alex/esp-idf
1
0
Fork 0
mirror of https://github.com/espressif/esp-idf.git synced 2025-10-20 18:01:44 +00:00
Code Issues Packages Projects Releases Wiki Activity

temp_sensor: add calibration for esp32c3

Browse Source
This commit is contained in:
Cao Sen Miao
2021-01-13 21:23:08 +08:00
parent 0c77299c34
commit d92ac450a2
11 changed files with 63 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

28
components/driver/esp32c3/rtc_tempsensor.c
View File

@@ -15,6 +15,7 @@
#include <esp_types.h>
#include <stdlib.h>
#include <ctype.h>
#include <math.h>
#include "freertos/FreeRTOS.h"
#include "freertos/semphr.h"
#include "esp_log.h"
@@ -26,6 +27,7 @@
#include "driver/temp_sensor.h"
#include "regi2c_ctrl.h"
#include "esp32c3/rom/ets_sys.h"
#include "esp32c3/esp_efuse_rtc_calib.h"
static const char *TAG = "tsens";
@@ -58,6 +60,8 @@ static const tsens_dac_offset_t dac_offset[TSENS_DAC_MAX] = {
{TSENS_DAC_L4, 2, 10, -40, 20, 3},
};
static float s_deltaT = NAN; // unused number
esp_err_t temp_sensor_set_config(temp_sensor_config_t tsens)
{
REG_SET_BIT(SYSTEM_PERIP_CLK_EN1_REG, SYSTEM_TSENS_CLK_EN);
@@ -112,6 +116,28 @@ esp_err_t temp_sensor_read_raw(uint32_t *tsens_out)
return ESP_OK;
}
static void read_delta_t_from_efuse(void)
{
uint32_t version = esp_efuse_rtc_calib_get_ver();
if (version == 1) {
// fetch calibration value for temp sensor from eFuse
s_deltaT = esp_efuse_rtc_calib_get_cal_temp(version);
} else {
// no value to fetch, use 0.
s_deltaT = 0;
}
ESP_LOGD(TAG, "s_deltaT = %f", s_deltaT);
}
static float parse_temp_sensor_raw_value(uint32_t tsens_raw, const int dac_offset)
{
if (isnan(s_deltaT)) { //suggests that the value is not initialized
read_delta_t_from_efuse();
}
float result = (TSENS_ADC_FACTOR * (float)tsens_raw - TSENS_DAC_FACTOR * dac_offset - TSENS_SYS_OFFSET) - s_deltaT / 10.0;
return result;
}
esp_err_t temp_sensor_read_celsius(float *celsius)
{
TSENS_CHECK(celsius != NULL, ESP_ERR_INVALID_ARG);
@@ -123,7 +149,7 @@ esp_err_t temp_sensor_read_celsius(float *celsius)
printf("tsens_out %d\r\n", tsens_out);
TSENS_CHECK(ret == ESP_OK, ret);
const tsens_dac_offset_t *dac = &dac_offset[tsens.dac_offset];
*celsius = (TSENS_ADC_FACTOR * (float)tsens_out - TSENS_DAC_FACTOR * dac->offset - TSENS_SYS_OFFSET);
*celsius = parse_temp_sensor_raw_value(tsens_out, dac->offset);
if (*celsius < dac->range_min || *celsius > dac->range_max) {
ESP_LOGW(TAG, "Exceeding the temperature range!");
ret = ESP_ERR_INVALID_STATE;