/**************************************************************************//**
* @brief Draw single character into frame buffer
* @param[in] x Horizontal start position into frame buffer in pixels
* @param[in] y Vertical start position into frame buffer in pixels
* @param[in] str String to draw
*****************************************************************************/
void TFT_DrawString(int x, int y, char *str)
{
/* Draw string, no boundary checks are performed */
while (*str)
{
TFT_DrawFont(x, y, *str++);
x += 16;
}
}
/**************************************************************************//**
* @brief EBI interrupt routine, configures new frame buffer offset
*****************************************************************************/
void EBI_IRQHandler(void)
{
uint32_t flags;
uint32_t lineNumber;
uint32_t prevMaskBlend;
/* Get source for interrupt */
flags = EBI_IntGet();
/* Clear interrupt */
EBI_IntClear(flags);
/* Process vertical sync interrupt */
if (flags & EBI_IF_VFPORCH)
{
/* Keep tracke of number of frames drawn */
frameCtr++;
/* Increase this increment to 2/4/8 to increase scroll speed */
hzOffset += 1;
/* Wrap around when a full screen has been displayed */
if (hzOffset == (D_WIDTH + font16x28.c_width))
{
hzOffset = 0;
}
/* We only redraw when we need to */
if (hzOffset != hPos)
{
hPos = hzOffset;
/* We only redraw when we need a new character */
if ((hPos % 16) == 0)
{
/* Update frame buffer - we do this in the interrupt routine to */
/* ensure a smooth scroller no matter what else is being done. */
/* However, drawing these fonts with low optimization will take */
/* more than one scan line, so this _can_ result in tearing at the */
/* top of the screen for this example. */
prevMaskBlend = EBI->TFTCTRL & _EBI_TFTCTRL_MASKBLEND_MASK;
EBI_TFTMaskBlendMode(ebiTFTMBDisabled);
TFT_DrawFont(D_WIDTH + hPos, D_HEIGHT - font16x28.height, *scrollptr);
if (hPos > 0)
{
TFT_DrawFont(hPos - font16x28.c_width, D_HEIGHT - font16x28.height, *scrollptr);
}
EBI->TFTCTRL |= prevMaskBlend;
/* Update pointer into text, reset if at last character */
scrollptr++;
if (*scrollptr == '\0')
{
scrollptr = scrolltext;
}
}
}
}
/* Process horizontal sync interrupt */
if (flags & EBI_IF_HSYNC)
{
lineNumber = EBI_TFTVCount();
/* Adjust for porch size */
if (lineNumber >= 3) lineNumber -= 3;
if (lineNumber < (D_HEIGHT - font16x28.c_height))
{
EBI_TFTFrameBaseSet(lineNumber * V_WIDTH * 2);
}
else
{
EBI_TFTFrameBaseSet(lineNumber * V_WIDTH * 2 + hzOffset * 2);
}
}
}
