Jetbrains全系列IDE使用 1年只要46元 售后保障 童叟无欺
UART 接口测试
一、系统下串口测试
1.minicom
minicom -s
组合键 Ctrl+a 进入设置状态
按z打开帮助菜单，或者直接输入菜单对应的字母即可
S键：发送文件到目标系统中
W键：自动卷屏。当显示的内容超过一行之後，自动将後面的内容换行
C键：清除屏幕的显示内容
B键：浏览minicom的历史显示
X键：退出minicom
2.stty命令
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
3.microcom
microcom /dev/ttyS0 ctrl+x打断
二、串口UART测试程序
带传参波特率、奇偶校验、停止位、数据位
#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;
}
1.测试接受
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
2.测试发送
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
版权声明：本文内容由互联网用户自发贡献，该文观点仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 举报，一经查实，本站将立刻删除。
发布者：全栈程序员-站长，转载请注明出处：https://javaforall.net/193848.html原文链接：https://javaforall.net
