S3C6410 GPIO port access through VC++ Application

Question

Dear all,

            I am new to WINCE/VC++ development environment, I m using samsung S3C6410 development board, I tried to access the GPIO's through VC++ application , i got failed, I tried to access from Driver it is working fine. 

Based on my search  i found , Need to do Virtual mapping for GPIO's to Access those from application. 

 

volatile S3C6410_GPIO_REG * g_pGPIOReg ;

BOOL bRet = TRUE;


 g_pGPIOReg = (S3C6410_GPIO_REG *)DrvLib_MapIoSpace(S3C6410_BASE_REG_PA_GPIO, sizeof(S3C6410_GPIO_REG), FALSE);
 if (g_pGPIOReg == NULL)
 {
  //TSPERR((_T("[TSP:ERR] TSP_VirtualAlloc() : g_pGPIOReg Allocation Fail\r\n")));
  bRet = FALSE;
  goto CleanUp;
 }
CleanUp: if (bRet == FALSE)  {   // TSPERR((_T("[TSP:ERR] TSP_VirtualAlloc() : Failed\r\n")));   TSP_VirtualFree();  }

 

I included Drvlib.h also from S3C6410 SDK..

 

 

#ifndef __S3C6410_DEVICE_DRIVER_LIB_H__
#define __S3C6410_DEVICE_DRIVER_LIB_H__


//extern g_oalAddressTable [index][2];
#if __cplusplus
extern "C"
{
#endif

void *DrvLib_MapIoSpace(UINT32 PhysicalAddress, UINT32 NumberOfBytes, BOOL CacheEnable);
void DrvLib_UnmapIoSpace(void *MappedAddress);

 

But i am getting Error from compilation:

 

 

error LNK2019: unresolved external symbol DrvLib_MapIoSpace referenced in function "public: void __cdecl CbuttonDlg::OnBnClickedButton1(void)" (?OnBnClickedButton1@CbuttonDlg@@QAAXXZ)

1>buttonDlg.obj : error LNK2019: unresolved external symbol DrvLib_UnmapIoSpace referenced in function "void __cdecl TSP_VirtualFree(void)" (?TSP_VirtualFree@@YAXXZ)

1>Idea6410_SDK (ARMV4I)\Debug\button.exe : fatal error LNK1120: 2 unresolved external

 

 

 

How to solve this problem, Please suggest me..

 

Thanks,

sri

 

 

Answer 1

Hi Sri,

I guess that you have to include the libraries which are installed as part of SDK in IDE as dependencies.

If you have already included the libraries in the IDE settings, still you are seeing the error means that the libraries doesn't have the definition for those functions.

Thank You & Regards,

GSR

Answer 2

Hi sudir,

                 Thanks for your reply, In SMDK 6410, Touch screen driver they used this  DrvLib_MapIoSpace , compiled success no problem, this application i m compiling in VS2005 with  that SDK,

 

That fuction definition , i tried all files i m not able to find.. still searching.

 

Thanks,

Sri

 

---

Sri

Answer 3

Hi,

   The best solution is to implement a stream driver to access the GPIO functionality for S3C6410 development board in WinCE BSP.

   Accessing the GPIO port from the application is not a good method.

---

Thanks & best regards, Prasad K R S V

Answer 4

Hi Prasad,

                       Thanks for your reply, Using  DrvLib_MapIoSpace (for Virtual IO Mapping) is not possible from my Application i think, From the Drivers functionalities i can access any ports,

        Means , i have configured some GPIO PORTS in touch screen drivers, After touch Enable buzzer port. i got Success.

I want to Enable some siren, Lights On/OFF,  Though Application Buttons via GPIO  outputs.  

I dont have Clear idea about Stream driver.. Can u give bit idea? or any samples. it would be helpful for me.

 

Thanks,

Sri

 

 

 

---

Sri

Answer 5

Hi,

to read about the Stream Driver Interface concept for Windows CE 6.0 start here.

http://msdn.microsoft.com/en-US/library/ee484885.aspx

Basically a stream interfcae driver is a dll running in kernel mode that exposes a set of functions that can be accessed through the File I/O API, e.g. CreateFile, Read/WriteFile and DeviceIoControl.

Some good examples and very comprehensive articles can be found on Bruce Eitmans' BLOG.

http://geekswithblogs.net/BruceEitman/archive/2008/06/09/windows-ce-a-stream-interface-shell.aspx

We had similar requirements for our project but instead of writing a driver that allows us to manipulate the GPIO pins of our board, we decided to use the NLED Driver API (http://msdn.microsoft.com/en-US/library/ee481282.aspx)

Basic idea is:

- clone the NLED Driver into your BSP.

- add GPIO handling code to the PDD part of the driver

- use the registry to store information on which GPIOs to use

HTH,

Bjoern

Answer 6

Hi,

to read about the Stream Driver Interface concept for Windows CE 6.0 start here.

http://msdn.microsoft.com/en-US/library/ee484885.aspx

Basically a stream interfcae driver is a dll running in kernel mode that exposes a set of functions that can be accessed through the File I/O API, e.g. CreateFile, Read/WriteFile and DeviceIoControl.

Some good examples and very comprehensive articles can be found on Bruce Eitmans' BLOG.

http://geekswithblogs.net/BruceEitman/archive/2008/06/09/windows-ce-a-stream-interface-shell.aspx

We had similar requirements for our project but instead of writing a driver that allows us to manipulate the GPIO pins of our board, we decided to use the NLED Driver API (http://msdn.microsoft.com/en-US/library/ee481282.aspx)

Basic idea is:

- clone the NLED Driver into your BSP.

- add GPIO handling code to the PDD part of the driver

- use the registry to store information on which GPIOs to use

HTH,

Bjoern

Thanks to all of your guidance and support ..

            

 

 

 

---

Sri