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Power: set the AXP2101 charge voltage to 4.2V at init (CoreS3 family, Core2 v1.1) #392

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Merged
lovyan03 merged 1 commit into from
Oct 7, 2026
Merged

Power: set the AXP2101 charge voltage to 4.2V at init (CoreS3 family, Core2 v1.1) #392

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6 changes: 6 additions & 0 deletions src/utility/Power_Class.inl
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Original file line number Diff line number Diff line change
Expand Up @@ -443,6 +443,10 @@ namespace m5
// TS senses the 5V bus (no battery thermistor). Its power-on default comes from the
// EFUSE and differs between chips; when it is left as the temperature input, the
// charger treats the bus voltage as a cold battery and never charges.
// The charge voltage (0x64) is not always at the datasheet default either: a unit read 0x00,
// which is reserved (4.6V in an early datasheet revision). The cell is a 4.2V type.
// Set it before the TS change below lets the charger start.
if (!Axp2101.setChargeVoltage(4200)) { ESP_LOGW("Power", "AXP2101: failed to set the charge voltage."); }
Axp2101.bitOn(0x50, 0x10); // TS pin: external input, does not affect the charger
// The touch INT is routed to the ESP32 as TOUCH_INT -> AW9523 P1_2 -> AW9523 INTN
// -> I2C_INT -> GPIO21. The power key is wired to the AXP2101 PWRON only, and the
Expand Down Expand Up @@ -911,6 +915,8 @@ namespace m5
// setExtOutput) makes the AXP2101 power itself off, and it stays off until the power
// key; let the ESP32 brown out and restart instead. Over-voltage (bit 5) stays enabled.
Axp2101.bitOff(0x23, 0x1F); // DCDC1-5 UVP power-off disable
// Charge voltage: the power-on value may be reserved; see the CoreS3 setup.
if (!Axp2101.setChargeVoltage(4200)) { ESP_LOGW("Power", "AXP2101: failed to set the charge voltage."); }
// No battery thermistor on TS (reads about 2.9V); see the CoreS3 setup.
Axp2101.bitOn(0x50, 0x10); // TS pin: external input, does not affect the charger

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