GPIO via bash??

[redhawk]

Is it possible to read or write the pins on the GPIO using bash scripts or does it really have to be implemented using python or c++??

Richard S.

[pygmy_giant]

yes you can - I'll look it up and get back to you....

[joan]

Examples for various languages are given here http://elinux.org/Rpi_Low-level_peripherals

[redhawk]

Thanks, I just managed to toggle my GPIO pin via bash with the minimum amount of effort without the need of a compiler.

I guess if I wanted to implement this in Free Pascal all I need to do is treat the GPIO pins as if I was to read / write files or am I wrong??

Richard S.

[gordon@drogon.net]

Is it possible to read or write the pins on the GPIO using bash scripts or does it really have to be implemented using python or c++??

Richard S.

Absolutely!

first, get my wiringPi library:

Code: Select all

cd
git clone git://git.drogon.net/wiringPi
cd wiringPi
./build

then use the 'gpio' command:

Code: Select all

gpio mode 0 out
gpio write 0 1

etc.

use the -g flag if you want to use the BCM_GPIO numbers, otherwise it uses the wiringPi pin numbers.

0 -> 17
1- > 18
2 -> 21 or 27 if on a rev 2 board.

(stick to wiringPi numbers and you'll never need to change code)

Pinouts here: https://projects.drogon.net/raspberry-pi/wiringpi/pins/

Examples here:

Code: Select all

git clone git://git.drogon.net/ladder

and look at tuxx.sh

-Gordon

[tedhale]

Thanks, I just managed to toggle my GPIO pin via bash with the minimum amount of effort without the need of a compiler.

I guess if I wanted to implement this in Free Pascal all I need to do is treat the GPIO pins as if I was to read / write files or am I wrong??

Richard S.

Yes. That is all that the echo > bash command is doing.

Or, if you can call a C library from Free Pascal, then you could use Gordon's WiringPi API.

[Killerspec]

Hi

I am a complete newbie to Pi and programming but I do love electronics as a hobby. I am looking at taking my hobby to the next level and automate my projects. I am wondering if there is a guide out there to help a beginner like myself our a book that I can buy that deals with the programming side.

I have my Pi and I am using a Adafruit proto board to help me work cleaner.

Please help

Matthew