04-IoT-workshop-mrubyc-esp32-led.md

wire a breadboard

clone template

git clone https://github.com/hasumikin/mrubyc-template-esp32.git 04
cd 04

edit source

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

build, flash and run

make
make flash
make monitor

blinking_led_breadboard.png

led.rb

# mrblib/models/led.rb

class Led
  def initialize(pin)
    @pin = pin
    gpio_init_output(@pin)
    turn_off
  end

  def turn_on
    gpio_set_level(@pin, 1)
    puts "turned on"
  end

  def turn_off
    gpio_set_level(@pin, 0)
    puts "turned off"
  end
end

main.c

/* main/main.c */

#include "driver/gpio.h"

#include "mrubyc.h"

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

#define MEMORY_SIZE (1024*40)

static uint8_t memory_pool[MEMORY_SIZE];

static void c_gpio_init_output(mrb_vm *vm, mrb_value *v, int argc) {
  int pin = GET_INT_ARG(1);
  console_printf("init pin %d\n", pin);
  gpio_set_direction(pin, GPIO_MODE_OUTPUT);
}

static void c_gpio_set_level(mrb_vm *vm, mrb_value *v, int argc){
  int pin = GET_INT_ARG(1);
  int level = GET_INT_ARG(2);
  gpio_set_level(pin, level);
}

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

  mrbc_define_method(0, mrbc_class_object, "gpio_init_output", c_gpio_init_output);
  mrbc_define_method(0, mrbc_class_object, "gpio_set_level", c_gpio_set_level);

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

master.rb

# mrblib/loops/master.rb

led = Led.new(19)

while true
  led.turn_on
  sleep 1
  led.turn_off
  sleep 1
end