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JohnBirchmeier · 2024-03-06

Documentation Error? RM0368 sections 11.12.4 and 11.12.5 list sample A2D clock times for 8 different sample time settings. For all but setting 0, the data seem to disagree with my testing and performance measurements. My measurements indicate: // Sam...

JohnBirchmeier · 2024-03-06

You were right, I just could not see the issue.

JohnBirchmeier · 2024-03-06

I think I have all three channels set the same sampling time setting. For example, for setting 1, this is the ADC1->SMPR2 (offset 0x10) register value before the DMA starts and the value is unaltered when it stop. See image:ADC1 offset 0x10 set to 0x...

JohnBirchmeier · 2024-03-06

The DMA completes after 300 conversions (i.e. 100 scans of 3 channels). The DMA is configurated for continuous requests with callbacks for 1/2 complete and complete.Do you want me to strip down my test code and send you a copy? Do you have access to ...

JohnBirchmeier · 2024-03-06

NOTE: I just noticed that I have set the ADC clock pre-scaler set to 2, whereas the Device Configuration Took will only allow a setting of [4, 6 or 8]. Perhaps I'm violating some rule here ... I'll update my code and retest.

JohnBirchmeier · 2024-03-06

I have a 10KHz timer. I grab the value at the start of the DMA and grab the time again from within the DMA callback and I hit 10 million scans (i.e. 30 million A2D conversions complete).I also verified the 10KHz timer operation by dumping its value t...

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STM32F401RE - ADC SMPRx 'sample time setting'

Re: STM32F401RE - ADC SMPRx 'sample time setting'

Re: STM32F401RE - ADC SMPRx 'sample time setting'

Re: STM32F401RE - ADC SMPRx 'sample time setting'

Re: STM32F401RE - ADC SMPRx 'sample time setting'

Re: STM32F401RE - ADC SMPRx 'sample time setting'