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driver/adc: support for esp32s2 adc calibration scheme V2

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notice that the o_code is now pulled from efuse instead of automatically calibrated. This may influence other parts of the system.

Closes https://github.com/espressif/esp-idf/issues/5455
This commit is contained in:
Wu Bo Wen
2020-12-03 20:08:59 +08:00
committed by Michael (XIAO Xufeng)
parent 820e092a8d
commit 5cc329b9d0
12 changed files with 557 additions and 264 deletions
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components/driver/esp32s2/rtc_tempsensor.c
+27 -1
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@@ -25,6 +25,8 @@
#include "soc/sens_struct.h"
#include "driver/temp_sensor.h"
#include "regi2c_ctrl.h"
#include "esp_log.h"
#include "esp32s2/esp_efuse_rtc_table.h"
static const char *TAG = "tsens";
@@ -59,6 +61,8 @@ static const tsens_dac_offset_t dac_offset[TSENS_DAC_MAX] = {
static SemaphoreHandle_t rtc_tsens_mux = NULL;
static float deltaT = 1000; // greater than range
esp_err_t temp_sensor_set_config(temp_sensor_config_t tsens)
{
CLEAR_PERI_REG_MASK(RTC_CNTL_ANA_CONF_REG, RTC_CNTL_SAR_I2C_FORCE_PD_M);
@@ -133,6 +137,28 @@ 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_table_read_calib_version();
if (version == 1 || version == 2) {
// fetch calibration value for temp sensor from eFuse
deltaT = esp_efuse_rtc_table_get_parsed_efuse_value(RTCCALIB_IDX_TMPSENSOR, false) / 10.0;
} else {
// no value to fetch, use 0.
deltaT = 0;
}
ESP_LOGD(TAG, "deltaT = %f\n", deltaT);
}
static float parse_temp_sensor_raw_value(uint32_t tsens_raw, const tsens_dac_offset_t *dac)
{
if (deltaT > 512) { //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) - deltaT;
return result;
}
esp_err_t temp_sensor_read_celsius(float *celsius)
{
TSENS_CHECK(celsius != NULL, ESP_ERR_INVALID_ARG);
@@ -143,7 +169,7 @@ esp_err_t temp_sensor_read_celsius(float *celsius)
ret = temp_sensor_read_raw(&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);
if (*celsius < dac->range_min || *celsius > dac->range_max) {
ESP_LOGW(TAG, "Exceeding the temperature range!");
ret = ESP_ERR_INVALID_STATE;