|
/***************** serial send ***************/
#include <stdio.h> /*标准输入输出定义*/
#include <stdlib.h> /*标准函数库定义*/
#include <unistd.h> /*Unix标准函数定义*/
#include <sys/types.h> /**/
#include <sys/stat.h> /**/
#include <fcntl.h> /*文件控制定义*/
#include <termios.h> /*PPSIX终端控制定义*/
#include <errno.h> /*错误号定义*/
#define FALSE -1
/*[url=]**@brief[/url] 设置串口通信速率
[email=*@param]*@param[/email] fd 类型 int 打开串口的文件句柄
[email=*@param]*@param[/email] speed 类型 int 串口速度
[email=*@return]*@return[/email] void*/
int speed_arr[] = {B115200,B38400, B19200, B9600, B4800, B2400, B1200, B300,
B38400, B19200, B9600, B4800, B2400, B1200, B300, };
int name_arr[] = {115200,38400, 19200, 9600, 4800, 2400, 1200, 300,
38400, 19200, 9600, 4800, 2400, 1200, 300, };
int set_speed(int fd, int speed)
{
int i;
int status;
struct termios Opt;
tcgetattr(fd, &Opt);
for ( i= 0; i < sizeof(speed_arr) / sizeof(int); i++)
{
if (speed == name_arr)
{
tcflush(fd, TCIOFLUSH);
cfsetispeed(&Opt, speed_arr);
cfsetospeed(&Opt, speed_arr);
status = tcsetattr(fd, TCSANOW, &Opt);
if (status != 0)
perror("tcsetattr fd1");
return FALSE;
}
tcflush(fd,TCIOFLUSH);
}
}
/**
[email=*@brief]*@brief[/email] 设置串口数据位，停止位和效验位
[email=*@param]*@param[/email] fd 类型 int 打开的串口文件句柄*
[email=*@param]*@param[/email] databits 类型 int 数据位 取值 为 7 或者8*
[email=*@param]*@param[/email] stopbits 类型 int 停止位 取值为 1 或者2*
[email=*@param]*@param[/email] parity 类型 int 效验类型 取值为N,E,O,,S
*/
int set_Parity(int fd,int databits,int stopbits,int parity)
{
struct termios options;
if ( tcgetattr( fd,&options) != 0)
{
perror("SetupSerial 1");
return(FALSE);
}
options.c_cflag &= ~CSIZE;
switch (databits) /*设置数据位数*/
{
case 7:
options.c_cflag |= CS7;
break;
case 8:
options.c_cflag |= CS8;
break;
default:
fprintf(stderr,"Unsupported data size\n");
return(FALSE);
}
switch (parity)
{
case 'n':
case 'N':
options.c_cflag &= ~PARENB; /* Clear parity enable */
options.c_iflag &= ~INPCK; /* Enable parity checking */
break;
case 'o':
case 'O':
options.c_cflag |= (PARODD | PARENB); /* 设置为奇效验*/
options.c_iflag |= INPCK; /* Disnable parity checking */
break;
case 'e':
case 'E':
options.c_cflag |= PARENB; /* Enable parity */
options.c_cflag &= ~PARODD; /* 转换为偶效验*/
options.c_iflag |= INPCK; /* Disnable parity checking */
break;
case 'S':
case 's': /*as no parity*/
options.c_cflag &= ~PARENB;
options.c_cflag &= ~CSTOPB;
break;
default:
fprintf(stderr,"Unsupported parity\n");
return (FALSE);
}
/* 设置停止位*/
switch (stopbits)
{
case 1:
options.c_cflag &= ~CSTOPB;
break;
case 2:
options.c_cflag |= CSTOPB;
break;
default:
fprintf(stderr,"Unsupported stop bits\n");
return (FALSE);
}
/* Set input parity option */
if (parity != 'n')
options.c_iflag |= INPCK;
options.c_cc[VTIME] = 150; // 15 seconds
options.c_cc[VMIN] = 0;
tcflush(fd,TCIFLUSH); /* Update the options and do it NOW */
if (tcsetattr(fd,TCSANOW,&options) != 0)
{
perror("SetupSerial 3");
return (FALSE);
}
return (0);
}
/**
[email=*@breif]*@breif[/email] 打开串口
*/
int OpenDev(char *Dev)
{
int fd = open(Dev, O_RDWR | O_NOCTTY | O_NDELAY); //| O_NOCTTY | O_NDELAY
if (-1 == fd)
{ /*设置数据位数*/
perror("Can't Open Serial Port");
return FALSE;
}
else
return fd;
}
/**
[email=*@breif]*@breif[/email] main()
*/
int main(int argc, char **argv)
{
int fd;
int nwrite;
char *buff="I am sending data!";
char *dev ="/dev/s3c2410_serial0"; //扬创YC2440-S板子的串口名字
fd = OpenDev(dev);
if (fd>0)
set_speed(fd,115200);
else
{
printf("Can't Open Serial Port!\n");
exit(0);
}
if (set_Parity(fd,8,1,'N')== FALSE)
{
printf("Set Parity Error\n");
exit(1);
}
while(1)
{
while((nwrite = write(fd,buff,sizeof(buff)))>0)
{
/*sizeof(buff)=4 buff是指向字符串常量的字符指针*/
printf("\nLen %d\n",nwrite);
//buff[nread+1]='\0';
//printf("\n%s",buff);
}
}
close(fd);
}
|
