STM32H533CET6 ADC Reading

[Karol123]

I am encountering an issue with ADC readings on a custom board based on the STM32H533CET6.

Hardware Setup: I have a simple analog filter connected to the ADC input. I have verified the input signal with a multimeter, and it correctly varies from 0V to 3V.

The Problem: Despite the varying input voltage, the value in the ADC_DR register appears to be stuck at 1024. It does not change regardless of the voltage level applied to the pin.

Configuration details:

• Resolution: 12-bit

• VREF+: 3.3V

Has anyone experienced a similar issue with the H5 series or sees what I might be missing?

[TDK]

You're converting two channels, so you should be using DMA and reading values from the buffer, not from ADC->DR. Buffer size doesn't seem sufficient given that you're converting two channels.

[Karol123]

Thnak you for answer. Can you tell me how can I fix it?

[TDK]

Here is an example which uses ADC and DMA.

STM32CubeH5/Projects/NUCLEO-H533RE/Examples/ADC/ADC_MultiChannelSingleConversion at main · STMicroelectronics/STM32CubeH5

[k_walks]

Did you manage to solve this? I have the same issue, on DMA or on polling the ADC, always 1024, I’d appreciate any knowledge of how you got out of it!