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sumit4271
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Hello All,
Iam trying to develop an USB Communication application in VB.Net in which My VB application will communicate with the microcontroller via USB communication. The controller chip is a TI product and they have given the required .DLL file for USB communication.
I have an example code of visual studio but it is a command line application written in Windows C language.
Iam having trouble in porting the code of Cmd application into vb.net .
I'am taking reference from J.Axelson book USB COMPLETE.
Can I include header files in vb.net application? Cmd Application code is given below
I want to understand the flowdiagram of the code needed to written in vb.net application
//*****************************************************************************
//
// usb_bulk_example.c - A very simple command line application that attempts
// to open the Generic Bulk USB device and exchange data with it.
//
//
//
//*****************************************************************************
//****************************************************************************
//
// If the device is successfully opened, the user is prompted for a string
// which is then sent to the device. The device toggles the case of any
// alphabet characters in the the data and sends it back. We receive this
// and print out the result.
//
// Communication with the device is carried out via a simple DLL, lmusbdll(64),
// which is responsible for opening and closing the device and for
// sending and receiving blocks of data. This structure allows the
// application code to be kept independent of the underlying USB driver
// in use. In this implementation, Microsoft's WinUSB interface is used
// but a switch to another stack, for example the open source libusb-win32
// interface could be made merely be replacing the lmusbdll(64).dll with
// another version writing to the different USB stack.
//
// One downside to using WinUSB is that it requires you to have the Windows
// Device Driver Kit (DDK) installed to build applications which use the
// interface. This is a very large download making it awkward for people
// with slow internet connections. The use of lmusbdll(64).dll also offers
// the advantage that applications using it can still be modified and
// rebuilt even without the DDK installed on the development system. To
// update and rebuild lmusbdll itself, however, the DDK is still required.
//
//****************************************************************************
#include <windows.h>
#include <strsafe.h>
#include <initguid.h>
#include "lmusbdll.h"
#include "tiva_guids.h"
//****************************************************************************
//
// Buffer size definitions.
//
//****************************************************************************
#define MAX_STRING_LEN 256
#define MAX_ENTRY_LEN 256
#define USB_BUFFER_LEN 1216
//****************************************************************************
//
// The build version number
//
//****************************************************************************
#define BLDVER "2.1.0.12573"
//****************************************************************************
//
// The number of bytes we read and write per transaction if in echo mode.
//
//****************************************************************************
#define ECHO_PACKET_SIZE 64
//****************************************************************************
//
// Buffer into which error messages are written.
//
//****************************************************************************
TCHAR g_pcErrorString[MAX_STRING_LEN];
//****************************************************************************
//
// The number of bytes transfered in the last measurement interval.
//
//****************************************************************************
ULONG g_ulByteCount = 0;
//****************************************************************************
//
// The total number of packets transfered.
//
//****************************************************************************
ULONG g_ulPacketCount = 0;
//****************************************************************************
//
// Return a string describing the supplied system error code.
//
// \param dwError is a Windows system error code.
//
// This function returns a pointer to a string describing the error code
// passed in the dwError parameter. If no description string can be found
// the string "Unknown" is returned.
//
// \return Returns a pointer to a string describing the error.
//
//****************************************************************************
LPTSTR GetSystemErrorString(DWORD dwError)
{
DWORD dwRetcode;
//
// Ask Windows for the error message description.
//
dwRetcode = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, "%0", dwError, 0,
g_pcErrorString, MAX_STRING_LEN, NULL);
if(dwRetcode == 0)
{
return((LPTSTR)L"Unknown");
}
else
{
//
// Remove the trailing "\n\r" if present.
//
if(dwRetcode >= 2)
{
if(g_pcErrorString[dwRetcode - 2] == '\r')
{
g_pcErrorString[dwRetcode - 2] = '\0';
}
}
return(g_pcErrorString);
}
}
//****************************************************************************
//
// Print the throughput in terms of Kbps once per second.
//
//****************************************************************************
void UpdateThroughput(void)
{
static ULONG ulStartTime = 0;
static ULONG ulLast = 0;
ULONG ulNow;
ULONG ulElapsed;
SYSTEMTIME sSysTime;
//
// Get the current system time.
//
GetSystemTime(&sSysTime);
ulNow = (((((sSysTime.wHour * 60) +
sSysTime.wMinute) * 60) +
sSysTime.wSecond) * 1000) + sSysTime.wMilliseconds;
//
// If this is the first call, set the start time.
//
if(ulStartTime == 0)
{
ulStartTime = ulNow;
ulLast = ulNow;
return;
}
//
// How much time has elapsed since the last measurement?
