ADC Clock Setting in ST Cube MX for STM32H742VGT

[TA1]

Dear all,

I used STM323H742VGT in one of my cards and I would like to configure it with ST Cube MX V6.5.0. According to the reference manual ADC clock source and pre-scaler can be set using ADCx_CCR register.

I would like to use asynchronous clock source which is adc_ker_ck_input. However, I couldn't find any setting in ADC section of CubeMX. There aren’t any settings also for pre-scaler. I am familiar with STM32F7 and I could select pre-scaler over Cube MX.

On the other hand, ADC_Clock is not enabled in Clock Configuration page in Cube MX. I don't know why. Normally, if I set a peripheral, related clock is enabled and I can change parameters in Clock configuration page.

I added some screen shuts and if you can help me, it would be great. If I cannot set in ST cube MX, I need to write driver for it. I prefer ST Cube MX should do it for me. I may miss one thing to set and spend days to figure out.

Best Regards

[Aziz BRIGUI]

Hello @TA​ ,

Thank you for your feedback,

This is a known issue and is already reported to the dev team to be fixed. Please refer to this link for more details.

Best regards,

Aziz

[TA1]

Dear ABRIG

Thank you very much for the information. I understood the known issue is about ADC_Clock(+ADC Mux) in Clock configuration page of Cube MX. What about ADC clock source selection and pre-scaler. There is not any setting in ADC Settings under Pinout&Configuration page. According to Reference Manual, we can select asynchronous or synchronous clock source by setting CKMODE bits in ADCx_CCR register. This should be set in ADC Settings of Cube MX and if asynchronous clock input is selected, pre-scaler should be set as well (PRESC[3:0] bits of ADCx_CCR).

Can you provide a sample code or driver which is about RCC and ADC settings in code level while Cube Mx will be fixed. I believe Cube MX cannot generate correct code for it. To be honest I can develop such code but H7 is complex comparing F4/F7 series.There are 3 power domains and so on. ADC1 and 2 are in the same domain and ADC3 is in another domain. I don't want to miss any settings.

Regards

[Aziz BRIGUI · Accepted solution]

Hello @TA​,

The issue regarding the missing ADC pre-scaler settings is also reported internally. We apologize for the inconvenience, it will be corrected as soon as possible.

Internal ticket number: 124655 (This is an internal tracking number and is not accessible or usable by customers).

In the meantime, you can refer to the firmware examples for NUCLEO-H743ZI for reference code.

If you still have questions regarding the issue, do not hesitate to ask.

Best regards,

Aziz

[Aziz BRIGUI]

Hello @TA​,

Issue fixed in STM32CubeMX latest release.

V6.6.0 is now available under this Link.

Thank you for your contribution.

Best regards,

Aziz.