Add gems for system and wifi

Author: carsonmcdonald

mrbgem.rake

@@ -0,0 +1,4 @@
+MRuby::Gem::Specification.new('mruby-esp32-system') do |spec|
+  spec.license = 'MIT'
+  spec.author  = 'Carson McDonald'
+end

mrblib/mrb_esp32_system.rb

@@ -0,0 +1,4 @@
+module ESP32
+  module System
+  end
+end

src/mrb_esp32_system.c

@@ -0,0 +1,39 @@
+#include <mruby.h>
+#include <mruby/value.h>
+
+#include <stdio.h>
+
+#include "esp_system.h"
+
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+static mrb_value
+mrb_esp32_system_delay(mrb_state *mrb, mrb_value self) {
+  mrb_int delay;
+
+  mrb_get_args(mrb, "i", &delay);
+
+  vTaskDelay(delay / portTICK_PERIOD_MS);
+
+  return self;
+}
+
+static mrb_value
+mrb_esp32_system_available_memory(mrb_state *mrb, mrb_value self) {
+  return mrb_fixnum_value(system_get_free_heap_size());
+}
+
+void
+mrb_mruby_esp32_system_gem_init(mrb_state* mrb) {
+  struct RClass *esp32_module = mrb_define_module(mrb, "ESP32");
+
+  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());
+}
+
+void
+mrb_mruby_esp32_system_gem_final(mrb_state* mrb) {
+}