How can I reset ADC measurement for the next measurement?

[KKIM.6]

Right now, I'm focusing on increasing ADC channel.

I assembled the STM32WB55VG microcontroller and 8:1 mux.

The mux is contolled by three GPIO pin for [2:0] encoding to select channel.

The output of mux is connected to the ADC and I can see the ADC data using DMA.

If I select one channel in the mux, I can collect data exactly.

However, if I operate the mux with switching channel (I gave ~1 ms of interval for each channel), the most recent channel data is filled to the previous channel (last channel data only appears in all the channel data).

I know that the microcontroller has single ADC and multiple channel itself and it works very well when I use scan conversion mode. It imply that there is a very quick reset state in the ADC to restart measurement for next channel.

So, I wonder how can I force to reset ADC measurement for the next channel in the coding and whether it is possible.

[raptorhal2 · Accepted solution]

So, I wonder how can I force to reset ADC measurement for the next channel,,,,,

After switching the mux, restart the ADC conversion for its one channel and wait for DMA complete before reading the result.

[KKIM.6]

Oh!! it's working.

You are right. If I add HAL_ADC_Start(&hadc1); every time after changing MUX channel, the cross talking disappear!

Thanks man.