stm32/adc: Add STM32H5 support.

[renestraub]

Description

Add STM32H5 ADC support to pyb.ADC by correcting existing code.

Changes are:

• Run ADC on PCLK/16
• Use STM32 ADC library channel literals (__HAL_ADC_DECIMAL_NB_TO_CHANNEL)
• Use correct temperature conversion for H5 (30°C, 130°C calibration points)
• Add support for ADC2 input channels
• Optimize sample time for external inputs

Thanks to @yn386 for discussions.

Environment

• NUCLEO-H563ZI
• Using STM32H573I-DK board with minor modifications (input clock, on-chip flash)
• First ADC Input (PF12) connected externally to GPIO PF14

MicroPython v1.20.0-283-g7d66ae603-dirty on 2023-07-29; STM32H573I-DK with STM32H573IIK3Q

Tests

from pyb import Pin, ADC, ADCAll

io = Pin('F14', Pin.OUT_PP)
io.high()

adc=ADC(Pin('F12'))
adc.read()
# Result: 4095 -> Ok, 3.30 V

io.low()
adc.read()
# Result: 4 --> Ok, ~2 mV
adc.read()
# Result: 2 --> Ok, ~1 mV

# Pin F13 is only available on ADC2, for test connect ADC Input PF13 to GPIO PF14
adc2=ADC(Pin('F13'))
print(adc2)
<ADC2 on Pin(Pin.cpu.F13, mode=Pin.ANALOG) channel=2>

io.high()
adc2.read()
# Result: 4087 --> Ok
io.low()
adc2.read()
# Result: 2 --> Ok


all=ADCAll(12,0x70000)
all.read_core_temp()
# Result: 28.2205 -> Ok 

all.read_core_vref()
# Result: 1.207985 -> Ok, nominal 1.21 V

[renestraub]

@yn386 I enhanced the PR to support ADC2 channels on STM32H5 in pyb.adc. Would you mind to have a look at the changes? Together with my other PR ADC support should be complete for the H5.

[dpgeorge]

Thank you for these fixes. I have tested them and they work.

Merged in 13cc280 through 64d24fc