Difference between revisions of "Rock/GPIO"

Latest revision as of 09:05, 16 June 2015

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

wiringX is a modular approach to several GPIO interfaces. WiringX officially supports radxa rock/pro/lite, please check Rock/wiringX for how to use it.

#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);

}

Python

Python library.

   sudo apt-get install gcc  python-dev

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)

Shell

#!/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

JavaScript (Node.js)

   Follow the directions at https://github.com/jdarling/radxa-nodejs-img

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);

   Or better yet, use https://github.com/jdarling/radxa-rock

pin numbers

Pin number for kernel 3.0.36 starts from 160. For kernel version 3.10 and later(device tree based), the pin number starts from 0.

Kernel 3.0.36

GPIO0_A0 = 160
GPIO0_A1 = 161
GPIO0_A2 = 162
GPIO0_A3 = 163
GPIO0_A4 = 164
GPIO0_A5 = 165
GPIO0_A6 = 166
GPIO0_A7 = 167
GPIO0_B0 = 168
GPIO0_B1 = 169
GPIO0_B2 = 170
GPIO0_B3 = 171
GPIO0_B4 = 172
GPIO0_B5 = 173
GPIO0_B6 = 174
GPIO0_B7 = 175
GPIO0_C0 = 176
GPIO0_C1 = 177
GPIO0_C2 = 178
GPIO0_C3 = 179
GPIO0_C4 = 180
GPIO0_C5 = 181
GPIO0_C6 = 182
GPIO0_C7 = 183
GPIO0_D0 = 184
GPIO0_D1 = 185
GPIO0_D2 = 186
GPIO0_D3 = 187
GPIO0_D4 = 188
GPIO0_D5 = 189
GPIO0_D6 = 190
GPIO0_D7 = 191
GPIO1_A0 = 192
GPIO1_A1 = 193
GPIO1_A2 = 194
GPIO1_A3 = 195
GPIO1_A4 = 196
GPIO1_A5 = 197
GPIO1_A6 = 198
GPIO1_A7 = 199
GPIO1_B0 = 200
GPIO1_B1 = 201
GPIO1_B2 = 202
GPIO1_B3 = 203
GPIO1_B4 = 204
GPIO1_B5 = 205
GPIO1_B6 = 206
GPIO1_B7 = 207
GPIO1_C0 = 208
GPIO1_C1 = 209
GPIO1_C2 = 210
GPIO1_C3 = 211
GPIO1_C4 = 212
GPIO1_C5 = 213
GPIO1_C6 = 214
GPIO1_C7 = 215
GPIO1_D0 = 216
GPIO1_D1 = 217
GPIO1_D2 = 218
GPIO1_D3 = 219
GPIO1_D4 = 220
GPIO1_D5 = 221
GPIO1_D6 = 222
GPIO1_D7 = 223
GPIO2_A0 = 224
GPIO2_A1 = 225
GPIO2_A2 = 226
GPIO2_A3 = 227
GPIO2_A4 = 228
GPIO2_A5 = 229
GPIO2_A6 = 230
GPIO2_A7 = 231
GPIO2_B0 = 232
GPIO2_B1 = 233
GPIO2_B2 = 234
GPIO2_B3 = 235
GPIO2_B4 = 236
GPIO2_B5 = 237
GPIO2_B6 = 238
GPIO2_B7 = 239
GPIO2_C0 = 240
GPIO2_C1 = 241
GPIO2_C2 = 242
GPIO2_C3 = 243
GPIO2_C4 = 244
GPIO2_C5 = 245
GPIO2_C6 = 246
GPIO2_C7 = 247
GPIO2_D0 = 248
GPIO2_D1 = 249
GPIO2_D2 = 250
GPIO2_D3 = 251
GPIO2_D4 = 252
GPIO2_D5 = 253
GPIO2_D6 = 254
GPIO2_D7 = 255
GPIO3_A0 = 256
GPIO3_A1 = 257
GPIO3_A2 = 258
GPIO3_A3 = 259
GPIO3_A4 = 260
GPIO3_A5 = 261
GPIO3_A6 = 262
GPIO3_A7 = 263
GPIO3_B0 = 264
GPIO3_B1 = 265
GPIO3_B2 = 266
GPIO3_B3 = 267
GPIO3_B4 = 268
GPIO3_B5 = 269
GPIO3_B6 = 270
GPIO3_B7 = 271
GPIO3_C0 = 272
GPIO3_C1 = 273
GPIO3_C2 = 274
GPIO3_C3 = 275
GPIO3_C4 = 276
GPIO3_C5 = 277
GPIO3_C6 = 278
GPIO3_C7 = 279
GPIO3_D0 = 280
GPIO3_D1 = 281
GPIO3_D2 = 282
GPIO3_D3 = 283
GPIO3_D4 = 284
GPIO3_D5 = 285
GPIO3_D6 = 286
GPIO3_D7 = 287

