Rock/GPIO

2014-09-25T21:56:54Z

Jdarling: Added JavaScript (Node.js)

Checkout the [[rock/extension_header]] page for gpios on the extension header.

Below is programming in different languages to bit flipping the GPIO on RR.

== C ==
<syntaxhighlight lang="c" enclose="div">

#include <stdio.h>

int main()
{
FILE *fp = fopen("/sys/class/gpio/export", "w");
if( !fp )
{
printf("error open export file");
return 1;
}
fprintf(fp, "%d", 172);
fclose(fp);

fp = fopen("/sys/class/gpio/gpio175/direction", "w");

if( !fp )
{
printf("error open export file");
return 1;
}
fprintf(fp, "%s", "out");
fclose(fp);

fp = fopen("/sys/class/gpio/gpio175/value", "w");

if( !fp )
{
printf("error open export file");
return 1;
}
fprintf(fp, "%d", 1);

}

</syntaxhighlight>

== Python ==

Python library.
sudo apt-get install gcc python-dev

<syntaxhighlight lang="python" enclose="div">

import time

def initpin(pinnum, mode):
'''
pinnum: pin number, eg. 172, 175 etc.
mode: pin mode, valid values: in or out
'''
with open('/sys/class/gpio/export', 'w') as f:
f.write(str(pinnum))

with open('/sys/class/gpio/gpio' + str(pinnum) + '/direction', 'w') as f:
f.write(str(mode))

def setpin(pinnum, value):

with open('/sys/class/gpio/gpio' + str(pinnum) + '/value', 'w') as f:
f.write(str(value))

if __name__ == '__main__':
initpin(172, 'out')
while True:
setpin(172, 0)
time.sleep(1)
setpin(172, 1)
time.sleep(1)
</syntaxhighlight>

== Shell ==
<syntaxhighlight lang="bash" enclose="div">

#!/bin/sh

# enable the gpio 172 -> green led
echo 172 > /sys/class/gpio/export

# set the direction to output
echo "out" > /sys/class/gpio/gpio172/direction
while true;
do
echo 0 > /sys/class/gpio/gpio172/value #led on
sleep 1
echo 1 > /sys/class/gpio/gpio172/value #led off
sleep 1
done

</syntaxhighlight>

==JavaScript (Node.js)==
Follow the directions at https://github.com/jdarling/radxa-nodejs-img
<syntaxhighlight lang="javascript" enclose="div">
var fs = require('fs');

// Enable the GPIO 172
fs.writeFileSync('/sys/class/gpio/export', 172);

// Set it to output
fs.writeFileSync('/sys/class/gpio/gpio172/direction', 'out');

// Turn on the LED
fs.writeFileSync('/ssy/class/gpio/gpio172/value', 1);

// Wait 1 second then turn it off
setTimeout(function(){
fs.writeFileSync('/ssy/class/gpio/gpio172/value', 0);
}, 1000);
</syntaxhighlight>
Or better yet, use https://github.com/jdarling/radxa-rock

==pin numbers ==
<syntaxhighlight lang="c" enclose="div">
#define NUM_GROUP 32
#define PIN_BASE 160

