modbusbase.cpp
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/*
* Copyright (c) 2022 Peter M. Groen
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
#include "modbusbase.h"
int ModbusBase::readCoils(uint16_t address, uint16_t amount, bool *buffer)
{
if (m_connected)
{
if (amount > 2040)
{
setBadInput();
return EX_BAD_DATA;
}
modbusRead(address, amount, READ_COILS);
uint8_t to_rec[MAX_MSG_LENGTH];
ssize_t result = modbusReceive(to_rec);
if (result == -1)
{
setBadConnection();
return BAD_CON;
}
modbusErrorHandle(to_rec, READ_COILS);
if (err)
{
return err_no;
}
for (auto i = 0; i < amount; i++)
{
buffer[i] = (bool)((to_rec[9u + i / 8u] >> (i % 8u)) & 1u);
}
return 0;
}
else
{
setBadConnection();
return BAD_CON;
}
}
int ModbusBase::readInputBits(uint16_t address, uint16_t amount, bool *buffer)
{
if (m_connected)
{
if (amount > 2040)
{
setBadInput();
return EX_BAD_DATA;
}
modbusRead(address, amount, READ_INPUT_BITS);
uint8_t to_rec[MAX_MSG_LENGTH];
ssize_t result = modbusReceive(to_rec);
if (result == -1)
{
setBadConnection();
return BAD_CON;
}
if (err)
{
return err_no;
}
for (auto i = 0; i < amount; i++)
{
buffer[i] = (bool)((to_rec[9u + i / 8u] >> (i % 8u)) & 1u);
}
modbusErrorHandle(to_rec, READ_INPUT_BITS);
return 0;
}
else
{
return BAD_CON;
}
}
int ModbusBase::readHoldingRegisters(uint16_t address, uitn16_t amount, uint16_t *buffer)
{
if (m_connected)
{
modbusRead(address, amount, READ_REGS);
uint8_t to_rec[MAX_MSG_LENGTH]; // <-- Transport layer dependent .. ?
ssize_t result = modbusReceive(to_rec);
if (result == -1)
{
setBadConnection();
return BAD_CON;
}
modbusErrorHandle(to_rec, READ_REGS);
if (err)
{
return err_no;
}
for (auto i = 0; i < amount; i++)
{
buffer[i] = ((uint16_t)to_rec[9u + 2u * i]) << 8u;
buffer[i] += (uint16_t)to_rec[10u + 2u * i];
}
return 0;
}
else
{
setBadConnection();
return BAD_CON;
}
}
int ModbusBase::readInputRegisters(uint16_t address, uint16_t amount, uint16_t *buffer)
{
if (m_connected)
{
modbusRead(address, amount, READ_INPUT_REGS);
uint8_t to_rec[MSG_MAX_LENGTH];
size_t result = modbusReceive(to_rec);
if (result == -1)
{
setBadConnection();
return BAD_CON;
}
modbusErrorHandle(to_rec, READ_INPUT_REGS);
if (err)
{
return err_no;
}
for (auto i = 0; i < amount; i++)
{
buffer[i] = ((uint16_t)to_rec[9u + 2u * i]) << 8u;
buffer[i] = (uint16_t)to_rec[10u + 2u * i];
}
return 0;
}
else
{
setBadConnection();
return BAD_CON;
}
}
int ModbusBase::writeCoil(uint16_t address, const bool &to_write)
{
if (m_connected)
{
int value = to_write * 0xFF00;
}
}
int ModbusBase::writeRegister(uint16_t address, const uint16_t &value)
{
}
int ModbusBase::writeCoils(uint16_t address, uint16_t amount, const bool *value)
{
}
int ModbusBase::writeRegisters(uint16_t address, uint16_t amount, const uint16_t *value)
{
}
void ModbusBase::buildRequest(uint8_t *to_send, uint16_t address, int function_code) const
{
to_send[0] = (uint8_t)(m_msg_id >> 8u);
to_send[1] = (uint8_t)(m_msg_id & 0x00FFu);
to_send[2] = 0;
to_send[3] = 0;
to_send[4] = 0;
to_send[6] = (uint8_t)m_slaveId;
to_send[7] = (uint8_t)function_code;
to_send[8] = (uint8_t)(address >> 8u);
to_send[9] = (uint8_t)(address & 0x00FFu);
}
int ModbusBase::modbusRead(uint16_t address, uint16_t amount, int function_code)
{
// TODO: Building the frames should be dependant on the chosen transport layer.. ( 256 for RTU, 260 for TCP )
// Declare as pure virtual and implement in the transport-specific class?
// For now we focus on TCP as it is easier to implement.
uint8_t to_send[12];
buildRequest(to_send, address, function_code);
to_send[5] = 6;
to_send[10] = (uint8_t)(amount >> 8u);
to_send[11] = (uint8_t)(amount & 0x00FFu);
return modbusSend(to_send, 12);
}
int ModbusBase::modbusWrite(uint16_t address, uint16_t amount, int function_code, const uint16_t *value)
{
// TODO: Building the frames should be dependant on the chosen transport layer.. ( 256 for RTU, 260 for TCP )
// Declare as pure virtual and implement in the transport-specific class?
// For now we focus on TCP as it is easier to implement.
int status = 0;
uint8_t *to_send;
switch (function_code)
{
// Intentionally fall-through
case WRITE_COIL:
case WRITE_REG:
{
to_send = new uint8_t[12];
buildRequest(to_send, address, function_code);
to_send[5] = 6;
to_send[10] = (uint8_t)(value[0] >> 8u);
to_send[11] = (uint8_t)(value[0] & 0x00FFu);
status = modbusSend(to_send, 12);
break;
}
case WRITE_REGS:
{
to_send = new uint8_t[13 + 2 * amount];
buildRequest(to_send, address, function_code);
to_send[5] = (uint8_t)(7 + 2 * amount);
to_send[10] = (uint8_t)(amount >> 8u);
to_send[11] = (uint8_t)(amount & 0x00FFu);
to_send[12] = (uint8_t)(2 * amount);
for (int i = 0; i < amount; i++)
{
to_send[13 + 2 * i] = (uint8_t)(value[i] >> 8u);
to_send[14 + 2 * i] = (uint8_t)(value[i] & 0x00FFu);
}
status = modbusSend(to_send, 13 + 2 * amount);
break;
}
case WRITE_COILS:
{
to_send = new uint8_t[14 + ( amount - 1 ) / 8];
buildRequest(to_send, address, function_code);
to_send[5] = (uint8_t)(7 + ( amount + 7 ) / 8);
to_send[10] = (uint8_t)(amount >> 8u);
to_send[11] = (uint8_t)(amount & 0x00FFu);
to_send[12] = (uint8_t)((amount + 7) / 8);
for (int i = 0; i < (amount + 7) / 8; i++)
{
to_send[13 + i] = 0 // Init needed before summing.
}
for (int i = 0; i < amount; i++)
{
to_send[13 + i / 8] += (uint8_t)(value[i] << (i % 8u));
}
status = modbusSend(to_send, 13 + (amount - 1) / 8);
}
}
delete[] to_send;
return status;
}
ssize_t ModbusBase::modbusSend(uint8_t *to_send, size_t length)
{
}
ssize_t ModbusBase::modbusReceive(uint8_t *buffer) const
{
}
void ModbusBase::modbusErrorHandle(const uint8_t *msg, int function_code)
{
}
void ModbusBase::setBadConnection()
{
}
void ModbusBase::setBadInput()
{
}