[vc_row][vc_column width=”1/1″][vc_tour][vc_tab title=”Introduce” tab_id=”1394070611-1-58″][vc_column_text]

Now I operate pcduino basically through arduinoIDE.

For  I’m not particularly understand the Linux application programming,

but I’m very curious about it, and want to put arduinoIDE aside to operating hardware,

after a period of time I finally find out the way .

So I build a project and write a simple test code.

[/vc_column_text][/vc_tab][vc_tab title=”Code instructions” tab_id=”1394070611-2-53″][vc_column_text][/vc_column_text][vc_column_text]

voidGpoiInitial(int*fd_pin,int*fd_mode,intpinNum,intmode)；

This function is used to initialize the GPIO, the first two are the two file object point,

once initialize well , we could operate the corresponding GPIO through the pointer.

PinNum need the specific GPIO number, it was the same with arduino, mode has the

OUTPUT and INPUT mode.

intSetGpio(intfd,bool High)；

This function is used to set the GPIO state, fd is initial file pointer,

H is referred to whether set the GPIO to high level, set high level for the truth,

and set low level for the false.

Makefile is a common makefile, and you can use it to manage other project.

[/vc_column_text][/vc_tab][vc_tab title=”Test code” tab_id=”1394128685441-2-1″][vc_column_text]

#include<stdio.h>
#include<fcntl.h>
#include<stdlib.h>

#include"delay.h"
#include"typedef.h"

#define TEST_PIN_NUM  2

int WriteToGpioFile(int fd,char* buf,int len)
{
  lseek(fd,0,SEEK_SET);
  return write(fd,buf,len);
}

void GpoiInitial(int *fd_pin,int *fd_mode,int pinNum,int mode)
{
  char *Str;

  Str = (char*)malloc(sizeof("/sys/devices/virtual/misc/gpio/mode/gpio1"));
  sprintf(Str, "%s%s%d", GPIO_PIN_DIR, GPIO_IF_PREFIX, pinNum);
  *fd_pin = open(Str,O_RDWR);
  if(*fd_pin < 0)
  {
    printf("Faild to open gpio pin%dn",pinNum);
    free(Str);
    return;
  }
  sprintf(Str, "%s%s%d", GPIO_MODE_DIR, GPIO_IF_PREFIX, pinNum);
  *fd_mode = open(Str,O_RDWR);
  if(*fd_mode < 0)
  {
    printf("Failed to open gpio mode%dn",pinNum);
    free(Str);
    return;
  }
  if(0>WriteToGpioFile(*fd_mode,(char*)((mode & 1)?"1":"0"),sizeof("1")))
  {
    printf("Write to gpio mode failedn");
    free(Str);
    return;
  }
  printf("gpio initial successn");
  free(Str);
}

int SetGpio(int fd,BOOL High)
{
  if(0>WriteToGpioFile(fd,(char*)(High ? "1" : "0" ),sizeof("x")))
  {
    printf("Write to gpio pin failedn");
    return -1;
  }
  return 0;
}

int main(int arg)
{
  int fd_pin_led;
  int fd_mode_led;
  BOOL led_on;

  led_on = FALSE;

  GpoiInitial(&fd_pin_led,&fd_mode_led,TEST_PIN_NUM,OUTPUT);

  while(1)
  {
    delay_ms(500);
    led_on = !led_on;
    SetGpio(fd_pin_led,led_on); 
  }

  return 1;
}

[/vc_column_text][/vc_tab][/vc_tour][/vc_column][/vc_row]