H7 fast ADC

[rusefillc]

We need fast ADC in H7

[rusefillc]

@mck1117 is driving on H7 with only slow ADC to the best of my knowledge

@andreika-git is interested in fast ADC looks like has has custom changes we need to coordinate upstream merge tactics

[andreika-git]

Related to: #3031

[mck1117]

H7 is currently actually using fast ADC exclusively - it just needs a bit of plumbing to make it work.

[rusefillc]

@mck1117 we have

#define EFI_USE_FAST_ADC FALSE

is it just a confusing way to say "we use only one kind of ADC speed and it's actually fast but flag name is not great"?

[rusefillc]

Required for #3323

[andreika-git]

So do we have a 10kHz sample rate for H7 ADC?

[mck1117]

rusefi/firmware/hw_layer/ports/stm32/stm32_adc_v4.cpp

Line 110 in b5b86ac

constexpr uint32_t samplingRate = 10000;

[mck1117]

H7 uses 10khz hardware triggered ADC, with hardware oversampling. Everything that goes in the buffer is already oversampled, no extra CPU work required.

[rusefillc]

@mck1117 do you plan more changes in this area?

[mck1117]

I think it's probably OK for now. Normal high speed ADC functions work fine!

[rusefillc]

@andreika-git what's the next step for this ticket in your opinion?