84 lines
2.8 KiB
C++
84 lines
2.8 KiB
C++
#include "BatteryController.h"
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#include <hal/nrf_gpio.h>
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#include <nrfx_saadc.h>
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#include <libraries/log/nrf_log.h>
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#include <algorithm>
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#include <math.h>
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using namespace Pinetime::Controllers;
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Battery* Battery::instance = nullptr;
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Battery::Battery() {
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instance = this;
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}
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void Battery::Init() {
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nrf_gpio_cfg_input(chargingPin, (nrf_gpio_pin_pull_t) GPIO_PIN_CNF_PULL_Pullup);
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nrf_gpio_cfg_input(powerPresentPin, (nrf_gpio_pin_pull_t) GPIO_PIN_CNF_PULL_Pullup);
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}
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void Battery::Update() {
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isCharging = !nrf_gpio_pin_read(chargingPin);
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isPowerPresent = !nrf_gpio_pin_read(powerPresentPin);
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if (isReading)
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return;
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// Non blocking read
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samples = 0;
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isReading = true;
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SaadcInit();
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nrfx_saadc_sample();
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}
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void Battery::adcCallbackStatic(nrfx_saadc_evt_t const* event) {
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instance->SaadcEventHandler(event);
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}
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void Battery::SaadcInit() {
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nrfx_saadc_config_t adcConfig = NRFX_SAADC_DEFAULT_CONFIG;
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APP_ERROR_CHECK(nrfx_saadc_init(&adcConfig, adcCallbackStatic));
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nrf_saadc_channel_config_t adcChannelConfig = {.resistor_p = NRF_SAADC_RESISTOR_DISABLED,
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.resistor_n = NRF_SAADC_RESISTOR_DISABLED,
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.gain = NRF_SAADC_GAIN1_5,
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.reference = NRF_SAADC_REFERENCE_INTERNAL,
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.acq_time = NRF_SAADC_ACQTIME_3US,
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.mode = NRF_SAADC_MODE_SINGLE_ENDED,
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.burst = NRF_SAADC_BURST_ENABLED,
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.pin_p = batteryVoltageAdcInput,
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.pin_n = NRF_SAADC_INPUT_DISABLED};
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APP_ERROR_CHECK(nrfx_saadc_channel_init(0, &adcChannelConfig));
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APP_ERROR_CHECK(nrfx_saadc_buffer_convert(&saadc_value, 1));
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}
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void Battery::SaadcEventHandler(nrfx_saadc_evt_t const* p_event) {
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const float battery_max = 4.18; // maximum voltage of battery ( max charging voltage is 4.21 )
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const float battery_min = 3.20; // minimum voltage of battery before shutdown ( depends on the battery )
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if (p_event->type == NRFX_SAADC_EVT_DONE) {
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APP_ERROR_CHECK(nrfx_saadc_buffer_convert(&saadc_value, 1));
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voltage = (static_cast<float>(p_event->data.done.p_buffer[0]) * 2.04f) / (1024 / 3.0f);
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voltage = roundf(voltage * 100) / 100;
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percentRemaining = static_cast<int>(((voltage - battery_min) / (battery_max - battery_min)) * 100);
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percentRemaining = std::max(percentRemaining, 0);
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percentRemaining = std::min(percentRemaining, 100);
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percentRemainingBuffer.insert(percentRemaining);
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samples++;
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if (samples > percentRemainingSamples) {
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nrfx_saadc_uninit();
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isReading = false;
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} else {
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nrfx_saadc_sample();
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}
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}
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}
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