简述

有很多的小伙伴说用Linux树莓派来读取JY61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、JY61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、JY61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JY61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

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、JY61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

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