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Improving T114 power consumption #683

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Merged
merged 2 commits into from
Aug 29, 2025
Merged

Improving T114 power consumption #683

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a16e011
modified T114 code to disable many unused peripherals, and set up the…
Aug 26, 2025
19978d6
Merge branch 'dev' into t114-power-consumption
Aug 29, 2025
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39 changes: 39 additions & 0 deletions src/helpers/nrf52/T114Board.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,45 @@ void T114Board::begin() {

pinMode(PIN_VBAT_READ, INPUT);

// Enable SoftDevice low-power mode
sd_power_mode_set(NRF_POWER_MODE_LOWPWR);

// Enable DC/DC converter for better efficiency (REG1 stage)
NRF_POWER->DCDCEN = 1;

// Power down unused communication peripherals
// UART1 - Not used on T114
NRF_UARTE1->ENABLE = 0;

// SPIM2/SPIS2 - Not used (SPI is on SPIM0)
NRF_SPIM2->ENABLE = 0;
NRF_SPIS2->ENABLE = 0;

// TWI1 (I2C1) - Not used (I2C is on TWI0)
NRF_TWIM1->ENABLE = 0;
NRF_TWIS1->ENABLE = 0;

// PWM modules - Not used for standard T114 functions
NRF_PWM1->ENABLE = 0;
NRF_PWM2->ENABLE = 0;
NRF_PWM3->ENABLE = 0;

// PDM (Digital Microphone Interface) - Not used
NRF_PDM->ENABLE = 0;

// I2S - Not used
NRF_I2S->ENABLE = 0;

// QSPI - Not used (no external flash)
NRF_QSPI->ENABLE = 0;

// Disable unused analog peripherals
// SAADC channels - only keep what's needed for battery monitoring
NRF_SAADC->ENABLE = 0; // Re-enable only when needed for measurements

// COMP - Comparator not used
NRF_COMP->ENABLE = 0;

#if defined(PIN_BOARD_SDA) && defined(PIN_BOARD_SCL)
Wire.setPins(PIN_BOARD_SDA, PIN_BOARD_SCL);
#endif
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5 changes: 5 additions & 0 deletions src/helpers/nrf52/T114Board.h
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Expand Up @@ -40,6 +40,9 @@ class T114Board : public mesh::MainBoard {

uint16_t getBattMilliVolts() override {
int adcvalue = 0;

NRF_SAADC->ENABLE = 1;

analogReadResolution(12);
analogReference(AR_INTERNAL_3_0);
pinMode(PIN_BAT_CTL, OUTPUT); // battery adc can be read only ctrl pin 6 set to high
Expand All @@ -49,6 +52,8 @@ class T114Board : public mesh::MainBoard {
adcvalue = analogRead(PIN_VBAT_READ);
digitalWrite(6, 0);

NRF_SAADC->ENABLE = 0;

return (uint16_t)((float)adcvalue * MV_LSB * 4.9);
}

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