ARM USB Communication

Use ZLG's dynamic link library for dynamic loading.

ARM is Context-M3-1343.

Host computer communication software developed in C++ Builder 6.

The USB communication code is as follows:

//---------------------------------------------------------------------------

#include

#pragma hdrstop

#include "Unit1.h"

//#include "zyUSBDev.h"

//---------------------------------------------------------------------------

#pragma package(smart_init)

#pragma resource "*.dfm"

TForm1 *Form1;

//---------------------------------------------------------------------------

__fastcall TForm1::TForm1(TComponent* Owner)

        : TForm(Owner)

{

}

//---------------------------------------------------------------------------

void __fastcall TForm1::Button1Click(TObject *Sender)

{

    unsigned char sendbuf[1024],recbuf[1024];

    int i;

    unsigned char Substitution;

    for (i = 0; i < sizeof(sendbuf); i++)

    {

        sendbuf[i] = Inbyte; //Put the hexadecimal byte into the send buffer 4096 bytes

        recbuf[i] = 0; // Clear the receive buffer

    }

    /******************* Let's start using the dynamic library **************************/

    int ret;

    AnsiString m_Disp = " china";

    unsigned char cmd[2],ack;

    cmd[0] = sizeof(sendbuf) / 256; //The high 8 bits of the length of the number of bytes to be sent

    cmd[1] = sizeof(sendbuf) % 256; // lower 8 bits

    HINSTANCE handle;

    FARPROC lpFarProc;

    int __stdcall (*pFun)(int,unsigned char*,int,int);//change

    handle = LoadLibrary("zyUSBDev.dll");

    lpFarProc = GetProcAddress(handle, "zyUSB_ReadData");

    pFun = (int(__stdcall*)(int,unsigned char*,int,int))lpFarProc;  //__cdecl

    //Step 5: Use logical endpoint 2 to receive a large amount of data from the USB device

    ret = pFun(2, recbuf, sizeof(sendbuf), 1000);

    if (ret != sizeof(sendbuf))

    {

        if (ret <= 0)

        {

            m_Disp = "Logical endpoint 2 receive data error: No valid data was received.";

        }

        else if (ret > 0)

        {

            m_Disp = "Logical endpoint 2 receive data error: Partial data received.";

        }

        // MessageBox("Logical endpoint 2 receiving data error");

        return;

    }

    // Display the received bytes

    m_Disp = "";

    int temp = 0;

    temp = recbuf[0] + recbuf[1] * 256;

    m_Disp= IntToStr(temp) + " ";

    for (i = 0; i < sizeof(sendbuf); i++)

        m_Disp = m_Disp + recbuf[i] + " ";

    Memo1->Text = m_Disp;

    FreeLibrary(handle);

}

//---------------------------------------------------------------------------