LINUX环境,串口通讯案例源代码参考.doc

LINUX环境，串口通讯案例源代码参考#include #include #include #include #include #include #include #include #include #include #include #include #include #define FALSE -1#define TRUE 1int my_write(int fd,void *buffer,int length) int bytes_left; int written_bytes; char *ptr; ptr=buffer; bytes_left=length; while(bytes_left0) written_bytes=write(fd,ptr,bytes_left); if(written_bytes0) if(errno=EINTR) written_bytes=0; elsereturn(-1); bytes_left-=written_bytes; ptr+=written_bytes; return(0);/ 16位crc校验void checksum(unsigned char *data,unsigned char *check,int n) long temp=0; int i; for(i=0;i8)&0xff); check1=(temp&0xff);void lchecksum(unsigned char lenid,char *lenth) / 16位crc校验 *(lenth+3)=lenid&0x0f; *(lenth+2)=(lenid4)&0x0f; *(lenth+1)=(lenid8)&0x0f; *lenth=(*(lenth+3)+(*(lenth+2)+(*(lenth+1)%16)+1)&0x0f;/定义内核bott常量对照表int speed_arr = B38400, B19200, B9600, B4800, B2400, B1200, B300, B38400, B19200, B9600, B4800, B2400, B1200, B300, ;int name_arr = 38400, 19200, 9600, 4800, 2400, 1200, 300, 38400, 19200, 9600, 4800, 2400, 1200, 300, ;/定义bott率void set_speed(int fd, int speed) int i,status; struct termios Opt; tcgetattr(fd, &Opt); for ( i= 0; i 0) set_speed(fd,4800); else printf(Cant Open Serial Port!n); exit(1); if (set_Parity(fd,8,1,N)= FALSE) printf(Set Parity Errorn); exit(1); while(1) n_read = 0; recvlen = 0; printf(4800 8 1 Nn); bzero(recvbuf,sizeof(recvbuf); bzero(recvdata,sizeof(recvdata); FD_ZERO(&readfds); FD_SET(fd,&readfds); while(1) /timeout.tv_sec=1; /timeout.tv_usec=0; /ret=select(keyboard+1,&readfd,NULL,NULL,&timeout); /tv.tv_sec=10; /tv.tv_usec=0; /if(select(fd+1,&readfds,NULL,NULL,&tv)0)/被动的等待数据，直到超出tv设置 if(select(fd+1,&readfds,NULL,NULL,NULL)0)/被动的等待数据，没有数据时一直等待 if(FD_ISSET(fd,&readfds) if(n_read =read(fd,recvbuf,1024)=-1) printf(no read data n); break; else for(k=0;kn_read;k+) /recvdatarecvlen+k=recvbufk; memcpy(recvdata+recvlen+k,recvbuf+k,97); recvlen=recvlen+n_read; if(recvlen97) continue; break;break; break; printf(recvdata=); for(tt=0;tt97;tt+) printf(%02X ,recvdatatt); printf(n); printf(moniliang shoudaon); /sprintf(a,AC 13 AA 00 00 00 00 00 00 00 00 00 00 96 00 01 02 03 00 00 64 00 64 00 64 00 64 00 84 00 2C 00 2C 00 2C 00 84 00 2C 00 2C 00 2C 00 64 00 64 00 64 00 64 00 7F 00 20 00 34 00 2B 00 7F 00 20 00 34 00 2B 00 00 00 00 00 00 00 00 00 01 01 00 00 00 02 00 05 00 0F 00 18 00 14 00 13 00 13 00 13 00 DB 00 DA 00 D9 00 E6 00 E4 00 E1 03 4D 01 A9 01 A4 79 FF 18 81); sprintf(a,AC 13 AA 00 00 00 00 00 00 00 00 00 00 96 00 01 02 03 00 00 64 00 64 00 64 00 64 00 84 00 2C 00 2C 00 2C 00 84 00 2C 00 2C 00 2C 00 64 00 64 00 64 00 64 00 7F 00 20 00 34 00 2B 00 7F 00 20 00 34 00 2B 00 00 00 00 00 00 00 00 00 01 01 ff ff ff ff 00 05 00 0F 00 18 00 14 00 13 00 13 00 13 00 DB 00 DA 00 D9 00 E6 00 E4 00 E1 03 4D 01 A9 01 A4 79 FF 18 81); for(i=0;i118;i+) if(p=strstr(a, )!=NULL) *p=0; sprintf(bi,%s,a); sendatai=strtol(bi,NULL,16); sprintf(a,%s,p+1); else sprintf(bi,%s,a); sendat