esp-idf/examples/peripherals/adc/oneshot_read/main/oneshot_read_main.c

206 lines
7.4 KiB
C
Raw Normal View History

/*
* SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "soc/soc_caps.h"
#include "esp_log.h"
#include "esp_adc/adc_oneshot.h"
#include "esp_adc/adc_cali.h"
#include "esp_adc/adc_cali_scheme.h"
const static char *TAG = "EXAMPLE";
/*---------------------------------------------------------------
ADC General Macros
---------------------------------------------------------------*/
//ADC1 Channels
#if CONFIG_IDF_TARGET_ESP32
#define EXAMPLE_ADC1_CHAN0 ADC_CHANNEL_4
#define EXAMPLE_ADC1_CHAN1 ADC_CHANNEL_5
#else
#define EXAMPLE_ADC1_CHAN0 ADC_CHANNEL_2
#define EXAMPLE_ADC1_CHAN1 ADC_CHANNEL_3
#endif
#if (SOC_ADC_PERIPH_NUM >= 2) && !CONFIG_IDF_TARGET_ESP32C3
/**
* On ESP32C3, ADC2 is no longer supported, due to its HW limitation.
* Search for errata on espressif website for more details.
*/
#define EXAMPLE_USE_ADC2 1
#endif
#if EXAMPLE_USE_ADC2
//ADC2 Channels
#if CONFIG_IDF_TARGET_ESP32
#define EXAMPLE_ADC2_CHAN0 ADC_CHANNEL_0
#else
#define EXAMPLE_ADC2_CHAN0 ADC_CHANNEL_0
#endif
#endif //#if EXAMPLE_USE_ADC2
#define EXAMPLE_ADC_ATTEN ADC_ATTEN_DB_11
static int adc_raw[2][10];
static int voltage[2][10];
static bool example_adc_calibration_init(adc_unit_t unit, adc_channel_t channel, adc_atten_t atten, adc_cali_handle_t *out_handle);
static void example_adc_calibration_deinit(adc_cali_handle_t handle);
void app_main(void)
{
//-------------ADC1 Init---------------//
adc_oneshot_unit_handle_t adc1_handle;
adc_oneshot_unit_init_cfg_t init_config1 = {
.unit_id = ADC_UNIT_1,
};
ESP_ERROR_CHECK(adc_oneshot_new_unit(&init_config1, &adc1_handle));
//-------------ADC1 Config---------------//
adc_oneshot_chan_cfg_t config = {
.bitwidth = ADC_BITWIDTH_DEFAULT,
.atten = EXAMPLE_ADC_ATTEN,
};
ESP_ERROR_CHECK(adc_oneshot_config_channel(adc1_handle, EXAMPLE_ADC1_CHAN0, &config));
ESP_ERROR_CHECK(adc_oneshot_config_channel(adc1_handle, EXAMPLE_ADC1_CHAN1, &config));
//-------------ADC1 Calibration Init---------------//
adc_cali_handle_t adc1_cali_chan0_handle = NULL;
adc_cali_handle_t adc1_cali_chan1_handle = NULL;
bool do_calibration1_chan0 = example_adc_calibration_init(ADC_UNIT_1, EXAMPLE_ADC1_CHAN0, EXAMPLE_ADC_ATTEN, &adc1_cali_chan0_handle);
bool do_calibration1_chan1 = example_adc_calibration_init(ADC_UNIT_1, EXAMPLE_ADC1_CHAN1, EXAMPLE_ADC_ATTEN, &adc1_cali_chan1_handle);
#if EXAMPLE_USE_ADC2
//-------------ADC2 Init---------------//
adc_oneshot_unit_handle_t adc2_handle;
adc_oneshot_unit_init_cfg_t init_config2 = {
.unit_id = ADC_UNIT_2,
.ulp_mode = ADC_ULP_MODE_DISABLE,
};
ESP_ERROR_CHECK(adc_oneshot_new_unit(&init_config2, &adc2_handle));
//-------------ADC2 Calibration Init---------------//
adc_cali_handle_t adc2_cali_handle = NULL;
bool do_calibration2 = example_adc_calibration_init(ADC_UNIT_2, EXAMPLE_ADC2_CHAN0, EXAMPLE_ADC_ATTEN, &adc2_cali_handle);
//-------------ADC2 Config---------------//
ESP_ERROR_CHECK(adc_oneshot_config_channel(adc2_handle, EXAMPLE_ADC2_CHAN0, &config));
#endif //#if EXAMPLE_USE_ADC2
while (1) {
ESP_ERROR_CHECK(adc_oneshot_read(adc1_handle, EXAMPLE_ADC1_CHAN0, &adc_raw[0][0]));
ESP_LOGI(TAG, "ADC%d Channel[%d] Raw Data: %d", ADC_UNIT_1 + 1, EXAMPLE_ADC1_CHAN0, adc_raw[0][0]);
if (do_calibration1_chan0) {
ESP_ERROR_CHECK(adc_cali_raw_to_voltage(adc1_cali_chan0_handle, adc_raw[0][0], &voltage[0][0]));
