Rock/GPIO

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