kopia lustrzana https://github.com/espressif/esp-idf
169 wiersze
5.4 KiB
C
169 wiersze
5.4 KiB
C
/*
|
|
* 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 "esp_types.h"
|
|
#include "freertos/FreeRTOS.h"
|
|
#include "freertos/semphr.h"
|
|
#include "esp_log.h"
|
|
#include "esp_check.h"
|
|
#include "soc/rtc_cntl_reg.h"
|
|
#include "soc/rtc_io_reg.h"
|
|
#include "soc/rtc_io_struct.h"
|
|
#include "soc/sens_reg.h"
|
|
#include "soc/sens_struct.h"
|
|
#include "driver/temp_sensor.h"
|
|
#include "regi2c_ctrl.h"
|
|
#include "esp_log.h"
|
|
#include "esp_efuse_rtc_calib.h"
|
|
|
|
static const char *TAG = "tsens";
|
|
|
|
#define TSENS_XPD_WAIT_DEFAULT 0xFF /* Set wait cycle time(8MHz) from power up to reset enable. */
|
|
#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 set_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;
|
|
}
|
|
CLEAR_PERI_REG_MASK(ANA_CONFIG_REG, I2C_SAR_M);
|
|
SET_PERI_REG_MASK(ANA_CONFIG2_REG, ANA_SAR_CFG2_M);
|
|
REGI2C_WRITE_MASK(I2C_SAR_ADC, I2C_SARADC_TSENS_DAC, dac_offset[tsens.dac_offset].set_val);
|
|
SENS.sar_tctrl.tsens_clk_div = tsens.clk_div;
|
|
SENS.sar_tctrl.tsens_power_up_force = 1;
|
|
SENS.sar_tctrl.tsens_power_up = 1;
|
|
SENS.sar_tctrl2.tsens_xpd_force = 1;
|
|
ESP_LOGI(TAG, "Config temperature 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");
|
|
CLEAR_PERI_REG_MASK(ANA_CONFIG_REG, I2C_SAR_M);
|
|
SET_PERI_REG_MASK(ANA_CONFIG2_REG, ANA_SAR_CFG2_M);
|
|
tsens->dac_offset = REGI2C_READ_MASK(I2C_SAR_ADC, I2C_SARADC_TSENS_DAC);
|
|
for (int i = TSENS_DAC_L0; i < TSENS_DAC_MAX; i++) {
|
|
if ((int)tsens->dac_offset == dac_offset[i].set_val) {
|
|
tsens->dac_offset = dac_offset[i].index;
|
|
break;
|
|
}
|
|
}
|
|
tsens->clk_div = SENS.sar_tctrl.tsens_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, "Temperature sensor is already running or not be configured");
|
|
err = ESP_ERR_INVALID_STATE;
|
|
}
|
|
SENS.sar_tctrl.tsens_dump_out = 0;
|
|
SENS.sar_tctrl.tsens_power_up = 1;
|
|
SENS.sar_peri_clk_gate_conf.tsens_clk_en = 1;
|
|
tsens_hw_state = TSENS_HW_STATE_STARTED;
|
|
return err;
|
|
}
|
|
|
|
esp_err_t temp_sensor_stop(void)
|
|
{
|
|
SENS.sar_tctrl.tsens_power_up = 0;
|
|
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");
|
|
SENS.sar_tctrl.tsens_dump_out = 1;
|
|
while (!SENS.sar_tctrl.tsens_ready);
|
|
*tsens_out = SENS.sar_tctrl.tsens_out;
|
|
SENS.sar_tctrl.tsens_dump_out = 0;
|
|
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)
|
|
{
|
|
ESP_RETURN_ON_FALSE(celsius != NULL, ESP_ERR_INVALID_ARG, TAG, "celsius points to nothing");
|
|
temp_sensor_config_t tsens;
|
|
uint32_t tsens_out = 0;
|
|
esp_err_t ret = temp_sensor_get_config(&tsens);
|
|
if (ret == ESP_OK) {
|
|
ret = temp_sensor_read_raw(&tsens_out);
|
|
ESP_RETURN_ON_FALSE(ret == ESP_OK, ret, TAG, "failed to read raw data");
|
|
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!");
|
|
ret = ESP_ERR_INVALID_STATE;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|