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allow using AIN1 for VBAT on RAK19007 boards #3328

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allow using AIN1 for VBAT on RAK19007 boards #3328

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da850da
allow using AIN1 for VBAT on RAK19007 boards
andyshinn Aug 31, 2026
adb60df
document that PWRMGT_LPCOMP_AIN default is overrideable
andyshinn Sep 5, 2026
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8 changes: 6 additions & 2 deletions variants/rak4631/RAK4631Board.h
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Original file line number Diff line number Diff line change
Expand Up @@ -5,8 +5,12 @@
#include <helpers/NRF52Board.h>

// built-ins
#define PIN_VBAT_READ 5
#define ADC_MULTIPLIER (3 * 1.73 * 1.187 * 1000)
#ifndef PIN_VBAT_READ
#define PIN_VBAT_READ 5
#endif
#ifndef ADC_MULTIPLIER
#define ADC_MULTIPLIER (3 * 1.73 * 1.187 * 1000)
#endif

class RAK4631Board : public NRF52BoardDCDC {
protected:
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12 changes: 9 additions & 3 deletions variants/rak4631/variant.h
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Expand Up @@ -108,9 +108,15 @@ extern "C"
// Set to 0 to disable boot protection
#define PWRMGT_VOLTAGE_BOOTLOCK 3300 // Won't boot below this voltage (mV)
// LPCOMP wake configuration (voltage recovery from SYSTEMOFF)
// AIN3 = P0.05 = PIN_A0 / PIN_VBAT_READ
#define PWRMGT_LPCOMP_AIN 3
#define PWRMGT_LPCOMP_REFSEL 4 // 5/8 VDD (~3.13-3.44V)
// Defaults to AIN3 = P0.05 = PIN_A0 = the default PIN_VBAT_READ. Boards that
// sense VBAT elsewhere (e.g. a RAK19007 fed from J11 AIN1 = P0.03) can override
// this; keep it on the same pin as PIN_VBAT_READ.
#ifndef PWRMGT_LPCOMP_AIN
#define PWRMGT_LPCOMP_AIN 3
#endif
#ifndef PWRMGT_LPCOMP_REFSEL
#define PWRMGT_LPCOMP_REFSEL 4 // 5/8 VDD (~3.13-3.44V)
#endif

// Other pins
#define PIN_AREF (2)
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