//
ulElapsed = (ulNow > ulStartTime) ? (ulNow - ulStartTime) : (ulStartTime - ulNow);
//
// We dump a new measurement every second.
//
if(ulElapsed > 1000)
{
//printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
printf("\r%6dKbps Packets: %10d ", ((g_ulByteCount * 8) / ulElapsed), g_ulPacketCount);
g_ulByteCount = 0;
ulStartTime = ulNow;
}
}
//****************************************************************************
//
// The main application entry function.
//
// \param None.
//
// This function forms the main entry point of the example application. It
// initializes the USB bulk device, prompts the user for an ASCII string,
// sends this string to the device, reads the response from the device (which
// will be the same string with the character order reversed if using the
// sample device provided in TivaWare) and displays the returned string.
//
// \return Set the exit code to 0 of no errors cause the application to end
// or a non-zero value otherwise.
//
//****************************************************************************
int main(int argc, char *argv[])
{
BOOL bResult;
BOOL bDriverInstalled;
BOOL bEcho;
char szBuffer[USB_BUFFER_LEN];
ULONG ulWritten;
ULONG ulRead;
ULONG ulLength;
DWORD dwError;
LMUSB_HANDLE hUSB;
//
// Are we operating in echo mode or not? The "-e" parameter tells the
// app to echo everything it receives back to the device unchanged.
//
bEcho = ((argc > 1) && (argv[1][1] == 'e')) ? TRUE : FALSE;
//
// Print a cheerful welcome.
//
printf("\nBulk USB Device Example\n");
printf( "-----------------------\n\n");
printf("Version %s\n\n", BLDVER);
if(!bEcho)
{
printf("This is a partner application to the usb_dev_bulk example\n");
printf("shipped with TivaWare software releases for USB-enabled\n");
printf("boards. Strings entered here are sent to the board which\n");
printf("inverts the case of the characters in the string and returns\n");
printf("them to the host.\n\n");
}
else
{
printf("If run with the \"-e\" command line switch, this application\n");
printf("echoes all data received on the bulk IN endpoint to the bulk\n");
printf("OUT endpoint. This feature may be helpful during development\n");
printf("and debug of your own USB devices. Note that this will not\n");
printf("do anything exciting if run with the usb_dev_bulk example\n");
printf("device attached since it expects the host to initiate transfers.\n\n");
}
//
// Find our USB device and prepare it for communication.
//
hUSB = InitializeDevice(BULK_VID, BULK_PID,
(LPGUID)&(GUID_DEVINTERFACE_TIVA_BULK),
&bDriverInstalled);
if(hUSB)
{
//
// Are we operating in echo mode or not? The "-e" parameter tells the
// app to echo everything it receives back to the device unchanged.
//
if(bEcho)
{
//
// Yes - we are in echo mode.
//
printf("Running in echo mode. Press Ctrl+C to exit.\n\n");
while(1)
{
//
// Read a block of data from the device.
//
dwError = ReadUSBPacket(hUSB, szBuffer, ECHO_PACKET_SIZE, &ulRead,
INFINITE, NULL);
if(dwError != ERROR_SUCCESS)
{
//
// We failed to read from the device.
//
printf("\n\nError %d (%S) reading from bulk IN pipe.\n", dwError,
GetSystemErrorString(dwError));
break;
}
else
{
//
// Update our byte and packet counters.
//
g_ulByteCount += ulRead;
g_ulPacketCount++;
//
// Write the data back out to the device.
//
bResult = WriteUSBPacket(hUSB, szBuffer, ulRead, &ulWritten);
if(!bResult)
{
//
// We failed to write the data for some reason.
//
dwError = GetLastError();
printf("\n\nError %d (%S) writing to bulk OUT pipe.\n", dwError,
GetSystemErrorString(dwError));
break;
}
//
// Display the throughput.
//
UpdateThroughput();
}
}
}
else
{
//
// We are running in normal mode. Keep sending and receiving
// strings until the user indicates that it is time to exit.
//
while(1)
{
//
// The device was found and successfully configured. Now get a string from
// the user...
//
do
{
printf("\nEnter a string (EXIT to exit): ");
fgets(szBuffer, MAX_ENTRY_LEN, stdin);
printf("\n");
//
// How many characters were entered (including the trailing '\n')?
//
ulLength = (ULONG)strlen(szBuffer);
if(ulLength <= 1)
{
//
// The string is either nothing at all or a single '\n' so reprompt the user.
//
printf("\nPlease enter some text.\n");
ulLength = 0;
}
else
{
//
// Get rid of the trailing '\n' if there is one there.
