用Linux树莓派来读取JY901的串口数据

简述

有很多的小伙伴说用Linux树莓派来读取JY901的串口数据不知道怎么操作。今天我和大家分享下我是从三个方面分享的。1、JY901和树莓派的连接方式及VNC的使用；2、下载到树莓派的程序是如何编写的；3、结果展示

1、JY901和树莓派的连接方式及VNC的使用

1.1给树莓派 连接电源和网线

1.2连接上树莓派和JY901的模块

注意六合一串口模块拨码1为ON、拨码2为OFF，开关S1置other ；

JY61模块跟六合一串口模块引脚需要一一对应

VCC对3V3

RX对TX

TX对RX

GND对GND

1.3 下载VNC

前往官网下载VNC，官网地址：https://www.realvnc.com/en/

软件安装步骤参考官网安装步骤，在下载的文件夹VNC Viewer中打开vncviewer.exe
在这里输入树莓派的ip地址（可通过ip搜索器搜索，选择ip名为raspberrypi的ip地址）

（## IP搜索器可自行百度下载）

1.4 登陆VNC

输入账号密码， 账号：**** 密码：**** 账号密码参考自己的树莓派资料

1.5 把代码拷贝到VNC

1.6 拷贝文件位置

1.7 终端运行程序

注：右键可打开终端

终端中的Desktop文件夹即为桌面

编辑：gcc Uart61Demo.cpp -o Uart61Demo

运行：./ Uart61Demo

2 程序编写

程序一共包括串口打开部分、串口设置、JY901数据接收与处理、主程序的运行。

2.1 串口打开

int uart_open(int fd,const char *pathname)
{
    fd = open(pathname, O_RDWR|O_NOCTTY); 
    if (-1 == fd)
    { 
        perror("Can't Open Serial Port"); 
		return(-1); 
	} 
    else
		printf("open %s success!\n",pathname);
    if(isatty(STDIN_FILENO)==0) 
		printf("standard input is not a terminal device\n"); 
    else 
		printf("isatty success!\n"); 
    return fd; 
}

2.2 串口设置

int uart_set(int fd,int nSpeed, int nBits, char nEvent, int nStop)
{
     struct termios newtio,oldtio; 
     if  ( tcgetattr( fd,&oldtio)  !=  0) {  
      perror("SetupSerial 1");
	  printf("tcgetattr( fd,&oldtio) -> %d\n",tcgetattr( fd,&oldtio)); 
      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':
     case 'O': 
      newtio.c_cflag |= PARENB; 
      newtio.c_cflag |= PARODD; 
      newtio.c_iflag |= (INPCK | ISTRIP); 
      break; 
     case 'e':
     case 'E': 
      newtio.c_iflag |= (INPCK | ISTRIP); 
      newtio.c_cflag |= PARENB; 
      newtio.c_cflag &= ~PARODD; 
      break;
     case 'n':
     case 'N': 
      newtio.c_cflag &= ~PARENB; 
      break;
     default:
      break;
     } 

     /*设置波特率*/ 

switch( nSpeed ) 
     { 
     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 115200: 
      cfsetispeed(&newtio, B115200); 
      cfsetospeed(&newtio, B115200); 
      break; 
     case 460800: 
      cfsetispeed(&newtio, B460800); 
      cfsetospeed(&newtio, B460800); 
      break; 
     default: 
      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; 
}

2.3 JY61串口数据的接受和处理

void ParseData(char chr)
{
		static char chrBuf[100];
		static unsigned char chrCnt=0;
		signed short sData[4];
		unsigned char i;
		
		time_t now;
		chrBuf[chrCnt++]=chr;
		if (chrCnt<11) return;
		
		if ((chrBuf[0]!=0x55)||((chrBuf[1]&0x50)!=0x50)) {printf("Error:%x %x\r\n",chrBuf[0],chrBuf[1]);memcpy(&chrBuf[0],&chrBuf[1],10);chrCnt--;return;}
		
		memcpy(&sData[0],&chrBuf[2],8);
		switch(chrBuf[1])
		{
				case 0x51:
					for (i=0;i<3;i++) a[i] = (float)sData[i]/32768.0*16.0;
					time(&now);
					printf("\r\nT:%s a:%6.3f %6.3f %6.3f ",asctime(localtime(&now)),a[0],a[1],a[2]);
					
					break;
				case 0x52:
					for (i=0;i<3;i++) w[i] = (float)sData[i]/32768.0*2000.0;
					printf("w:%7.3f %7.3f %7.3f ",w[0],w[1],w[2]);					
					break;
				case 0x53:
					for (i=0;i<3;i++) Angle[i] = (float)sData[i]/32768.0*180.0;
					printf("A:%7.3f %7.3f %7.3f ",Angle[0],Angle[1],Angle[2]);
					break;
				case 0x54:
					for (i=0;i<3;i++) h[i] = (float)sData[i];
					printf("h:%4.0f %4.0f %4.0f ",h[0],h[1],h[2]);
					
					break;
		}		
		chrCnt=0;		
}

2.4 主函数

int main(void)
{
    char r_buf[1024];
    bzero(r_buf,1024);

    fd = uart_open(fd,"/dev/ttyUSB0");/*串口号/dev/ttySn,USB口号/dev/ttyUSBn */ 
    if(fd == -1)
    {
        fprintf(stderr,"uart_open error\n");
        exit(EXIT_FAILURE);
    }

    if(uart_set(fd,BAUD,8,'N',1) == -1)
    {
        fprintf(stderr,"uart set failed!\n");
        exit(EXIT_FAILURE);
    }

	FILE *fp;
	fp = fopen("Record.txt","w");
    while(1)
    {
        ret = recv_data(fd,r_buf,44);
        if(ret == -1)
        {
            fprintf(stderr,"uart read failed!\n");
            exit(EXIT_FAILURE);
        }
		for (int i=0;i<ret;i++) {fprintf(fp,"%2X ",r_buf[i]);ParseData(r_buf[i]);}
        usleep(1000);
    }

    ret = uart_close(fd);
    if(ret == -1)
    {
        fprintf(stderr,"uart_close error\n");
        exit(EXIT_FAILURE);
    }

    exit(EXIT_SUCCESS);
}

3 结果展示

最后给大家分享下代码
链接：https://pan.baidu.com/s/1FP1rOGg0Tzrk15lltxa1AA