ADC

[BoboyeOkeya]

Hi All,

I would like to configure my ADC such that it is able to read from 2 channels. And that the conversion of the channels will be stored in the memory through DMA. But most importantly, I want the conversion to be triggered by a TIMer's rising/falling edge.

So basically multichannel ADC conversion triggered by timer and stored through DMA.

Can anyone point me in the right direction to look at, links, books? etc. I am presently working with an STM32F031C6 MCU.

Many thanks

[Amel NASRI]

Hi @BoboyeOkeya​ ,

A step by step hands-on is described in this video: Trigger Periodic ADC Conversions.

As it is based on STM32CubeMX/STM32CubeIDE, you can select your target MCU but the steps will be almost the same.

-Amel

[BoboyeOkeya]

Hi Amel,

This has been very useful.

Can you also help with links to a multchannel ADC using DMA and timer trigger?

Many thanks.

[Amel NASRI]

The video ADC DMA TIM HAL lab will answer your need.

-Amel

[Philippe Cherbonnel]

Hello @BoboyeOkeya​ ,

Additionally to previous post, you can refer to examples in FW packages.

For example in STM32F0 FW package:

Using ADC LL driver:

...\Firmware\Projects\STM32F072RB-Nucleo\Examples_LL\ADC\ADC_SingleConversion_TriggerTimer_DMA

Using ADC HAL driver:

a combination of these 2 examples using DMA and trigger from timer:

...\Firmware\Projects\STM32F072B-Discovery\Examples\ADC\ADC_DMA_Transfer

...\Firmware\Projects\STM32F072B-Discovery\Examples\ADC\ADC_TriggerMode

About conversion triggered by timer rising/falling edge:

It is possible using these literals:

LL driver: LL_ADC_REG_TRIG_EXT_RISINGFALLING

HAL driver: AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISINGFALLING;

Best regards

Philippe