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Fix Nicla Sense battery charge #588

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Merged
merged 2 commits into from
Dec 21, 2022
Merged

Fix Nicla Sense battery charge #588

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fc7b392
Nicla: tune PMIC charger
facchinm Nov 23, 2022
d9732f9
nicla: also disable NTC stopping charge via API
facchinm Dec 1, 2022
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21 changes: 20 additions & 1 deletion libraries/Nicla_System/src/Nicla_System.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -106,16 +106,35 @@ uint8_t nicla::readLDOreg()

bool nicla::enableCharge(uint8_t mA)
{
digitalWrite(p25, LOW);
if (mA < 35) {
_chg_reg = ((mA-5) << 2);
} else {
_chg_reg = (((mA-40)/10) << 2) | 0x80;
}
_pmic.writeByte(BQ25120A_ADDRESS, BQ25120A_FAST_CHG, _chg_reg);

// For very depleted batteries, set ULVO at the vary minimum to re-enable charging
_pmic.writeByte(BQ25120A_ADDRESS, BQ25120A_ILIM_UVLO_CTRL, 0x3F);

// also set max battery voltage to 4.2V (VBREG)
// _pmic.writeByte(BQ25120A_ADDRESS, BQ25120A_BATTERY_CTRL, (4.2f - 3.6f)*100);

return _pmic.readByte(BQ25120A_ADDRESS, BQ25120A_FAST_CHG) == _chg_reg;
}

uint8_t nicla::getFault() {
return _pmic.readByte(BQ25120A_ADDRESS, BQ25120A_FAULTS);
}


float nicla::getBetteryStatus() {
_pmic.writeByte(BQ25120A_ADDRESS, BQ25120A_BATT_MON, 1);
delay(2);
uint8_t data = _pmic.readByte(BQ25120A_ADDRESS, BQ25120A_BATT_MON);
float res = 0.6f + (data >> 5) * 0.1f + (data >> 2) * 0.02f - 0.01f;
return res;
}

void nicla::checkChgReg()
{
if (_chg_reg != _pmic.readByte(BQ25120A_ADDRESS, BQ25120A_FAST_CHG)) {
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2 changes: 2 additions & 0 deletions libraries/Nicla_System/src/Nicla_System.h
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Expand Up @@ -20,6 +20,8 @@ class nicla {
static bool enterShipMode();
static uint8_t readLDOreg();
static bool enableCharge(uint8_t mA = 20);
static float getBetteryStatus();
static uint8_t getFault();

static RGBled leds;
static BQ25120A _pmic;
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