/* auto generated in TouchGFXGeneratedHAL.c */
extern "C" void touchgfxSignalVSync(void)
{
/* VSync has occurred, increment TouchGFX engine vsync counter */
touchgfx::HAL::getInstance()->vSync();
/* VSync has occurred, signal TouchGFX engine */
touchgfx::OSWrappers::signalVSync();
}
/* written in TouchGFXHAL.c */
// The TouchGFX framework calls this function to check if a transmission is in progress
extern "C" int touchgfxDisplayDriverTransmitActive()
{
return isTransmittingBlock ? 1 : 0;
}
// The TouchGFX framework calls this function to check if the transfer of a block should be started
extern "C" int touchgfxDisplayDriverShouldTransferBlock(uint16_t bottom)
{
// Only allow block transfer if the display has drawn past the bottom of the requested block
// (plus a margin of two lines)
// A timer is used to estimate how many lines have been drawn by setting the prescaler
// so the tick rate matches the line draw rate
uint16_t lastLineDrawn = LL_TIM_GetCounter(LINE_TIMER);
int retVal = bottom + 2 < lastLineDrawn || tearingEffectCount > 0;
// return retVal;
return 10; // hard coded to retrun the number of lines
}
extern "C" void touchgfxDisplayDriverTransmitBlock(const uint8_t* pixels, uint16_t x, uint16_t y, uint16_t w, uint16_t h)
{
uint8_t lo = 0, hi = 0;
uint32_t nPixels = w * h;
isTransmittingBlock = true;
SSD1963_SetDisplayWindow(x, y, x+w-1, y+h-1);
// LCD_IO_SendDataDMA((uint8_t*)pixels, w * h * 2); // DMA clears isTransmittingBlock at end of xfer
// Manual Xfer -- down and dirty, no DMA
//
while (nPixels)
{
lo = *pixels++;
hi = *pixels++;
FMC_BANK1_WriteData(((uint16_t)hi << 8) | lo);
nPixels--;
}
isTransmittingData = false; // not necessary with this implementation since DISP_TransmitData is blocking
isTransmittingBlock = false;
osSemaphoreRelease(xDisplayTransmitSemaphore); // release semaphore to mimic DMA
}
Always draw two partial buffers. Seems to be initiated from taskEntry()
