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50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/*
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* SPDX-FileCopyrightText: 2020-2022 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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#pragma once
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#include <stdint.h>
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#include "sdkconfig.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32S3
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#define ESP_ADC_CAL_CURVE_FITTING_SUPPORTED 1
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#define COEFF_GROUP_NUM 4
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#define TERM_MAX 5
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#endif
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#if ESP_ADC_CAL_CURVE_FITTING_SUPPORTED
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/**
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* Calculation parameters used for curve fitting calibration algorithm error
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*
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* @note For atten0 ~ 2, error = (K0 * X^0) + (K1 * X^1) + (K2 * X^2); For atten3, error = (K0 * X^0) + (K1 * X^1) + (K2 * X^2) + (K3 * X^3) + (K4 * X^4);
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* Where X is the `v_cali_input`.
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*/
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typedef struct {
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uint64_t v_cali_input; //Input to calculate the error
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uint8_t term_num; //Term number of the algorithm formula
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const uint64_t (*coeff)[COEFF_GROUP_NUM][TERM_MAX][2]; //Coeff of each term. See `adc_error_coef_atten` for details (and the magic number 2)
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const int32_t (*sign)[COEFF_GROUP_NUM][TERM_MAX]; //Sign of each term
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} esp_adc_error_calc_param_t;
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/**
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* Calculate the curve fitting error
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*
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* @param param see `esp_adc_error_calc_param_t`
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* @param atten ADC attenuation
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*/
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int32_t esp_adc_cal_get_reading_error(const esp_adc_error_calc_param_t *param, uint8_t atten);
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#endif //#if ESP_ADC_CAL_CURVE_FITTING_SUPPORTED
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#ifdef __cplusplus
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}
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#endif
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