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ModbusIP.cpp
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168 lines (144 loc) · 6.24 KB
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/*
ModbusIP.cpp - Source for Modbus IP Library
Copyright (C) 2015 André Sarmento Barbosa
Add support for RS485 relay (by Frederic RIBLE)
*/
#include "ModbusIP.h"
#include "ModbusRelay.h"
ModbusIP::ModbusIP():_server(MODBUSIP_PORT) {
this->_slaveId= 1;
this->client = NULL;
}
void ModbusIP::config() {
_server.begin();
}
void ModbusIP::config(uint8_t *mac) {
Ethernet.begin(mac);
_server.begin();
}
void ModbusIP::config(uint8_t *mac, IPAddress ip) {
Ethernet.begin(mac, ip);
_server.begin();
}
void ModbusIP::config(uint8_t *mac, IPAddress ip, IPAddress dns) {
Ethernet.begin(mac, ip, dns);
_server.begin();
}
void ModbusIP::config(uint8_t *mac, IPAddress ip, IPAddress dns, IPAddress gateway) {
Ethernet.begin(mac, ip, dns, gateway);
_server.begin();
}
void ModbusIP::config(uint8_t *mac, IPAddress ip, IPAddress dns, IPAddress gateway, IPAddress subnet) {
Ethernet.begin(mac, ip, dns, gateway, subnet);
_server.begin();
}
void ModbusIP::configRelay(HardwareSerial* port, long baud, u_int format, void (*_switch_txrx)(ModbusRelay::txrx_mode)) {
_relay.configRelay(port, baud, format, _switch_txrx);
}
void ModbusIP::pollSerial()
{
_relay.pollSerial();
}
void ModbusIP::pollTCP()
{
_relay.pollTCP();
client = _server.available();
if (client) {
if (client.connected()) {
int i = 0;
while (client.available()){
_MBAP[i] = client.read();
i++;
if (i==7) break; //MBAP length has 7 bytes size
}
_len = _MBAP[4] << 8 | _MBAP[5];
_len--; // Do not count with last byte from MBAP
if (_MBAP[2] !=0 || _MBAP[3] !=0) return; //Not a MODBUSIP packet
if (_len > MODBUSIP_MAXFRAME) return; //Length is over MODBUSIP_MAXFRAME
_frame = (byte*) malloc(_len);
i = 0;
while (client.available()){
_frame[i] = client.read();
i++;
if (i==_len) break;
}
if (_MBAP[6] == this->_slaveId) { // This MODBUS frame is for us
this->receivePDU(_frame);
if (_reply != MB_REPLY_OFF) {
//MBAP
_MBAP[4] = (_len+1) >> 8; //_len+1 for last byte from MBAP
_MBAP[5] = (_len+1) & 0x00FF;
byte sendbuffer[7 + _len];
for (i = 0 ; i < 7 ; i++) {
sendbuffer[i] = _MBAP[i];
}
//PDU Frame
for (i = 0 ; i < _len ; i++) {
sendbuffer[i+7] = _frame[i];
}
client.write(sendbuffer, _len + 7);
}
}
else { // Relay over RS485 Serial line
_relay.TX(client, _MBAP, _frame, _len);
}
#ifndef TCP_KEEP_ALIVE
client.stop();
#endif
free(_frame);
_len = 0;
}
}
}
/* Table of CRC values for high–order byte */
const byte _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};
/* Table of CRC values for low–order byte */
const byte _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};
word ModbusIP::calcCrc(byte address, byte* pduFrame, byte pduLen) {
byte CRCHi = 0xFF, CRCLo = 0x0FF, Index;
Index = CRCHi ^ address;
CRCHi = CRCLo ^ _auchCRCHi[Index];
CRCLo = _auchCRCLo[Index];
while (pduLen--) {
Index = CRCHi ^ *pduFrame++;
CRCHi = CRCLo ^ _auchCRCHi[Index];
CRCLo = _auchCRCLo[Index];
}
return (CRCHi << 8) | CRCLo;
}