here is a code example for you (file TouchgfxGeneratedHal.cpp):
/*
* ******************************************************
* Required by Partial Frame Buffer Strategy
* ******************************************************
*/
static volatile bool blockIsTransferred = false;
namespace touchgfx
{
/**
* This function is called by FrameBufferAllocator if no block is
* available.
*/
void FrameBufferAllocatorWaitOnTransfer()
{
/* NOTE: This function should not be modified, when the fuction is needed,
* FrameBufferAllocatorWaitOnTransfer should be implemented in the user file
*/
while(blockIsTransferred){
osDelay(1);
}
}
// A user must call touchgfx::startNewTransfer(); once transmitFrameBufferBlock() has successfully sent a block.
void startNewTransfer()
{
FrameBufferAllocator* fba = HAL::getInstance()->getFrameBufferAllocator();
// Free the previous transmitted block, marking it ready for rendering
fba->freeBlockAfterTransfer();
if (fba->hasBlockReadyForTransfer())
{
touchgfx::Rect r;
// Get pointer to block buffer and coordinates of the rect
const uint8_t* pixels = fba->getBlockForTransfer(r);
blockIsTransferred = true;
// Start transmission of the block
touchgfxDisplayDriverTransmitBlock((uint8_t*)pixels, r.x, r.y, r.width, r.height);
}
}
extern "C"
void DisplayDriver_TransferCompleteCallback()
{
// After completed transmission start new transfer if blocks are ready.
blockIsTransferred = false;
touchgfx::startNewTransfer();
}
