mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
39 lines
1.3 KiB
C
39 lines
1.3 KiB
C
|
/*
|
||
|
|
* SPDX-FileCopyrightText: 2020-2021 Espressif Systems (Shanghai) CO LTD
|
||
|
|
*
|
||
|
|
* SPDX-License-Identifier: Apache-2.0
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <stdint.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include "esp_types.h"
|
||
|
|
#include "esp_err.h"
|
||
|
|
#include "esp_log.h"
|
||
|
|
#include "esp_check.h"
|
||
|
|
#include "driver/adc.h"
|
||
|
|
#include "hal/adc_types.h"
|
||
|
|
#include "esp_adc_cal.h"
|
||
|
|
|
||
|
|
const static char *TAG = "ADC_CALI";
|
||
|
|
|
||
|
|
esp_err_t esp_adc_cal_get_voltage(adc_channel_t channel,
|
||
|
|
const esp_adc_cal_characteristics_t *chars,
|
||
|
|
uint32_t *voltage)
|
||
|
|
{
|
||
|
|
// Check parameters
|
||
|
|
ESP_RETURN_ON_FALSE(chars != NULL, ESP_ERR_INVALID_ARG, TAG, "No characteristic input");
|
||
|
|
ESP_RETURN_ON_FALSE(voltage != NULL, ESP_ERR_INVALID_ARG, TAG, "No output buffer");
|
||
|
|
|
||
|
|
esp_err_t ret = ESP_OK;
|
||
|
|
int adc_reading;
|
||
|
|
if (chars->adc_num == ADC_UNIT_1) {
|
||
|
|
ESP_RETURN_ON_FALSE(channel < SOC_ADC_CHANNEL_NUM(0), ESP_ERR_INVALID_ARG, TAG, "Invalid channel");
|
||
|
|
adc_reading = adc1_get_raw(channel);
|
||
|
|
} else {
|
||
|
|
ESP_RETURN_ON_FALSE(channel < SOC_ADC_CHANNEL_NUM(1), ESP_ERR_INVALID_ARG, TAG, "Invalid channel");
|
||
|
|
ret = adc2_get_raw(channel, chars->bit_width, &adc_reading);
|
||
|
|
}
|
||
|
|
*voltage = esp_adc_cal_raw_to_voltage((uint32_t)adc_reading, chars);
|
||
|
|
return ret;
|
||
|
|
}
|