Merge branch 'feature/get_chip_ver' into 'master'

add API to get chip info

This change adds an API to get chip info, such as chip model, enabled capabilities, size of embedded flash, silicon revision.

Hello_world example is modified to print out the information about the chip. The example is also simplified by moving all code into the main task.

Ref TW12031.

See merge request !549

components/esp32/include/esp_system.h

@@ -221,6 +221,38 @@ const char* system_get_sdk_version(void)  __attribute__ ((deprecated));
  */
 const char* esp_get_idf_version(void);
 
+
+/**
+ * @brief Chip models
+ */
+typedef enum {
+    CHIP_ESP32 = 1, //!< ESP32
+} esp_chip_model_t;
+
+/**
+ * Chip feature flags, used in esp_chip_info_t
+ */
+#define CHIP_FEATURE_EMB_FLASH      BIT(0)
+#define CHIP_FEATURE_WIFI_BGN       BIT(1)
+#define CHIP_FEATURE_BLE            BIT(4)
+#define CHIP_FEATURE_BT             BIT(5)
+
+/**
+ * @brief The structure represents information about the chip
+ */
+typedef struct {
+    esp_chip_model_t model;  //!< chip model, one of esp_chip_model_t
+    uint32_t features;       //!< bit mask of CHIP_FEATURE_x feature flags
+    uint8_t cores;           //!< number of CPU cores
+    uint8_t revision;        //!< chip revision number
+} esp_chip_info_t;
+
+/**
+ * @brief Fill an esp_chip_info_t structure with information about the chip
+ * @param[out] out_info structure to be filled
+ */
+void esp_chip_info(esp_chip_info_t* out_info);
+
 #ifdef __cplusplus
 }
 #endif