#define RK30_PIN0_PA0 (0*NUM_GROUP + PIN_BASE + 0)
#define RK30_PIN0_PA1 (0*NUM_GROUP + PIN_BASE + 1)
#define RK30_PIN0_PA2 (0*NUM_GROUP + PIN_BASE + 2)
#define RK30_PIN0_PA3 (0*NUM_GROUP + PIN_BASE + 3)
#define RK30_PIN0_PA4 (0*NUM_GROUP + PIN_BASE + 4)
#define RK30_PIN0_PA5 (0*NUM_GROUP + PIN_BASE + 5)
#define RK30_PIN0_PA6 (0*NUM_GROUP + PIN_BASE + 6)
#define RK30_PIN0_PA7 (0*NUM_GROUP + PIN_BASE + 7)
#define RK30_PIN0_PB0 (0*NUM_GROUP + PIN_BASE + 8)
#define RK30_PIN0_PB1 (0*NUM_GROUP + PIN_BASE + 9)
#define RK30_PIN0_PB2 (0*NUM_GROUP + PIN_BASE + 10)
#define RK30_PIN0_PB3 (0*NUM_GROUP + PIN_BASE + 11)
#define RK30_PIN0_PB4 (0*NUM_GROUP + PIN_BASE + 12)
#define RK30_PIN0_PB5 (0*NUM_GROUP + PIN_BASE + 13)
#define RK30_PIN0_PB6 (0*NUM_GROUP + PIN_BASE + 14)
#define RK30_PIN0_PB7 (0*NUM_GROUP + PIN_BASE + 15)
#define RK30_PIN0_PC0 (0*NUM_GROUP + PIN_BASE + 16)
#define RK30_PIN0_PC1 (0*NUM_GROUP + PIN_BASE + 17)
#define RK30_PIN0_PC2 (0*NUM_GROUP + PIN_BASE + 18)
#define RK30_PIN0_PC3 (0*NUM_GROUP + PIN_BASE + 19)
#define RK30_PIN0_PC4 (0*NUM_GROUP + PIN_BASE + 20)
#define RK30_PIN0_PC5 (0*NUM_GROUP + PIN_BASE + 21)
#define RK30_PIN0_PC6 (0*NUM_GROUP + PIN_BASE + 22)
#define RK30_PIN0_PC7 (0*NUM_GROUP + PIN_BASE + 23)
#define RK30_PIN0_PD0 (0*NUM_GROUP + PIN_BASE + 24)
#define RK30_PIN0_PD1 (0*NUM_GROUP + PIN_BASE + 25)
#define RK30_PIN0_PD2 (0*NUM_GROUP + PIN_BASE + 26)
#define RK30_PIN0_PD3 (0*NUM_GROUP + PIN_BASE + 27)
#define RK30_PIN0_PD4 (0*NUM_GROUP + PIN_BASE + 28)
#define RK30_PIN0_PD5 (0*NUM_GROUP + PIN_BASE + 29)
#define RK30_PIN0_PD6 (0*NUM_GROUP + PIN_BASE + 30)
#define RK30_PIN0_PD7 (0*NUM_GROUP + PIN_BASE + 31)

#define RK30_PIN1_PA0 (1*NUM_GROUP + PIN_BASE + 0)
#define RK30_PIN1_PA1 (1*NUM_GROUP + PIN_BASE + 1)
#define RK30_PIN1_PA2 (1*NUM_GROUP + PIN_BASE + 2)
#define RK30_PIN1_PA3 (1*NUM_GROUP + PIN_BASE + 3)
#define RK30_PIN1_PA4 (1*NUM_GROUP + PIN_BASE + 4)
#define RK30_PIN1_PA5 (1*NUM_GROUP + PIN_BASE + 5)
#define RK30_PIN1_PA6 (1*NUM_GROUP + PIN_BASE + 6)
#define RK30_PIN1_PA7 (1*NUM_GROUP + PIN_BASE + 7)
#define RK30_PIN1_PB0 (1*NUM_GROUP + PIN_BASE + 8)
#define RK30_PIN1_PB1 (1*NUM_GROUP + PIN_BASE + 9)
#define RK30_PIN1_PB2 (1*NUM_GROUP + PIN_BASE + 10)
#define RK30_PIN1_PB3 (1*NUM_GROUP + PIN_BASE + 11)
#define RK30_PIN1_PB4 (1*NUM_GROUP + PIN_BASE + 12)
#define RK30_PIN1_PB5 (1*NUM_GROUP + PIN_BASE + 13)
#define RK30_PIN1_PB6 (1*NUM_GROUP + PIN_BASE + 14)
#define RK30_PIN1_PB7 (1*NUM_GROUP + PIN_BASE + 15)
#define RK30_PIN1_PC0 (1*NUM_GROUP + PIN_BASE + 16)
#define RK30_PIN1_PC1 (1*NUM_GROUP + PIN_BASE + 17)
#define RK30_PIN1_PC2 (1*NUM_GROUP + PIN_BASE + 18)
#define RK30_PIN1_PC3 (1*NUM_GROUP + PIN_BASE + 19)
#define RK30_PIN1_PC4 (1*NUM_GROUP + PIN_BASE + 20)
#define RK30_PIN1_PC5 (1*NUM_GROUP + PIN_BASE + 21)
#define RK30_PIN1_PC6 (1*NUM_GROUP + PIN_BASE + 22)
#define RK30_PIN1_PC7 (1*NUM_GROUP + PIN_BASE + 23)
#define RK30_PIN1_PD0 (1*NUM_GROUP + PIN_BASE + 24)
#define RK30_PIN1_PD1 (1*NUM_GROUP + PIN_BASE + 25)
#define RK30_PIN1_PD2 (1*NUM_GROUP + PIN_BASE + 26)
#define RK30_PIN1_PD3 (1*NUM_GROUP + PIN_BASE + 27)
#define RK30_PIN1_PD4 (1*NUM_GROUP + PIN_BASE + 28)
#define RK30_PIN1_PD5 (1*NUM_GROUP + PIN_BASE + 29)
#define RK30_PIN1_PD6 (1*NUM_GROUP + PIN_BASE + 30)
#define RK30_PIN1_PD7 (1*NUM_GROUP + PIN_BASE + 31)

