測試船體運動正常與否，先設計一個遙控船的運動模型。

1. 通過訂閱鍵盤的遙控資訊。

2. 通過串列埠向stm32向下傳送速度資訊使船完成遙控運動。

//xx
//實現鍵盤控制船運動


#include <ros/ros.h>
#include <geometry_msgs/Twist.h>
#include <iostream>

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



int speed_arr[] = { B38400, B19200, B9600, B4800, B2400, B1200, B300,
B38400, B19200, B9600, B4800, B2400, B1200, B300, };

int set_opt(int fd3,int nSpeed, int nBits, char nEvent, int nStop)   //配置串列埠引數
{   //cout<<lat_1<<endl;
    struct termios newtio,oldtio;   
    /*儲存測試現有串列埠引數設定，在這裡如果串列埠號等出錯，會有相關的出錯資訊*/   
    if  ( tcgetattr( fd3,&oldtio)  !=  0) 
    {    
        perror("SetupSerial 1");  
        printf("tcgetattr( fd3,&oldtio) -> %d\n",tcgetattr( fd3,&oldtio));   
        return -1;   
    }   
    bzero( &newtio, sizeof( newtio ) );   
    /*步驟一，設定字元大小*/   
    newtio.c_cflag  |=  CLOCAL | CREAD;    
    newtio.c_cflag &= ~CSIZE;    
    /*設定停止位*/   
    switch( nBits )   
    {   
    case 7:   
    newtio.c_cflag |= CS7;   
    break;   
    case 8:   
    newtio.c_cflag |= CS8;   
    break;   
    }   
    /*設定奇偶校驗位*/   
    switch( nEvent )   
    {   
    case 'o':  
    case 'O': //奇數   
    newtio.c_cflag |= PARENB;   
    newtio.c_cflag |= PARODD;   
    newtio.c_iflag |= (INPCK | ISTRIP);   
    break;   
    case 'e':  
    case 'E': //偶數   
    newtio.c_iflag |= (INPCK | ISTRIP);   
    newtio.c_cflag |= PARENB;   
    newtio.c_cflag &= ~PARODD;   
    break;  
    case 'n':  
    case 'N':  //無奇偶校驗位   
    newtio.c_cflag &= ~PARENB;   
    break;  
    default:  
    break;  
    }   
    /*設定波特率*/   
    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;   
    }   
    /*設定停止位*/   
    if( nStop == 1 )   
    newtio.c_cflag &=  ~CSTOPB;   
    else if ( nStop == 2 )   
    newtio.c_cflag |=  CSTOPB;   
    /*設定等待時間和最小接收字元*/   
    newtio.c_cc[VTIME]  = 0;   
    newtio.c_cc[VMIN] = 0;   
    /*處理未接收字元*/   
    tcflush(fd3,TCIFLUSH);   
    /*啟用新配置*/   
    if((tcsetattr(fd3,TCSANOW,&newtio))!=0)   
    {   
    perror("com set error");   
    return -1;   
    }   
    printf("set done!\n");   
    return 0;   
} 

/**
*@breif 開啟串列埠
*/
int OpenDev(char *Dev)
{
	int	fd2 = open( Dev, O_RDWR );         //| O_NOCTTY | O_NDELAY
	if (-1 == fd2)
	{ /*設定資料位數*/
		perror("Open Serial Port Fail111111111111111");
		perror("Open Serial Port Fail");
		return -1;
	}
	else
		printf("Open Serial Port Success\n");
	return fd2;

}
int fd1;

void serial_set()    //串列埠函式的開啟與配置
{
	char *dev ="/dev/ttyUSB0";
	fd1 = OpenDev(dev);
	set_opt(fd1, 9600, 8, 'N', 1);
}

unsigned char floatvx[2];
unsigned char floatvw[2];

void long_char(int cmdvel)
{       
	floatvx[0]=cmdvel>>8;
	floatvx[1]=cmdvel;
	//printf("qqqq:%x",floatvx[1]);
}
void long_char1(int cmdvel)
{       
	floatvw[0]=cmdvel>>8;
	floatvw[1]=cmdvel;
	//printf("qqqq:%x",floatvx[1]);
}

unsigned short count_CRC(unsigned char *addr, int num)
{
	unsigned short CRC = 0xFFFF;
	int i;
	while (num--)
	{
		CRC ^= *addr++;
		for (i = 0; i < 8; i++)
		{
		if (CRC & 1)
		{
		CRC >>= 1;
		CRC ^= 0xA001;
		}
		else
		{
		CRC >>= 1;
		}
		}
	}
	return CRC;
}


unsigned char cmd_buff[15];
void set_cmdnum1()
{      
	unsigned short crcs;
	cmd_buff[0]=0xaa;
	cmd_buff[1]=0x55;
	cmd_buff[2]=0x60;
	cmd_buff[3]=floatvx[0];
	cmd_buff[4]=floatvx[1];
	cmd_buff[5]=floatvw[0];
	cmd_buff[6]=floatvw[1];
	crcs=count_CRC(cmd_buff, 7);
	cmd_buff[7]=(crcs&0xff00)>>8;
	cmd_buff[8]=(crcs&0x00ff);
	cmd_buff[9]=0xdd;
	//printf("11111,%x\n",cmd_buff[8]);
	//printf("11111,%x\n",cmd_buff[7]);
}

void write_all(int vx, int vw)   
{
  long_char(vx);
  long_char1(vw);
  set_cmdnum1();

  write(fd1,cmd_buff,10);   //寫入下位機資料
}
float chuan_vx,chuan_vw;
void keyboard_callback(const geometry_msgs::Twist::ConstPtr& cmd )
{
  chuan_vx = 1000*cmd->linear.x;   //0-200
  chuan_vw = 200*cmd->angular.z;   //0-200
  usleep(10000);  //10ms
  std::cout<<"chuan_vx= "<<chuan_vx<<"chuan_vy= "<<chuan_vw<<std::endl;
  write_all(chuan_vx,chuan_vw);
}


int main(int argc, char **argv)
{
   ros::init(argc, argv, "keyboard_chuan");
   serial_set(); 
   ros::NodeHandle n;
   ros::Subscriber sub = n.subscribe("/cmd_vel_mux/input/teleop", 1, keyboard_callback);
    ros::spin();

  return 0;
}
 

需要用到串列埠的規則檔案chuan_usb.rules

SUBSYSTEMS=="usb",ATTRS{idVendor}=="0403" ATTRS{idProduct}=="6001",GROUP="users",MODE="0666"