COM iMX25 WinCE

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FAQ

Q: How long does it take to start WinCE from MicroSD Card?
A: Start time is depending on the image size. With normal image size of 10MByte (nk.gz file) it takes roughly 18 up to 20 seconds to boot WinCE.
Q: How long does it take to start WinCE from NAND flash?
A: Start time is depending on the image size. With normal image size of 10MByte (nk.gz file) it takes roughly 16 up to 18 seconds to boot WinCE.

Registry Settings

LCD Controller

[HKEY_LOCAL_MACHINE\Drivers\Display\LCDC]
  "PanelType"=dword:1    ; LCD Panel identifier 
                         ; Description: Set "PanelType" = 0 to use the bootloader LCD controller settings, which can be programmed to NAND Flash via settings.bin file.
[HKEY_LOCAL_MACHINE\SYSTEM\GDI\ROTATION]
  "Angle"=dword:0        ; no rotation
                         ; "Angle"=dword:5A --> 90 degrees rotated clockwise
                         ; "Angle"=dword:B4 --> 180 degrees rotated clockwise
                         ; "Angle"=dword:10E --> 270 degrees rotated clockwise

Task Bar Look

[HKEY_LOCAL_MACHINE\Explorer]
  “QVGA“=dword:00000001  ; Change Task bar style: 0 --> normal Windows look, 1 --> PDA look

NAND Flash (FlashDisk) base address

[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\NAND_Flash]
  “FlashDiskBaseAddress“=dword:02000000  ; Configures the WinCE NAND FlashDisk Base address

DHHalLib (function library)

The DHHalLib provides hardware related functions for Windows Embedded CE 6 and Windows Embedded Compact 7. All the functionality is available from the user mode.

Version numbers

Read DHHalLib version
unsigned long DHHalLibGetVersion()
Return value: unsigned long --> version number (e.g. 0x01040001 for version 1.4.0.1)
BSP version
unsigned long BSPGetVersion()
Return value: unsigned long --> version number (e.g. 0x01040001 for version 1.4.0.1)
Note: The version number information is stored in the following registry key: [HKEY_LOCAL_MACHINE\Ident] dword:"BSPVersionNumber"
Read image version
unsigned long WinCEImageGetVersion()
Return value: unsigned long --> version number (e.g. 0x01040001 for version 1.4.0.1)

I2C

Read
bool I2CRead( unsigned char cI2CPort, unsigned char cDevId, unsigned char cI2CReg, bool bSendStop, unsigned char *pOutBuffer)
Input values:
unsigned char cI2CPort = DHCOM I2C port number (1.. 2)
unsigned char iDevId = I2C device address (0..127)
unsigned char iI2CReg = I2C device register address (0..255)
bool bSendStop = send or not send stop bit at the end of the transfer (true --> stop bit is generated)
unsigned char *pOutBuffer = Pointer to the read byte
Return value: bool --> true = success; false = failed
Write
bool I2CWrite( unsigned char cI2CPort, unsigned char cDevId, unsigned char cI2CReg, unsigned char cValue, bool bSendStop)
Input values:
unsigned char cI2CPort = DHCOM I2C port number (1.. 2)
unsigned char iDevId = I2C device address (0..127)
unsigned char iI2CReg = I2C device register address (0..255)
unsigned char iValue = Value to be written
bool bSendStop = send or not send stop bit at the end of the transfer (true --> stop bit is generated)
Return value: bool --> true = success; false = failed
Read multiple bytes
bool I2CReadMultipleBytes( unsigned char cI2CPort, unsigned char cDevId, unsigned char cI2CReg, unsigned char cBytes, bool bSendStop, unsigned char *pOutBuffer)
Input values:
unsigned char cI2CPort = DHCOM I2C port number (1.. 2)
unsigned char iDevId = I2C device address (0..127)
unsigned char iI2CReg = I2C device register address (0..255)
unsigned char cBytes = Number of bytes to be read (max. 255)
bool bSendStop = send or not send stop bit at the end of the transfer (true --> stop bit is generated)
unsigned char *pOutBuffer = Pointer to the read buffer
Return value: bool --> true = success; false = failed
Write multiple bytes
bool I2CWriteMultipleBytes( unsigned char cI2CPort, unsigned char cDevId, unsigned char cI2CReg, unsigned char cBytes, bool bSendStop, unsigned char *pInBuffer)
Input values:
unsigned char cI2CPort = DHCOM I2C port number (1.. 2)
unsigned char iDevId = I2C device address (0..127)
unsigned char iI2CReg = I2C device register address (0..255)
unsigned char cBytes = Number of bytes to be written (max. 255)
bool bSendStop = send or not send stop bit at the end of the transfer (true --> stop bit is generated)
unsigned char *pInBuffer = Pointer to the input buffer
Return value: bool --> true = success; false = failed
Bus scan
bool I2CProbe(unsigned char cI2CPort, unsigned char cDevId)
Description:
Scans the bus for the specified device address. Is this achievable, then the function returns "true".
Input values:
unsigned char cI2CPort = DHCOM I2C port number (1.. 2)
unsigned char iDevId = I2C device address (0..127)
Return value: bool --> true = success; false = failed

