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analogReference: add getter for AR_INTERNAL if defined at variant level #190

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Merged
merged 1 commit into from
Nov 16, 2023
Merged

analogReference: add getter for AR_INTERNAL if defined at variant level #190

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6 changes: 5 additions & 1 deletion cores/arduino/analog.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -570,13 +570,17 @@ float analogReference() {
case ADC_VREF_CONTROL_VREFH0_AVSS0:
// the user must know the voltage he applies from outside
return NAN;
#ifdef AR_INTERNAL_VOLTAGE
case ADC_VREF_CONTROL_IVREF_AVSS0:
return AR_INTERNAL_VOLTAGE;
#endif
default:
#if defined(AVCC_MEASURE_PIN)
if (aref == 0) {
analogReference(AR_INTERNAL);
delayMicroseconds(5);
for (int i = 0; i < 10; i++) {
aref += analogRead(AVCC_MEASURE_PIN) * 1.43f * AVCC_MULTIPLY_FACTOR / (1 << _analogRequestedReadResolution);
aref += analogRead(AVCC_MEASURE_PIN) * AR_INTERNAL_VOLTAGE * AVCC_MULTIPLY_FACTOR / (1 << _analogRequestedReadResolution);
}
aref = aref / 10;
analogReference(AR_DEFAULT);
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2 changes: 2 additions & 0 deletions variants/MINIMA/pins_arduino.h
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Expand Up @@ -156,6 +156,8 @@ static const uint8_t SS = PIN_SPI_CS;
#define AVCC_MEASURE_PIN 20
#define AVCC_MULTIPLY_FACTOR 8.33

#define AR_INTERNAL_VOLTAGE 1.43f

#define USB_VID (0x2341)
#define USB_PID (0x0069)
#define USB_NAME "UNO R4 Minima"
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2 changes: 2 additions & 0 deletions variants/PORTENTA_C33/pins_arduino.h
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Expand Up @@ -207,3 +207,5 @@ static const uint8_t SS = PIN_SPI_CS;
#define SerialLoRa Serial3

#define RTC_CLOCK_SOURCE RTC_CLOCK_SOURCE_SUBCLK

#define AR_INTERNAL_VOLTAGE 1.18f
2 changes: 2 additions & 0 deletions variants/UNOWIFIR4/pins_arduino.h
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Expand Up @@ -158,6 +158,8 @@ static const uint8_t SS = PIN_SPI_CS;
#define AVCC_MEASURE_PIN 20
#define AVCC_MULTIPLY_FACTOR 8.33

#define AR_INTERNAL_VOLTAGE 1.43f

#define USB_VID (0x2341)
#define USB_PID (0x006D)
#define USB_NAME "UNO R4 WiFi"
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