9. Embedded programming

This week’s group assignments write programs in multiple development environments, boards, and languages.

Things to do

Use different boards to operate the circuit consisting of LEDs.

C

used FabISP.
wrote the following code with C.

#include <avr/io.h>
#include <util/delay.h>

int main(){
    DDRA = 0b10000000; // portA setting
    DDRB = 0b00001011; // protB setting

    while(1){
        if(bit_is_clear(PINB,PINB2)){
            PORTA = 0b10000000;
        }else{
            PORTA = 0b00000000;
        }
    }    
}

Arduino

designed the following circuit.

wrote the following code with C++.

const int buttonPin = 2;     // the number of the pushbutton pin
const int ledPin =  13;      // the number of the LED pin

int buttonState = 0;         // variable for reading the pushbutton status

void setup() {
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT);
}

void loop() {
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);

  // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
  if (buttonState == HIGH) {
    // turn LED on:
    digitalWrite(ledPin, HIGH);
  } else {
    // turn LED off:
    digitalWrite(ledPin, LOW);
  }
}

Raspberry Pi

wrote the following code with python.

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
GPIO.setup(2,GPIO.OUT)
for x in xrange(5):
    GPIO.output(2,True)
    time.sleep(x)
    GPIO.output(2,False)
    time.sleep(x)
GPIO.cleanup()

micro:bit

Impression

Oops,The image was not taken. It might be because the code to write was too easy, but I did not feel the difference in the degree of difficulty in writing the program.