ESP-IDF
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Outline
#include "sdkconfig.h"
#include "ulp_adc.h"
#include "esp_err.h"
#include "esp_check.h"
#include "esp_log.h"
#include "esp_adc/adc_oneshot.h"
#include "hal/adc_hal_common.h"
#include "esp_private/esp_sleep_internal.h"
#include "esp_private/adc_share_hw_ctrl.h"
TAG
s_adc1_handle
ulp_adc_init(const ulp_adc_cfg_t *)
ulp_adc_deinit()
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SourceVuESP-IDF Framework and ExamplesESP-IDFcomponents/ulp/ulp_common/ulp_adc.c
 
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/* * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 *//* ... */ #include "sdkconfig.h" #include "ulp_adc.h" #include "esp_err.h" #include "esp_check.h" #include "esp_log.h" #include "esp_adc/adc_oneshot.h" #include "hal/adc_hal_common.h" #include "esp_private/esp_sleep_internal.h" #include "esp_private/adc_share_hw_ctrl.h"9 includes static const char *TAG = "ulp_adc"; static adc_oneshot_unit_handle_t s_adc1_handle = NULL; esp_err_t ulp_adc_init(const ulp_adc_cfg_t *cfg) { esp_err_t ret = ESP_OK; ESP_RETURN_ON_FALSE(cfg, ESP_ERR_INVALID_ARG, TAG, "cfg == NULL"); ESP_RETURN_ON_FALSE(cfg->adc_n == ADC_UNIT_1, ESP_ERR_INVALID_ARG, TAG, "Only ADC_UNIT_1 is supported for now"); //-------------ADC1 Init---------------// adc_oneshot_unit_init_cfg_t init_config1 = { .unit_id = cfg->adc_n, .ulp_mode = cfg->ulp_mode, }{...}; if (init_config1.ulp_mode == ADC_ULP_MODE_DISABLE) { /* Default to RISCV for backward compatibility */ ESP_LOGI(TAG, "No ulp mode specified in cfg struct, default to riscv"); init_config1.ulp_mode = ADC_ULP_MODE_RISCV; }{...} ret = adc_oneshot_new_unit(&init_config1, &s_adc1_handle); if (ret != ESP_OK) { return ret; }{...} ADC1 Init //-------------ADC1 Config---------------// adc_oneshot_chan_cfg_t config = { .bitwidth = cfg->width, .atten = cfg->atten, }{...}; ret = adc_oneshot_config_channel(s_adc1_handle, cfg->channel, &config); if (ret != ESP_OK) { return ret; }{...} //Calibrate the ADC #if SOC_ADC_CALIBRATION_V1_SUPPORTED adc_set_hw_calibration_code(cfg->adc_n, cfg->atten); #endif return ret; }{ ... } esp_err_t ulp_adc_deinit(void) { // No need to check for null-pointer and stuff, oneshot driver already does that return adc_oneshot_del_unit(s_adc1_handle); }{ ... }
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