STM32U545 : LPBAM cotinuous ADC multichannel

[Aurelien1]

Hi,

I am using an STM32U545 on which I expect to use ADC4_IN1 and ADC4_IN18 in stop mode 2 (using LPBAM).

I want to create two buffer (buff1 and buff2 uint16_t[32]) dedicated to each input.

I want to read 32 samples from input1 then 32 samples from input2 and restart infintely.

I don't find the correct way to configure LPBAM.

In first try, I use an LPTIM1 as trigger I do :

(sorry my project I can't get image of LPBAM configuration)

1) ADC conversion (channel 1) => ADC Conversion (channel 20) and loop on first conf bloc and use LPTIM1 trigger for both

    => In this case each buffer contain values from correct input but i run only once

2) If I do the same but loop on first data bloc => only last channel ise infinitrly sampled on both buffer

Can someone help me to configure it correctly?

Thanks

Have a good day.

 

Aurélien

 

[Sarra.S]

Hello @Aurelien1, 

One way is to use the DMA linked list to link the nodes and enable buffer chaining

=> check this presentation 

 

[Billy OWEN]

Hi @Aurelien1 

 

This post has been escalated to the ST Online Support Team for additional assistance.  We'll contact you directly.

 

Regards,

Billy

[Aurelien1]

Hi, do you have more information about channel switching in LPBAM?

To remind, I expect to get 32 samples of one channel before switching to the next one and so on.

[Aurelien1]

Is it possible to get an example? I am still unable to do it working...

Thanks for your help

[OOUAD]

Hello @Aurelien1,

 

I suggest porting the project located in STM3CubeFW_U5 from STM32U575 to the STM32U545 :

STM32Cube_FW_U5_V1.8.0\Projects\NUCLEO-U575ZI-Q\Applications\LPBAM\LPBAM_ADC_IntExtChannelSwitch

 

BRs,

Oussema.