FT800 graphics controller and STM32 microcontroller. Has anyone worked with such a combination of iron?

Question

Iron

The essence of the question is to display the Cyrillic alphabet on the display using the FT800 graphics controller. The library I'm using does not have a built-in function to load fonts. An attempt at self-implementation by reverse-engineering the code on arduino was not successful. If someone was engaged in similar iron I ask to help with the decision of a question. Thank you in advance.
The source code of my implementation of loading fonts into the RAM of the graphics controller.

void cmd_inflateFont(const uint8_t* font, uint32_t ptr, int length) {	
  
  //uint16_t count;
  uint16_t sizetransfered;
  uint16_t getfreespace;
  uint32_t length_ =0;
  uint32_t i;
  uint32_t length_1 =0, SizeTransfered = 0;
  unsigned char cTempAddr[3];
  
  ft800memWrite32(RAM_CMD + cli, CMD_INFLATE);
  cli += 4;
  ft800memWrite32(RAM_CMD + cli, ptr);
  cli += 4;

  do {
  length_ = length;
  
  getfree(0);
  
  if (length_ > freespace){
    length_ = freespace;
  }

  do{
    getfree(0);
    getfreespace = freespace;
  }	while(getfreespace < length_);
  

  waitcmdfifo_empty();

  FT800_CS_OFF;	// Set chip select low

  SSP_SendData ((uint8_t)((RAM_CMD)>> 16) | MEM_WRITE);
  SSP_SendData ((uint8_t)((RAM_CMD) >> 8));
  SSP_SendData ((uint8_t)(RAM_CMD));
  cli++;
  LED4_SET;
  
  while (length_--) {
    
    SSP_SendData (ft_pgm_read_byte_near(font));						// Send data byte
    font++;
    cli++;
    sizetransfered++;
  }
  
  FT800_CS_ON;		// Set chip select high
  length_ = sizetransfered;
  updatecmdfifo(cli);
  waitcmdfifo_empty();
  
  length -= length_;
  
}	while(length > 0);
  
  updatecmdfifo(cli);
}

Answer 1

Pretty specific question. I think you should not be tied specifically to the STM32. You just need to generally make a request for a C / C ++ library untied from iron.