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标题: AIO-3568 测试RS232串口，上位机到开发板正常，开发板到上位机乱数 [打印本页]

作者: langtuteng312 时间: 2022-8-22 11:25
标题: AIO-3568 测试RS232串口，上位机到开发板正常，开发板到上位机乱数
新入手的开发板：AIO-3568J
测试RS232串口通信：

1：开发板默认系统为Android，在官方网站Wiki.t 下载Ubuntu 固件刷机版本18.04
AIO-3568J-UBUNTU18.04-GPT-20220222-1626.img

2: 开发板自带两路RS232
对应串口号 ttyS3 ttyS4

3: 上位机使用串口助手发送字符串，开发板使用 echo 指令发送和接收字符
测试发送： echo "firefly RS232 test..." > /dev/ttyS3 上位机收到的是乱码
测试接收：cat /dev/ttyS3 然后上位机发送“firefly ” 开发板能正常收到4：上位机发送接收十六进制数，开发板使用自行编译的串口测试代码以下为测试程序代码=======================================================#include    <stdio.h> #include    <stdlib.h>#include    <string.h>#include    <unistd.h>#include    <sys/types.h>#include    <sys/stat.h>  #include    <fcntl.h>  #include    <termios.h>#include    <errno.h> #include    <pthread.h> #include    <sys/ioctl.h> #define FALSE 1#define TRUE 0//#include <stdio.h>//#include <stdlib.h>//malloc//#include <sys/types.h>//open//#include <sys/stat.h>//#include <fcntl.h>//#include <unistd.h>//close/read#include <linux/input.h>//struct input_event//EV_ABS...#include <strings.h>//bzero//#include <sys/ioctl.h>//#include <errno.h>int speed_arr[] = {B115200, B57600, B38400, B19200, B9600, B4800,  B2400, B1200};int name_arr[] = {115200, 57600, 38400,  19200,  9600,  4800,  2400, 1200};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) { tcflush(fd, TCIOFLUSH); cfsetispeed(&Opt, speed_arr); cfsetospeed(&Opt, speed_arr); status = tcsetattr(fd, TCSANOW, &Opt); if (status != 0) perror("tcsetattr fd1"); return; } tcflush(fd,TCIOFLUSH); }}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) { 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;    options.c_iflag &= ~INPCK;    break; case 'o': case 'O': options.c_cflag |= (PARODD | PARENB); options.c_iflag |= INPCK;            break; case 'e': case 'E': options.c_cflag |= PARENB;      options.c_cflag &= ~PARODD; options.c_iflag |= INPCK;      break; case 'S': case 's':    options.c_cflag &= ~PARENB; options.c_cflag &= ~CSTOPB; break; default: fprintf(stderr,"Unsupported parity\n"); return (FALSE); } 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); } options.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON); options.c_oflag &= ~OPOST; options.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN); /* Set input parity option */ if (parity != 'n') options.c_iflag |= INPCK; options.c_cc[VTIME] = 150; // 15 seconds options.c_cc[VMIN] = 0; tcflush(fd,TCIFLUSH); /* Update the options and do it NOW */ if (tcsetattr(fd,TCSANOW,&options) != 0) { perror("SetupSerial 3"); return (FALSE); } return (TRUE);}void receivethread_1(void){ int nread,i=0; char buff_tx_1[20]; //TX：55 AA 01 02 buff_tx_1[0] = 0x55; buff_tx_1[1] = 0xAA; buff_tx_1[2] = 0x01; buff_tx_1[3] = 0x02; char buff_1[512]; while(1) { write(fd_1, buff_tx_1, 4);    usleep(2000); if((nread = read(fd_1,buff_1,100))>0) //接收数据 { printf("[RECEIVE] Len is %d,content is :\n[Hex]",nread); //buff[nread]='\0'; //printf("%s\n",buff); for (i = 0;i < nread; i++) { printf("%02x ", buff_1); } printf("\n"); } usleep(1000); } return;}int main(int argc, char *argv[]){ pthread_t receive_1; char port_1[20] = "/dev/ttyS3"; fd_1 = open(port_1, O_RDWR); if (fd_1 < 0) { printf("open device %s faild\n",port_1); exit(0); } set_speed(fd_1,115200); set_Parity(fd_1,8,1,'N'); pthread_create(&receive_1,NULL,(void*)receivethread_1,NULL); while(1) { printf("Please Input string to send to %s\n:",port_1); scanf("%s", str); if(strlen(str) > 0) { write(fd_1, str, strlen(str));    write(fd_1, "\n", strlen("\n")); usleep(200*1000); } } close(fd_1); exit(0);}===========================================================上位机到开发板正常，开发板到上位机乱数当设置为开发板到上位机发一个字节，55  上位机接收显示正确 55当设置为开发板到上位机发两个字节，55 AA  上位机接收显示错误为：  55 15使用示波器查看波形，发现位数不全，发送一个字节，为1个起始位，8个数据位，1个停止位，共10 位，而发送两个字节时，数波形，不够20

