## 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
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
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
```cpp
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
```cpp
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
```cpp
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
```cpp
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
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