GPIO

Note: These functions can only access the DHCOM standard GPIOs. The mapping is done with the following enum.
  enum DHCOM_GPIOEnum
  {
    DHCOM_GPIO_A,
    DHCOM_GPIO_B,
    DHCOM_GPIO_C,
    DHCOM_GPIO_D,
    DHCOM_GPIO_E,
    DHCOM_GPIO_F,
    DHCOM_GPIO_G,
    DHCOM_GPIO_H,
    DHCOM_GPIO_I,
    DHCOM_GPIO_J,
    DHCOM_GPIO_K,
    DHCOM_GPIO_L,
    DHCOM_GPIO_M,
    DHCOM_GPIO_N,
    DHCOM_GPIO_O,
    DHCOM_GPIO_P,
    DHCOM_GPIO_Q,
    DHCOM_GPIO_R,
    DHCOM_GPIO_S,
    DHCOM_GPIO_T,
    DHCOM_GPIO_U,
    DHCOM_GPIO_NOT_DEFINED
  };
Direction
bool GPIOSetDirection( DHCOM_GPIOEnum eGpio, bool bInOut, bool bDefaultState)
Input values:
DHCOM_GPIOEnum eGpio = DHCOM GPIO pin name
bool bInOut = GPIO direction (1 = input / 0 = output)
bool bDefaultState = Default state (0 = low / 1 = high)
Return value: bool --> true = success; false = failed
Set state
void GPIOSetPin(DHCOM_GPIOEnum eGpio, bool bState)
Input values:
DHCOM_GPIOEnum eGpio = DHCOM GPIO pin name
bool bState = pin state ( 0 = low / 1 = high)
Read state
bool GPIOGetPin(DHCOM_GPIOEnum eGpio)
Input values:
DHCOM_GPIOEnum eGpio = DHCOM GPIO pin name
Return value: bool --> 0 = low; 1 = high

Memory

Read physical address
int ReadPhysicalAddress(int iPhyAddr, unsigned char cRegSize)
Input values:
int iPhyAddr = Physical address
unsigned char cRegSize = Register size (16 = 16bit; 32 = 32bit)
Return value: int --> current value of the physical address
Write physical address
int WritePhysicalAddress( int iPhyAddr, unsigned char cRegSize, int iValue, bool bReadBack)
Input values:
int iPhyAddr = physical address
unsigned char cRegSize = Register size (16 = 16bit; 32 = 32bit)
int iValue = Value to be written
bool bReadBack = true --> the current value is read back after the write; false --> the current value isn’t read back after the write
Return value: int --> content of the physical address after write, if bReadBack = true. Otherwise the function returns 0.
Map physical memory
PVOID UserMmMapIoSpace(ULONG PhysicalAddress, ULONG NumberOfBytes, BOOLEAN CacheEnable)
Input values:
ULONG PhysicalAddress = physical address
ULONG NumberOfBytes = Number of bytes to map
BOOLEAN CacheEnable = true --> Cached memory map; false --> Uncached memory map
Return value: PVOID --> virtual base address of the mapped memory
Note: From WinCE 6, the function MmMapIoSpace() can not be called from the user mode. THis library function provides a workaround.
UnMap physical memory
void UserMmUnmapIoSpace(PVOID BaseAddress, ULONG NumberOfBytes)
Input values:
PVOID BaseAddress = pointer to virtual base address of the mapped memory
ULONG NumberOfBytes = Number of mapped bytes
Note: From WinCE 6, the function MmUnmapIoSpace() can not be called from the user mode. THis library function provides a workaround.


Backlight

PWM
bool SetBacklightPWM(int iPercent)
Input values:
int iPercent = Backlight brightness in percent
Return value: bool --> true = success; false = failed

Touch screen

Calibrate touch
bool CalibrateTouch()
Return value: bool --> true = success; false = failed
Save calibration data
bool SaveTouchCalibrationData()
Return value: bool --> true = success; false = failed
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