Add ESP32::System::chip_model method

Author: vickash

src/mrb_esp32_system.c

@@ -6,6 +6,7 @@
 #include "esp_system.h"
 #include "esp_sleep.h"
 #include "esp_timer.h"
+#include "esp_chip_info.h"
 
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
@@ -51,20 +52,44 @@ mrb_esp32_esp_timer_get_time(mrb_state *mrb, mrb_value self) {
   return mrb_float_value(mrb, esp_timer_get_time());
 }
 
+static mrb_value
+mrb_esp32_get_chip_model(mrb_state *mrb, mrb_value self) {
+  esp_chip_info_t info;
+  esp_chip_info(&info);
+  
+  // The integer in info.model is one of an enum. Values taken from here:
+  // https://github.com/espressif/esp-idf/blob/67552c31dac8cd94fb0d63192a538f4f984c5b6e/components/esp_hw_support/include/esp_chip_info.h#L22C7-L22C7
+  switch (info.model) {
+    // String format matches style used when installing ESP-IDF.
+    case   1: return mrb_str_new_cstr(mrb, "esp32");
+    case   2: return mrb_str_new_cstr(mrb, "esp32s2");
+    case   9: return mrb_str_new_cstr(mrb, "esp32s3");
+    case   5: return mrb_str_new_cstr(mrb, "esp32c3");
+    case  12: return mrb_str_new_cstr(mrb, "esp32c2");
+    case  13: return mrb_str_new_cstr(mrb, "esp32c6");
+    case  16: return mrb_str_new_cstr(mrb, "esp32h2");
+    case  18: return mrb_str_new_cstr(mrb, "esp32p4");
+    case 999: return mrb_str_new_cstr(mrb, "simulator");
+    default:  return mrb_str_new_cstr(mrb, "unknown");
+  }
+}
+
 void
 mrb_mruby_esp32_system_gem_init(mrb_state* mrb) {
+  // ESP32 Ruby module
   struct RClass *esp32_module = mrb_define_module(mrb, "ESP32");
 
+  // ESP32::System
   struct RClass *esp32_system_module = mrb_define_module_under(mrb, esp32_module, "System");
-
   mrb_define_module_function(mrb, esp32_system_module, "delay", mrb_esp32_system_delay, MRB_ARGS_REQ(1));
   mrb_define_module_function(mrb, esp32_system_module, "available_memory", mrb_esp32_system_available_memory, MRB_ARGS_NONE());
   mrb_define_module_function(mrb, esp32_system_module, "sdk_version", mrb_esp32_system_sdk_version, MRB_ARGS_NONE());
   mrb_define_module_function(mrb, esp32_system_module, "restart", mrb_esp32_system_restart, MRB_ARGS_NONE());
   mrb_define_module_function(mrb, esp32_system_module, "deep_sleep_for", mrb_esp32_system_deep_sleep_for, MRB_ARGS_REQ(1));
+  mrb_define_module_function(mrb, esp32_system_module, "chip_model", mrb_esp32_get_chip_model, MRB_ARGS_NONE());
 
+  // ESP32::Timer
   struct RClass *esp32_timer_module = mrb_define_module_under(mrb, esp32_module, "Timer");
-
   mrb_define_module_function(mrb, esp32_timer_module, "get_time", mrb_esp32_esp_timer_get_time, MRB_ARGS_NONE());
 }