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void Modbus::get_FC3() {
uint8_t u8byte, i;
u8byte = 3;
for (i = 0; i < au8Buffer[ 2 ] / 2; i++) {
au16regs[ i ] = word(
au8Buffer[ u8byte ],
au8Buffer[ u8byte + 1 ]);
u8byte += 2;
}
}
int8_t Modbus::process_FC1( uint16_t *regs, uint8_t u8size ) {
uint8_t u8currentRegister, u8currentBit, u8bytesno, u8bitsno;
uint8_t u8CopyBufferSize;
uint16_t u16currentCoil, u16coil;
// get the first and last coil from the message
uint16_t u16StartCoil = word( au8Buffer[ ADD_HI ], au8Buffer[ ADD_LO ] );
uint16_t u16Coilno = word( au8Buffer[ NB_HI ], au8Buffer[ NB_LO ] );
// put the number of bytes in the outcoming message
u8bytesno = (uint8_t) (u16Coilno / 8);
if (u16Coilno % 8 != 0) u8bytesno ++;
au8Buffer[ ADD_HI ] = u8bytesno;
u8BufferSize = ADD_LO;
// read each coil from the register map and put its value inside the outcoming message
u8bitsno = 0;
for (u16currentCoil = 0; u16currentCoil < u16Coilno; u16currentCoil++) {
u16coil = u16StartCoil + u16currentCoil;
u8currentRegister = (uint8_t) (u16coil / 16);
u8currentBit = (uint8_t) (u16coil % 16);
bitWrite(
au8Buffer[ u8BufferSize ],
u8bitsno,
bitRead( regs[ u8currentRegister ], u8currentBit ) );
u8bitsno ++;
if (u8bitsno > 7) {
u8bitsno = 0;
u8BufferSize++;
}
}
// send outcoming message
if (u16Coilno % 8 != 0) u8BufferSize ++;
u8CopyBufferSize = u8BufferSize +2;
sendTxBuffer();
return u8CopyBufferSize;
}
int8_t Modbus::process_FC3( uint16_t *regs, uint8_t u8size ) {
uint8_t u8StartAdd = word( au8Buffer[ ADD_HI ], au8Buffer[ ADD_LO ] );
uint8_t u8regsno = word( au8Buffer[ NB_HI ], au8Buffer[ NB_LO ] );
uint8_t u8CopyBufferSize;
uint8_t i;
au8Buffer[ 2 ] = u8regsno * 2;
u8BufferSize = 3;
for (i = u8StartAdd; i < u8StartAdd + u8regsno; i++) {
au8Buffer[ u8BufferSize ] = highByte(regs[i]);
u8BufferSize++;
au8Buffer[ u8BufferSize ] = lowByte(regs[i]);
u8BufferSize++;
}
u8CopyBufferSize = u8BufferSize +2;
sendTxBuffer();
return u8CopyBufferSize;
}
int8_t Modbus::process_FC5( uint16_t *regs, uint8_t u8size ) {
uint8_t u8currentRegister, u8currentBit;
uint8_t u8CopyBufferSize;
uint16_t u16coil = word( au8Buffer[ ADD_HI ], au8Buffer[ ADD_LO ] );
// point to the register and its bit
u8currentRegister = (uint8_t) (u16coil / 16);
u8currentBit = (uint8_t) (u16coil % 16);
// write to coil
bitWrite(
regs[ u8currentRegister ],
u8currentBit,
au8Buffer[ NB_HI ] == 0xff );
// send answer to master
u8BufferSize = 6;
u8CopyBufferSize = u8BufferSize +2;
sendTxBuffer();
return u8CopyBufferSize;
}
int8_t Modbus::process_FC6( uint16_t *regs, uint8_t u8size ) {
uint8_t u8add = word( au8Buffer[ ADD_HI ], au8Buffer[ ADD_LO ] );
uint8_t u8CopyBufferSize;
uint16_t u16val = word( au8Buffer[ NB_HI ], au8Buffer[ NB_LO ] );
regs[ u8add ] = u16val;
// keep the same header
u8BufferSize = RESPONSE_SIZE;
u8CopyBufferSize = u8BufferSize +2;
sendTxBuffer();
return u8CopyBufferSize;
}
int8_t Modbus::process_FC15( uint16_t *regs, uint8_t u8size ) {
uint8_t u8currentRegister, u8currentBit, u8frameByte, u8bitsno;
uint8_t u8CopyBufferSize;
uint16_t u16currentCoil, u16coil;
boolean bTemp;
// get the first and last coil from the message
uint16_t u16StartCoil = word( au8Buffer[ ADD_HI ], au8Buffer[ ADD_LO ] );
uint16_t u16Coilno = word( au8Buffer[ NB_HI ], au8Buffer[ NB_LO ] );
// read each coil from the register map and put its value inside the outcoming message
u8bitsno = 0;
u8frameByte = 7;
for (u16currentCoil = 0; u16currentCoil < u16Coilno; u16currentCoil++) {
u16coil = u16StartCoil + u16currentCoil;
u8currentRegister = (uint8_t) (u16coil / 16);
u8currentBit = (uint8_t) (u16coil % 16);
bTemp = bitRead(
au8Buffer[ u8frameByte ],
u8bitsno );
bitWrite(
regs[ u8currentRegister ],
u8currentBit,
bTemp );
u8bitsno ++;
if (u8bitsno > 7) {
u8bitsno = 0;
u8frameByte++;
}
}
// send outcoming message
// it's just a copy of the incomping frame until 6th byte
u8BufferSize = 6;
u8CopyBufferSize = u8BufferSize +2;
sendTxBuffer();
return u8CopyBufferSize;
}
int8_t Modbus::process_FC16( uint16_t *regs, uint8_t u8size ) {
uint8_t u8func = au8Buffer[ FUNC ]; // get the original FUNC code
uint8_t u8StartAdd = au8Buffer[ ADD_HI ] << 8 | au8Buffer[ ADD_LO ];
uint8_t u8regsno = au8Buffer[ NB_HI ] << 8 | au8Buffer[ NB_LO ];
uint8_t u8CopyBufferSize;
uint8_t i;
uint16_t temp;
// build header
au8Buffer[ NB_HI ] = 0;
au8Buffer[ NB_LO ] = u8regsno;
u8BufferSize = RESPONSE_SIZE;
// write registers
for (i = 0; i < u8regsno; i++) {
temp = word(
au8Buffer[ (BYTE_CNT + 1) + i * 2 ],
au8Buffer[ (BYTE_CNT + 2) + i * 2 ]);
regs[ u8StartAdd + i ] = temp;
}
u8CopyBufferSize = u8BufferSize +2;
sendTxBuffer();
return u8CopyBufferSize;
}
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