Kernel 3.10 and later

GPIO0_A0 = 0
GPIO0_A1 = 1
GPIO0_A2 = 2
GPIO0_A3 = 3
GPIO0_A4 = 4
GPIO0_A5 = 5
GPIO0_A6 = 6
GPIO0_A7 = 7
GPIO0_B0 = 8
GPIO0_B1 = 9
GPIO0_B2 = 10
GPIO0_B3 = 11
GPIO0_B4 = 12
GPIO0_B5 = 13
GPIO0_B6 = 14
GPIO0_B7 = 15
GPIO0_C0 = 16
GPIO0_C1 = 17
GPIO0_C2 = 18
GPIO0_C3 = 19
GPIO0_C4 = 20
GPIO0_C5 = 21
GPIO0_C6 = 22
GPIO0_C7 = 23
GPIO0_D0 = 24
GPIO0_D1 = 25
GPIO0_D2 = 26
GPIO0_D3 = 27
GPIO0_D4 = 28
GPIO0_D5 = 29
GPIO0_D6 = 30
GPIO0_D7 = 31
GPIO1_A0 = 32
GPIO1_A1 = 33
GPIO1_A2 = 34
GPIO1_A3 = 35
GPIO1_A4 = 36
GPIO1_A5 = 37
GPIO1_A6 = 38
GPIO1_A7 = 39
GPIO1_B0 = 40
GPIO1_B1 = 41
GPIO1_B2 = 42
GPIO1_B3 = 43
GPIO1_B4 = 44
GPIO1_B5 = 45
GPIO1_B6 = 46
GPIO1_B7 = 47
GPIO1_C0 = 48
GPIO1_C1 = 49
GPIO1_C2 = 50
GPIO1_C3 = 51
GPIO1_C4 = 52
GPIO1_C5 = 53
GPIO1_C6 = 54
GPIO1_C7 = 55
GPIO1_D0 = 56
GPIO1_D1 = 57
GPIO1_D2 = 58
GPIO1_D3 = 59
GPIO1_D4 = 60
GPIO1_D5 = 61
GPIO1_D6 = 62
GPIO1_D7 = 63
GPIO2_A0 = 64
GPIO2_A1 = 65
GPIO2_A2 = 66
GPIO2_A3 = 67
GPIO2_A4 = 68
GPIO2_A5 = 69
GPIO2_A6 = 70
GPIO2_A7 = 71
GPIO2_B0 = 72
GPIO2_B1 = 73
GPIO2_B2 = 74
GPIO2_B3 = 75
GPIO2_B4 = 76
GPIO2_B5 = 77
GPIO2_B6 = 78
GPIO2_B7 = 79
GPIO2_C0 = 80
GPIO2_C1 = 81
GPIO2_C2 = 82
GPIO2_C3 = 83
GPIO2_C4 = 84
GPIO2_C5 = 85
GPIO2_C6 = 86
GPIO2_C7 = 87
GPIO2_D0 = 88
GPIO2_D1 = 89
GPIO2_D2 = 90
GPIO2_D3 = 91
GPIO2_D4 = 92
GPIO2_D5 = 93
GPIO2_D6 = 94
GPIO2_D7 = 95
GPIO3_A0 = 96
GPIO3_A1 = 97
GPIO3_A2 = 98
GPIO3_A3 = 99
GPIO3_A4 = 100
GPIO3_A5 = 101
GPIO3_A6 = 102
GPIO3_A7 = 103
GPIO3_B0 = 104
GPIO3_B1 = 105
GPIO3_B2 = 106
GPIO3_B3 = 107
GPIO3_B4 = 108
GPIO3_B5 = 109
GPIO3_B6 = 110
GPIO3_B7 = 111
GPIO3_C0 = 112
GPIO3_C1 = 113
GPIO3_C2 = 114
GPIO3_C3 = 115
GPIO3_C4 = 116
GPIO3_C5 = 117
GPIO3_C6 = 118
GPIO3_C7 = 119
GPIO3_D0 = 120
GPIO3_D1 = 121
GPIO3_D2 = 122
GPIO3_D3 = 123
GPIO3_D4 = 124
GPIO3_D5 = 125
GPIO3_D6 = 126
GPIO3_D7 = 127

