mirror of
https://github.com/espressif/esp-idf
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61 lines
2.2 KiB
C
61 lines
2.2 KiB
C
/*
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* SPDX-FileCopyrightText: 2024 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 <stdint.h>
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#include "esp_efuse_rtc_calib.h"
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#include "../curve_fitting_coefficients.h"
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#define COEFF_VERSION_NUM 1 // Currently C5 has one versions of curve calibration schemes
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#define COEFF_GROUP_NUM 4
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#define TERM_MAX 3
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/**
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* @note Error Calculation
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* Coefficients for calculating the reading voltage error.
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* Four sets of coefficients for atten0 ~ atten3 respectively.
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*
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* For each item, first element is the Coefficient, second element is the Multiple. (Coefficient / Multiple) is the real coefficient.
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*
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* @note {0,0} stands for unused item
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* @note In case of the overflow, these coefficients are recorded as Absolute Value
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* @note For atten0 ~ 3, error = (K0 * X^0) + (K1 * X^1)
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* @note Above formula is rewritten from the original documentation, please note that the coefficients are re-ordered.
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*/
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const static uint64_t adc1_error_coef_atten[COEFF_VERSION_NUM][COEFF_GROUP_NUM][TERM_MAX][2] = {
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/* Coefficients of calibration version 1 */
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{
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{{2941017829027464, 1e16}, {7368674918527, 1e16}, {0, 0}}, //atten0
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{{3224276125615327, 1e16}, {5325658467636, 1e16}, {0, 0}}, //atten1
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{{3307554632960901, 1e16}, {409244304226, 1e15}, {0, 0}}, //atten2
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{{1463642578413965, 1e15}, {3349642363147, 1e15}, {11676836451, 1e16}}, //atten3
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},
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};
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/**
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* Term sign ADC1
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*/
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const static int32_t adc1_error_sign[COEFF_VERSION_NUM][COEFF_GROUP_NUM][TERM_MAX] = {
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/* Coefficient sign of calibration version 1 */
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{
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{1, -1, 0}, //atten0
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{1, -1, 0}, //atten1
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{1, -1, 0}, //atten2
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{1, -1, 1}, //atten3
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},
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};
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void curve_fitting_get_second_step_coeff(const adc_cali_curve_fitting_config_t *config, cali_chars_second_step_t *ctx)
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{
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uint32_t adc_calib_ver = esp_efuse_rtc_calib_get_ver();
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assert((adc_calib_ver >= ESP_EFUSE_ADC_CALIB_VER_MIN) &&
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(adc_calib_ver <= ESP_EFUSE_ADC_CALIB_VER_MAX));
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ctx->term_num = 2;
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ctx->coeff = adc1_error_coef_atten[VER2IDX(adc_calib_ver)][config->atten];
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ctx->sign = adc1_error_sign[VER2IDX(adc_calib_ver)][config->atten];
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}
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