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