Hui_Ma — Thu, 13 Aug 2015 07:26:43 GMT

Hi,

Please check the update at the below thread:

adc dma pdb

Thank you for the attention.

Have a great day,
Ma Hui

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