//
if(szBuffer[ulLength - 1] == '\n')
{
szBuffer[ulLength - 1] = '\0';
ulLength--;
}
}
}
while(ulLength == 0);
//
// Are we being asked to exit the application?
//
if(!(strcmp("EXIT", szBuffer)))
{
//
// Yes - drop out and exit.
//
printf("Exiting on user request.\n");
break;
}
//
// Write the user's string to the device.
//
bResult = WriteUSBPacket(hUSB, szBuffer, ulLength, &ulWritten);
if(!bResult)
{
//
// We failed to write the data for some reason.
//
dwError = GetLastError();
printf("Error %d (%S) writing to bulk OUT pipe.\n", dwError,
GetSystemErrorString(dwError));
}
else
{
//
// We wrote data successfully so now read it back.
//
printf("Wrote %d bytes to the device. Expected %d\n",
ulWritten, ulLength);
//
// We expect the same number of bytes as we just sent.
//
dwError = ReadUSBPacket(hUSB, szBuffer, ulWritten, &ulRead,
INFINITE, NULL);
if(dwError != ERROR_SUCCESS)
{
//
// We failed to read from the device.
//
printf("Error %d (%S) reading from bulk IN pipe.\n", dwError,
GetSystemErrorString(dwError));
}
else
{
//
// Add a string terminator to the returned data (this
// should already be there but, just in case...)
//
szBuffer[ulRead] = '\0';
printf("Read %d bytes from device. Expected %d\n",
ulRead, ulWritten);
printf("\nReturned string: \"%s\"\n", szBuffer);
}
}
}
}
}
else
{
//
// An error was reported while trying to connect to the device.
//
dwError = GetLastError();
printf("\nUnable to initialize the Bulk USB Device.\n");
printf("Error code is %d (%S)\n\n", dwError, GetSystemErrorString(dwError));
printf("Please make sure you have a USB-enabled Tiva evaluation\n");
printf("or development kit running the usb_dev_bulk example\n");
printf("application connected to this system via the \"USB OTG\" or\n");
printf("\"USB DEVICE\" connectors. Once the device is connected, run\n");
printf("this application again.\n\n");
printf("\nPress \"Enter\" to exit: ");
fgets(szBuffer, MAX_STRING_LEN, stdin);
printf("\n");
return(2);
}
TerminateDevice(hUSB);
return(0);
}
Continue reading...
Iam trying to develop an USB Communication application in VB.Net in which My VB application will communicate with the microcontroller via USB communication. The controller chip is a TI product and they have given the required .DLL file for USB communication.
I have an example code of visual studio but it is a command line application written in Windows C language.
Iam having trouble in porting the code of Cmd application into vb.net .
I'am taking reference from J.Axelson book USB COMPLETE.
Can I include header files in vb.net application? Cmd Application code is given below
I want to understand the flowdiagram of the code needed to written in vb.net application
//*****************************************************************************
//
// usb_bulk_example.c - A very simple command line application that attempts
// to open the Generic Bulk USB device and exchange data with it.
//
//
//
//*****************************************************************************
//****************************************************************************
//
// If the device is successfully opened, the user is prompted for a string
// which is then sent to the device. The device toggles the case of any
// alphabet characters in the the data and sends it back. We receive this
// and print out the result.
//
// Communication with the device is carried out via a simple DLL, lmusbdll(64),
// which is responsible for opening and closing the device and for
// sending and receiving blocks of data. This structure allows the
// application code to be kept independent of the underlying USB driver
// in use. In this implementation, Microsoft's WinUSB interface is used
// but a switch to another stack, for example the open source libusb-win32
// interface could be made merely be replacing the lmusbdll(64).dll with
// another version writing to the different USB stack.
//
// One downside to using WinUSB is that it requires you to have the Windows
// Device Driver Kit (DDK) installed to build applications which use the
// interface. This is a very large download making it awkward for people
// with slow internet connections. The use of lmusbdll(64).dll also offers
// the advantage that applications using it can still be modified and
// rebuilt even without the DDK installed on the development system. To
// update and rebuild lmusbdll itself, however, the DDK is still required.
//
//****************************************************************************
#include <windows.h>
#include <strsafe.h>
#include <initguid.h>
#include "lmusbdll.h"
#include "tiva_guids.h"
//****************************************************************************
//
// Buffer size definitions.
//
//****************************************************************************
#define MAX_STRING_LEN 256
#define MAX_ENTRY_LEN 256
#define USB_BUFFER_LEN 1216
//****************************************************************************
//
// The build version number
//
//****************************************************************************
#define BLDVER "2.1.0.12573"
//****************************************************************************
//
// The number of bytes we read and write per transaction if in echo mode.
