I am using a timed scan of four ADC channels and DMA in circular mode to place them in an array. My goal is to place each of the four ADC results in a separate 1024-element circular buffer using DMA or DMAMUX. Does anyone have some guidance?

[Javier1 · Accepted solution]

the DMA automatically interleaves the ADC values.

It will fill (as a circular buffer if configured that way ) the array you pass as an argument, no matter the length untill you stop it.

uint32_t ADCReadings[1024];
 
//DMA will take hadc1 readings(interleaving channels) and store them inside ADCReadings array, the circular buffer created has legth 1024
 
HAL_ADC_Start_DMA(&hadc1, (uint32_t*) ADCReadings, 1024);

DMA will fill ADCReadings as follows: (if 4 channels from adc are activated)

1. ADCReadings[0]= value from 1st channel
2. ADCReadings[1]= value from 2nd channel
3. ADCReadings[2]= value from 3rd channel
4. ADCReadings[3]= value from 4rd channel
5. ADCReadings[4]= value from 1st channel
6. ADCReadings[5]= value from 2nd channel
7. ADCReadings[6]= value from 3rd channel
8. ADCReadings[7]= value from 4rd channel

.............

1024.ADCReadings[1023]= value from 4rd channel

[JRobe.2]

Thank you TDK.

You and Javier both gave me the same guidance.

I apprecieate your help.

SR

[JRobe.2]

This will work very well for my needs.

Very nice explanation.

Thank you Javier.