ESP.getChipModel() and ESP.getChipCores() (espressif#3847)

* ESP.getChipModel() returns model of the chip

* ESP.getChipCores() returns the core count.

* Example gives chip model, revision and core count.

* Read efuse for chipmodel

Co-authored-by: Martijn Scheepers <ms@SDNengineering.nl>

Author: PA4WD

Diff for: cores/esp32/Esp.cpp

@@ -218,6 +218,33 @@ uint8_t EspClass::getChipRevision(void)
     return chip_info.revision;
 }
 
+const char * EspClass::getChipModel(void)
+{
+    uint32_t chip_ver = REG_GET_FIELD(EFUSE_BLK0_RDATA3_REG, EFUSE_RD_CHIP_VER_PKG);
+    uint32_t pkg_ver = chip_ver & 0x7;
+    switch (pkg_ver) {
+        case EFUSE_RD_CHIP_VER_PKG_ESP32D0WDQ6 :
+            return "ESP32-D0WDQ6";
+        case EFUSE_RD_CHIP_VER_PKG_ESP32D0WDQ5 :
+            return "ESP32-D0WDQ5";
+        case EFUSE_RD_CHIP_VER_PKG_ESP32D2WDQ5 :
+            return "ESP32-D2WDQ5";
+        case EFUSE_RD_CHIP_VER_PKG_ESP32PICOD2 :
+            return "ESP32-PICO-D2";
+        case EFUSE_RD_CHIP_VER_PKG_ESP32PICOD4 :
+            return "ESP32-PICO-D4";
+        default:
+            return "Unknown";
+    }
+}
+
+uint8_t EspClass::getChipCores(void)
+{
+    esp_chip_info_t chip_info;
+    esp_chip_info(&chip_info);
+    return chip_info.cores;
+}
+
 const char * EspClass::getSdkVersion(void)
 {
     return esp_get_idf_version();

Diff for: cores/esp32/Esp.h

@@ -75,6 +75,8 @@ class EspClass
     uint32_t getMaxAllocPsram();
 
     uint8_t getChipRevision();
+    const char * getChipModel();
+    uint8_t getChipCores();
     uint32_t getCpuFreqMHz(){ return getCpuFrequencyMhz(); }
     inline uint32_t getCycleCount() __attribute__((always_inline));
     const char * getSdkVersion();

Diff for: libraries/ESP32/examples/ChipID/GetChipID/GetChipID.ino

@@ -9,6 +9,9 @@ void loop() {
 	Serial.printf("ESP32 Chip ID = %04X",(uint16_t)(chipid>>32));//print High 2 bytes
 	Serial.printf("%08X\n",(uint32_t)chipid);//print Low 4bytes.
 
+	Serial.printf("ESP32 Chip model = %s Rev %d\n", ESP.getChipModel(), ESP.getChipRevision());
+	Serial.printf("This chip has %d cores\n", ESP.getChipCores());
+
 	delay(3000);
 
 }