//
//****************************************************************************
#define ECHO_PACKET_SIZE 64
//****************************************************************************
//
// Buffer into which error messages are written.
//
//****************************************************************************
TCHAR g_pcErrorString[MAX_STRING_LEN];
//****************************************************************************
//
// The number of bytes transfered in the last measurement interval.
//
//****************************************************************************
ULONG g_ulByteCount = 0;
//****************************************************************************
//
// The total number of packets transfered.
//
//****************************************************************************
ULONG g_ulPacketCount = 0;
//****************************************************************************
//
// Return a string describing the supplied system error code.
//
// \param dwError is a Windows system error code.
//
// This function returns a pointer to a string describing the error code
// passed in the dwError parameter. If no description string can be found
// the string "Unknown" is returned.
//
// \return Returns a pointer to a string describing the error.
//
//****************************************************************************
LPTSTR GetSystemErrorString(DWORD dwError)
{
DWORD dwRetcode;
//
// Ask Windows for the error message description.
//
dwRetcode = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, "%0", dwError, 0,
g_pcErrorString, MAX_STRING_LEN, NULL);
if(dwRetcode == 0)
{
return((LPTSTR)L"Unknown");
}
else
{
//
// Remove the trailing "\n\r" if present.
//
if(dwRetcode >= 2)
{
if(g_pcErrorString[dwRetcode - 2] == '\r')
{
g_pcErrorString[dwRetcode - 2] = '\0';
}
}
return(g_pcErrorString);
}
}
//****************************************************************************
//
// Print the throughput in terms of Kbps once per second.
//
//****************************************************************************
void UpdateThroughput(void)
{
static ULONG ulStartTime = 0;
static ULONG ulLast = 0;
ULONG ulNow;
ULONG ulElapsed;
SYSTEMTIME sSysTime;
//
// Get the current system time.
//
GetSystemTime(&sSysTime);
ulNow = (((((sSysTime.wHour * 60) +
sSysTime.wMinute) * 60) +
sSysTime.wSecond) * 1000) + sSysTime.wMilliseconds;
//
// If this is the first call, set the start time.
//
if(ulStartTime == 0)
{
ulStartTime = ulNow;
ulLast = ulNow;
return;
}
//
// How much time has elapsed since the last measurement?
//
ulElapsed = (ulNow > ulStartTime) ? (ulNow - ulStartTime) : (ulStartTime - ulNow);
//
// We dump a new measurement every second.
//
if(ulElapsed > 1000)
{
//printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
printf("\r%6dKbps Packets: %10d ", ((g_ulByteCount * 8) / ulElapsed), g_ulPacketCount);
g_ulByteCount = 0;
ulStartTime = ulNow;
}
}
//****************************************************************************
//
// The main application entry function.
//
// \param None.
//
// This function forms the main entry point of the example application. It
// initializes the USB bulk device, prompts the user for an ASCII string,
// sends this string to the device, reads the response from the device (which
// will be the same string with the character order reversed if using the
// sample device provided in TivaWare) and displays the returned string.
//
// \return Set the exit code to 0 of no errors cause the application to end
// or a non-zero value otherwise.
//
//****************************************************************************
int main(int argc, char *argv[])
{
BOOL bResult;
BOOL bDriverInstalled;
BOOL bEcho;
char szBuffer[USB_BUFFER_LEN];
ULONG ulWritten;
ULONG ulRead;
ULONG ulLength;
DWORD dwError;
LMUSB_HANDLE hUSB;
//
// Are we operating in echo mode or not? The "-e" parameter tells the
// app to echo everything it receives back to the device unchanged.
//
bEcho = ((argc > 1) && (argv[1][1] == 'e')) ? TRUE : FALSE;
//
// Print a cheerful welcome.
//
printf("\nBulk USB Device Example\n");
printf( "-----------------------\n\n");
printf("Version %s\n\n", BLDVER);
if(!bEcho)
{
printf("This is a partner application to the usb_dev_bulk example\n");
printf("shipped with TivaWare software releases for USB-enabled\n");
printf("boards. Strings entered here are sent to the board which\n");
printf("inverts the case of the characters in the string and returns\n");
printf("them to the host.\n\n");
}
else
{
printf("If run with the \"-e\" command line switch, this application\n");
printf("echoes all data received on the bulk IN endpoint to the bulk\n");
printf("OUT endpoint. This feature may be helpful during development\n");
printf("and debug of your own USB devices. Note that this will not\n");
printf("do anything exciting if run with the usb_dev_bulk example\n");
printf("device attached since it expects the host to initiate transfers.\n\n");
}
//
// Find our USB device and prepare it for communication.
