mirror of
https://github.com/espressif/esp-idf.git
synced 2024-09-20 00:36:01 -04:00
37 lines
1.9 KiB
C
37 lines
1.9 KiB
C
/*
|
|
* SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
|
|
/**
|
|
* @note Error Calculation
|
|
* Coefficients for calculating the reading voltage error.
|
|
* Four sets of coefficients for atten0 ~ atten3 respectively.
|
|
*
|
|
* For each item, first element is the Coefficient, second element is the Multiple. (Coefficient / Multiple) is the real coefficient.
|
|
*
|
|
* @note {0,0} stands for unused item
|
|
* @note In case of the overflow, these coefficients are recorded as Absolute Value
|
|
* @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);
|
|
* @note Above formula is rewritten from the original documentation, please note that the coefficients are re-ordered.
|
|
*/
|
|
const uint64_t adc1_error_coef_atten[4][5][2] = {
|
|
{{487166399931449, 1e16}, {6436483033201, 1e16}, {30410131806, 1e16}, {0, 0}, {0, 0}}, //atten0
|
|
{{8665498165817785, 1e16}, {15239070452946, 1e16}, {13818878844, 1e16}, {0, 0}, {0, 0}}, //atten1
|
|
{{12277821756674387, 1e16}, {22275554717885, 1e16}, {5924302667, 1e16}, {0, 0}, {0, 0}}, //atten2
|
|
{{3801417550380255, 1e16}, {6020352420772, 1e16}, {12442478488, 1e16}, {0, 0}, {0, 0}} //atten3
|
|
};
|
|
|
|
/**
|
|
* Term sign
|
|
*/
|
|
const int32_t adc1_error_sign[4][5] = {
|
|
{-1, 1, 1, 0, 0}, //atten0
|
|
{-1, 1, 1, 0, 0}, //atten1
|
|
{-1, 1, 1, 0, 0}, //atten2
|
|
{-1, -1, 1, 0, 0} //atten3
|
|
};
|