CubieBoard Docs

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====Using sunxi-gpio kernel module====

 1. Make sure that the newest firmware has loaded the  module gpio-sunxi.ko by default. (Use the command 'lsmod' to see the module in the list.)\\
 2. Modify script.bin that configure cubieboard file.
   *download the sunxi-tools
<code>
   $ git clone git://github.com/linux-sunxi/sunxi-tools.git
   $ cd sunxi-tools
   $ make
</code>
   *modify script.bin
<code>   
   $ mount /dev/nanda /dev/mnt
   $ cp /mnt/script.bin ./
   $ ./bin2fex script.bin >./script.fex
   $ vi script.fex
</code>
default GPIO paragraph setup:
<code>
[gpio_para]
gpio_used =1
gpio_num = 2
gpio_pin_1 = port: PH20<1><default><default><1>
gpio_pin_2 = port: PH21<1><default><default><1>
</code>
modify GPIO port want to use i.e.:
<code>
[gpio_para]
gpio_used =1
gpio_num = 3
gpio_pin_1 = port: PD01<1><default><default><1>
gpio_pin_2 = port: PD02<1><default><default><1>
gpio_pin_3 = port: PD03<1><default><default><1>
</code>
Save the file, then
<code>
  $ ./fex2bin script.fex >./script.bin
  $ cp  script.bin /mnt 
  $ reboot
</code>
After rebooted the cubieboard, the new setup will be effective.

 3. Operate GPIO port i.e.:

  *open the GPIO PD01~03 
<code>
  $ echo 1 > /sys/class/gpio/export 
  $ echo 2 > /sys/class/gpio/export   
  $ echo 3 > /sys/class/gpio/export 
</code>
Below the /sys/class/gpio has appeared directories named gpio1_pd01, gpio1_pd02, gpio1_pd03.
  *set the PD01 por as output 
<code>
  $ cd /sys/class/gpio/gpio1_pd01
  $ echo out > direction
</code>
  *set the PD01 port as high
<code>
  $ echo 1 > value 
</code>
  *set the PD01 port as low
<code>
  $ echo 0 > value
</code>

====Using C program without driver====

The demo control the PD01 port blink led  :<code>
#include <stdlib.h>
#include <stdio.h>

#include "gpio_lib.h"
#define PD0    SUNXI_GPD(0)
#define PD1    SUNXI_GPD(1)
#define PD2    SUNXI_GPD(2)
#define PD3    SUNXI_GPD(3)
#define PD4    SUNXI_GPD(4)
#define MISO    SUNXI_GPE(3)
#define MOSI    SUNXI_GPE(2)
#define SCK     SUNXI_GPE(1)
#define CS      SUNXI_GPE(0)

int main()
{
    if(SETUP_OK!=sunxi_gpio_init()){
        printf("Failed to initialize GPIO\n");
        return -1;
    }

    if(SETUP_OK!=sunxi_gpio_set_cfgpin(PD01,OUTPUT)){
        printf("Failed to config GPIO pin\n");
        return -1;
    }

    int i;
    for(i=0;i<5;i++){
        if(sunxi_gpio_output(PD01,HIGH)){
            printf("Failed to set GPIO pin value\n");
            return -1;
        }

        usleep(500000);
        if(sunxi_gpio_output(PD01,LOW)){
            printf("Failed to set GPIO pin value\n");
            return -1;
        }
        usleep(500000);
    }

    sunxi_gpio_cleanup();

    return 0;
   
}
</code>
Save as gpio.c,download [[http://dl.cubieboard.org/software/libs/gpio.tar|gpio_lib]],then<code>
gcc gpio_lib.c -c
gcc gpio.c -c
gcc gpio.o gpio_lib.o -o gpio
./gpio
</code>
If you have used a led connect GND and PD01 port,the led is going to blink in cycle time.\\
Of course you can define and use other port .\\
Use above the method  like high-delay-low-delay  to simulate  PWM output .\\
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