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xiao-nrf keep vbat_en to low to prevent issues ...

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Florent
2025-04-20 16:32:46 +02:00
parent 7b1582a0b9
commit 6735960a4e
2 changed files with 21 additions and 17 deletions
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24
src/helpers/nrf52/XiaoNrf52Board.h
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@@ -49,20 +49,16 @@ public:
// Please read befor going further ;)
// https://wiki.seeedstudio.com/XIAO_BLE#q3-what-are-the-considerations-when-using-xiao-nrf52840-sense-for-battery-charging
pinMode(BAT_NOT_CHARGING, INPUT);
if (digitalRead(BAT_NOT_CHARGING) == HIGH) {
int adcvalue = 0;
analogReadResolution(12);
analogReference(AR_INTERNAL_3_0);
digitalWrite(VBAT_ENABLE, LOW);
delay(10);
adcvalue = analogRead(PIN_VBAT);
digitalWrite(VBAT_ENABLE, HIGH);
return (adcvalue * ADC_MULTIPLIER * AREF_VOLTAGE) / 4.096;
} else {
digitalWrite(VBAT_ENABLE, HIGH); // ensures high !
return 4200; // charging value
}
// We can't drive VBAT_ENABLE to HIGH as long
// as we don't know wether we are charging or not ...
// this is a 3mA loss (4/1500)
digitalWrite(VBAT_ENABLE, LOW);
int adcvalue = 0;
analogReadResolution(12);
analogReference(AR_INTERNAL_3_0);
delay(10);
adcvalue = analogRead(PIN_VBAT);
return (adcvalue * ADC_MULTIPLIER * AREF_VOLTAGE) / 4.096;
}
const char* getManufacturerName() const override {

14
variants/xiao_nrf52/variant.cpp
View File

@@ -60,11 +60,19 @@ void initVariant()
// Disable reading of the BAT voltage.
// https://wiki.seeedstudio.com/XIAO_BLE#q3-what-are-the-considerations-when-using-xiao-nrf52840-sense-for-battery-charging
pinMode(VBAT_ENABLE, OUTPUT);
digitalWrite(VBAT_ENABLE, HIGH);
//digitalWrite(VBAT_ENABLE, HIGH);
// This was taken from Seeed github butis not coherent with the doc,
// VBAT_ENABLE should be kept to LOW to protect P0.14, (1500/500)*(4.2-3.3)+3.3 = 3.9V > 3.6V
// This induces a 3mA current in the resistors :( but it's better than burning the nrf
digitalWrite(VBAT_ENABLE, LOW);
// Low charging current.
// Low charging current (50mA)
// https://wiki.seeedstudio.com/XIAO_BLE#battery-charging-current
pinMode(PIN_CHARGING_CURRENT, INPUT);
//pinMode(PIN_CHARGING_CURRENT, INPUT);
// High charging current (100mA)
pinMode(PIN_CHARGING_CURRENT, OUTPUT);
digitalWrite(PIN_CHARGING_CURRENT, LOW);
pinMode(PIN_QSPI_CS, OUTPUT);
digitalWrite(PIN_QSPI_CS, HIGH);