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80 lines
3.0 KiB
C
80 lines
3.0 KiB
C
/*
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* SPDX-FileCopyrightText: 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 <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 2 // Currently C6 has two 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) + (K2 * X^2)
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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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{{487166399931449, 1e15}, {6436483033201, 1e16}, {30410131806, 1e16}}, //atten0
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{{8665498165817785, 1e16}, {15239070452946, 1e16}, {13818878844, 1e16}}, //atten1
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{{12277821756674387, 1e16}, {22275554717885, 1e16}, {5924302667, 1e16}}, //atten2
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{{3801417550380255, 1e16}, {6020352420772, 1e16}, {12442478488, 1e16}}, //atten3
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},
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/* Coefficients of calibration version 2 */
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{
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{{0, 0}, {0, 0}, {0, 0}}, //atten0
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{{0, 0}, {0, 0}, {0, 0}}, //atten1
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{{12217864764388775, 1e16}, {1954123107752, 1e16}, {6409679727, 1e16}}, //atten2
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{{3915910437042445, 1e16}, {31536470857564, 1e16}, {12493873014, 1e16}}, //atten3
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},
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};
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/**
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* Term sign
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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, 1}, //atten0
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{-1, 1, 1}, //atten1
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{-1, 1, 1}, //atten2
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{-1, -1, 1}, //atten3
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},
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/* Coefficient sign of calibration version 2 */
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{
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{ 0, 0, 0}, //atten0
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{ 0, 0, 0}, //atten1
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{-1, -1, 1}, //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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if (adc_calib_ver == ESP_EFUSE_ADC_CALIB_VER2 && config->atten < 2) {
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ctx->term_num = 0;
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ctx->coeff = NULL;
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ctx->sign = NULL;
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} else {
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ctx->term_num = 3;
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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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}
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