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Fix heltec v3.2 pin polarity reversal

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This commit is contained in:
Alex Wolden
2025-03-05 19:52:24 -08:00
parent 9b5a294695
commit 3dea712d37
1 changed files with 11 additions and 2 deletions
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13
src/helpers/HeltecV3Board.h
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@@ -24,11 +24,20 @@
#include <driver/rtc_io.h> #include <driver/rtc_io.h>
class HeltecV3Board : public ESP32Board { class HeltecV3Board : public ESP32Board {
private:
bool adc_active_state;
public: public:
void begin() { void begin() {
ESP32Board::begin(); ESP32Board::begin();
// Auto-detect correct ADC_CTRL pin polarity (different for boards >3.2)
pinMode(PIN_ADC_CTRL, INPUT);
adc_active_state = !digitalRead(PIN_ADC_CTRL);
pinMode(PIN_ADC_CTRL, OUTPUT); pinMode(PIN_ADC_CTRL, OUTPUT);
digitalWrite(PIN_ADC_CTRL, !adc_active_state); // Initially inactive
pinMode(PIN_VEXT_EN, OUTPUT); pinMode(PIN_VEXT_EN, OUTPUT);
digitalWrite(PIN_VEXT_EN, LOW); // for V3.2 boards digitalWrite(PIN_VEXT_EN, LOW); // for V3.2 boards
@@ -69,7 +78,7 @@ public:
uint16_t getBattMilliVolts() override { uint16_t getBattMilliVolts() override {
analogReadResolution(10); analogReadResolution(10);
digitalWrite(PIN_ADC_CTRL, PIN_ADC_CTRL_ACTIVE); digitalWrite(PIN_ADC_CTRL, adc_active_state);
uint32_t raw = 0; uint32_t raw = 0;
for (int i = 0; i < 8; i++) { for (int i = 0; i < 8; i++) {
@@ -77,7 +86,7 @@ public:
} }
raw = raw / 8; raw = raw / 8;
digitalWrite(PIN_ADC_CTRL, PIN_ADC_CTRL_INACTIVE); digitalWrite(PIN_ADC_CTRL, !adc_active_state);
return (5.2 * (3.3 / 1024.0) * raw) * 1000; return (5.2 * (3.3 / 1024.0) * raw) * 1000;
} }