How to use DMA to get ADC result without interrupt in S32K344

[KerryJ]

Hi, I want to learn How to use DMA to get ADC transformation result without ADC interrupt.

I used S32K344,

IDE is S32DS3.4 ,

RTD is S32K3 RTD AUTOSAR 4.4 VERSION 2.0.0

I am confused about how to config that.

Hope to get your help, thanks.

[PetrS · Accepted solution]

Hi,

you can refer to possible implementation in 

https://community.nxp.com/t5/S32K-Knowledge-Base/Example-S32K344-PIT-BTCU-ADC-DMA-DS3-4-RTD100/ta-p/...

BR, Petr

[KerryJ]

thanks for your help, but my RTD VERSION IS 2.0.0. I can't run the project you give.

[PetrS]

Hi,

I added RTD200 version as well, so you can try.

BR, Petr

[MVR]

Hello @PetrS ,

In your example you used 5 ADC channels but in "Adc_Sar_Ip_1" you defined only 1 channel, is that correct?

Is it not necessary to put all channels in this array?

Thanks,

MVR

[PetrS]

Hi,

actually in this example BTCU is used to trigger conversions and command list is created with 5 commands.

DMA then reads result from BCTU data register.

BR, Petr

[MVR]

Ok, I understand it,

But my question is: In "Adc_Sar_Ip_1" in the "Channel configurations array" option, don't you need to fill with the 5 channels used in your list?

[PetrS]

Hi,

the "Channel configurations array" option is for specifying which channels will be converted during normal conversion. It configs NCMRx registers. This is not used in the example

BR, Petr

[MVR]

Hmmm, I understand now! Thanks