Trigger Multiple ADC readings on PIT

[ArmandoPinedaMedina]

Hi!
I am using MKE14F512VLH16 microcontroller with the latest MCUXpresso IDE.

I need to read multiple ADC channels periodically so I think that the most eficient solution is to trigger ADC readings using a PIT timer.

The problem is that I can only start one convertion at once so maybe using eDMA to launch multiple channel readings is the way to do it.

So I have the PIT Timer triggering the eDMA transfer from a vector where I have the ADC channel that needs to be read to the ADC0 Status and Control Register 1.

Then I have a eDMA to copy the result of the ADC convertion to a vector of results.

But it seems to not be workins since I dont see value of the channels to read get loaded on the ADC SC1 register. I thing it is a problem on my eDMA configuration or in the PIT triggering configuration.

The configuration is the next.

For the PIT Perihperal and pit trigger multiplexing:

Then the configuration of the ADC is:

ArmandoPinedaMedina_0-1661186001421.png

An the DMA:

ArmandoPinedaMedina_1-1661186038736.png

DMA Ch0:

ArmandoPinedaMedina_2-1661186152288.png

/* Enable ADC channel 2 configuration - 0x10 , 0x11 */
AT_NONCACHEABLE_SECTION_INIT(uint32_t adc_trigger[2]) = {10U, 11U};

DMA Ch1:

ArmandoPinedaMedina_3-1661186305169.png

/* Result buffer with ADC measurement output */
AT_NONCACHEABLE_SECTION_INIT(uint32_t ADC_RESULTS[2]) = {0};

[Pavel_Hernandez]

Hello,

I suggest downloading the SDK of the FRDM-KE15 this has some examples with the ADC, I mean you can port to your target.

Pavel_Hernandez_0-1661463944933.png

Best regards,
Pavel