esp-idf/components/driver/deprecated/rtc_temperature_legacy.c

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/*
* SPDX-FileCopyrightText: 2016-2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdlib.h>
#include <ctype.h>
#include <math.h>
#include "sdkconfig.h"
#include "esp_types.h"
#include "esp_log.h"
#include "esp_check.h"
#include "freertos/FreeRTOS.h"
#include "soc/rtc_cntl_reg.h"
#include "esp_private/regi2c_ctrl.h"
#include "soc/regi2c_saradc.h"
#include "esp_log.h"
#include "esp_efuse_rtc_calib.h"
#include "hal/temperature_sensor_ll.h"
#include "driver/temp_sensor_types_legacy.h"
#include "esp_private/periph_ctrl.h"
static const char *TAG = "tsens";
#define TSENS_ADC_FACTOR (0.4386)
#define TSENS_DAC_FACTOR (27.88)
#define TSENS_SYS_OFFSET (20.52)
typedef struct {
int index;
int offset;
int reg_val;
int range_min;
int range_max;
int error_max;
} tsens_dac_offset_t;
static const tsens_dac_offset_t dac_offset[TSENS_DAC_MAX] = {
/* DAC Offset reg_val min max error */
{TSENS_DAC_L0, -2, 5, 50, 125, 3},
{TSENS_DAC_L1, -1, 7, 20, 100, 2},
{TSENS_DAC_L2, 0, 15, -10, 80, 1},
{TSENS_DAC_L3, 1, 11, -30, 50, 2},
{TSENS_DAC_L4, 2, 10, -40, 20, 3},
};
typedef enum {
TSENS_HW_STATE_UNCONFIGURED,
TSENS_HW_STATE_CONFIGURED,
TSENS_HW_STATE_STARTED,
} tsens_hw_state_t;
static tsens_hw_state_t tsens_hw_state = TSENS_HW_STATE_UNCONFIGURED;
static float s_deltaT = NAN; // Unused number
esp_err_t temp_sensor_set_config(temp_sensor_config_t tsens)
{
esp_err_t err = ESP_OK;
if (tsens_hw_state == TSENS_HW_STATE_STARTED) {
ESP_LOGE(TAG, "Do not configure the temp sensor when it's running!");
err = ESP_ERR_INVALID_STATE;
}
temperature_sensor_ll_set_clk_div(tsens.clk_div);
temperature_sensor_ll_set_range(dac_offset[tsens.dac_offset].reg_val);
temperature_sensor_ll_enable(true);
ESP_LOGI(TAG, "Config range [%d°C ~ %d°C], error < %d°C",
dac_offset[tsens.dac_offset].range_min,
dac_offset[tsens.dac_offset].range_max,
dac_offset[tsens.dac_offset].error_max);
tsens_hw_state = TSENS_HW_STATE_CONFIGURED;
return err;
}
esp_err_t temp_sensor_get_config(temp_sensor_config_t *tsens)
{
ESP_RETURN_ON_FALSE(tsens != NULL, ESP_ERR_INVALID_ARG, TAG, "no tsens specified");
tsens->dac_offset = temperature_sensor_ll_get_offset();
for (int i = TSENS_DAC_L0; i < TSENS_DAC_MAX; i++) {
if ((int)tsens->dac_offset == dac_offset[i].reg_val) {
tsens->dac_offset = dac_offset[i].index;
break;
}
}
tsens->clk_div = temperature_sensor_ll_get_clk_div();
return ESP_OK;
}
esp_err_t temp_sensor_start(void)
{
esp_err_t err = ESP_OK;
if (tsens_hw_state != TSENS_HW_STATE_CONFIGURED) {
ESP_LOGE(TAG, "Is already running or not be configured");
err = ESP_ERR_INVALID_STATE;
}
regi2c_saradc_enable();
periph_module_enable(PERIPH_TEMPSENSOR_MODULE);
temperature_sensor_ll_enable(true);
temperature_sensor_ll_clk_enable(true);
temperature_sensor_ll_clk_sel(TEMPERATURE_SENSOR_CLK_SRC_DEFAULT);
tsens_hw_state = TSENS_HW_STATE_STARTED;
return err;
}
esp_err_t temp_sensor_stop(void)
{
regi2c_saradc_disable();
temperature_sensor_ll_enable(false);
tsens_hw_state = TSENS_HW_STATE_CONFIGURED;
return ESP_OK;
}
esp_err_t temp_sensor_read_raw(uint32_t *tsens_out)
{
ESP_RETURN_ON_FALSE(tsens_out != NULL, ESP_ERR_INVALID_ARG, TAG, "no tsens_out specified");
*tsens_out = temperature_sensor_ll_get_raw_value();
return ESP_OK;
}
static esp_err_t read_delta_t_from_efuse(void)
{
ESP_RETURN_ON_ERROR(esp_efuse_rtc_calib_get_tsens_val(&s_deltaT), TAG, "Calibration error");
ESP_LOGD(TAG, "s_deltaT = %f", s_deltaT);
return ESP_OK;
}
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 = (TEMPERATURE_SENSOR_LL_ADC_FACTOR * (float)tsens_raw - TEMPERATURE_SENSOR_LL_DAC_FACTOR * dac_offset - TEMPERATURE_SENSOR_LL_OFFSET_FACTOR) - s_deltaT / 10.0;
return result;
}
esp_err_t temp_sensor_read_celsius(float *celsius)
{
ESP_RETURN_ON_FALSE(celsius != NULL, ESP_ERR_INVALID_ARG, TAG, "celsius points to nothing");
if (tsens_hw_state != TSENS_HW_STATE_STARTED) {
ESP_LOGE(TAG, "Has not been started");
return ESP_ERR_INVALID_STATE;
}
temp_sensor_config_t tsens;
uint32_t tsens_out = 0;
temp_sensor_get_config(&tsens);
temp_sensor_read_raw(&tsens_out);
ESP_LOGV(TAG, "tsens_out %d", tsens_out);
const tsens_dac_offset_t *dac = &dac_offset[tsens.dac_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!");
return ESP_ERR_INVALID_STATE;
}
return ESP_OK;
}
/**
* @brief This function will be called during start up, to check that this legacy temp sensor driver is not running along with the new driver
*/
__attribute__((constructor))
static void check_legacy_temp_sensor_driver_conflict(void)
{
// This function was declared as weak here. temperature_sensor driver has one implementation.
// So if temperature_sensor driver is not linked in, then `temperature_sensor_install()` should be NULL at runtime.
extern __attribute__((weak)) esp_err_t temperature_sensor_install(const void *tsens_config, void **ret_tsens);
if ((void *)temperature_sensor_install != NULL) {
ESP_EARLY_LOGE(TAG, "CONFLICT! driver_ng is not allowed to be used with the legacy driver");
abort();
}
ESP_EARLY_LOGW(TAG, "legacy driver is deprecated, please migrate to `driver/temperature_sensor.h`");
}