#define RK30_PIN2_PA0 (2*NUM_GROUP + PIN_BASE + 0)
#define RK30_PIN2_PA1 (2*NUM_GROUP + PIN_BASE + 1)
#define RK30_PIN2_PA2 (2*NUM_GROUP + PIN_BASE + 2)
#define RK30_PIN2_PA3 (2*NUM_GROUP + PIN_BASE + 3)
#define RK30_PIN2_PA4 (2*NUM_GROUP + PIN_BASE + 4)
#define RK30_PIN2_PA5 (2*NUM_GROUP + PIN_BASE + 5)
#define RK30_PIN2_PA6 (2*NUM_GROUP + PIN_BASE + 6)
#define RK30_PIN2_PA7 (2*NUM_GROUP + PIN_BASE + 7)
#define RK30_PIN2_PB0 (2*NUM_GROUP + PIN_BASE + 8)
#define RK30_PIN2_PB1 (2*NUM_GROUP + PIN_BASE + 9)
#define RK30_PIN2_PB2 (2*NUM_GROUP + PIN_BASE + 10)
#define RK30_PIN2_PB3 (2*NUM_GROUP + PIN_BASE + 11)
#define RK30_PIN2_PB4 (2*NUM_GROUP + PIN_BASE + 12)
#define RK30_PIN2_PB5 (2*NUM_GROUP + PIN_BASE + 13)
#define RK30_PIN2_PB6 (2*NUM_GROUP + PIN_BASE + 14)
#define RK30_PIN2_PB7 (2*NUM_GROUP + PIN_BASE + 15)
#define RK30_PIN2_PC0 (2*NUM_GROUP + PIN_BASE + 16)
#define RK30_PIN2_PC1 (2*NUM_GROUP + PIN_BASE + 17)
#define RK30_PIN2_PC2 (2*NUM_GROUP + PIN_BASE + 18)
#define RK30_PIN2_PC3 (2*NUM_GROUP + PIN_BASE + 19)
#define RK30_PIN2_PC4 (2*NUM_GROUP + PIN_BASE + 20)
#define RK30_PIN2_PC5 (2*NUM_GROUP + PIN_BASE + 21)
#define RK30_PIN2_PC6 (2*NUM_GROUP + PIN_BASE + 22)
#define RK30_PIN2_PC7 (2*NUM_GROUP + PIN_BASE + 23)
#define RK30_PIN2_PD0 (2*NUM_GROUP + PIN_BASE + 24)
#define RK30_PIN2_PD1 (2*NUM_GROUP + PIN_BASE + 25)
#define RK30_PIN2_PD2 (2*NUM_GROUP + PIN_BASE + 26)
#define RK30_PIN2_PD3 (2*NUM_GROUP + PIN_BASE + 27)
#define RK30_PIN2_PD4 (2*NUM_GROUP + PIN_BASE + 28)
#define RK30_PIN2_PD5 (2*NUM_GROUP + PIN_BASE + 29)
#define RK30_PIN2_PD6 (2*NUM_GROUP + PIN_BASE + 30)
#define RK30_PIN2_PD7 (2*NUM_GROUP + PIN_BASE + 31)