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2022-8-22 10:58 上传

rs232.txt

2022-8-22 11:24 上传

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作者: langtuteng312 时间: 2022-8-22 11:42
自行编译的串口测试代码
以下为测试程序代码
=======================================================

#include    <stdio.h>
#include    <stdlib.h>
#include    <string.h>
#include    <unistd.h>
#include    <sys/types.h>
#include    <sys/stat.h>
#include    <fcntl.h>
#include    <termios.h>
#include    <errno.h>
#include    <pthread.h>
#include    <sys/ioctl.h>

#define FALSE 1
#define TRUE 0

//#include <stdio.h>
//#include <stdlib.h>//malloc
//#include <sys/types.h>//open
//#include <sys/stat.h>
//#include <fcntl.h>
//#include <unistd.h>//close/read
#include <linux/input.h>//struct input_event//EV_ABS...
#include <strings.h>//bzero

//#include <sys/ioctl.h>
//#include <errno.h>

int speed_arr[] = {B115200, B57600, B38400, B19200, B9600, B4800,  B2400, B1200};
int name_arr[] = {115200, 57600, 38400,  19200,  9600,  4800,  2400, 1200};

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);
}
}

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)
{
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;
options.c_iflag &= ~INPCK;
break;
case 'o':
case 'O':
options.c_cflag |= (PARODD | PARENB);
options.c_iflag |= INPCK;
break;
case 'e':
case 'E':
options.c_cflag |= PARENB;
options.c_cflag &= ~PARODD;
options.c_iflag |= INPCK;
break;
case 'S':
case 's':
options.c_cflag &= ~PARENB;
options.c_cflag &= ~CSTOPB;
break;
default:
fprintf(stderr,"Unsupported parity\n");
return (FALSE);
}
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);
}

options.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
options.c_oflag &= ~OPOST;
options.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);

/* Set input parity option */

if (parity != 'n')
options.c_iflag |= INPCK;
options.c_cc[VTIME] = 150; // 15 seconds
options.c_cc[VMIN] = 0;

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

void receivethread_1(void)
{
int nread,i=0;

char buff_tx_1[20];

//TX：55 AA 01 02
buff_tx_1[0] = 0x55;
buff_tx_1[1] = 0xAA;
buff_tx_1[2] = 0x01;
buff_tx_1[3] = 0x02;

char buff_1[512];

while(1)
{

write(fd_1, buff_tx_1, 4);
usleep(2000);

if((nread = read(fd_1,buff_1,100))>0) //接收数据
{
printf("[RECEIVE] Len is %d,content is :\n[Hex]",nread);

//buff[nread]='\0';
//printf("%s\n",buff);

for (i = 0;i < nread; i++)
{
printf("%02x ", buff_1[i]);
}
printf("\n");

}

usleep(1000);
}

return;
}

int main(int argc, char *argv[])
{

pthread_t receive_1;

char port_1[20] = "/dev/ttyS3";

fd_1 = open(port_1, O_RDWR);
if (fd_1 < 0)
{
printf("open device %s faild\n",port_1);
exit(0);
}

set_speed(fd_1,115200);
set_Parity(fd_1,8,1,'N');

pthread_create(&receive_1,NULL,(void*)receivethread_1,NULL);

while(1)
{
printf("Please Input string to send to %s\n:",port_1);
scanf("%s", str);
if(strlen(str) > 0)
{
write(fd_1, str, strlen(str));
write(fd_1, "\n", strlen("\n"));
usleep(200*1000);
}
}

close(fd_1);

exit(0);
}
作者: Liuth 时间: 2022-8-22 16:56
我测试发送： echo "firefly RS232 test..." > /dev/ttyS3，上位机收到的是正常数据，没有问题
不过我的上位机是linux，没用串口助手，不过应该不影响
你这种情况可能是线路接触不良或者硬件故障
作者: langtuteng312 时间: 2022-8-27 21:32

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RS232端子定义

2022-8-27 21:29 上传

串口测试，RS232接线是按照  GND、TX、RX ，如图下部红框，而实际上绿色端子的定义是上部红框内的，TX、GBD、RX

重新接线后，测试正常

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