Linux串口测试例程
嵌入式Linux开发过程中，进行Linux串口测试，需要针对串口进行回环测试
或者指定串口接收一定的数据
或者指定串口发送一定的数据
使用该测试用例很快验证硬件串口的稳定性和正确性。
使用代码连接如下
Linux串口测试例程，进行Linux串口测试，需要针对串口进行回环测试；或者指定串口接收一定的数据-嵌入式文档类资源-CSDN文库
这里提供一个很好的测试用例，具体使用
#收发数据测试：
./uart_app /dev/ttyS1 -b 115200 -rw 123asd -asc -l
#发数据测试：
./uart_app /dev/ttyS1 -b 115200 -w 123asd -asc -l
#收数据测试：
./uart_app /dev/ttyS1 -b 115200 -r -asc -l
#其他用法参考如下：其他用法参考如下help说明：
后缀说明如下
printf(" -asc: read to ascii\n");
printf(" -b: set buadrate + [bps]\n");
printf(" [bps] 300 600 1200 2400 4800 9600 19200 38400 57600 115200\n");
printf(" -n: write end add enter\n");
printf(" -l: loop\n");
printf(" -ms: write xx ms interval\n");
printf(" -r: read only\n");
printf(" -w: write only + [context]\n");
printf(" -rw: read write + [context]\n");
printf(" -h: for help\n");
printf("==================================================\n");makefile
#!/bin/bash
CC=arm-linux-gnueabihf-gcc
${CC} uart_app.c -o uart_app
源码如下
#include
#include
#include
#include
#include
#include
#include
#include
#include
int set_opt(int fd,int nSpeed, int nBits, char nEvent, int nStop)
{
struct termios newtio,oldtio;
if ( tcgetattr( fd,&oldtio) != 0)
{
perror("SetupSerial 1");
return -1;
}
bzero( &newtio, sizeof( newtio ) );
newtio.c_cflag |= CLOCAL | CREAD;
newtio.c_cflag &= ~CSIZE;
switch( nBits )
{
case 7:
newtio.c_cflag |= CS7;
break;
case 8:
newtio.c_cflag |= CS8;
break;
}
switch( nEvent )
{
case 'O': //奇校验
newtio.c_cflag |= PARENB;
newtio.c_cflag |= PARODD;
newtio.c_iflag |= (INPCK | ISTRIP);
break;
case 'E': //偶校验
newtio.c_iflag |= (INPCK | ISTRIP);
newtio.c_cflag |= PARENB;
newtio.c_cflag &= ~PARODD;
break;
case 'N': //无校验
newtio.c_cflag &= ~PARENB;
break;
}
switch( nSpeed )
{
case 300:
cfsetispeed(&newtio, B300);
cfsetospeed(&newtio, B300);
break;
case 600:
cfsetispeed(&newtio, B600);
cfsetospeed(&newtio, B600);
break;
case 1200:
cfsetispeed(&newtio, B1200);
cfsetospeed(&newtio, B1200);
break;
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 19200:
cfsetispeed(&newtio, B19200);
cfsetospeed(&newtio, B19200);
break;
case 38400:
cfsetispeed(&newtio, B38400);
cfsetospeed(&newtio, B38400);
break;
case 57600:
cfsetispeed(&newtio, B57600);
cfsetospeed(&newtio, B57600);
break;
case 115200:
cfsetispeed(&newtio, B115200);
cfsetospeed(&newtio, B115200);
break;
default:
printf("sorry! [%d bps] is not support ,Set default 9600bps now!\n",nSpeed);
cfsetispeed(&newtio, B9600);
cfsetospeed(&newtio, B9600);
break;
}
if( nStop == 1 )
{
newtio.c_cflag &= ~CSTOPB;
}
else if ( nStop == 2 )
{
newtio.c_cflag |= CSTOPB;
}
newtio.c_cc[VTIME] = 0;
newtio.c_cc[VMIN] = 0;
tcflush(fd,TCIFLUSH);
if((tcsetattr(fd,TCSANOW,&newtio))!=0)
{
perror("com set error");
return -1;
}
printf("set done!\n");
return 0;
}
int open_port(int fd,char *dev)
{
//char *dev[]={"/dev/ttyO1","/dev/ttyO2","/dev/ttyO3"};
long vdisable;
fd = open( dev, O_RDWR|O_NOCTTY); //open("/dev/tttyS0",O_RDWR | O_NOCTTY); //O_NDELAY
if (-1 == fd)
{
perror("Can't Open Serial Port");
return(-1);
}
else
{
printf("open %s ok\n",dev);
}
if(fcntl(fd, F_SETFL, 0)<0)
{
printf("fcntl failed!\n");
}
else
{
printf("fcntl=%d\n",fcntl(fd, F_SETFL,0));
}
if(isatty(STDIN_FILENO)==0)
{
printf("standard input is not a terminal device\n");
}
else
{
printf("isatty success!\n");
