ADC_Multiple_Channel with DMA

[Bhuvana]

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

[PetrS]

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

BR, Petr

[Bhuvana]

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.

[PetrS]

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