#define RK30_PIN3_PA0 (3*NUM_GROUP + PIN_BASE + 0)
#define RK30_PIN3_PA1 (3*NUM_GROUP + PIN_BASE + 1)
#define RK30_PIN3_PA2 (3*NUM_GROUP + PIN_BASE + 2)
#define RK30_PIN3_PA3 (3*NUM_GROUP + PIN_BASE + 3)
#define RK30_PIN3_PA4 (3*NUM_GROUP + PIN_BASE + 4)
#define RK30_PIN3_PA5 (3*NUM_GROUP + PIN_BASE + 5)
#define RK30_PIN3_PA6 (3*NUM_GROUP + PIN_BASE + 6)
#define RK30_PIN3_PA7 (3*NUM_GROUP + PIN_BASE + 7)
#define RK30_PIN3_PB0 (3*NUM_GROUP + PIN_BASE + 8)
#define RK30_PIN3_PB1 (3*NUM_GROUP + PIN_BASE + 9)
#define RK30_PIN3_PB2 (3*NUM_GROUP + PIN_BASE + 10)
#define RK30_PIN3_PB3 (3*NUM_GROUP + PIN_BASE + 11)
#define RK30_PIN3_PB4 (3*NUM_GROUP + PIN_BASE + 12)
#define RK30_PIN3_PB5 (3*NUM_GROUP + PIN_BASE + 13)
#define RK30_PIN3_PB6 (3*NUM_GROUP + PIN_BASE + 14)
#define RK30_PIN3_PB7 (3*NUM_GROUP + PIN_BASE + 15)
#define RK30_PIN3_PC0 (3*NUM_GROUP + PIN_BASE + 16)
#define RK30_PIN3_PC1 (3*NUM_GROUP + PIN_BASE + 17)
#define RK30_PIN3_PC2 (3*NUM_GROUP + PIN_BASE + 18)
#define RK30_PIN3_PC3 (3*NUM_GROUP + PIN_BASE + 19)
#define RK30_PIN3_PC4 (3*NUM_GROUP + PIN_BASE + 20)
#define RK30_PIN3_PC5 (3*NUM_GROUP + PIN_BASE + 21)
#define RK30_PIN3_PC6 (3*NUM_GROUP + PIN_BASE + 22)
#define RK30_PIN3_PC7 (3*NUM_GROUP + PIN_BASE + 23)
#define RK30_PIN3_PD0 (3*NUM_GROUP + PIN_BASE + 24)
#define RK30_PIN3_PD1 (3*NUM_GROUP + PIN_BASE + 25)
#define RK30_PIN3_PD2 (3*NUM_GROUP + PIN_BASE + 26)
#define RK30_PIN3_PD3 (3*NUM_GROUP + PIN_BASE + 27)
#define RK30_PIN3_PD4 (3*NUM_GROUP + PIN_BASE + 28)
#define RK30_PIN3_PD5 (3*NUM_GROUP + PIN_BASE + 29)
#define RK30_PIN3_PD6 (3*NUM_GROUP + PIN_BASE + 30)
#define RK30_PIN3_PD7 (3*NUM_GROUP + PIN_BASE + 31)
</syntaxhighlight>

Radxa Wiki - User contributions [en]

Rock/GPIO