@@ Line 1: / Line 1: @@
-==pin numbers ==
+{{rock_header}}
+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 ==
+wiringX is a modular approach to several GPIO interfaces. WiringX officially supports radxa rock/pro/lite, please check [[Rock/wiringX]] for how to use it.
 <syntaxhighlight lang="c" enclose="div">
-#define      NUM_GROUP 32
-#define      PIN_BASE            160
-#define	RK30_PIN0_PA0		(0*NUM_GROUP + PIN_BASE + 0)
+#include <stdio.h>
-#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)
+int main()
-#define	RK30_PIN1_PA1		(1*NUM_GROUP + PIN_BASE + 1)
+{
-#define	RK30_PIN1_PA2		(1*NUM_GROUP + PIN_BASE + 2)
+  FILE *fp = fopen("/sys/class/gpio/export", "w");
-#define	RK30_PIN1_PA3		(1*NUM_GROUP + PIN_BASE + 3)
+  if( !fp )
-#define	RK30_PIN1_PA4		(1*NUM_GROUP + PIN_BASE + 4)
+  {
-#define	RK30_PIN1_PA5		(1*NUM_GROUP + PIN_BASE + 5)
+    printf("error open export file");
-#define	RK30_PIN1_PA6		(1*NUM_GROUP + PIN_BASE + 6)
+    return 1;
-#define	RK30_PIN1_PA7		(1*NUM_GROUP + PIN_BASE + 7)
+  }
-#define	RK30_PIN1_PB0		(1*NUM_GROUP + PIN_BASE + 8)
+  fprintf(fp, "%d", 172);
-#define	RK30_PIN1_PB1		(1*NUM_GROUP + PIN_BASE + 9)
+  fclose(fp);
-#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)
+  fp = fopen("/sys/class/gpio/gpio175/direction", "w");
-#define	RK30_PIN2_PA1		(2*NUM_GROUP + PIN_BASE + 1)
-#define	RK30_PIN2_PA2		(2*NUM_GROUP + PIN_BASE + 2)
+  if( !fp )
-#define	RK30_PIN2_PA3		(2*NUM_GROUP + PIN_BASE + 3)
+  {
-#define	RK30_PIN2_PA4		(2*NUM_GROUP + PIN_BASE + 4)
+    printf("error open export file");
-#define	RK30_PIN2_PA5		(2*NUM_GROUP + PIN_BASE + 5)
+    return 1;
-#define	RK30_PIN2_PA6		(2*NUM_GROUP + PIN_BASE + 6)
+  }
-#define	RK30_PIN2_PA7		(2*NUM_GROUP + PIN_BASE + 7)
+  fprintf(fp, "%s", "out");
-#define	RK30_PIN2_PB0		(2*NUM_GROUP + PIN_BASE + 8)
+  fclose(fp);
-#define	RK30_PIN2_PB1		(2*NUM_GROUP + PIN_BASE + 9)
-#define	RK30_PIN2_PB2		(2*NUM_GROUP + PIN_BASE + 10)
+  fp = fopen("/sys/class/gpio/gpio175/value", "w");
-#define	RK30_PIN2_PB3		(2*NUM_GROUP + PIN_BASE + 11)
-#define	RK30_PIN2_PB4		(2*NUM_GROUP + PIN_BASE + 12)
+  if( !fp )
-#define	RK30_PIN2_PB5		(2*NUM_GROUP + PIN_BASE + 13)
+  {
-#define	RK30_PIN2_PB6		(2*NUM_GROUP + PIN_BASE + 14)
+    printf("error open export file");
