int initTFT()
{
int Status;
XTft_Config *TftConfigPtr;
/*
* Get address of the XTft_Config structure for the given device id.
*/
TftConfigPtr = XTft_LookupConfig(TFT_DEVICE_ID);
if (TftConfigPtr == (XTft_Config *)NULL)
{
return XST_FAILURE;
}
/*
* Initialize all the TftInstance members and fills the screen with
* default background color.
*/
Status = XTft_CfgInitialize(&TftInstance, TftConfigPtr,
TftConfigPtr->BaseAddress);
if (Status != XST_SUCCESS)
{
return XST_FAILURE;
}
/*
* Wait till Vsync(Video address latch) status bit is set before writing
* the frame address into the Address Register. This ensures that the
* current frame has been displayed and we can display a new frame of
* data. Checking the Vsync state ensures that there is no data flicker
* when displaying frames in real time though there is some delay due to
* polling.
*/
while (XTft_GetVsyncStatus(&TftInstance) !=
XTFT_IESR_VADDRLATCH_STATUS_MASK);
/*
* Change the Video Memory Base Address from default value to
* a valid Memory Address and clear the screen.
*/
XTft_SetFrameBaseAddr(&TftInstance, TFT_FRAME_ADDR);
XTft_ClearScreen(&TftInstance);
XTft_SetPos(&TftInstance, 0,0);
XTft_SetPosChar(&TftInstance, 0,0);
XTft_SetColor(&TftInstance, 0x00000000, 0x00ffffff);
XTft_FillScreen(&TftInstance, 0, 0,639,479,0x00ffffff); // white
return XST_SUCCESS;
}
/**
*
* This function initializes a TFT Driver Instance.
*
* @param InstancePtr is a pointer to the XTft instance.
* @param ConfigPtr is a pointer to a XTft_Config configuration
* structure.This structure will contain the requested
* configuration for the device. Typically, this is a local
* structure and the content of which will be copied into the
* configuration structure within XTft.
* @param EffectiveAddr is the device base address in the virtual
* memory address space. If the address translation is not used
* then the physical address is passed. Unexpected errors may
* occur if the address mapping is changed after this function
* is invoked.
* This address is taken into consideration only if the
* the TFT controller Register interface is connected to the
* PLB bus.
*
* @return
* - XST_SUCCESS if successful.
* - XST_FAILURE if unsuccessful.
*
* @note None.
*
****************************************************************************/
int XTft_CfgInitialize(XTft *InstancePtr, XTft_Config *ConfigPtr,
u32 EffectiveAddr)
{
/*
* Assert validates the input arguments.
*/
Xil_AssertNonvoid(InstancePtr != NULL);
Xil_AssertNonvoid(ConfigPtr != NULL);
/*
* Setup the DeviceId, Video Memory Address and Base Address
* and Plb Access from the configuration structure.
*/
InstancePtr->TftConfig.DeviceId = ConfigPtr->DeviceId;
InstancePtr->TftConfig.BaseAddress = EffectiveAddr;
InstancePtr->TftConfig.VideoMemBaseAddr =
ConfigPtr->VideoMemBaseAddr;
InstancePtr->TftConfig.PlbAccess = ConfigPtr->PlbAccess;
InstancePtr->TftConfig.DcrBaseAddr = ConfigPtr->DcrBaseAddr;
/*
* Initialize the XTft Instance members to default values.
*/
InstancePtr->ColVal = XTFT_DEF_COLVAL;
InstancePtr->RowVal = XTFT_DEF_ROWVAL;
InstancePtr->FgColor = XTFT_DEF_FGCOLOR;
InstancePtr->BgColor = XTFT_DEF_BGCOLOR;
/*
* Indicate the XTft Instance is now ready to use, initialized
* without error.
*/
InstancePtr->IsReady = XIL_COMPONENT_IS_READY;
/*
* Fills the screen with the default background color.
*/
XTft_FillScreen(InstancePtr, XTFT_DEF_COLVAL, XTFT_DEF_ROWVAL,
(XTFT_DISPLAY_WIDTH - 1), (XTFT_DISPLAY_HEIGHT - 1),
InstancePtr->BgColor);
return XST_SUCCESS;
}
/**
*
* This function re-initializes all the pixels to the default background color.
*
* @param InstancePtr is a pointer to the XTft instance.
*
* @return None.
*
* @note None.
*
****************************************************************************/
void XTft_ClearScreen(XTft *InstancePtr)
{
/*
* Assert validates the input arguments.
*/
Xil_AssertVoid(InstancePtr != NULL);
Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
/*
* Fills the screen with the background color of Instance structure.
*/
XTft_FillScreen(InstancePtr, XTFT_DEF_COLVAL, XTFT_DEF_ROWVAL,
(XTFT_DISPLAY_WIDTH - 1), (XTFT_DISPLAY_HEIGHT - 1),
InstancePtr->BgColor);
/*
* Initialize the column, row positions to (0, 0)origin.
*/
InstancePtr->ColVal = XTFT_DEF_COLVAL;
InstancePtr->RowVal = XTFT_DEF_ROWVAL;
}
/**
*
* This function inserts a new blank line at the bottom of the screen, it
* deletes the first line and moves the remaining lines up by one line.
*
* @param InstancePtr is a pointer to the XTft instance.
*
* @return None.
*
* @note None.
*
****************************************************************************/
void XTft_Scroll(XTft *InstancePtr)
{
u32 PixelVal;
u32 ColIndex;
u32 RowIndex;
/*
* Assert validates the input arguments.
*/
Xil_AssertVoid(InstancePtr != NULL);
Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
/*
* Takes each pixel value from the second line and puts in the first
* line. This process is repeated till the second line
* from bottom.
*/
for (RowIndex = 0;
RowIndex < (XTFT_DISPLAY_HEIGHT - 1) - XTFT_CHAR_HEIGHT;
RowIndex++) {
for (ColIndex = 0; ColIndex < (XTFT_DISPLAY_WIDTH - 1);
ColIndex++) {
XTft_GetPixel(InstancePtr, ColIndex,
RowIndex + XTFT_CHAR_HEIGHT, &PixelVal);
XTft_SetPixel(
InstancePtr, ColIndex, RowIndex, PixelVal);
}
}
/*
* Fills the last line with the background color.
*/
XTft_FillScreen(InstancePtr,
XTFT_DEF_COLVAL,
(XTFT_DISPLAY_HEIGHT - 1)-XTFT_CHAR_HEIGHT,
(XTFT_DISPLAY_WIDTH - 1), (XTFT_DISPLAY_HEIGHT - 1),
InstancePtr->BgColor);
}
XStatus XTft_Scroll(XTft *InstancePtr)
{
Xuint32 col;
Xuint32 x, y;
XASSERT_NONVOID(InstancePtr != XNULL);
XASSERT_NONVOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);
for (y = 0; y < XTFT_DISPLAY_HEIGHT-XTFT_CHAR_HEIGHT; y++)
{
for (x = 0; x < XTFT_DISPLAY_WIDTH; x++)
{
col = XTft_mGetPixel(*(Xuint32 *)InstancePtr->BaseAddress, x, y+XTFT_CHAR_HEIGHT);
XTft_mSetPixel(*(Xuint32 *)InstancePtr->BaseAddress, x, y, col);
}
}
XTft_FillScreen(*(Xuint32 *)InstancePtr->BaseAddress,
0, XTFT_DISPLAY_HEIGHT-XTFT_CHAR_HEIGHT,
XTFT_DISPLAY_WIDTH, XTFT_DISPLAY_HEIGHT-1,
InstancePtr->BgColor);
return XST_SUCCESS;
}
