Raspberry Pi GPIO

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  • Posted by Jerome Jan 06, 2013
  • 1454 views

Here is a snippet of Eu code that controls the brightness of a led (light-emitting diode) connected to the Raspberry Pi! It is based on the Wiring Pi library which is written in C. 

without warning 
include std/os.e 
 
-- Setup GPIO pins 
integer pinMode = 0 
if ( setupGPIO(pinMode) ) < 0 then 
        abort(1) 
end if 
 
-- Set pin 1 to PWM 
constant PWM = 2 
pinMode(1, PWM) 
 
-- Set the initial brightness of the LED 
integer bright = 0, inc = 10 
pwmWrite(1,bright) 
 
-- While loop that changes LED brightness 
while( get_key() < 0 ) do 
        pwmWrite(1, bright) 
        bright += inc 
        if bright >= 1020 or bright <= 0 then 
                inc = -inc 
        end if 
        sleep(0.01) 
end while 
 
-- Turn LED off 
pwmWrite(1,0)

Would something along these lines be useful to add support for?

Thanks,
Ira

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