?? modbus_master_example.c
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#define READ_COIL 01#define READ_DI 02#define READ_HLD_REG 03#define READ_AI 04#define SET_COIL 05#define SET_HLD_REG 06#define READ_FIFO 24#define PROTOCOL_EXCEPTION 0x81#define PROTOCOL_ERR 1#define FRM_ERR 2//unsigned char tx_buf[256],rx_buf[256]; const unsigned char auchCRCHi[] = {0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81,0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01,0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81,0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01,0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81,0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01,0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81,0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01,0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81,0x40} ;const unsigned char auchCRCLo[] = {0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 0x07, 0xC7, 0x05, 0xC5, 0xC4,0x04, 0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09,0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A, 0x1E, 0xDE, 0xDF, 0x1F, 0xDD,0x1D, 0x1C, 0xDC, 0x14, 0xD4, 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3,0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 0xF2, 0x32, 0x36, 0xF6, 0xF7,0x37, 0xF5, 0x35, 0x34, 0xF4, 0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A,0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38, 0x28, 0xE8, 0xE9, 0x29, 0xEB, 0x2B, 0x2A, 0xEA, 0xEE,0x2E, 0x2F, 0xEF, 0x2D, 0xED, 0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26,0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60, 0x61, 0xA1, 0x63, 0xA3, 0xA2,0x62, 0x66, 0xA6, 0xA7, 0x67, 0xA5, 0x65, 0x64, 0xA4, 0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F,0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68, 0x78, 0xB8, 0xB9, 0x79, 0xBB,0x7B, 0x7A, 0xBA, 0xBE, 0x7E, 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5,0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 0x70, 0xB0, 0x50, 0x90, 0x91,0x51, 0x93, 0x53, 0x52, 0x92, 0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C,0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x9A, 0x9B, 0x5B, 0x99, 0x59, 0x58, 0x98, 0x88,0x48, 0x49, 0x89, 0x4B, 0x8B, 0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 0x43, 0x83, 0x41, 0x81, 0x80,0x40} ;const unsigned char char_tab[128]= {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,1,2,3,4,5,6,7,8,9,0,0,0,0,0,0, 0,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 };const unsigned char tab_char[16]={ '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'} ;unsigned short crc(unsigned char *puchMsg , unsigned short usDataLen){ unsigned char uchCRCHi = 0xFF ; /* high byte of CRC initialized */ unsigned char uchCRCLo = 0xFF ; /* low byte of CRC initialized */ unsigned uIndex ; /* will index into CRC lookup table */ while (usDataLen--)/* pass through message buffer */ { uIndex = uchCRCHi ^ *puchMsg++ ; /* calculate the CRC */ uchCRCHi = uchCRCLo ^ auchCRCHi[uIndex]; uchCRCLo = auchCRCLo[uIndex] ; } return (uchCRCHi << 8 | uchCRCLo) ;}unsigned char a2toh(unsigned char *str){ unsigned char tmp; tmp=0; tmp=char_tab[*str]; str++; tmp=tmp*16 + char_tab[* str]; return tmp;}int get_bit( unsigned int data,int bit ){const unsigned int bit_tab[]={0x1,0x2,0x4,0x8,0x10,0x20,0x40,0x80,0x100,0x200,0x400,0x800,0x1000,0x2000,0x4000,0x8000}; if (bit >16) return 0; if (data & bit_tab[bit]) return 1; else return 0;}void htoa( char *str,unsigned char num)//十六進制轉換為ASCII碼{ unsigned char tmp; tmp=num; tmp=tmp &0xf0; tmp>>=4; *str= tab_char [ tmp]; str++; *str= tab_char [ num &0x0f];}int asctortu( unsigned char *dest,unsigned char *source){ unsigned char *tmp; unsigned char i; i=0; tmp=dest; if( *source !