ESP_LOGI(TAG, "ADC%d Channel[%d] Cali Voltage: %d mV", ADC_UNIT_1 + 1, EXAMPLE_ADC1_CHAN0, voltage[0][0]);
}
vTaskDelay(pdMS_TO_TICKS(1000));
ESP_ERROR_CHECK(adc_oneshot_read(adc1_handle, EXAMPLE_ADC1_CHAN1, &adc_raw[0][1]));
ESP_LOGI(TAG, "ADC%d Channel[%d] Raw Data: %d", ADC_UNIT_1 + 1, EXAMPLE_ADC1_CHAN1, adc_raw[0][1]);
if (do_calibration1_chan1) {
ESP_ERROR_CHECK(adc_cali_raw_to_voltage(adc1_cali_chan1_handle, adc_raw[0][1], &voltage[0][1]));
ESP_LOGI(TAG, "ADC%d Channel[%d] Cali Voltage: %d mV", ADC_UNIT_1 + 1, EXAMPLE_ADC1_CHAN1, voltage[0][1]);
}
vTaskDelay(pdMS_TO_TICKS(1000));
#if EXAMPLE_USE_ADC2
ESP_ERROR_CHECK(adc_oneshot_read(adc2_handle, EXAMPLE_ADC2_CHAN0, &adc_raw[1][0]));
ESP_LOGI(TAG, "ADC%d Channel[%d] Raw Data: %d", ADC_UNIT_2 + 1, EXAMPLE_ADC2_CHAN0, adc_raw[1][0]);
if (do_calibration2) {
ESP_ERROR_CHECK(adc_cali_raw_to_voltage(adc2_cali_handle, adc_raw[1][0], &voltage[1][0]));
ESP_LOGI(TAG, "ADC%d Channel[%d] Cali Voltage: %d mV", ADC_UNIT_2 + 1, EXAMPLE_ADC2_CHAN0, voltage[1][0]);
}
vTaskDelay(pdMS_TO_TICKS(1000));
#endif //#if EXAMPLE_USE_ADC2
}
//Tear Down
ESP_ERROR_CHECK(adc_oneshot_del_unit(adc1_handle));
if (do_calibration1_chan0) {
example_adc_calibration_deinit(adc1_cali_chan0_handle);
}
if (do_calibration1_chan1) {
example_adc_calibration_deinit(adc1_cali_chan1_handle);
}
#if EXAMPLE_USE_ADC2
ESP_ERROR_CHECK(adc_oneshot_del_unit(adc2_handle));
if (do_calibration2) {
example_adc_calibration_deinit(adc2_cali_handle);
}
#endif //#if EXAMPLE_USE_ADC2
}
/*---------------------------------------------------------------
ADC Calibration
---------------------------------------------------------------*/
static bool example_adc_calibration_init(adc_unit_t unit, adc_channel_t channel, adc_atten_t atten, adc_cali_handle_t *out_handle)
{
adc_cali_handle_t handle = NULL;
esp_err_t ret = ESP_FAIL;
bool calibrated = false;
#if ADC_CALI_SCHEME_CURVE_FITTING_SUPPORTED
if (!calibrated) {
ESP_LOGI(TAG, "calibration scheme version is %s", "Curve Fitting");
adc_cali_curve_fitting_config_t cali_config = {
.unit_id = unit,
.chan = channel,
.atten = atten,
.bitwidth = ADC_BITWIDTH_DEFAULT,
};
ret = adc_cali_create_scheme_curve_fitting(&cali_config, &handle);
if (ret == ESP_OK) {
calibrated = true;
}
}
#endif
#if ADC_CALI_SCHEME_LINE_FITTING_SUPPORTED
if (!calibrated) {
ESP_LOGI(TAG, "calibration scheme version is %s", "Line Fitting");
adc_cali_line_fitting_config_t cali_config = {
.unit_id = unit,
.atten = atten,
.bitwidth = ADC_BITWIDTH_DEFAULT,
};
ret = adc_cali_create_scheme_line_fitting(&cali_config, &handle);
if (ret == ESP_OK) {
calibrated = true;
}
}
#endif
*out_handle = handle;
if (ret == ESP_OK) {
ESP_LOGI(TAG, "Calibration Success");
} else if (ret == ESP_ERR_NOT_SUPPORTED || !calibrated) {
ESP_LOGW(TAG, "eFuse not burnt, skip software calibration");
} else {
ESP_LOGE(TAG, "Invalid arg or no memory");
}
return calibrated;
}
static void example_adc_calibration_deinit(adc_cali_handle_t handle)
{
#if ADC_CALI_SCHEME_CURVE_FITTING_SUPPORTED
ESP_LOGI(TAG, "deregister %s calibration scheme", "Curve Fitting");
ESP_ERROR_CHECK(adc_cali_delete_scheme_curve_fitting(handle));
#elif ADC_CALI_SCHEME_LINE_FITTING_SUPPORTED
ESP_LOGI(TAG, "deregister %s calibration scheme", "Line Fitting");
ESP_ERROR_CHECK(adc_cali_delete_scheme_line_fitting(handle));
#endif
}