03-IoT-workshop-mrubyc-esp32-hello_world.md

clone template

git clone https://github.com/hasumikin/mrubyc-template-esp32.git 03
cd 03

edit source

• create mrblib/loops/master.rb
• create mrblib/models/greeter.rb
• edit main/main.c (you can replace whole of the file with code below)

build, flash and run

make
make flash
make monitor

greeter.rb

# mrblib/models/greeter.rb

class Greeter
  def greet
    puts "Hello World!"
  end
end

main.c

/* main/main.c */

#include "mrubyc.h"

#include "models/greeter.h"
#include "loops/master.h"

#define MEMORY_SIZE (1024*40)

static uint8_t memory_pool[MEMORY_SIZE];

void app_main(void) {
  mrbc_init(memory_pool, MEMORY_SIZE);

  mrbc_create_task( greeter, 0 );
  mrbc_create_task( master, 0 );
  mrbc_run();
}

master.rb

# mrblib/loops/master.rb

greeter = Greeter.new

while true
  greeter.greet
  sleep 1
end