UART 接口测试「建议收藏」

minicom -s

stty -F /dev/ttyS0 -a  				查看串口参数
stty -F /dev/ttyS0 ispeed 115200 ospeed 115200 cs8 设置串口参数
cat /dev/ttyS0 						打印串口数据
echo “hello word” >  /dev/ttyS0   	向串口发送数据

microcom /dev/ttyS0   ctrl+x打断

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <termios.h>
#include <errno.h>
typedef  unsigned int uint32_t ; 
static speed_t speed_arr[] = {B230400, B115200, B57600, B38400, B19200, B9600, B4800, B2400, B1200, B600, B300};
static int      name_arr[] = { 230400,  115200,  57600,  38400,  19200,  9600,  4800,  2400,  1200, 600,  300};
static int uart_fd;
/**
*@brief  设置串口通信速率
*@param  fd     类型 int  打开串口的文件句柄
*@param  speed  类型 int  串口速度
*@return  void
*/
static void set_speed(int fd, int speed){
uint32_t  i; 
struct termios opt;
tcgetattr(fd, &opt); 
tcflush(fd, TCIOFLUSH);     
cfmakeraw(&opt);
#if 1
for(i= 0; i < sizeof(speed_arr)/sizeof(speed_t); i++) { 
if  (speed == name_arr[i]) {     
printf("serial speed=%d ", speed);
cfsetispeed(&opt, speed_arr[i]);  
cfsetospeed(&opt, speed_arr[i]);   
}    
}
#else
cfsetispeed(&opt, B115200);
cfsetospeed(&opt, B115200);
#endif
if (tcsetattr(fd, TCSANOW, &opt) == -1) {
printf("tcsetattr(): %s", strerror(errno));
return;
}
tcflush(fd,TCIOFLUSH);   
}
/**
*@brief   设置串口数据位，停止位和效验位
*@param  fd     类型  int  打开的串口文件句柄
*@param  databits 类型  int 数据位   取值 为 7 或者8
*@param  stopbits 类型  int 停止位   取值为 1 或者2
*@param  parity  类型  int  效验类型 取值为N,E,O,,S
*/
static int set_parity(int fd, int speed, int databits,char *parity,int stopbits)
{ 
set_speed(fd,speed);
struct termios options; 
if  ( tcgetattr( fd,&options)  !=  0) { 
perror("SetupSerial 1");     
return -1;  
}
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 -1;  
}
printf("databits=%d ",databits);
switch (parity[0]) 
{   
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 -1;  
}  
printf("parity=%c ",parity[0]);
/* 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 -1; 
} 
printf("stopbits=%d\n",stopbits);
/* Set input parity option */ 
if (parity[0] != 'n')   
options.c_iflag |= INPCK; 
tcflush(fd,TCIFLUSH);
//options.c_cc[VTIME] = 150; /* 设置超时15 seconds*/   
//options.c_cc[VMIN] = 0; /* Update the options and do it NOW */
if (tcsetattr(fd,TCSANOW,&options) != 0)   
{ 
perror("SetupSerial 3");   
return -1;  
} 
return 0;  
}
static void uart_init(char * pserial_dev, int speed, int databits, char *parity, int stopbits)
{
int ret = 0;
printf("dev name is: %s \r\n", pserial_dev);
uart_fd = open(pserial_dev, O_RDWR | O_NOCTTY);
if (uart_fd < 0) {
printf("open(): %s\r\n", strerror(errno));
exit(1);
}
//set_parity(uart_fd, speed, 8, 'O', 1);
ret = set_parity(uart_fd, speed, databits, parity, stopbits);
if(ret) {
printf("\noperating error!\r\n");
close(uart_fd);
exit(1);
}
}
static int test_send(char * file_name)
{
char buf[1024];
int  fd, ret, tmp;
fd = open(file_name, O_RDONLY);
if(fd < 0) {
printf("open %s faild!\n",file_name);
return -1;
}
while(1) {
ret = 0;
tmp = 0;
ret = read(fd, buf, sizeof(buf)); 
if(ret <= 0) {
//printf("read error!\n");
break;
}
do {
tmp += write(uart_fd, buf+tmp, ret-tmp);
} while(tmp != ret);
}
close(fd);
return 0;
}
static int test_receive(char * file_name)
{
char buf[1024];
int  fd, ret, tmp;
fd = open(file_name,O_WRONLY|O_TRUNC|O_CREAT,0666);
if(fd < 0) {
printf("open %s faild!\n",file_name);
return -1;
}
while(1) {
ret = 0;
tmp = 0;
ret = read(uart_fd, buf, sizeof(buf)); 
if(ret <= 0) {
printf("read error!\n");
break;
}
do {
tmp += write(fd, buf+tmp, ret-tmp);
} while(tmp != ret);
}
close(fd);
return 0;
}
void print_info(void)
{
int i;
printf("\n./test_uart /dev/ttyX speed databits parity stopbits file-name transport\n\n");
printf("	/dev/ttyX	/dev/ttySn or /dev/ttyUSBn\n");
printf("	speed		");
for(i=0;name_arr[i];i++) {
printf("%d ",name_arr[i]);
}
printf("\n");
printf("	databits	8	7\n");
printf("	parity		n	o	e\n");
printf("	stopbits	1	2\n");
printf("	file-name	./1.log\n");
printf("	transport	send	receive\n");	
printf("\n	E.g# ./test_uart /dev/ttyS1 115200 8 n 1 1.log receive\n\n");
}
int main(int argc,char *argv[])
{
char * parity;
int speed, databits, stopbits;
if(argc != 8) {
print_info();
exit(1);
}
parity	 = argv[4];
speed    = atoi(argv[2]);
databits = atoi(argv[3]);
stopbits = atoi(argv[5]);
uart_init(argv[1],speed,databits,parity,stopbits);
if(!strcmp(argv[7],"send")) {
test_send(argv[6]);
} else if(!strcmp(argv[7],"receive")) {
test_receive(argv[6]);
}else{
print_info();
}
close(uart_fd);
return 0;
}

	将串口ttyS1接受到的数据保存在1.log文件里
./uart_text /dev/ttyS1 115200 8 n 1 1.log receive

	将文件1.log内容发送到串口ttyS1上
./uart_text /dev/ttyS1 115200 8 n 1 1.log send