STM32F4xx DISCOVERY multiple ADC with DMA

[bmarguerite19]

Posted on December 29, 2013 at 17:13

Hi

I want to use ADC-DMA to read 4 input of voltage. PA0, PA1, PA2 and PA4 on ADC3 IN0, IN1, IN2 and IN4.

I try to modify the code samples founded in STM32F4xx-Discovery_FW_V1.0.0 for STM32F4-DISCOVERY or for STM32F429-DISCOVERY but both don't work (my code) on theses boards.

In final i must read this four ADC inputs with a stable frequency, i want to use a Timer.

Someone can help me with sources please?

Thanks

I'm leaving in France

[Tesla DeLorean]

Posted on December 29, 2013 at 20:22

Continuous mode, two channels.

[DEAD LINK /public/STe2ecommunities/mcu/Lists/STM32Discovery/Flat.aspx?RootFolder=/public/STe2ecommunities/mcu/Lists/STM32Discovery/Multi%20Channel%20ADC%20reading&FolderCTID=0x01200200770978C69A1141439FE559EB459D75800084C20D8867EAD444A5987D47BE638E0F&currentviews=365]https://my.st.com/public/STe2ecommunities/mcu/Lists/STM32Discovery/Flat.aspx?RootFolder=%2Fpublic%2FSTe2ecommunities%2Fmcu%2FLists%2FSTM32Discovery%2FMulti%20Channel%20ADC%20reading&FolderCTID=0x01200200770978C69A1141439FE559EB459D75800084C20D8867EAD444A5987D47BE638E0F¤tviews=365

Two channels, simultaneously, against timebase

[DEAD LINK /public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/stm32f207%20ADC%2BTIMER%2BDMA%20%20Poor%20Peripheral%20Library%20Examples&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B&currentviews=1573]https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=%2Fpublic%2FSTe2ecommunities%2Fmcu%2FLists%2Fcortex_mx_stm32%2Fstm32f207%20ADC%2BTIMER%2BDMA%20%20Poor%20Peripheral%20Library%20Examples&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B¤tviews=1573

Single channel, using timer/dma

https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/ADC%20trigger%20on%20timer%20update&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B&currentviews=88

[bmarguerite19]

Posted on January 07, 2014 at 23:46

Happy New Year

I try your links and now the code works fine alone.

But when i want to read 4 ADC3 channels synchronized with TIM4, it don't work.

TIM4 is configuring to trig at frequency f2 TIM12 used for 1 PWM channel and it works. 

How configure one TIMx to trig the read of4 ADC3 channels at frequency f1 and TIM12 at frequency f2 ?  f1 = 80x f2  with f2 = 1/60µs = 8,333 337 KHz

Thanks

[Tesla DeLorean]

Posted on January 08, 2014 at 00:49

I don't have the time/resources to code this from scratch, post your semi-working example code framework and I'll see if I can understand it well enough to get it to working.

[bmarguerite19]

Posted on January 08, 2014 at 13:00

Hi CLive1

I prepare the project and take contact

[raptorhal2]

Posted on January 08, 2014 at 18:01

There are two more problems you need to consider:

PA4 is ADC12_IN4. PA4 is not connected to ADC3. And if you switch to ADC1 or ADC2, PA4 is also connected to the on board CS43L22 peripheral.

PA0 (ADC123_IN0) is also connected to the board pushbutton.

The discovery board User Manual has an MCU Pin Description table that identifies which pins are free for the user.

Cheers, Hal

[bmarguerite19]

Posted on December 30, 2013 at 13:14

Hi clive1

Thank you for your reply

I'm looking the links and try to remake them

A+