uart1.h

arm控制gprs模块

#include     <stdio.h>      /* stand input and output... */
#include     "fcntl.h"      /* file controle */
#include     "termios.h"    /*PPSIX terminal controle */
#include     "errno.h"     /* error */

void set_speed(int fd, int speed);
int set_data_format(int fd,int databits,int stopbits,int parity);
void Uart_Init(int fd);
void Uart_Send(int fd, char *data,int n);
void Uart_Getch(int fd, char *recv);

/************ 设置波特率 ********************/

void set_speed(int fd, int speed)
{
    int   i;
    int   status;
    struct termios Opt;

    tcgetattr(fd, &Opt);  // get attribute of serial port
    tcflush(fd, TCIOFLUSH);
    cfsetispeed(&Opt, speed);
    cfsetospeed(&Opt, speed);

    status = tcsetattr(fd, TCSANOW, &Opt);  // set attribute
    if  (status != 0)
    {
        perror("tcsetattr fd1");
        return;
    }
    tcflush(fd,TCIOFLUSH);
}


/***********设置串口模式**********/

int set_data_format(int fd,int databits,int stopbits,int parity)
{
    struct termios opt;

    if( tcgetattr(fd, &opt)  !=  0)
    {
  	perror("SetupSerial 1");
  	return(FALSE);
    }
    opt.c_cflag &= ~CSIZE;

    switch (databits)
    {
 	
        case 5:
  		opt.c_cflag |= CS5;
  		break;
        case 6:
  		opt.c_cflag |= CS6;
  		break;
        case 7:
  		opt.c_cflag |= CS7;
  		break;
  	case 8:
		opt.c_cflag |= CS8;
		break;
	default:
		fprintf(stderr,"Unsupported data size\n");
		return (FALSE);
    }
    switch (parity)
    {
        case 'n':
        case 'N':
		opt.c_cflag &= ~PARENB;   /* Clear parity enable */
		opt.c_iflag &= ~INPCK;     /* Enable parity checking */
		break;
	case 'o':
	case 'O':
		opt.c_cflag |= (PARODD | PARENB);  /* parity checking */ 
		opt.c_iflag |= INPCK;      /* Disnable parity checking */
		break;
	case 'e':
	case 'E':
		opt.c_cflag |= PARENB;     /* Enable parity */
		opt.c_cflag &= ~PARODD;   /*  */  
		opt.c_iflag |= INPCK;       /* Disnable parity checking */
		break;
//	case 'S':
//	case 's':  /*as no parity*/
//		opt.c_cflag &= ~PARENB;
//		opt.c_cflag &= ~CSTOPB;
//		break;
	default:
		fprintf(stderr,"Unsupported parity\n");
		return (FALSE);
    }
       
    switch (stopbits)
    {
        case 1:
  		opt.c_cflag &= ~CSTOPB;
		break;
	case 2:
		opt.c_cflag |= CSTOPB;
		break;
	default:
		fprintf(stderr,"Unsupported stop bits\n");
		return (FALSE);
    }

    /* Set input parity option */
    if (parity != 'n')
     	opt.c_iflag |= INPCK;
    opt.c_cc[VTIME] = 100; // 10 seconds
    opt.c_cc[VMIN] = 0;

    tcflush(fd, TCIFLUSH); /* Update the options and do it NOW */
    if (tcsetattr(fd, TCSANOW, &opt) != 0)
    {
  	perror("SetupSerial 3");
	return (FALSE);
    }
 
    return (TRUE);
 }

/********************/

void Uart_Init(int fd)
{
  set_speed(fd, B115200);
  if (set_data_format(fd,8,1,'N')==FALSE)
  {
    printf("set parity error! \n");
    exit(1);
  }
}

void Uart_Send(int fd, char *data,int n)
{
  int send_len;
  send_len=write(fd,data,n);
  while(send_len!=n)
  {
    printf("send data erro! send again!\n");
    send_len=write(fd,data,n);
  }
  printf("send data succesful!\n");
}

void Uart_Getch(int fd, char *recv)
{
  read(fd, recv, 32);
  printf("Received data: %s", recv);
}