Embedded Programming
this week assignement is:
- Read a microcontroller data sheet.
- Program your board to do something, with as many different programming languages and programming environments as possible.
Reading a datasheet.
I decide this week to work on the ATtiny85 Datasheet.
the first thing i found was that a datasheet for this type of component are really big. but you have Every info you should know about it inside this.
we can cut the datasheet in Three big part, The features pages, the summary, and the details.
1) Feature
![](images/w9/8.png)
The ATTINY85 is rated as:
Voltage - Supply (Vcc): 2.7 V ~ 5.5 V
OR
8K Bytes of In-System Programmable Program Memory Flash
The summary
![](images/w9/9.png)
if you don't CTRL+F make you able to rechearch a specfic word everywhere in the documentation.
The details.
![](images/w9/7.png)
the timing sent to the program is on sck,
Then the timing of sending data should be sinchronise to the end of the Most Significant Byte -MSB-
PINOUT
One of the most useful thing in a datasheet is the Pinout of the component.with that, you can know really easly wich pin of the component you should connect one function.
For exemple, when you are making a pcb, you know with it, the First left pin is dedicated to VCC, and the first on the right is Gnd
![](images/w9/10.png)
Program your board.
This week i programmed my board two ways. With a FabIsp, and an Arduino Uno.
WIth a FabISP
Few Weeks ago we made a FabISP![](images/w9/2.png)
- Reset to RESET
- VCC to VCC
- Mosi to Mosi
- Miso to Miso
- GND To GND
- SCK to SCK
![¨PHOTO DU FABISP & echo helloboard l'un a coter de l'autre](images/w9/1.png)
![¨PHOTO DU FABISP & echo helloboard l'un a coter de l'autre](images/w9/3.png)
![¨PHOTO DU FABISP & echo helloboard l'un a coter de l'autre](images/w9/4.png)
![¨PHOTO DU FABISP & echo helloboard l'un a coter de l'autre](images/w9/5.png)
![¨PHOTO DU FABISP & echo helloboard l'un a coter de l'autre](images/w9/-6.png)
With an arduino Uno
Programming a board with an arduino is pretty similar to the way to do it with the FabISPfor that i'm using an arduino as an ISP. it's working great.
- Pin13(arduino) to SCK
- pin12 (arduino) to MISO
- Pin11(arduino) to MOSI
- Pin 10(arduino) to RESET
- 5V to VCC
- Gnd TO Gnd
GO on file> example>arduinoISP
Upload the file into your arduino. then choose the Attiny 44 into the board manager, choose the internal clock to 8Mhz, change the programmer to Arduino as isp.
![](images/W11/arduino.png)
![](images/W11/blink.jpg)
Time to code
now that we now our board is working is time to code the ECHO HELLO Board FOR that, i know that i connected the pinout A3 on the BUTTON & the led on A7![](images/w9/11.png)
int boutonETAT = 0; //THIS WILL SAVE THE STATE OF THE BUTTON
const int bouton = A3; // THIS IS THE PINOUT OF THE BUTTON
const int led = A7; // THIS IS THE PINOUT OF THE LED
void setup() {
pinMode(led, OUTPUT);//THE LED WILL RECEIVE A VOLTAGE FROM THE PINOUT SO IT'S AN OUTPUT
pinMode(bouton, INPUT);//the ATTINY WILL READ THE STATE OF THE BUTTON SO IT'S AN INPUT
}
void loop() {
boutonETAT = digitalRead(bouton);// THIS WILL READ THE STATE OF THE BUTTON AN SAVE IT INTO THE VARIABLE BOUTON ETAT
if (boutonETAT == HIGH) { // THIS WILL VERIFY IF THE BUTTON IS PRESSED?
digitalWrite(led, HIGH); //THE LED WILL START TO GLOW
}
else {// IN ANY OTHER CASE.
digitalWrite(led, LOW);// THE LED WILL STAY OFF
}
}
--
file of the week.
here you'll find the file of the week
For downloading
right click and save as
- datasheet file (pdf)
- code (BLINK) file (RIGHT CLICK -SAVE AS-)
- code (bouton) file (RIGHT CLICK -SAVE AS-)
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