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标题:
贴一个串口测试程序
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作者:
armeasy
时间:
2016-11-4 08:40
标题:
贴一个串口测试程序
#include <termios.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
struct termios newtio;
struct termios oldtio;
int setUartOpt(int fd, int nSpeed, int nBits, char nEvent, int nStop)
{
if(tcgetattr(fd,&oldtio) != 0)
{
printf("SetupSerial\n");
return -1;
}
bzero(&newtio,sizeof(newtio));
newtio.c_cflag |= CLOCAL |CREAD;
newtio.c_cflag &= ~CSIZE;
/***********数据位选择****************/
switch(nBits)
{
case 7:
newtio.c_cflag |= CS7;
break;
case 8:
newtio.c_cflag |= CS8;
break;
}
/***********校验位选择****************/
switch(nEvent)
{
case 'O':
newtio.c_cflag |= PARENB;
newtio.c_cflag |= PARODD;
newtio.c_iflag |= (INPCK | ISTRIP);
break;
case 'E':
newtio.c_iflag |= (INPCK |ISTRIP);
newtio.c_cflag |= PARENB;
newtio.c_cflag &= ~PARODD;
break;
case 'N':
newtio.c_cflag &= ~PARENB;
break;
}
/***********波特率选择****************/
switch(nSpeed)
{
case 2400:
cfsetispeed(&newtio,B2400);
cfsetospeed(&newtio,B2400);
break;
case 4800:
cfsetispeed(&newtio,B4800);
cfsetospeed(&newtio,B4800);
break;
case 9600:
cfsetispeed(&newtio,B9600);
cfsetospeed(&newtio,B9600);
break;
case 57600:
cfsetispeed(&newtio,B57600);
cfsetospeed(&newtio,B57600);
break;
case 115200:
cfsetispeed(&newtio,B115200);
cfsetospeed(&newtio,B115200);
break;
case 460800:
cfsetispeed(&newtio,B460800);
cfsetospeed(&newtio,B460800);
break;
default:
cfsetispeed(&newtio,B9600);
cfsetospeed(&newtio,B9600);
break;
}
/***********停止位选择****************/
if(nStop == 1) {
newtio.c_cflag &= ~CSTOPB;
}
else if(nStop ==2) {
newtio.c_cflag |= CSTOPB;
}
//newtio.c_cc[VTIME] = 1;
//newtio.c_cc[VMIN] = FRAME_MAXSIZE; //阻塞条件下有效
tcflush(fd,TCIFLUSH);
if((tcsetattr(fd,TCSANOW,&newtio)) != 0)
{
printf("com set error\n");
return -1;
}
printf("set done!\n");
return 0;
}
int main(int argc, char* argv[])
{
if(argc < 2)
{
printf("parameter error\n");
}
int m_nDevUart = open(argv[1], O_RDWR | O_NOCTTY);
if(m_nDevUart < 0)
{
printf("uart initalize fail.\n");
return -1;
}
printf("m_nDevUart = %d\n", m_nDevUart);
setUartOpt(m_nDevUart, 115200, 8, 'N', 1);
fd_set rfds;
unsigned char buf[256];
while(1)
{
bzero(buf, 256);
int n = read(m_nDevUart, buf, 256);
printf("read buf %d data %s\n", n,buf);
write(m_nDevUart, "abcdefgh", 8);
sleep(1);
}
}
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