/*........................crc function.......................*/ static 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 } ; static 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 } ; unsigned char crcval[8]; unsigned char crcval1[9]; unsigned char crcval2[6]; //crc function begins unsigned short CRC16 ( unsigned char *puchMsg, unsigned short usDataLen, int hl) { unsigned char uchCRCHi = 0xff; unsigned char uchCRCLo = 0xff; unsigned int uIndex; while(usDataLen--) { uIndex = uchCRCLo ^ *puchMsg++; uchCRCLo = uchCRCHi ^ auchCRCHi[uIndex]; uchCRCHi = auchCRCLo[uIndex]; } if (hl==1) return (uchCRCHi);//<<8 ; else return(uchCRCLo); } /*..................crc ends....................*/ /*-----( Import needed libraries )-----*/ #include /*-----( Declare Constants and Pin Numbers )-----*/ #define SSerialRX 10 //Serial Receive pin #define SSerialTX 11 //Serial Transmit pin #define SSerialTxControl 3 //RS485 Direction control #define RS485Transmit HIGH #define RS485Receive LOW #define Pin13LED 13 /*-----( Declare objects )-----*/ SoftwareSerial RS485Serial(SSerialRX, SSerialTX); // RX, TX /*-----( Declare Variables )-----*/ int i,j,t,t1,t2; uint8_t byteReceived[8]; uint8_t byteSend[8]; //uint8_t byteReceivedold; uint8_t byteReceived1=5; unsigned short CRC16 ( unsigned char * puchMsg, unsigned short usDataLen, int hl ); uint8_t res[2]; uint8_t byteReceived1_a[11]; uint8_t byteReceived1_d[7]; void setup() /****** SETUP: RUNS ONCE ******/ { i=0; t=0; t1=0; t2=0; // Start the built-in serial port, probably to Serial Monitor Serial.begin(9600); pinMode(Pin13LED, OUTPUT); pinMode(SSerialTxControl, OUTPUT); digitalWrite(SSerialTxControl, RS485Receive); // Init Transceiver // Start the software serial port, to another device RS485Serial.begin(9600); // set the data rate }//--(end setup )--- void loop() /****** LOOP: RUNS CONSTANTLY ******/ { digitalWrite(Pin13LED, HIGH); // Show activity while(Serial.available()>0) { byteReceived[i++]= Serial.read(); //byteReceived=Serial.readBytesUntil('1',byteReceivedold,7); if(i==8) { for(j=0;j<8;++j) crcval[j]=byteReceived[j]; res[0] = CRC16 (crcval,8,0); res[1]= CRC16 (crcval,8,1); if (res[0]==0 && res[1]==0) { digitalWrite(SSerialTxControl, RS485Transmit); // Enable RS485 Transmit RS485Serial.write(byteReceived[0]); // Send byte to Remote Arduino RS485Serial.write(byteReceived[1]); RS485Serial.write(byteReceived[2]); RS485Serial.write(byteReceived[3]); RS485Serial.write(byteReceived[4]); RS485Serial.write(byteReceived[5]); RS485Serial.write(byteReceived[6]); RS485Serial.write(byteReceived[7]); i=0; } } digitalWrite(Pin13LED, LOW); // Show activity //delay(10); digitalWrite(SSerialTxControl, RS485Receive); // Disable RS485 Transmit } if(byteReceived[1]==3) { if (RS485Serial.available()) //Look for data from other Arduino { byteReceived1_a[t1++] = RS485Serial.read(); if(t1==11) { for(j=1;j<10;j++) crcval1[j-1]=byteReceived1_a[j]; res[0]= CRC16 (crcval1,9,0); res[1]= CRC16 (crcval1,9,1); if (res[0]==0 && res[1]==0) { Serial.write(byteReceived1_a[0]); Serial.write(byteReceived1_a[1]); Serial.write(byteReceived1_a[2]); Serial.write(byteReceived1_a[3]); Serial.write(byteReceived1_a[4]); Serial.write(byteReceived1_a[5]); Serial.write(byteReceived1_a[6]); Serial.write(byteReceived1_a[7]); Serial.write(byteReceived1_a[8]); Serial.write(byteReceived1_a[9]); Serial.write(byteReceived1_a[10]); t1=0; } } } } else if(byteReceived[1]==1) { if (RS485Serial.available()) //Look for data from other Arduino { byteReceived1_d[t2++] = RS485Serial.read(); // Read received byte if(t2==7) { for(j=0;j<6;++j) crcval2[j]=byteReceived1_d[j]; res[0] = CRC16 (crcval2,6,0); res[1]= CRC16 (crcval2,6,1); if (res[0]==0 && res[1]==0) { Serial.write(byteReceived1_d[0]); Serial.write(byteReceived1_d[1]); Serial.write(byteReceived1_d[2]); Serial.write(byteReceived1_d[3]); Serial.write(byteReceived1_d[4]); Serial.write(byteReceived1_d[5]); Serial.write(byteReceived1_d[6]); t2=0; } digitalWrite(Pin13LED, LOW); // Show activity } } } }//--(end main loop )--- //*********( THE END )***********