GENERAL OBJETIVE:
Embedded Programming
- Read a microcontroller data sheet
- Program your board to do something, with as many different programming languages
and programming environments as possible
- Extra credit: experiment with other architectures
The objective of this assignment is to create a program to run tablet created in Week 06 (Electronics Design), in this case the tablet contains 3 devices: 1 input (button) and 2 output (LED's) and the program to create is: on a different lED each time the button is pressed.
Illustration 1 Tablet Designed in Week 6
To begin will be the development tool AVR Studio to create development projects for micro-controllers AVR
Figure 2 Interface Home AVR Studio (New Project)
Once you choose to create a new project, you must select the language that is to be programmed, as shown in Figure 2. Posterior is to choose the device to be programmed.
Figure 3 Selecting Device to Programming
The code used in assembly language is:
;
; EmbedProg.asm
;
; Week06_Embedded_Programming.asm
;
; Created: 06/04/2016 09:09:18 a. m.
; Author : Iván Hernández Sánchez
;
.include "tn44def.inc"
.def boton = r16
.def led1 = r17
.def led2 = r18
.def temp = r19
.def aux = r20
.org 0x0000 rjmp RESET
; Replace with your application code
RESET:
LDI aux, 0b01111111
OUT DDRA, aux
LECTURA:
IN boton, PINA
MOV temp, boton
ANDI temp, 0b10000000
CPI boton, 0
BRNE LEDROJO
RJMP LEDVERDE
LEDROJO:
LDI led1, 0b00001000
OUT PORTA, led1
RJMP LECTURA
LEDVERDE:
LDI led2, 0b00000100
OUT PORTA, led2
RJMP LECTURA
Figure 4 Assembly Language in AVR Studio
With the help of tutorial Anna Kazzihunas (See tutorial) connects the Attiny44 with the FTDI cable to program using the Arduino IDE; however, the ID Arduino 1.0.5 was used and the code used is as follows:
int ledverde = 2, ledrojo = 3;
int boton = 7;
void setup()
{
pinMode(ledrojo, OUTPUT);
pinMode(ledverde, OUTPUT);
pinMode(boton, INPUT);
}
void loop()
{
int aux;
aux=digitalRead(boton);
if (aux==HIGH)
{
digitalWrite(ledrojo, HIGH);
digitalWrite(ledverde, LOW);
}
else
{
digitalWrite(ledverde, HIGH);
digitalWrite(ledrojo, LOW);
}
}
Figure 5 Language Arduino ID Arduino 1.0.5 with Library ATtiny
download codes
The latest drivers for the FTDI cable is here (click)
Once the program tablet loaded is tested, it is observed that is not working properly; however, doing a simulation of it it can be seen that the code does what it should do. The simulation was performed in Proteus 8.1
Download file simulation (here)
Figure 6 Simulation Proteus 8