text: /**
   * Marlin 3D Printer Firmware
   * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
   *
   * Based on Sprinter and grbl.
   * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
   *
   * This program is free software: you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation, either version 3 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program.  If not, see <https://www.gnu.org/licenses/>.
   *
   */
  #pragma once
  
  #ifdef STM32F1xx
    #include "stm32f1xx_hal.h"
  #elif defined(STM32F4xx)
    #include "stm32f4xx_hal.h"
  #else
    #error SPI TFT is currently only supported on STM32F1 and STM32F4 hardware.
  #endif
  
  #ifndef LCD_READ_ID
    #define LCD_READ_ID 0x04   // Read display identification information (0xD3 on ILI9341)
  #endif
  #ifndef LCD_READ_ID4
    #define LCD_READ_ID4 0xD3   // Read display identification information (0xD3 on ILI9341)
  #endif
  
  #define DATASIZE_8BIT    SPI_DATASIZE_8BIT
  #define DATASIZE_16BIT   SPI_DATASIZE_16BIT
  #define TFT_IO_DRIVER TFT_SPI
  
  class TFT_SPI {
  private:
    static SPI_HandleTypeDef SPIx;
    static DMA_HandleTypeDef DMAtx;
  
    static uint32_t ReadID(uint16_t Reg);
    static void Transmit(uint16_t Data);
    static void TransmitDMA(uint32_t MemoryIncrease, uint16_t *Data, uint16_t Count);
  
  public:
    static void Init();
    static uint32_t GetID();
    static bool isBusy();
    static void Abort();
  
    static void DataTransferBegin(uint16_t DataWidth = DATASIZE_16BIT);
    static void DataTransferEnd() { WRITE(TFT_CS_PIN, HIGH); };
    static void DataTransferAbort();
  
    static void WriteData(uint16_t Data) { Transmit(Data); }
    static void WriteReg(uint16_t Reg) { WRITE(TFT_A0_PIN, LOW); Transmit(Reg); WRITE(TFT_A0_PIN, HIGH); }
  
    static void WriteSequence(uint16_t *Data, uint16_t Count) { TransmitDMA(DMA_MINC_ENABLE, Data, Count); }
    static void WriteMultiple(uint16_t Color, uint16_t Count) { static uint16_t Data; Data = Color; TransmitDMA(DMA_MINC_DISABLE, &Data, Count); }
    static void WriteMultiple(uint16_t Color, uint32_t Count) {
      static uint16_t Data; Data = Color;
      while (Count > 0) {
        TransmitDMA(DMA_MINC_DISABLE, &Data, Count > 0xFFFF ? 0xFFFF : Count);
        Count = Count > 0xFFFF ? Count - 0xFFFF : 0;
      }
    }
  };
  