-#define	RK30_PIN2_PB7		(2*NUM_GROUP + PIN_BASE + 15)
+    return 1;
-#define	RK30_PIN2_PC0		(2*NUM_GROUP + PIN_BASE + 16)
+  }
-#define	RK30_PIN2_PC1		(2*NUM_GROUP + PIN_BASE + 17)
+  fprintf(fp, "%d", 1);
-#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>
+== 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 ==
+Pin number for kernel 3.0.36 starts from 160. For kernel version 3.10 and later(device tree based), the pin number starts from 0.
+===Kernel 3.0.36===
+<pre>
+GPIO0_A0 = 160
+GPIO0_A1 = 161
+GPIO0_A2 = 162
+GPIO0_A3 = 163
+GPIO0_A4 = 164
+GPIO0_A5 = 165
+GPIO0_A6 = 166
+GPIO0_A7 = 167
+GPIO0_B0 = 168
+GPIO0_B1 = 169
+GPIO0_B2 = 170
+GPIO0_B3 = 171
+GPIO0_B4 = 172
+GPIO0_B5 = 173
+GPIO0_B6 = 174
+GPIO0_B7 = 175
+GPIO0_C0 = 176
+GPIO0_C1 = 177
+GPIO0_C2 = 178
+GPIO0_C3 = 179
+GPIO0_C4 = 180
+GPIO0_C5 = 181
+GPIO0_C6 = 182
+GPIO0_C7 = 183
+GPIO0_D0 = 184
+GPIO0_D1 = 185
+GPIO0_D2 = 186
+GPIO0_D3 = 187
+GPIO0_D4 = 188
+GPIO0_D5 = 189
+GPIO0_D6 = 190
+GPIO0_D7 = 191
+GPIO1_A0 = 192
+GPIO1_A1 = 193
+GPIO1_A2 = 194
+GPIO1_A3 = 195
+GPIO1_A4 = 196
+GPIO1_A5 = 197
+GPIO1_A6 = 198
+GPIO1_A7 = 199
+GPIO1_B0 = 200
+GPIO1_B1 = 201
+GPIO1_B2 = 202
+GPIO1_B3 = 203
+GPIO1_B4 = 204
+GPIO1_B5 = 205
+GPIO1_B6 = 206
+GPIO1_B7 = 207
+GPIO1_C0 = 208
+GPIO1_C1 = 209
+GPIO1_C2 = 210
+GPIO1_C3 = 211
+GPIO1_C4 = 212
+GPIO1_C5 = 213
+GPIO1_C6 = 214
+GPIO1_C7 = 215
+GPIO1_D0 = 216
+GPIO1_D1 = 217
+GPIO1_D2 = 218
+GPIO1_D3 = 219
+GPIO1_D4 = 220
+GPIO1_D5 = 221
+GPIO1_D6 = 222
+GPIO1_D7 = 223
+GPIO2_A0 = 224
+GPIO2_A1 = 225
+GPIO2_A2 = 226
+GPIO2_A3 = 227
+GPIO2_A4 = 228
+GPIO2_A5 = 229
+GPIO2_A6 = 230
+GPIO2_A7 = 231
+GPIO2_B0 = 232
+GPIO2_B1 = 233
+GPIO2_B2 = 234
+GPIO2_B3 = 235
+GPIO2_B4 = 236
+GPIO2_B5 = 237
+GPIO2_B6 = 238
+GPIO2_B7 = 239
+GPIO2_C0 = 240
+GPIO2_C1 = 241
+GPIO2_C2 = 242
+GPIO2_C3 = 243
+GPIO2_C4 = 244
+GPIO2_C5 = 245
+GPIO2_C6 = 246
+GPIO2_C7 = 247
+GPIO2_D0 = 248
+GPIO2_D1 = 249
+GPIO2_D2 = 250
+GPIO2_D3 = 251
+GPIO2_D4 = 252
+GPIO2_D5 = 253
+GPIO2_D6 = 254
+GPIO2_D7 = 255
+GPIO3_A0 = 256
+GPIO3_A1 = 257
+GPIO3_A2 = 258
+GPIO3_A3 = 259
+GPIO3_A4 = 260
+GPIO3_A5 = 261
+GPIO3_A6 = 262
+GPIO3_A7 = 263
+GPIO3_B0 = 264
+GPIO3_B1 = 265
+GPIO3_B2 = 266
+GPIO3_B3 = 267
+GPIO3_B4 = 268
+GPIO3_B5 = 269
+GPIO3_B6 = 270