//
hUSB = InitializeDevice(BULK_VID, BULK_PID,
(LPGUID)&(GUID_DEVINTERFACE_TIVA_BULK),
&bDriverInstalled);
if(hUSB)
{
//
// Are we operating in echo mode or not? The "-e" parameter tells the
// app to echo everything it receives back to the device unchanged.
//
if(bEcho)
{
//
// Yes - we are in echo mode.
//
printf("Running in echo mode. Press Ctrl+C to exit.\n\n");
while(1)
{
//
// Read a block of data from the device.
//
dwError = ReadUSBPacket(hUSB, szBuffer, ECHO_PACKET_SIZE, &ulRead,
INFINITE, NULL);
if(dwError != ERROR_SUCCESS)
{
//
// We failed to read from the device.
//
printf("\n\nError %d (%S) reading from bulk IN pipe.\n", dwError,
GetSystemErrorString(dwError));
break;
}
else
{
//
// Update our byte and packet counters.
//
g_ulByteCount += ulRead;
g_ulPacketCount++;
//
// Write the data back out to the device.
//
bResult = WriteUSBPacket(hUSB, szBuffer, ulRead, &ulWritten);
if(!bResult)
{
//
// We failed to write the data for some reason.
//
dwError = GetLastError();
printf("\n\nError %d (%S) writing to bulk OUT pipe.\n", dwError,
GetSystemErrorString(dwError));
break;
}
//
// Display the throughput.
//
UpdateThroughput();
}
}
}
else
{
//
// We are running in normal mode. Keep sending and receiving
// strings until the user indicates that it is time to exit.
//
while(1)
{
//
// The device was found and successfully configured. Now get a string from
// the user...
//
do
{
printf("\nEnter a string (EXIT to exit): ");
fgets(szBuffer, MAX_ENTRY_LEN, stdin);
printf("\n");
//
// How many characters were entered (including the trailing '\n')?
//
ulLength = (ULONG)strlen(szBuffer);
if(ulLength <= 1)
{
//
// The string is either nothing at all or a single '\n' so reprompt the user.
//
printf("\nPlease enter some text.\n");
ulLength = 0;
}
else
{
//
// Get rid of the trailing '\n' if there is one there.
//
if(szBuffer[ulLength - 1] == '\n')
{
szBuffer[ulLength - 1] = '\0';
ulLength--;
}
}
}
while(ulLength == 0);
//
// Are we being asked to exit the application?
//
if(!(strcmp("EXIT", szBuffer)))
{
//
// Yes - drop out and exit.
//
printf("Exiting on user request.\n");
break;
}
//
// Write the user's string to the device.
//
bResult = WriteUSBPacket(hUSB, szBuffer, ulLength, &ulWritten);
if(!bResult)
{
//
// We failed to write the data for some reason.
//
dwError = GetLastError();
printf("Error %d (%S) writing to bulk OUT pipe.\n", dwError,
GetSystemErrorString(dwError));
}
else
{
//
// We wrote data successfully so now read it back.
//
printf("Wrote %d bytes to the device. Expected %d\n",
ulWritten, ulLength);
//
// We expect the same number of bytes as we just sent.
//
dwError = ReadUSBPacket(hUSB, szBuffer, ulWritten, &ulRead,
INFINITE, NULL);
if(dwError != ERROR_SUCCESS)
{
//
// We failed to read from the device.
//
printf("Error %d (%S) reading from bulk IN pipe.\n", dwError,
GetSystemErrorString(dwError));
}
else
{
//
// Add a string terminator to the returned data (this
// should already be there but, just in case...)
//
szBuffer[ulRead] = '\0';
printf("Read %d bytes from device. Expected %d\n",
ulRead, ulWritten);
printf("\nReturned string: \"%s\"\n", szBuffer);
}
}
}
}
}
else
{
//
// An error was reported while trying to connect to the device.
//
dwError = GetLastError();
printf("\nUnable to initialize the Bulk USB Device.\n");
printf("Error code is %d (%S)\n\n", dwError, GetSystemErrorString(dwError));
printf("Please make sure you have a USB-enabled Tiva evaluation\n");
printf("or development kit running the usb_dev_bulk example\n");
printf("application connected to this system via the \"USB OTG\" or\n");
printf("\"USB DEVICE\" connectors. Once the device is connected, run\n");
printf("this application again.\n\n");
printf("\nPress \"Enter\" to exit: ");
fgets(szBuffer, MAX_STRING_LEN, stdin);
printf("\n");
return(2);
}
TerminateDevice(hUSB);
return(0);
}
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