PEAK-System Forum

Hello!

I have a problem when communicating with PCAN-USB adapter which is connected to
J1939 simulator. The device was set to use RP1210 in PCAN Nets utility and I can
view data from it using PcanView.

I am writing a Qt-based program. I successfuly loaded PCANRP32.dll and exported
API functions from this library. A call to RP1210_ReadVersion was succesful. But
when I call RP1210_ClientConnect it returns error 142.

What's wrong with my program?

The program text is below:

Code: Select all

#include <QApplication>
#include <QtCore>
#include <windows.h>
#include <iostream>
#include "PCAN_RP1210.h"


typedef short (__stdcall *tfn_RP1210_ClientConnect) ( HWND, short, char *, long, long, short );
typedef short (__stdcall *tfn_RP1210_ClientDisconnect) ( short );
typedef short (__stdcall *tfn_RP1210_SendMessage) ( short, char*, short, short, short );
typedef short (__stdcall *tfn_RP1210_ReadMessage) ( short, char*, short, short );
typedef short (__stdcall *tfn_RP1210_SendCommand) ( short, short, char*, short );
typedef void  (__stdcall *tfn_RP1210_ReadVersion) ( char*, char*, char*, char* );
typedef short (__stdcall *tfn_RP1210_GetErrorMsg) ( short, char* );
typedef short (__stdcall *tfn_RP1210_GetHardwareStatus) ( short, char*, short, short );


typedef struct 
{
  tfn_RP1210_ClientConnect      RP1210_ClientConnect;
  tfn_RP1210_ClientDisconnect   RP1210_ClientDisconnect;
  tfn_RP1210_SendMessage        RP1210_SendMessage;
  tfn_RP1210_ReadMessage        RP1210_ReadMessage;
  tfn_RP1210_SendCommand        RP1210_SendCommand;
  tfn_RP1210_ReadVersion        RP1210_ReadVersion;
  tfn_RP1210_GetErrorMsg        RP1210_GetErrorMsg;
  tfn_RP1210_GetHardwareStatus  RP1210_GetHardwareStatus;
}
device_api_t;

device_api_t api;


QString getErrorDescription( short errorCode )
{
  QString res;
  char dscr[ 2048 ];

  short code = api.RP1210_GetErrorMsg( errorCode, dscr );
  if( code == NO_ERRORS )
    res = QString( "%1 (%2)" ).arg( QString::fromLatin1( dscr ) ).arg( errorCode );
  else
    std::cout << "Error translation failed:" << code << std::endl;

  return res;
}




int main( int argc, char *argv[] )
{
  QLibrary l( "PCANRP32.dll" );

  api.RP1210_ClientConnect = (tfn_RP1210_ClientConnect)l.resolve( "RP1210_ClientConnect" );
  api.RP1210_ClientDisconnect = (tfn_RP1210_ClientDisconnect)l.resolve( "RP1210_ClientDisconnect" );
  api.RP1210_SendMessage = (tfn_RP1210_SendMessage)l.resolve( "RP1210_SendMessage" );
  api.RP1210_ReadMessage = (tfn_RP1210_ReadMessage)l.resolve( "RP1210_ReadMessage" );
  api.RP1210_SendCommand = (tfn_RP1210_SendCommand)l.resolve( "RP1210_SendCommand" );
  api.RP1210_ReadVersion = (tfn_RP1210_ReadVersion)l.resolve( "RP1210_ReadVersion" );
  api.RP1210_GetErrorMsg = (tfn_RP1210_GetErrorMsg)l.resolve( "RP1210_GetErrorMsg" );
  api.RP1210_GetHardwareStatus = (tfn_RP1210_GetHardwareStatus)l.resolve( "RP1210_GetHardwareStatus" );

  if( !( api.RP1210_ClientConnect
         && api.RP1210_ClientDisconnect
         && api.RP1210_SendMessage
         && api.RP1210_ReadMessage
         && api.RP1210_SendCommand
         && api.RP1210_ReadVersion
         && api.RP1210_GetErrorMsg
         && api.RP1210_GetHardwareStatus )
  )
  {
    std::cout << "Api not resolved" << std::endl;
    return 1;
  }

  char dllMajor[50];
  char dllMinor[50];
  char apiMajor[50];
  char apiMinor[50];

  api.RP1210_ReadVersion( dllMajor, dllMinor, apiMajor, apiMinor );
  std::cout << "DLL version: " << dllMajor << "." << dllMinor << std::endl;
  std::cout << "API version: " << apiMajor << "." << apiMinor << std::endl;

  short cid = api.RP1210_ClientConnect( 0, PCAN_USB, J1939_STRING, 0, 0, 0 );
  if( cid < 128 )
  {
    std::cout << "Connect succesful!" << std::endl;
  }
  else
  {
    std::cout << "Connect error:" << qPrintable( getErrorDescription( cid ) ) << std::endl;
    return 1;
  }

  return 0;
}

Hello,

please check that the net you want to use belongs to the PCAN-USB that is connected, and that the RP1210-Channel configured for that net is "0".

Also you can try to disconnect the Net from the other application and try your application first.

Hello!

Setting channel to "0" in PCAN Nets config helped (initialy it was set to "1")!

Thanks a lot!

Hello,

Now I have problem with reading messages using J1939 protocol.

I called a RP1210_ClientConnect function with nIsAppPacketizingIncomingMsgs parameter set to 0.

When I read a message using RP1210_ReadMessage I receive only an RTS frame with correct source and destination addresses. This means I should answer this frame myself? But what meaning in setting nIsAppPacketizingIncomingMsgs to 0 when connecting? Should the device handle long messages itself?

When I send a large amount of data (1785 bytes) using RP1210_SendMessage this data was sent correctly and the other side successfuly received it.

We working on a answer, but the colleauges who take care of the RP1210 implementations are all on a training - we will come back to answer your request soon as possible.

Hello,

please be sure to have claimed a J1939 address by using the RP1210_SendCommand function. RTS/CTS sessions (peer-to-peer) need a valid protected source (claimed address). Without a claimed address the PCAN-RP1210 will not handshake for large messages reception.

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