temp_sensor: add calibration for esp32c3

examples/peripherals/temp_sensor/CMakeLists.txt

@@ -0,0 +1,6 @@
+# The following lines of boilerplate have to be in your project's CMakeLists
+# in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(temp_sensor)

examples/peripherals/temp_sensor/README.md

@@ -0,0 +1,30 @@
+| Supported Targets | ESP32-S2 |
+| ----------------- | -------- |
+
+# ESP32-S2 Temperature Sensor Example
+
+The ESP32-S2 has a built-in temperature sensor. The temperature sensor module contains an 8-bit Sigma-Delta ADC and a temperature offset DAC.    
+
+The conversion relationship is the first two columns of the table below. Among them, `offset = 0`(default) is the main measurement option, and other values are extended measurement options.  
+
+| DAC level | offset | measure range(℃) | measure error(℃) |
+| :-------: | :----: | :--------------: | :--------------: |
+|     0     |   -2   |     50 ~ 125     |       < 3        |
+|     1     |   -1   |     20 ~ 100     |       < 2        |
+|     2     |   0    |     -10 ~ 80     |       < 1        |
+|     3     |   1    |     -30 ~ 50     |       < 2        |
+|     4     |   2    |     -40 ~ 20     |       < 3        |
+
+* Log output :
+
+```
+I (243) TempSensor: Initializing Temperature sensor
+I (243) TempSensor: default dac 2, clk_div 6
+I (243) TempSensor: Config temperature range [-10°C ~ 80°C], error < 1°C
+I (253) TempSensor: Temperature sensor started
+I (1253) TempSensor: Temperature out celsius 27.287399°C
+I (2253) TempSensor: Temperature out celsius 26.848801°C
+I (3253) TempSensor: Temperature out celsius 26.848801°C
+I (4253) TempSensor: Temperature out celsius 27.287399°C
+I (5253) TempSensor: Temperature out celsius 27.287399°C
+```

examples/peripherals/temp_sensor/main/CMakeLists.txt

@@ -0,0 +1,2 @@
+idf_component_register(SRCS "temp_sensor_main.c"
+                    INCLUDE_DIRS ".")

examples/peripherals/temp_sensor/main/component.mk

@@ -0,0 +1,4 @@
+#
+# "main" pseudo-component makefile.
+#
+# (Uses default behaviour of compiling all source files in directory, adding 'include' to include path.)

examples/peripherals/temp_sensor/main/temp_sensor_main.c

@@ -0,0 +1,54 @@
+/* Temperature Sensor Example
+
+   This example code is in the Public Domain (or CC0 licensed, at your option.)
+
+   Unless required by applicable law or agreed to in writing, this
+   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+   CONDITIONS OF ANY KIND, either express or implied.
+*/
+#include <stdio.h>
+#include <stdlib.h>
+#include "esp_log.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+/* Note: ESP32 don't support temperature sensor */
+
+#if CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32C3
+#include "driver/temp_sensor.h"
+
+static const char *TAG = "TempSensor";
+
+void tempsensor_example(void *arg)
+{
+    // Initialize touch pad peripheral, it will start a timer to run a filter
+    ESP_LOGI(TAG, "Initializing Temperature sensor");
+    float tsens_out;
+    temp_sensor_config_t temp_sensor = TSENS_CONFIG_DEFAULT();
+    temp_sensor_get_config(&temp_sensor);
+    ESP_LOGI(TAG, "default dac %d, clk_div %d", temp_sensor.dac_offset, temp_sensor.clk_div);
+    temp_sensor.dac_offset = TSENS_DAC_DEFAULT; // DEFAULT: range:-10℃ ~  80℃, error < 1℃.
+    temp_sensor_set_config(temp_sensor);
+    temp_sensor_start();
+    ESP_LOGI(TAG, "Temperature sensor started");
+    while (1) {
+        vTaskDelay(1000 / portTICK_RATE_MS);
+        temp_sensor_read_celsius(&tsens_out);
+        ESP_LOGI(TAG, "Temperature out celsius %f°C", tsens_out);
+    }
+    vTaskDelete(NULL);
+}
+
+void app_main(void)
+{
+    xTaskCreate(tempsensor_example, "temp", 2048, NULL, 5, NULL);
+}
+
+#elif CONFIG_IDF_TARGET_ESP32
+
+void app_main(void)
+{
+    printf("ESP32 don't support temperature sensor\n");
+}
+
+#endif