Q: Is there example WinCE GPIO code for the PXA270 to toggle a pin?

A:
Yes. See the example below for the pin on J38, Pin 37.
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#include <windows.h>
#include <ceddk.h>


/*
* This is a test to toggle a GPIO signal in a Windows CE application
* Platforms supported: PXA270 Card Engine
* GPIO: PXA270->GPIO110 (MFP6)
* Zoom SDK Pin: J38, pin 37
* Notes:
* - No error checking
* - No use of structures (e.g. GPIO registers)
*
* Library needs:
* - ceddk.lib
* - coredll.lib
*/


int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow)
{
PHYSICAL_ADDRESS phy_addr;
volatile unsigned long *pGAFR3L_reg;
volatile unsigned long *pGPDR3_reg;
volatile unsigned long *pGPCR3_reg;
volatile unsigned long *pGPSR3_reg;
volatile unsigned long *pGPLR3_reg;

/* Place the physical address of the register in the low part. */
phy_addr.LowPart = 0x40E0006C;
phy_addr.HighPart = 0;
/* Call the CEDDK MmMapIoSpace function to retrieve a pointer to a virtual address */
pGAFR3L_reg = MmMapIoSpace(phy_addr, sizeof(*pGAFR3L_reg), FALSE);

/* Place the physical address of the register in the low part. */
phy_addr.LowPart = 0x40E0010C;
phy_addr.HighPart = 0;
/* Call the CEDDK MmMapIoSpace function to retrieve a pointer to a virtual address */
pGPDR3_reg = MmMapIoSpace(phy_addr, sizeof(*pGPDR3_reg), FALSE);

/* Place the physical address of the register in the low part. */
phy_addr.LowPart = 0x40E00124;
phy_addr.HighPart = 0;
/* Call the CEDDK MmMapIoSpace function to retrieve a pointer to a virtual address */
pGPCR3_reg = MmMapIoSpace(phy_addr, sizeof(*pGPCR3_reg), FALSE);

/* Place the physical address of the register in the low part. */
phy_addr.LowPart = 0x40E00118;
phy_addr.HighPart = 0;
/* Call the CEDDK MmMapIoSpace function to retrieve a pointer to a virtual address */
pGPSR3_reg = MmMapIoSpace(phy_addr, sizeof(*pGPSR3_reg), FALSE);

/* Place the physical address of the register in the low part. */
phy_addr.LowPart = 0x40E00100;
phy_addr.HighPart = 0;
/* Call the CEDDK MmMapIoSpace function to retrieve a pointer to a virtual address */
pGPLR3_reg = MmMapIoSpace(phy_addr, sizeof(*pGPLR3_reg), FALSE);

/* Put GPIO110 as GPIO */
*pGAFR3L_reg &= 0xCFFFFFFF;
RETAILMSG(1,(TEXT("GPIO Function: %08x\r\n"),(*pGAFR3L_reg & 0x30000000))); //- only show bits 28,29

/* Put GPIO110 as Output */
*pGPDR3_reg |= 0x00004000;
RETAILMSG(1,(TEXT("GPIO Direction: %08x\r\n"),(*pGPDR3_reg & 0x00004000))); //- only show bit 14

/* Set GPIO110 Low */
*pGPCR3_reg |= 0x00004000;
RETAILMSG(1,(TEXT("GPIO status: %08x\r\n"),(*pGPLR3_reg & 0x00004000))); //- only show bit 14

/* Set GPIO110 High */
*pGPSR3_reg |= 0x00004000;
RETAILMSG(1,(TEXT("GPIO status: %08x\r\n"),(*pGPLR3_reg & 0x00004000))); //- only show bit 14

/* Cleanup memory */
MmUnmapIoSpace((void*)pGAFR3L_reg, sizeof(*pGAFR3L_reg));
MmUnmapIoSpace((void*)pGPDR3_reg, sizeof(*pGPDR3_reg));
MmUnmapIoSpace((void*)pGPCR3_reg, sizeof(*pGPCR3_reg));
MmUnmapIoSpace((void*)pGPSR3_reg, sizeof(*pGPSR3_reg));
MmUnmapIoSpace((void*)pGPLR3_reg, sizeof(*pGPLR3_reg));

return 0;

} /* end WinMain() */

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Product Included:
PXA270