+GPIO3_B7 = 271
+GPIO3_C0 = 272
+GPIO3_C1 = 273
+GPIO3_C2 = 274
+GPIO3_C3 = 275
+GPIO3_C4 = 276
+GPIO3_C5 = 277
+GPIO3_C6 = 278
+GPIO3_C7 = 279
+GPIO3_D0 = 280
+GPIO3_D1 = 281
+GPIO3_D2 = 282
+GPIO3_D3 = 283
+GPIO3_D4 = 284
+GPIO3_D5 = 285
+GPIO3_D6 = 286
+GPIO3_D7 = 287
+</pre>
+===Kernel 3.10 and later===
+<pre>
+GPIO0_A0 = 0
+GPIO0_A1 = 1
+GPIO0_A2 = 2
+GPIO0_A3 = 3
+GPIO0_A4 = 4
+GPIO0_A5 = 5
+GPIO0_A6 = 6
+GPIO0_A7 = 7
+GPIO0_B0 = 8
+GPIO0_B1 = 9
+GPIO0_B2 = 10
+GPIO0_B3 = 11
+GPIO0_B4 = 12
+GPIO0_B5 = 13
+GPIO0_B6 = 14
+GPIO0_B7 = 15
+GPIO0_C0 = 16
+GPIO0_C1 = 17
+GPIO0_C2 = 18
+GPIO0_C3 = 19
+GPIO0_C4 = 20
+GPIO0_C5 = 21
+GPIO0_C6 = 22
+GPIO0_C7 = 23
+GPIO0_D0 = 24
+GPIO0_D1 = 25
+GPIO0_D2 = 26
+GPIO0_D3 = 27
+GPIO0_D4 = 28
+GPIO0_D5 = 29
+GPIO0_D6 = 30
+GPIO0_D7 = 31
+GPIO1_A0 = 32
+GPIO1_A1 = 33
+GPIO1_A2 = 34
+GPIO1_A3 = 35
+GPIO1_A4 = 36
+GPIO1_A5 = 37
+GPIO1_A6 = 38
+GPIO1_A7 = 39
+GPIO1_B0 = 40
+GPIO1_B1 = 41
+GPIO1_B2 = 42
+GPIO1_B3 = 43
+GPIO1_B4 = 44
+GPIO1_B5 = 45
+GPIO1_B6 = 46
+GPIO1_B7 = 47
+GPIO1_C0 = 48
+GPIO1_C1 = 49
+GPIO1_C2 = 50
+GPIO1_C3 = 51
+GPIO1_C4 = 52
+GPIO1_C5 = 53
+GPIO1_C6 = 54
+GPIO1_C7 = 55
+GPIO1_D0 = 56
+GPIO1_D1 = 57
+GPIO1_D2 = 58
+GPIO1_D3 = 59
+GPIO1_D4 = 60
+GPIO1_D5 = 61
+GPIO1_D6 = 62
+GPIO1_D7 = 63
+GPIO2_A0 = 64
+GPIO2_A1 = 65
+GPIO2_A2 = 66
+GPIO2_A3 = 67
+GPIO2_A4 = 68
+GPIO2_A5 = 69
+GPIO2_A6 = 70
+GPIO2_A7 = 71
+GPIO2_B0 = 72
+GPIO2_B1 = 73
+GPIO2_B2 = 74
+GPIO2_B3 = 75
+GPIO2_B4 = 76
+GPIO2_B5 = 77
+GPIO2_B6 = 78
+GPIO2_B7 = 79
+GPIO2_C0 = 80
+GPIO2_C1 = 81
+GPIO2_C2 = 82
+GPIO2_C3 = 83
+GPIO2_C4 = 84
+GPIO2_C5 = 85
+GPIO2_C6 = 86
+GPIO2_C7 = 87
+GPIO2_D0 = 88
+GPIO2_D1 = 89
+GPIO2_D2 = 90
+GPIO2_D3 = 91
+GPIO2_D4 = 92
+GPIO2_D5 = 93
+GPIO2_D6 = 94
+GPIO2_D7 = 95
+GPIO3_A0 = 96
+GPIO3_A1 = 97
+GPIO3_A2 = 98
+GPIO3_A3 = 99
+GPIO3_A4 = 100
+GPIO3_A5 = 101
+GPIO3_A6 = 102
+GPIO3_A7 = 103
+GPIO3_B0 = 104
+GPIO3_B1 = 105
+GPIO3_B2 = 106
+GPIO3_B3 = 107
+GPIO3_B4 = 108
+GPIO3_B5 = 109
+GPIO3_B6 = 110
+GPIO3_B7 = 111
+GPIO3_C0 = 112
+GPIO3_C1 = 113
+GPIO3_C2 = 114
+GPIO3_C3 = 115
+GPIO3_C4 = 116
+GPIO3_C5 = 117
+GPIO3_C6 = 118
+GPIO3_C7 = 119
+GPIO3_D0 = 120
+GPIO3_D1 = 121
+GPIO3_D2 = 122
+GPIO3_D3 = 123
+GPIO3_D4 = 124
+GPIO3_D5 = 125
+GPIO3_D6 = 126
+GPIO3_D7 = 127
+</pre>