A timing app designed to run on my Odroid-GO
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1.6 KiB

#include "battery.h"
#include <driver/adc.h>
#include <esp_adc_cal.h>
#include <esp_log.h>
#include <soc/adc_channel.h>
static const char* LOG_TAG = "OdroidBattery";
static const adc1_channel_t BATTERY_READ_PIN = ADC1_GPIO36_CHANNEL;
static const gpio_num_t BATTERY_LED_PIN = GPIO_NUM_2;
static esp_adc_cal_characteristics_t gCharacteristics;
void Odroid_InitializeBatteryReader()
{
// Configure LED
{
gpio_config_t gpioConfig = {};
gpioConfig.mode = GPIO_MODE_OUTPUT;
gpioConfig.pin_bit_mask = 1ULL << BATTERY_LED_PIN;
ESP_ERROR_CHECK(gpio_config(&gpioConfig));
}
// Configure ADC
{
adc1_config_width(ADC_WIDTH_BIT_12);
adc1_config_channel_atten(BATTERY_READ_PIN, ADC_ATTEN_DB_11);
adc1_config_channel_atten(BATTERY_READ_PIN, ADC_ATTEN_DB_11);
esp_adc_cal_value_t type = esp_adc_cal_characterize(
ADC_UNIT_1, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_12, 1100, &gCharacteristics);
// The ESP32 in the Odroid Go should have its fuse set with a pre-calibrated vref
assert(type == ESP_ADC_CAL_VAL_EFUSE_VREF);
}
ESP_LOGI(LOG_TAG, "Battery reader initialized");
}
uint32_t Odroid_ReadBatteryLevel(void)
{
const int SAMPLE_COUNT = 20;
uint32_t raw = 0;
for (int sampleIndex = 0; sampleIndex < SAMPLE_COUNT; ++sampleIndex)
{
raw += adc1_get_raw(BATTERY_READ_PIN);
}
raw /= SAMPLE_COUNT;
// Voltage divider reports half actual voltage
uint32_t voltage = 2 * esp_adc_cal_raw_to_voltage(raw, &gCharacteristics);
return voltage;
}
void Odroid_EnableBatteryLight(void)
{
gpio_set_level(BATTERY_LED_PIN, 1);
}
void Odroid_DisableBatteryLight(void)
{
gpio_set_level(BATTERY_LED_PIN, 0);
}