=':') return 0; source ++; while ( *source !=0x0d) { *tmp=a2toh( source); tmp ++; source ++; source ++; i++; } source ++; if ( *source !=0x0a) return 0; else { return i; }}void rtutoascii( unsigned char *dest,unsigned char *source,int lenth){ dest ++; for ( ; lenth>0;lenth--) { htoa( dest,*source); dest++; dest++; source++; } }void rtutoasc( unsigned char *dest,unsigned char *source,int lenth){ dest ++; for ( ; lenth>0;lenth--) { htoa( dest,*source); dest++; dest++; source++; } }unsigned char lrc(unsigned char *str,int lenth){ unsigned char tmp; tmp=0; while (lenth-- ) { tmp+= *str++; } return ((unsigned char)(-((char)tmp)));}void construct_ascii_frm ( unsigned char *dst_buf,unsigned char *src_buf,unsigned char lenth){unsigned char lrc_tmp;lrc_tmp= lrc( src_buf,lenth);*(src_buf+lenth)=lrc_tmp;lenth++;*dst_buf=':';rtutoascii ( dst_buf,src_buf,lenth);*(dst_buf+2 * lenth)=0x0d;*(dst_buf+2 * lenth+1)=0x0a;}void construct_rtu_frm ( unsigned char *dst_buf,unsigned char *src_buf,unsigned char lenth){unsigned short crc_tmp;crc_tmp= crc( src_buf,lenth);*(src_buf+lenth)=crc_tmp >>8 ;*(src_buf+lenth+1)=crc_tmp & 0xff;lenth++;lenth++; while ( lenth--) { *dst_buf=*src_buf; dst_buf++; src_buf++; }}/*1 讀取繼電器狀態發送：*/int ascii_read_coil_status ( unsigned char board_adr,unsigned char *com_buf,int start_address,int lenth) {unsigned char tmp[256],tmp_lenth;tmp[0]= board_adr;tmp[1]= READ_COIL;tmp[2]= start_address/256;tmp[3]= start_address & 0xff;tmp[4]= lenth/256;tmp[5]= lenth &0xff;tmp_lenth=6;construct_ascii_frm (com_buf,tmp,tmp_lenth);return 17;}int rtu_read_coil_status ( unsigned char board_adr,unsigned char *com_buf,int start_address,int lenth) {unsigned char tmp[256],tmp_lenth;tmp[0]=board_adr;tmp[1]=READ_COIL;tmp[2]= start_address/256;tmp[3]=start_address & 0xff;tmp[4]= lenth/256;tmp[5]= lenth &0xff;tmp_lenth=6;construct_rtu_frm ( com_buf,tmp,tmp_lenth);return 8;}/*2 讀取開關量輸入發送：*/int ascii_read_input_status ( unsigned char board_adr,unsigned char *com_buf,int start_address,int lenth) {unsigned char tmp[256],tmp_lenth;tmp[0]=board_adr;tmp[1]=READ_DI;tmp[2]= start_address/256;tmp[3]=start_address & 0xff;tmp[4]= lenth/256;tmp[5]= lenth &0xff;tmp_lenth=6;construct_ascii_frm ( com_buf,tmp,tmp_lenth);return 17;}int rtu_read_input_status ( unsigned char board_adr,unsigned char *com_buf,int start_address,int lenth) {unsigned char tmp[256],tmp_lenth;tmp[0]=board_adr;tmp[1]=READ_DI;tmp[2]= start_address/256;tmp[3]=start_address & 0xff;tmp[4]= lenth/256;tmp[5]= lenth &0xff;tmp_lenth=6;construct_rtu_frm ( com_buf,tmp,tmp_lenth);return 8;}/*3 讀取保持寄存器發送：*/int ascii_read_hldreg ( unsigned char board_adr,unsigned char *com_buf,int start_address,int lenth) {unsigned char tmp[256],tmp_lenth;tmp[0]=board_adr;tmp[1]=READ_HLD_REG;tmp[2]= start_address/256;tmp[3]=start_address & 0xff;tmp[4]= lenth/256;tmp[5]= lenth &0xff;tmp_lenth=6;construct_ascii_frm ( com_buf,tmp,tmp_lenth);return 17;}int rtu_read_hldreg ( unsigned char board_adr,unsigned char *com_buf,int start_address,int lenth) {unsigned char tmp[256],tmp_lenth;tmp[0]=board_adr;?? 快捷鍵說明
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