alex/esp-idf
1
0
Fork 0
mirror of https://github.com/espressif/esp-idf.git synced 2025-09-24 17:27:21 +00:00
Code Issues Packages Projects Releases Wiki Activity

feat(adc_cali): Add ADC calibration support for ESP32H2

Browse Source
This commit is contained in:
gaoxu
2023-10-30 12:11:17 +08:00
parent 100ba9f375
commit 0ea0b39725
11 changed files with 251 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

61
components/esp_adc/esp32h2/curve_fitting_coefficients.c Normal file
View File

@@ -0,0 +1,61 @@
/*
* SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdio.h>
#include <stdint.h>
#include "esp_efuse_rtc_calib.h"
#include "../curve_fitting_coefficients.h"
#define COEFF_VERSION_NUM 1 // Currently H2 has one versions of curve calibration schemes
#define COEFF_GROUP_NUM 4
#define TERM_MAX 3
/**
* @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)
* @note For atten3, error = (K0 * X^0) + (K1 * X^1) + (K2 * X^2)
* @note Above formula is rewritten from the original documentation, please note that the coefficients are re-ordered.
*/
const static uint64_t adc1_error_coef_atten[COEFF_VERSION_NUM][COEFF_GROUP_NUM][TERM_MAX][2] = {
/* Coefficients of calibration version 1 */
{
{{5081991760658888, 1e16}, {7858995318513, 1e19}, {0, 1}}, //atten0
{{8359230818901277, 1e16}, {9025419089179, 1e19}, {0, 1}}, //atten1
{{1165668771581976, 1e15}, {8294679249061, 1e19}, {0, 1}}, //atten2
{{3637329628677273, 1e16}, {19607259738935, 1e18}, {7871689227, 1e16}}, //atten3
},
};
/**
* Term sign
*/
const static int32_t adc1_error_sign[COEFF_VERSION_NUM][COEFF_GROUP_NUM][TERM_MAX] = {
/* Coefficient sign of calibration version 1 */
{
{-1, 1, 1}, //atten0
{-1, 1, 1}, //atten1
{-1, 1, 1}, //atten2
{-1, -1, 1}, //atten3
},
};
void curve_fitting_get_second_step_coeff(const adc_cali_curve_fitting_config_t *config, cali_chars_second_step_t *ctx)
{
uint32_t adc_calib_ver = esp_efuse_rtc_calib_get_ver();
assert((adc_calib_ver >= ESP_EFUSE_ADC_CALIB_VER_MIN) &&
(adc_calib_ver <= ESP_EFUSE_ADC_CALIB_VER_MAX));
ctx->term_num = 3;
ctx->coeff = adc1_error_coef_atten[VER2IDX(adc_calib_ver)][config->atten];
ctx->sign = adc1_error_sign[VER2IDX(adc_calib_ver)][config->atten];
}