mirror of
https://github.com/espressif/esp-idf.git
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f01a40afe2
By design, it's 12 dB. There're errors among chips, so the actual attenuation will be 11dB more or less
203 lines
7.4 KiB
C
203 lines
7.4 KiB
C
/*
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* SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "soc/soc_caps.h"
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#include "esp_log.h"
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#include "esp_adc/adc_oneshot.h"
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#include "esp_adc/adc_cali.h"
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#include "esp_adc/adc_cali_scheme.h"
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const static char *TAG = "EXAMPLE";
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/*---------------------------------------------------------------
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ADC General Macros
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---------------------------------------------------------------*/
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//ADC1 Channels
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#if CONFIG_IDF_TARGET_ESP32
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#define EXAMPLE_ADC1_CHAN0 ADC_CHANNEL_4
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#define EXAMPLE_ADC1_CHAN1 ADC_CHANNEL_5
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#else
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#define EXAMPLE_ADC1_CHAN0 ADC_CHANNEL_2
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#define EXAMPLE_ADC1_CHAN1 ADC_CHANNEL_3
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#endif
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#if (SOC_ADC_PERIPH_NUM >= 2) && !CONFIG_IDF_TARGET_ESP32C3
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/**
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* On ESP32C3, ADC2 is no longer supported, due to its HW limitation.
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* Search for errata on espressif website for more details.
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*/
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#define EXAMPLE_USE_ADC2 1
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#endif
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#if EXAMPLE_USE_ADC2
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//ADC2 Channels
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#if CONFIG_IDF_TARGET_ESP32
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#define EXAMPLE_ADC2_CHAN0 ADC_CHANNEL_0
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#else
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#define EXAMPLE_ADC2_CHAN0 ADC_CHANNEL_0
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#endif
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#endif //#if EXAMPLE_USE_ADC2
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#define EXAMPLE_ADC_ATTEN ADC_ATTEN_DB_12
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static int adc_raw[2][10];
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static int voltage[2][10];
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static bool example_adc_calibration_init(adc_unit_t unit, adc_channel_t channel, adc_atten_t atten, adc_cali_handle_t *out_handle);
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static void example_adc_calibration_deinit(adc_cali_handle_t handle);
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void app_main(void)
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{
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//-------------ADC1 Init---------------//
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adc_oneshot_unit_handle_t adc1_handle;
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adc_oneshot_unit_init_cfg_t init_config1 = {
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.unit_id = ADC_UNIT_1,
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};
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ESP_ERROR_CHECK(adc_oneshot_new_unit(&init_config1, &adc1_handle));
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//-------------ADC1 Config---------------//
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adc_oneshot_chan_cfg_t config = {
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.bitwidth = ADC_BITWIDTH_DEFAULT,
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.atten = EXAMPLE_ADC_ATTEN,
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};
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ESP_ERROR_CHECK(adc_oneshot_config_channel(adc1_handle, EXAMPLE_ADC1_CHAN0, &config));
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ESP_ERROR_CHECK(adc_oneshot_config_channel(adc1_handle, EXAMPLE_ADC1_CHAN1, &config));
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//-------------ADC1 Calibration Init---------------//
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adc_cali_handle_t adc1_cali_chan0_handle = NULL;
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adc_cali_handle_t adc1_cali_chan1_handle = NULL;
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bool do_calibration1_chan0 = example_adc_calibration_init(ADC_UNIT_1, EXAMPLE_ADC1_CHAN0, EXAMPLE_ADC_ATTEN, &adc1_cali_chan0_handle);
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bool do_calibration1_chan1 = example_adc_calibration_init(ADC_UNIT_1, EXAMPLE_ADC1_CHAN1, EXAMPLE_ADC_ATTEN, &adc1_cali_chan1_handle);
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#if EXAMPLE_USE_ADC2
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//-------------ADC2 Init---------------//
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adc_oneshot_unit_handle_t adc2_handle;
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adc_oneshot_unit_init_cfg_t init_config2 = {
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.unit_id = ADC_UNIT_2,
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.ulp_mode = ADC_ULP_MODE_DISABLE,
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};
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ESP_ERROR_CHECK(adc_oneshot_new_unit(&init_config2, &adc2_handle));
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//-------------ADC2 Calibration Init---------------//
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adc_cali_handle_t adc2_cali_handle = NULL;
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bool do_calibration2 = example_adc_calibration_init(ADC_UNIT_2, EXAMPLE_ADC2_CHAN0, EXAMPLE_ADC_ATTEN, &adc2_cali_handle);
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//-------------ADC2 Config---------------//
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ESP_ERROR_CHECK(adc_oneshot_config_channel(adc2_handle, EXAMPLE_ADC2_CHAN0, &config));
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#endif //#if EXAMPLE_USE_ADC2
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while (1) {
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ESP_ERROR_CHECK(adc_oneshot_read(adc1_handle, EXAMPLE_ADC1_CHAN0, &adc_raw[0][0]));
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ESP_LOGI(TAG, "ADC%d Channel[%d] Raw Data: %d", ADC_UNIT_1 + 1, EXAMPLE_ADC1_CHAN0, adc_raw[0][0]);
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if (do_calibration1_chan0) {
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ESP_ERROR_CHECK(adc_cali_raw_to_voltage(adc1_cali_chan0_handle, adc_raw[0][0], &voltage[0][0]));
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ESP_LOGI(TAG, "ADC%d Channel[%d] Cali Voltage: %d mV", ADC_UNIT_1 + 1, EXAMPLE_ADC1_CHAN0, voltage[0][0]);
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}
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vTaskDelay(pdMS_TO_TICKS(1000));
