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   源码介绍

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Modbus TCP主从C 例程

Modbus TCP主从C 例程

/**
 * @brief Write Request Builder and Sender
 * @param address   Reference Address
 * @param amount    Amount of data to be Written
 * @param func      Modbus Functional Code
 * @param value     Data to Be Written
 */
void mbTcpMaster::_modbus_write(int address, int amount, int func, uint16_t *value)
{
    if(func == MB_FCT_WRITE_SING_OUTPUT || func == MB_FCT_WRITE_SING_REG)
    {
        uint8_t to_send[12];
        _build_header(to_send, address, func);
        to_send[5] = 6;
        to_send[10] = (uint8_t) (value[0] >> 8);
        to_send[11] = (uint8_t) (value[0] & 0x00FF);
        _eth->send(to_send, 12);
    }
    else if(func == MB_FCT_WRITE_MULT_REGS)
    {
        uint8_t to_send[13 2 * amount];
        _build_header(to_send, address, func);
        to_send[5] = (uint8_t) (7 2 * amount);
        to_send[10] = (uint8_t) (amount >> 8);
        to_send[11] = (uint8_t) (amount & 0x00FF);
        to_send[12] = (uint8_t) (2 * amount);
        for(int i = 0; i < amount; i )
        {
            to_send[13 2 * i] = (uint8_t) (value[i] >> 8);
            to_send[14 2 * i] = (uint8_t) (value[i] & 0x00FF);
        }
        _eth->send(to_send, 13 2 * amount);
    }
    else if(func == MB_FCT_WRITE_MULT_COILS)
    {
        uint8_t to_send[14 (amount -1) / 8 ];
        _build_header(to_send, address, func);
        to_send[10] = (uint8_t) (amount >> 8); //Bit Count
        to_send[11] = (uint8_t) (amount & 0x00FF);
        to_send[12] = (uint8_t) ((amount 7) / 8);//Byte Count
        to_send[5]  = (uint8_t) (7 to_send[12]);
        for(int i = 0, idx = 0; i < amount; i )
        {
            idx = 13 (i - 1) / 8;
            if(!(i % 8))
            {
                to_send[idx] = 0;
            }
            to_send[idx] = (uint8_t) (value[i] << (i % 8));
        }
        _eth->send(to_send, 14 (amount - 1) / 8);
    }
}

.
├── MBmemory.cpp
├── MBmemory.h
├── MemInterface.h
├── mbTcpMaster.cpp
├── mbTcpMaster.h
├── mbTcpSlave.cpp
├── mbTcpSlave.h
├── modbus_common.h
├── modbus_exception.h
└── 好例子网_Modbus TCP主从 C .zip

0 directories, 10 files