rs485多路串口通信。。

问题描述

rs485多路串口通信。。 1C

DM368开发板和一个单片机板通过RS485串口通信。
DM368开发板同时发送一组数据给单片机板和云台比如：aa 55 05 00 33 44 14 90 00
单片机板接收后返回另一组数据给DM368开发板比如：AA 55 16 00 11 22 33 44 00 00 10 00 32 47 42 47 D2 01

这个程序改怎么写？
PS: RS485为半双工只能读或者只能写。

附上：我已写程序。哪里不对？

#include

#define GIO_RS485_CTRL 51
#define URAT0_RXD 19
#define URAT0_TXD 18
#define RS485_DEVICE_NAME ""/dev/ttyS1""

typedef struct {
int pin_idx;
int pin_dir;
int pin_sta;
} davinci_gio_arg;

typedef enum {
AT91PIO_DIR_OUT = 0
AT91PIO_DIR_INP
} davinci_gio_dir;

#define IOCTL_PIO_SETDIR _IOW('Q' 0x01 int) //Set pio direct
#define IOCTL_PIO_GETDIR _IOR('Q' 0x02 int) //Get pio direct
#define IOCTL_PIO_SETSTA _IOW('Q' 0x03 int) //Set pio status
#define IOCTL_PIO_GETSTA _IOR('Q' 0x04 int) //Get pio status
//IOCTL for FIQ
#define IOCTL_FIQ_SETIRQ _IOW('Q' 0x05 int) //Set fiq handle

#define LEN 16
#define DEV_PIO_LED ""/dev/pio""
#define PIO_NUM 47

int set_com_config(int fdint baud_rateint data_bitschar parityint stop_bits){
struct termios new_cfgold_cfg;
int speed;

/*保存并测试现有的串口参数设置*/if(tcgetattr(fd&old_cfg)!=0){    perror(""tcgetattr"")exit (-1);}/*设置字符大小*/new_cfg = old_cfg;cfmakeraw(&new_cfg);new_cfg.c_cflag &= ~CSIZE;/**/switch(baud_rate){    case 2400:    {        speed = B2400;    }    break;    case 4800:    {        speed = B4800;    }    break;    case 9600:    {        speed = B9600;    }    break;    case 19200:    {        speed = B19200;    }    break;    case 38400:    {        speed = B38400;    }    break;    case 115200:    {        speed = B115200;    }    break;}cfsetispeed(&new_cfgspeed);cfsetospeed(&new_cfgspeed);/*停止位*/switch(data_bits){    case 7:    {        new_cfg.c_cflag |=CS7;    }    break;    default:    case 8:    {        new_cfg.c_cflag |=CS8;    }    break;}/*奇偶校验*/switch(parity){    default:    case 'n':    case 'N':    {        new_cfg.c_cflag &=~PARENB;        new_cfg.c_iflag &=~INPCK;    }    break;    case 'o':    case 'O':    {        new_cfg.c_cflag |= (PARODD | PARENB);        new_cfg.c_iflag |= INPCK;    }    break;    case 'e':    case 'E':    {        new_cfg.c_cflag |= PARENB;        new_cfg.c_cflag    &= ~PARODD;        new_cfg.c_iflag |= INPCK;    }    break;    case 's':    case 'S':    {        new_cfg.c_cflag &= ~PARENB;        new_cfg.c_cflag &= ~CSTOPB;    }    break;}/*设置停止位*/switch(stop_bits){    default:    case 1:    {        new_cfg.c_cflag &= ~CSTOPB;    }    break;    case 2:    {    new_cfg.c_cflag |= CSTOPB;    }}new_cfg.c_cc[VTIME] = 0;new_cfg.c_cc[VMIN] = 1;/*处理未接受字符*/tcflush(fdTCIFLUSH);/*激活新配置*/if((tcsetattr(fdTCSANOW&new_cfg))!=0){    perror(""tcsetattr"") exit (-1);}return 0;

}

int open_port(void){
int fd;
fd =open(""dev/ttyS1""O_RDWR|O_NOCTTY|O_NDELAY);
if(fd < 0)

{

perror(""open serial port"") exit (-1);

}

if(fcntl(fdF_SETFL0)<0)
{
perror(""fcntl F_SETFL
"");
exit (-1);
}

if(isatty(STDIN_FILENO)==0){    perror(""standrd input is not a terminal device"");    exit (-1);}return fd;

}

void read_485 (void)
{
char buff[100] = {0};

int fdsi;int len = 0;int fd_gpio = 0;unsigned char val;fd_gpio = open(DEV_PIO_LED O_RDWR);if(fd_gpio < 0){perror(""fd_gpio open err"");exit (-1);}//set dir of the pindavinci_gio_arg arg;            arg.pin_idx = PIO_NUM;        arg.pin_dir = AT91PIO_DIR_OUT;arg.pin_sta = 0;  ioctl(fd_gpio IOCTL_PIO_SETDIR &arg); //set the value of the pinioctl(fd_gpio IOCTL_PIO_SETSTA &arg); if((fds = open_port())<0)//打开设备{    perror(""open_port"");    exit (-1);}if(set_com_config(fds24008'N'1)<0)//配置串口{    perror(""set_com_config"");    exit (-1);}printf (""rev ready!
"");len = read (fds buff sizeof (buff));if (len < 0){perror (""read err"");exit (-1);}printf (""%s
"" buff);close (fds);printf (""test aaaaa
"");

}

void *write_rs485(void)
{
int fdsi;
int len = 0;
int fd_gpio = 0;
unsigned char val;

fd_gpio = open(DEV_PIO_LED O_RDWR);if(fd_gpio < 0){perror(""fd_gpio open err"");exit (-1);}//set dir of the pindavinci_gio_arg arg;            arg.pin_idx = PIO_NUM;        arg.pin_dir = AT91PIO_DIR_OUT;arg.pin_sta = 1;  ioctl(fd_gpio IOCTL_PIO_SETDIR &arg); //set the value of the pinioctl(fd_gpio IOCTL_PIO_SETSTA &arg); if((fds = open_port())<0)//打开设备{    perror(""open_port"");    exit (-1);}if(set_com_config(fds24008'N'1)<0)//配置串口{    perror(""set_com_config"");    exit (-1);}

// while(1)
// {
printf(""send ready!
"");
char buff[] = ""aa 55 05 00 33 44 14 90 00"";
int len1 = write(fdsbuffsizeof (buff));
if (len1 < 0)
{
perror (""write err"");
exit (-1);
}
printf (""send ok!
"");

// }
close (fds);
}

int main (void)
{
pthread_t tTransCtrlThread;
if(pthread_create(&tTransCtrlThreadNULLwrite_rs485NULL))
{
perror (""read_rs485 create fail"");
exit (-1);
}
sleep (5);
read_485();
return 0;
}

解决方案

RS232 串口通信
 RS232串口通信详解
 RS232串口通信详解

解决方案二：
什么东西啊，可以教教我吗

时间： 2024-08-03 22:21:55

rs485多路串口通信。。

问题描述

解决方案