ubuntu串口怎么測試

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本篇內容主要講解“ubuntu 串口怎么測試”，感興趣的朋友不妨來看看。本文介紹的方法操作簡單快捷，實用性強。下面就讓丸趣 TV 小編來帶大家學習“ubuntu 串口怎么測試”吧!

測試新機器的串口硬件的是否正常，可借用以下程序測試串口是否正常運行，代碼如下：

#include/* 標準輸入輸出定義 */
#include
#include/*Unix 標準函數定義 */
#include/**/
#include/**/
#include/* 文件控制定義 */
#include/*PPSIX 終端控制定義 */
#include/* 錯誤號定義 */
#include
#include

#define FALSE 1
#define TRUE 0

char *recchr= We received:\ 

void print_usage();

int speed_arr[] = {
B921600, B460800, B230400, B115200, B57600, B38400, B19200,
B9600, B4800, B2400, B1200, B300,
};

int name_arr[] = {
921600, 460800, 230400, 115200, 57600, 38400, 19200,
9600, 4800, 2400, 1200, 300,
};

void 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[i]) {
tcflush(fd, TCIOFLUSH);
cfsetispeed(Opt, speed_arr[i]);
cfsetospeed(Opt, speed_arr[i]);
status = tcsetattr(fd, TCSANOW, Opt);
if (status != 0)
perror(tcsetattr fd1 
return;
}
tcflush(fd,TCIOFLUSH);
}

if (i == 12){
printf(\tSorry, please set the correct baud rate!\n\n 
print_usage(stderr, 1);
}
}
/*
*@brief 設置串口數據位，停止位和效驗位 
*@param fd 類型 int 打開的串口文件句柄 *
*@param databits 類型 int 數據位 取值 為 7 或者 8 *
*@param stopbits 類型 int 停止位 取值為 1 或者 2 *
*@param parity 類型 int 效驗類型 取值為 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) /* 設置數據位數 */ {
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); /* 設置為奇效驗 */
options.c_iflag |= INPCK; /* Disnable parity checking */
break;
case e :
case E :
options.c_cflag |= PARENB; /* Enable parity */
options.c_cflag = ~PARODD; /* 轉換為偶效驗 */
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);
}
/* 設置停止位 */
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;

options.c_lflag = ~(ECHO | ICANON);

tcflush(fd,TCIFLUSH); /* Update the options and do it NOW */
if (tcsetattr(fd,TCSANOW, options) != 0) {
perror(SetupSerial 3 
return (FALSE);
}
return (TRUE);
}

/**
*@breif 打開串口 
*/
int OpenDev(char *Dev)
{
int fd = open(Dev, O_RDWR); //| O_NOCTTY | O_NDELAY
if (-1 == fd) {/* 設置數據位數 */
perror(Can t Open Serial Port 
return -1;
} else
return fd;
}


/* The name of this program */
const char * program_name;

/* Prints usage information for this program to STREAM (typically
* stdout or stderr), and exit the program with EXIT_CODE. Does not
* return.
*/

void print_usage (FILE *stream, int exit_code)
{
fprintf(stream, Usage: %s option [ dev...] \n , program_name);
fprintf(stream,
 \t-h --help Display this usage information.\n 
 \t-d --device The device ttyS[0-3] or ttySCMA[0-1]\n 
 \t-b --baudrate Set the baud rate you can select\n 
 \t [230400, 115200, 57600, 38400, 19200, 9600, 4800, 2400, 1200, 300]\n 
 \t-s --string Write the device data\n 
exit(exit_code);
}



/*
*@breif main()
*/
int main(int argc, char *argv[])
{
int fd, next_option, havearg = 0;
char *device;
int i=0,j=0;
int nread; /* Read the counts of data */
char buff[512]; /* Recvice data buffer */
pid_t pid;
char *xmit = 1234567890 /* Default send data */
int speed ;
const char *const short_options = hd:s:b: 

const struct option long_options[] = {
{help , 0, NULL, h},
{device , 1, NULL, d},
{string , 1, NULL, s},
{baudrate , 1, NULL, b},
{NULL, 0, NULL, 0}
};

program_name = argv[0];

do {
next_option = getopt_long (argc, argv, short_options, long_options, NULL);
switch (next_option) {
case h :
print_usage (stdout, 0);
case d :
device = optarg;
havearg = 1;
break;
case b :
speed = atoi(optarg);
break;

case s :
xmit = optarg;
havearg = 1;
break;
case -1:
if (havearg) break;
case ? :
print_usage (stderr, 1);
default:
abort ();
}
}while(next_option != -1);

sleep(1);
fd = OpenDev(device);

if (fd 0) {
set_speed(fd, speed);
} else {
fprintf(stderr, Error opening %s: %s\n , device, strerror(errno));
exit(1);
}

if (set_Parity(fd,8,1, N)== FALSE) {
fprintf(stderr, Set Parity Error\n 
close(fd);
exit(1);
}

pid = fork();

if (pid 0) {
fprintf(stderr, Error in fork!\n 
} else if (pid == 0){
while(1) {
printf(%s SEND: %s id %d\n ,device, xmit,i);
write(fd, xmit, strlen(xmit));
sleep(1);
i++;
}
exit(0);
} else {
while(1) {
nread = read(fd, buff, sizeof(buff));
if (nread 0) {
buff[nread] = \0 
printf(%s RECV %d total\n , device, nread);
printf(%s RECV: %s\n , device, buff);
}
}
}
close(fd);
exit(0);
}