Arm USB communication

Part of oscilloscope Development

The dynamic link library of zlg is used for dynamic loading.

Arm is Context-M3-1343.

PC communication software developed in C ++ Builder 6.

The USB communication code is as follows:

// ----------------------------------------------------------------------------- </P> <p> # include <VCL. h> <br/> # pragma hdrstop </P> <p> # include "unit1.h" <br/> // # include "zyusbdev. H "</P> <p> // usage <br/> # pragma package (smart_init) <br/> # pragma resource "*. DFM "<br/> tform1 * form1; <br/> //--------------------------------------------------- ------------------------ <Br/>__ fastcall tform1: tform1 (tcomponent * owner) <br/>: tform (owner) <br/>{< br/>}< br/> // signature </P> <p> void _ fastcall tform1: button1click (tobject * sender) <br/>{< br/> unsigned char sendbuf [1024], recbuf [1024]; <br/> int I; </P> <p> unsigned char inbyte; <br/> for (I = 0; I <sizeof (sendbuf); I ++) <br/> {<Br/> sendbuf [I] = inbyte; // 4096 bytes in the sending buffer in hexadecimal notation <br/> recbuf [I] = 0; // clear the receiving buffer <br/>}</P> <p> /*********************. dynamic library ***********************/<br/> int ret; <br/> ansistring m_disp = "China"; <br/> unsigned char cmd [2], ack; <br/> cmd [0] = sizeof (sendbuf)/256; // The length of the number of bytes to be sent is 8 bits <br/> cmd [1] = sizeof (sendbuf) % 256; // 8-bit lower </P> <p> hinstance handle; <br/> farproc lpfarproc; <br/> in T _ stdcall (* pfun) (INT, unsigned char *, Int, INT); // change </P> <p> handle = loadlibrary ("zyusbdev. DLL "); <br/> lpfarproc = getprocaddress (handle," zyusb_readdata "); <br/> pfun = (INT (_ stdcall *) (INT, unsigned char *, int, INT) lpfarproc; // _ cdecl </P> <p> // Step 5: Use logical endpoint 2, receives a large amount of data from a USB device <br/> ret = pfun (2, recbuf, sizeof (sendbuf), 1000); <br/> If (Ret! = Sizeof (sendbuf) <br/>{< br/> If (Ret <= 0) <br/>{< br/> m_disp = "logical endpoint 2 receive data error: no valid data is received. "; <Br/>}< br/> else if (Ret> 0) <br/>{< br/> m_disp =" error in receiving data from logical endpoint 2: some data is received. "; <Br/>}</P> <p> // MessageBox (" logical endpoint 2 receives data error "); <br/> return; <br/>}</P> <p> // display received bytes <br/> m_disp = ""; <br/> int temp = 0; <br/> temp = recbuf [0] + recbuf [1] * 256; <br/> m_disp = inttostr (temp) + ""; <br/> for (I = 0; I <sizeof (sendbuf); I ++) <br/> m_disp = m_disp + recbuf [I] + ""; </P> <p> memo1-> text = m_disp; <br/> freelibrary (handle); <br/>}< br/> // handle <br/>

For details, see www.jxust3jia1.com, which describes the oscilloscope project.