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34 lines
1.2 KiB
C
34 lines
1.2 KiB
C
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/*
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* SPDX-FileCopyrightText: 2019-2021 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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#define COEFF_GROUP_NUM 4
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#define TERM_MAX 5
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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 coeffcients are recorded as Absolute Value
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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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* @note Above formula is rewritten from the original documentation, please note that the coefficients are re-ordered.
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* @note ADC1 and ADC2 use same coeffients
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*/
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extern const uint64_t adc1_error_coef_atten[COEFF_GROUP_NUM][TERM_MAX][2];
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extern const uint64_t adc2_error_coef_atten[COEFF_GROUP_NUM][TERM_MAX][2];
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/**
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* Term sign
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*/
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extern const int32_t adc1_error_sign[COEFF_GROUP_NUM][TERM_MAX];
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extern const int32_t adc2_error_sign[COEFF_GROUP_NUM][TERM_MAX];
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