Open terminal on FriendlyARM:
cd sys/class/gpio // go to gpio
echo 36 > export // enable pin 36 of i/o port
echo out > gpio36/direction // out for output. It makes pin 36 of I/O
port as output pin
echo 1 > gpio36/value // 1 for high, 0 for low
echo 36 > unexport //disable
Check by using DMM or by LED. Output voltage should 3.3V
2 comments:
Hi, my name is Anderson. I would like to know how access any GPIO in Java? I use the libfriendlyarm-hardware.so, but there are small quantity GPIO's (led's). I want to use, for example, the pushbutton. I want to use others I2C devices. I want to use others GPIO's (extension).
What kernel are you using? This does not exists in the FriendlyARM kernel.
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