send_com.c

采用gpio口来控制串口扩展芯片的驱动和测试程序

#include <fcntl.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <termios.h>
#include <unistd.h>
#include <stdlib.h>

//#include "sp2339.h"
#define IOCTL_GPIO_INIT			1
#define IOCTL_GPIO_WRITE		2
#define IOCTL_GPIO_READ			3

#define     Nop      0x00
#define     Reset     0x01
#define     Sleep     0x02

#define     P0_only   0x0C
#define     P1_only   0x0D
#define     P2_only   0x0E

void init_sp2339(int, char, unsigned long);
void send_change(char *,char *);


static int fd;        //= open("/dev/ttyS0", O_RDWR|O_NOCTTY);
static int fd_gpio;   //= open("/dev/ttyS0", O_RDWR|O_NOCTTY);

int main(int argc, char *argv[])
{
	int size;
	struct termios oldt,newt; 
    fd = open("/dev/ttyS1", O_RDWR|O_NOCTTY);
    if(fd>=0)
    {
        tcgetattr(fd, &oldt);
        tcflush(fd, TCIOFLUSH);                         //Ensure there are nothing in buff when begin to transfer
        newt = oldt;
	cfsetispeed (&newt, B38400);
	cfsetospeed (&newt, B38400);
        newt.c_cflag|CS8;
        newt.c_cflag|CLOCAL;
        newt.c_cflag|CREAD;
        newt.c_iflag=IGNPAR;
        newt.c_oflag=0;
        newt.c_lflag=0;
        newt.c_cc[VMIN]=1;
        newt.c_cc[VTIME]=200;
        tcflush(fd,TCSANOW);
        tcsetattr(fd,TCSANOW,&newt);
	      printf ("init  COM2 complete!\n");      
    }
    else
    	{perror ("Open serial failure");
         return -1;
	}
 /* 
       fd_gpio = open("/dev/gpio", O_RDWR|O_NOCTTY);  
	printf("the file value of gpio is %d \n",fd);
	ioctl(fd_gpio, IOCTL_GPIO_INIT, 0);
	
      char init_com=(char)(0x01);	
	 int res=write(fd,&init_com,1);
	 printf("yes %d\n",res);
	 
  */  char buffer[256];  
   
	 size = read(fd,buffer,256);
	{
	      
		buffer[size]='\0';
		printf("Read return is: %s\n",buffer);
	}

  tcsetattr(fd, TCSADRAIN, &oldt);
    close(fd);   
 //   close(fd_gpio);
}