battery.c

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#ifdef LOOK_AT_THIS_TO_SEE_IF_CAN_USE
#include "driver/gpio.h"
#include "driver/adc.h"
#include "esp_adc_cal.h"
#include "soc/adc_channel.h"
#include "stdlib.h"
 
#define BAT_OUTPUT_HOLD_PIN 33
#define BAT_ADC_PIN 38
 
#define BAT_ADC_CHANNEL ADC1_GPIO38_CHANNEL
 
#define BASE_VOLATAGE 3600
#define SCALE 0.661
#define ADC_FILTER_SAMPLE 64
 
static esp_adc_cal_characteristics_t *adc_chars;
 
void bat_init() {
    // hold bat power, if set 0, bat power disable
    gpio_pad_select_gpio(BAT_OUTPUT_HOLD_PIN);
    gpio_set_direction(BAT_OUTPUT_HOLD_PIN, GPIO_MODE_OUTPUT);
    gpio_set_level(BAT_OUTPUT_HOLD_PIN, 1);
 
    // init adc to read bat voltage 
    adc1_config_width(ADC_WIDTH_BIT_12);
    adc1_config_channel_atten(BAT_ADC_CHANNEL, ADC_ATTEN_DB_11);
    adc_chars = calloc(1, sizeof(esp_adc_cal_characteristics_t));
    esp_adc_cal_characterize(ADC_UNIT_1, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_12, BASE_VOLATAGE, adc_chars);
}
 
void bat_hold_output() {
    gpio_set_level(BAT_OUTPUT_HOLD_PIN, 1);
}
 
void bat_disable_output() {
    gpio_set_level(BAT_OUTPUT_HOLD_PIN, 0);
}
 
uint32_t bat_get_adc_raw() {
    return adc1_get_raw(BAT_ADC_CHANNEL);
}
 
uint32_t bat_get_voltage() {
    uint32_t adc_raw_value = 0;
    for (uint16_t i = 0; i < ADC_FILTER_SAMPLE; i++) {
        adc_raw_value += adc1_get_raw(BAT_ADC_CHANNEL);
    }
 
    adc_raw_value = adc_raw_value / ADC_FILTER_SAMPLE;
    uint32_t voltage = (uint32_t)(esp_adc_cal_raw_to_voltage(adc_raw_value, adc_chars) / SCALE);
    return voltage;
}
 
 
#endif