linux下 串口与gprs模块通信

#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 <signal.h> #include <time.h> #include <string.h> #include <sys/timeb.h> #include <sys/io.h> #include <sys/time.h> #include <fcntl.h> #include <asm/ioctls.h> #include <sys/mman.h> #include <sys/ioctl.h> #define PIN_BASE 32 #define AT91_PIN_PA(n) (PIN_BASE + 0x00 + n) #define AT91_PIN_PB(n) (PIN_BASE + 0x20 + n) #define AT91_PIN_PC(n) (PIN_BASE + 0x40 + n) #define AT91_PIN_PD(n) (PIN_BASE + 0x60 + n) #define AT91_PIN_PE(n) (PIN_BASE + 0x80 + n) // 9g25 new driver #define CMD_INIT_OUT 0xC00BE01 #define CMD_INIT_IN 0xC00BE02 #define CMD_SET_VAL 0xC00BE03 #define CMD_GET_VAL 0xC00BE04 #define TRUE 0 #define FALSE -1 #define SPEED_NUM 4 #define BAUDRATE 115200 int fd_gpio; int fd; int speed_arr[SPEED_NUM][2] = { {9600,B9600}, {38400,B38400}, {19200,B19200}, {115200,B115200}}; int set_speed(int fd, int speed) { int i; int status; struct termios Opt; tcgetattr(fd, &Opt); for ( i= 0; i < SPEED_NUM; i++){ if (speed == speed_arr[i][0]){ tcflush(fd, TCIOFLUSH); cfsetispeed(&Opt, speed_arr[i][1]); cfsetospeed(&Opt, speed_arr[i][1]); status = tcsetattr(fd, TCSANOW, &Opt); if (status != 0){ perror("tcsetattr fd"); return FALSE; } tcflush(fd,TCIOFLUSH); return TRUE; } } return FALSE; } int set_Parity(int fd,int databits,int stopbits,int parity) { struct termios options; if ( tcgetattr( fd,&options) != 0){ perror("SetupSerial 1"); return(FALSE); } options.c_cflag &= ~CSIZE; switch (databits){ case 7: options.c_cflag |= CS7; break; case 8: options.c_cflag |= CS8; break; default: fprintf(stderr,"Unsupported data size\n"); return (FALSE); } switch (parity){ case 'n': case 'N': options.c_cflag &= ~PARENB; /* Clear parity enable */ options.c_iflag &= ~INPCK; /* Enable parity checking */ break; case 'o': case 'O': options.c_cflag |= (PARODD | PARENB); /* 设置为奇效验*/ options.c_iflag |= INPCK; /* Disnable parity checking */ break; case 'e': case 'E': options.c_cflag |= PARENB; /* Enable parity */ options.c_cflag &= ~PARODD; /* 转换为偶效验*/ options.c_iflag |= INPCK; /* Disnable parity checking */ break; case 'S': case 's': /*as no parity*/ options.c_cflag &= ~PARENB; options.c_cflag &= ~CSTOPB; break; default: fprintf(stderr,"Unsupported parity\n"); return (FALSE); } switch (stopbits){ case 1: options.c_cflag &= ~CSTOPB; break; case 2: options.c_cflag |= CSTOPB; break; default: fprintf(stderr,"Unsupported stop bits\n"); return (FALSE); } /* Set input parity option */ if (parity != 'n') options.c_iflag |= INPCK; options.c_iflag &= ~(IXON | IXOFF | IXANY); options.c_iflag &= ~(INLCR | IGNCR | ICRNL); tcflush(fd,TCIFLUSH); options.c_cc[VTIME] = 100; // set timeouts 0.5 seconds options.c_cc[VMIN] = 0; //Update the options and do it NOW options.c_lflag &= ~(ICANON|ECHO|ECHOE|ISIG); options.c_oflag &= ~OPOST; options.c_cflag |= (CLOCAL | CREAD);// | CRTSCTS); tcflush(fd,TCIFLUSH); /* Update the options and do it NOW */ if (tcsetattr(fd,TCSANOW,&options) != 0){ perror("SetupSerial 3"); return (FALSE); } return (TRUE); } int OpenDev(char *Dev) { int fd = open(Dev, O_RDWR | O_NOCTTY | O_NONBLOCK); if (-1 == fd){ perror("Can't Open Serial Port"); return -1; } return fd; } int WriteBuf(int fd,char buf[],int num) { int count; count = write(fd,buf,num); return count; } int init(void) { if(!(fd = open("/dev/ttyS0",O_RDWR | O_NOCTTY | O_NONBLOCK))) { fprintf(stderr, " /dev/ttyS0 : %s\n", strerror(errno)); return -1; } if(fd>0){ if(set_speed(fd,BAUDRATE) == TRUE){ printf("(port%c)speed = %d\n", 'A',BAUDRATE); } else{ printf("(port%c) set_speed error\n",'A'); } } else{ printf("Can't Open Serial Port!\n"); exit(0); } if (set_Parity(fd,8,1,'N')== FALSE){ printf("Set Parity Error\n"); exit(1); } return 0; } int main(int argc, char **argv) { unsigned int i,j; char *sendData = "AT\r"; char rcvdata[128] = {}; int ret; init(); fd_gpio = open("/dev/gpio", O_RDWR | O_NONBLOCK); if ( fd_gpio < 0 ) { perror("open /dev/gpio error\n"); return -1; } ioctl(fd_gpio,CMD_INIT_OUT,(AT91_PIN_PA(4)<<1)|0); //POW ioctl(fd_gpio,CMD_INIT_OUT,(AT91_PIN_PA(28)<<1)|1); //ONOFF ioctl(fd_gpio,CMD_INIT_OUT,(AT91_PIN_PA(20)<<1)|1); //RST ioctl(fd_gpio,CMD_SET_VAL,(AT91_PIN_PA(4)<<1)|0); ioctl(fd_gpio,CMD_SET_VAL,(AT91_PIN_PA(28)<<1)|1); ioctl(fd_gpio,CMD_SET_VAL,(AT91_PIN_PA(20)<<1)|1); ioctl(fd_gpio,CMD_INIT_IN,(AT91_PIN_PA(18)<<1)|0); ioctl(fd_gpio,CMD_INIT_IN,(AT91_PIN_PA(16)<<1)|0); printf(" gprs power on!! \r\n"); ioctl(fd_gpio,CMD_SET_VAL,(AT91_PIN_PA(4)<<1)|1); usleep(200000); ioctl(fd_gpio,CMD_SET_VAL,(AT91_PIN_PA(28)<<1)|0); sleep(1); ioctl(fd_gpio,CMD_SET_VAL,(AT91_PIN_PA(28)<<1)|1); sleep(5); printf("sleep........................\n"); printf("start test gprs\n"); while(1) { ret = WriteBuf(fd,sendData,sizeof(sendData)); if(ret > 0) { printf("gprs sendData :%s\n",sendData); } for(i=0;i<10;i++) { sleep(2); ret = read(fd,rcvdata,6); if(ret > 0) { printf("gprs recvData :%s\n",rcvdata); } } sleep(1); } close(fd); return 0; }