How to read multichannel ADC in STM32
THIS MIGHT NOT WORK WITH THE NEWER CUBEMX VERSIONS. CHECK OUT THE UPDATED METHOD HERE
I have already posted articles about ADC in STM32 using PollforConersion, Interrupt and DMA methods. But in all those articles, I used single channel of the ADC. So today We will see How to read multichannel ADC in STM32.
The process remains same as using in single channel, with some addons though. Let’s get into it
First we need to set up the channels, we want to read, under ADC. Here I will read Channels 0, 1 and internal temperature sensor (16).
1.) USING PollforConversion Method
With the new firmware, it’s not possible to use the PollforConversion directly. I have written a tutorial where we can modify the pregenerated functions to make it possible. Check that out https://controllerstech.com/stm32-adc-multi-channel-without-dma/
2.) USING DMA METHOD
To use DMA, we need to enable the DMA continuous request in the ADC configuration. Also enable the interrupt and setup the DMA as shown below->
Generate the project and open it.
Now we have to write a conversion complete function. It will be called whenever the conversion of the ADC values is completed.
Start the ADC in DMA mode in the main function.
As to show that it works completely independent, I will blink a LED inside the while loop and the ADC values will be received separately from the while loop.
THIS code is for DMA method
CHECK OUT THE UPDATED METHOD HERE
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