esp-idf/components/driver/esp32s2/adc2_init_cal.c

32 wiersze
1.1 KiB
C

/*
* SPDX-FileCopyrightText: 2016-2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
/* This file is used to get `adc2_init_code_calibration` executed before the APP when the ADC2 is used by Wi-Fi or other drivers.
The linker will link constructor (adc2_init_code_calibration) only when any sections inside the same file (adc2_cal_include) is used.
Don't put any other code into this file. */
#include "adc2_wifi_private.h"
#include "hal/adc_hal.h"
#include "esp_private/adc_cali.h"
/**
* @brief Set initial code to ADC2 after calibration. ADC2 RTC and ADC2 PWDET controller share the initial code.
* This API be called in before `app_main()`.
*/
static __attribute__((constructor)) void adc2_init_code_calibration(void)
{
const adc_ll_num_t adc_n = ADC_NUM_2;
const adc_atten_t atten = ADC_ATTEN_DB_12;
const adc_channel_t channel = 0;
adc_cal_offset(adc_n, channel, atten);
}
/** Don't call `adc2_cal_include` in user code. */
void adc2_cal_include(void)
{
/* When this empty function is called, the `adc2_init_code_calibration` constructor will be linked and executed before the app.*/
}