C / C++ / MFC

MakeGetStatusCMD()

BOOL SysUsartBusy;//combining the functions of a data bus to carry information, an address bus to determine where it should be sent or read from, and a control bus to determine its operation.
WORD SysCmdTimeoutCount;//Byte and Word Swapping in Modbus, proposes a method to timeout a long-running command .
WORD SysCmdAckDelayCount;// system acknowledged, puting a delay count 
WORD SysCmdDelayCount; // delay will counted 
//The tail() method is utilized to return a new queue that consists of all the elements except the first one.
BYTE CmdQueueHeader, CmdQueueTail;// In modbus data stream at first (flag, adress, control) belongs from a header file,Returns the queue of upcoming commands for the specified device. 
BYTE CmdQueue[CMD_QUEUE_SIZE];//Queue is a function, may be its use for checking 1st and last data within a particular size.

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CMD commands are an antiquated and mostly unnecessary tool from an era of text-based input

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Under this function, float type WORDS and size are defined .

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void CModebusTCP::OnReceived(BYTE *pData, int nSize)

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void MakeGetStatusCMD(void)
{
WORD *pWord;
float *pFloat;
WORD Size;

pWord = (WORD*)Uart1.TxData;


pWord[0] = DSP_CMD_GETTATUS;
pWord[1] = g_AdjustOutput;
pWord[2] = g_RunMode;
pWord[3] = g_Run;

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This code fragment contains some global variables, we cannot see how they are declared, initialized and probably used somewhere else

in_data = Register[CH1_VOLTAGE] * 1000 - Vfilt_16;

#define PI_DEFAULTS { 1.0f, \
0.0f, \
0.0f, \
1.0f, \
-1.0f, \
1.0f \
}

Md Mubdiul Hasan wrote:

1. Subtract AND assignment operator, what -= means ?
2. what += means ?

Md Mubdiul Hasan wrote:

3. What does !=0 means in if structure ?
4. What double equals == means ?

TranslateAccelerator(

BOOL CPreTransTestApp::ProcessMessageFilter(int code, LPMSG lpMsg) 
{
    if(m_haccel)
    {
        if (::TranslateAccelerator(m_pMainWnd->m_hWnd, m_haccel, lpMsg)) 
            return(TRUE);
    }
	
    return CWinApp::ProcessMessageFilter(code, lpMsg);
}

MSG msg;
BOOL bRet;

while ( (bRet = GetMessage(&msg, (HWND) NULL, 0, 0)) != 0)
{
    if (bRet == -1) 
    {
        // handle the error and possibly exit
    }
    else
    { 
        // Check for accelerator keystrokes. 
     
        if (!TranslateAccelerator( 
                hwndMain,      // handle to receiving window 
                haccel,        // handle to active accelerator table 
                &msg))         // message data 
        {
            TranslateMessage(&msg); 
            DispatchMessage(&msg); 
        } 
    } 
}