testing battery probe (experimental)
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@ -14,7 +14,7 @@
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;env_default = heltec
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;env_default = ttgov1
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;env_default = ttgov2
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;env_default = ttgov21
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env_default = ttgov21
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;env_default = lopy
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;env_default = lopy4
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;env_default = fipy
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@ -18,10 +18,6 @@
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// Local logging tag
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static const char TAG[] = "main";
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static const adc_channel_t channel = (adc_channel_t) HAS_BATTERY_PROBE;
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static const adc_atten_t atten = ADC_ATTEN_DB_0;
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static const adc_unit_t unit = ADC_UNIT_1;
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static void check_efuse()
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{
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//Check if two point calibration values are burned into eFuse
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@ -52,35 +48,31 @@ static void print_char_val_type(esp_adc_cal_value_t val_type)
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uint16_t read_voltage(void)
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{
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static const adc1_channel_t channel = HAS_BATTERY_PROBE;
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static const adc_atten_t atten = ADC_ATTEN_DB_0;
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static const adc_unit_t unit = ADC_UNIT_1;
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//Check if Two Point or Vref are burned into eFuse
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check_efuse();
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//Configure ADC
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if (unit == ADC_UNIT_1) {
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adc1_config_width(ADC_WIDTH_BIT_12);
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adc1_config_channel_atten((adc1_channel_t)channel, atten);
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} else {
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adc2_config_channel_atten((adc2_channel_t)channel, atten);
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}
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//Configure ADC1
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adc1_config_width(ADC_WIDTH_BIT_12);
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adc1_config_channel_atten(channel, atten);
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//Characterize ADC
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//Characterize ADC1
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esp_adc_cal_characteristics_t *adc_chars = (esp_adc_cal_characteristics_t *) calloc(1, sizeof(esp_adc_cal_characteristics_t));
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esp_adc_cal_value_t val_type = esp_adc_cal_characterize(unit, atten, ADC_WIDTH_BIT_12, DEFAULT_VREF, adc_chars);
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print_char_val_type(val_type);
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//sample ADC
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//sample ADC1
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uint32_t adc_reading = 0;
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//Multisampling
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for (int i = 0; i < NO_OF_SAMPLES; i++) {
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if (unit == ADC_UNIT_1) {
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adc_reading += adc1_get_raw((adc1_channel_t)channel);
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} else {
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int raw;
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adc2_get_raw((adc2_channel_t)channel, ADC_WIDTH_BIT_12, &raw);
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adc_reading += raw;
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}
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adc_reading += adc1_get_raw(channel);
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}
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adc_reading /= NO_OF_SAMPLES;
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//Convert adc_reading to voltage in mV
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uint32_t voltage = esp_adc_cal_raw_to_voltage(adc_reading, adc_chars);
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ESP_LOGI(TAG,"Raw: %d\tVoltage: %dmV", adc_reading, voltage);
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@ -5,7 +5,7 @@
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#define HAS_DISPLAY U8X8_SSD1306_128X64_NONAME_HW_I2C
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#define DISPLAY_FLIP 1 // rotated display
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#define HAS_LED 23 // green on board LED_G3 (not in initial board version)
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#define HAS_BATTERY_PROBE ADC1_GPIO35_CHANNEL // battery probe GPIO pin -> ADC_CHANNEL_7
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#define HAS_BATTERY_PROBE ADC1_GPIO35_CHANNEL // battery probe GPIO pin -> ADC1_CHANNEL_7
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// re-define pin definitions of pins_arduino.h
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#define PIN_SPI_SS 18 // ESP32 GPIO18 (Pin18) -- HPD13A NSS/SEL (Pin4) SPI Chip Select Input
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