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ESP_ERROR_CHECK(adc_oneshot_read(adc1_handle, EXAMPLE_ADC1_CHAN1, &adc_raw[0][1]));
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ESP_LOGI(TAG, "ADC%d Channel[%d] Raw Data: %d", ADC_UNIT_1 + 1, EXAMPLE_ADC1_CHAN1, adc_raw[0][1]);
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if (do_calibration1_chan1) {
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ESP_ERROR_CHECK(adc_cali_raw_to_voltage(adc1_cali_chan1_handle, adc_raw[0][1], &voltage[0][1]));
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ESP_LOGI(TAG, "ADC%d Channel[%d] Cali Voltage: %d mV", ADC_UNIT_1 + 1, EXAMPLE_ADC1_CHAN1, voltage[0][1]);
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}
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vTaskDelay(pdMS_TO_TICKS(1000));
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#if EXAMPLE_USE_ADC2
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ESP_ERROR_CHECK(adc_oneshot_read(adc2_handle, EXAMPLE_ADC2_CHAN0, &adc_raw[1][0]));
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ESP_LOGI(TAG, "ADC%d Channel[%d] Raw Data: %d", ADC_UNIT_2 + 1, EXAMPLE_ADC2_CHAN0, adc_raw[1][0]);
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if (do_calibration2) {
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ESP_ERROR_CHECK(adc_cali_raw_to_voltage(adc2_cali_handle, adc_raw[1][0], &voltage[1][0]));
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ESP_LOGI(TAG, "ADC%d Channel[%d] Cali Voltage: %d mV", ADC_UNIT_2 + 1, EXAMPLE_ADC2_CHAN0, voltage[1][0]);
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}
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vTaskDelay(pdMS_TO_TICKS(1000));
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#endif //#if EXAMPLE_USE_ADC2
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}
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//Tear Down
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ESP_ERROR_CHECK(adc_oneshot_del_unit(adc1_handle));
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if (do_calibration1_chan0) {
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example_adc_calibration_deinit(adc1_cali_chan0_handle);
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}
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if (do_calibration1_chan1) {
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example_adc_calibration_deinit(adc1_cali_chan1_handle);
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}
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#if EXAMPLE_USE_ADC2
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ESP_ERROR_CHECK(adc_oneshot_del_unit(adc2_handle));
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if (do_calibration2) {
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example_adc_calibration_deinit(adc2_cali_handle);
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}
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#endif //#if EXAMPLE_USE_ADC2
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}
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/*---------------------------------------------------------------
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ADC Calibration
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---------------------------------------------------------------*/
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static bool example_adc_calibration_init(adc_unit_t unit, adc_channel_t channel, adc_atten_t atten, adc_cali_handle_t *out_handle)
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{
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adc_cali_handle_t handle = NULL;
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esp_err_t ret = ESP_FAIL;
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bool calibrated = false;
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#if ADC_CALI_SCHEME_CURVE_FITTING_SUPPORTED
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if (!calibrated) {
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ESP_LOGI(TAG, "calibration scheme version is %s", "Curve Fitting");
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adc_cali_curve_fitting_config_t cali_config = {
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.unit_id = unit,
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.chan = channel,
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.atten = atten,
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.bitwidth = ADC_BITWIDTH_DEFAULT,
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};
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ret = adc_cali_create_scheme_curve_fitting(&cali_config, &handle);
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if (ret == ESP_OK) {
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calibrated = true;
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}
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}
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#endif
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#if ADC_CALI_SCHEME_LINE_FITTING_SUPPORTED
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if (!calibrated) {
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ESP_LOGI(TAG, "calibration scheme version is %s", "Line Fitting");
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adc_cali_line_fitting_config_t cali_config = {
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.unit_id = unit,
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.atten = atten,
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.bitwidth = ADC_BITWIDTH_DEFAULT,
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};
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ret = adc_cali_create_scheme_line_fitting(&cali_config, &handle);
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if (ret == ESP_OK) {
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calibrated = true;
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}
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}
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#endif
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*out_handle = handle;
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if (ret == ESP_OK) {
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ESP_LOGI(TAG, "Calibration Success");
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} else if (ret == ESP_ERR_NOT_SUPPORTED || !calibrated) {
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ESP_LOGW(TAG, "eFuse not burnt, skip software calibration");
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} else {
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ESP_LOGE(TAG, "Invalid arg or no memory");
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}
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return calibrated;
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}
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static void example_adc_calibration_deinit(adc_cali_handle_t handle)
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{
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#if ADC_CALI_SCHEME_CURVE_FITTING_SUPPORTED
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ESP_LOGI(TAG, "deregister %s calibration scheme", "Curve Fitting");
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ESP_ERROR_CHECK(adc_cali_delete_scheme_curve_fitting(handle));
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#elif ADC_CALI_SCHEME_LINE_FITTING_SUPPORTED
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ESP_LOGI(TAG, "deregister %s calibration scheme", "Line Fitting");
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ESP_ERROR_CHECK(adc_cali_delete_scheme_line_fitting(handle));
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#endif
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}
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