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Hsck for working analogRead for internal channels (Vref and Temperature) #241

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Hsck for working analogRead for internal channels (Vref and Temperature) #241

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ccf0301
Update analog.cpp - enable internal sensors (VREF and Tepm)
fulda1 Jan 31, 2026
4c1ae83
Update wiring_analog.c - add hack for internal channels
fulda1 Jan 31, 2026
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4 changes: 4 additions & 0 deletions cores/arduino/ch32/analog.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -628,6 +628,10 @@ uint16_t adc_read_value(PinName pin, uint32_t resolution)
channel = get_adc_internal_channel(pin);
samplingTime = ADC_SAMPLINGTIME_INTERNAL;
padc = ADC1;
#if defined(CH32V20x)
ADC_TempSensorVrefintCmd(ENABLE); /* enable internal channels, not sure about other platforms... */
#endif

}
else
{
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5 changes: 5 additions & 0 deletions cores/arduino/wiring_analog.c
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Original file line number Diff line number Diff line change
Expand Up @@ -125,6 +125,11 @@ uint32_t analogRead(uint32_t ulPin)
uint32_t value = 0;
#if defined(ADC_MODULE_ENABLED) && !defined(ADC_MODULE_ONLY)
PinName p = analogInputToPinName(ulPin);
if ((ulPin & PADC_BASE) && (ulPin < ANA_START)) //internal channel
{
p = ulPin; // replace back internal channel reference
}

if (p != NC) {
value = adc_read_value(p, _internalReadResolution);
value = mapResolution(value, _internalReadResolution, _readResolution);
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