}
printf("fd-open=%d\n",fd);
return fd;
}
void msdelay(int val){
while(val--)usleep(1000);
}
//#define DEBUG_STR "ttySC1 554433"
#define Mode_W 1
#define Mode_R 2
#define Mode_RW 3
#define Version "V1.1"
//const char *default_str = "hello serial test";
int main(int argc ,char **argv)
{
int fd;
int nread,i;
char buff[1024];
int nwrite;
int setmode;
char *wchr;
int format = 0;
int boudrate = 9600;
int enter = 0;
int loop = 0;
int intervalMS = 1000;
printf("\n==================================================\n");
//printf("argc = %d\n",argc);
if((argc < 2) || (!strcmp(argv[1],"-h"))||(!strcmp(argv[1],"help"))){
printf("Version %s\n",Version);
printf("[device] [option1] [option2] ....[optionN]\n");
printf("option:\n");
printf(" -asc: read to ascii\n");
printf(" -b: set buadrate + [bps]\n");
printf(" [bps] 300 600 1200 2400 4800 9600 19200 38400 57600 115200\n");
printf(" -n: write end add enter\n");
printf(" -l: loop\n");
printf(" -ms: write xx ms interval\n");
printf(" -r: read only\n");
printf(" -w: write only + [context]\n");
printf(" -rw: read write + [context]\n");
printf(" -h: for help\n");
printf("==================================================\n");
return 1;
}
printf("Device [%s] \n",argv[1]);
//------------------------------------------------------------
for(i = 1; i < argc; i ++){
if(!strcmp(argv[i],"-asc")){
format = 1;
printf("format ascii\n");
}else if(!strcmp(argv[i],"-hex")){
format = 0;
printf("format hex\n");
}
else if(!strcmp(argv[i],"-b")){
i++;
boudrate = atoi(argv[i]);
}
else if(!strcmp(argv[i],"-n")){
enter = 1;
printf("enter true\n");
}
else if(!strcmp(argv[i],"-l")){
loop = 1;
printf("loop true\n");
}
else if(!strcmp(argv[i],"-ms")){
i++;
intervalMS = atoi(argv[i]);
}
else if(!strcmp(argv[i],"-w")){
i++;
setmode = Mode_W;
wchr = (char*)argv[i];
printf("write only w:%s\n",wchr);
}
else if(!strcmp(argv[i],"-r")){
printf("read only\n");
setmode = Mode_R;
}
else if(!strcmp(argv[i],"-rw")){
i++;
setmode = Mode_RW;
wchr = (char*)argv[i];
printf("read write w:%s\n",wchr);
}
}
printf("boudrate = %d\n",boudrate);
printf("interval : %d ms\n",intervalMS);
printf("==================================================\n");
if((fd=open_port(fd,argv[1]))<0){
perror("open_port error");
return;
}
if((i=set_opt(fd,boudrate,8,'N',1))<0){
perror("set_opt error");
return;
}
while(loop){
switch(setmode){
case Mode_W:
nwrite = sprintf(buff,"%s",wchr);
if(enter){
buff[nwrite++] = 0x0d;
buff[nwrite++] = 0x0a;
}
write(fd,buff,nwrite);
printf("%s write :%s\n",argv[1],wchr);
break;
case Mode_R:
nread=read(fd,buff,sizeof(buff));
if(nread>0){
printf("\n%s read=%d : ",argv[1],nread);
if(format==0){
for(i = 0; i < nread;i++){
printf("%02x ",buff[i]);
}
printf("\n");
}else{
buff[nread] = '\0';
printf("%s\n",buff);
}
}
break;
case Mode_RW:
nwrite = sprintf(buff,"%s",wchr);
if(enter){
buff[nwrite++] = 0x0d;
buff[nwrite++] = 0x0a;
}
write(fd,buff,nwrite);
printf("%s write :%s\n",argv[1],wchr);
//sleep(1);
nread=read(fd,buff,sizeof(buff));
if(nread>0){
printf("\n%s read=%d : ",argv[1],nread);
if(format==0){
for(i = 0; i < nread;i++){
printf("%02x ",buff[i]);
}
printf("\n");
}else{
buff[nread] = '\0';
printf("%s\n",buff);
}
}
break;
}
//sleep(1);
msdelay(intervalMS);
}
close(fd);
return;
}
添加个代码封面
