S32KのトピックRe: ADC_Multiple_Channel with DMA

ADC_Multiple_Channel with DMA

Bhuvana — Fri, 20 May 2022 06:49:11 GMT

Hi,

Through DMA I'm reading adc channel 1st its working fine but in run time if I change value only 1st 8 channel is reading the correct data in remaining channels I'm not able to read the data its showing same old data only

Re: ADC_Multiple_Channel with DMA

PetrS — Fri, 20 May 2022 09:19:23 GMT

Hi,

could one of below examples be useful?

https://community.nxp.com/t5/S32K-Knowledge-Base/Example-S32K144-PDB-ADC-trigger-DMA-ISR-S32DS/ta-p/1103221
https://community.nxp.com/t5/S32K-Knowledge-Base/Example-S32K144-PDB-ADC-DMA-S32DS-ARM-2018-R1/ta-p/1101686

BR, Petr

Re: ADC_Multiple_Channel with DMA

Bhuvana — Fri, 20 May 2022 11:17:35 GMT

Hi @PetrS through this example only I have implemented but I have used only PDB0,ADC0 channels. Every thing is same but not able to identify the problem exactly.

Re: ADC_Multiple_Channel with DMA

PetrS — Tue, 24 May 2022 08:34:44 GMT

Hi,

seems it is due to sample time is set to be inconsistent with PDB setting. Change ADC0 clock to run from FIRC DIV2 in Clocks tool. Set sample time = 14 in ADC component. Finally if 14 samples are read by DMA, then config 14 pretriggers in PDB0_init.

BR, Petr