#include "config.h"
#include "display.h"
#include "spi.h"

#include <memory.h>

void ClearScreen()
{
  for(int y = 0; y < DISPLAY_HEIGHT; ++y)
  {
#ifdef DISPLAY_SPI_BUS_IS_16BITS_WIDE
    SPI_TRANSFER(DISPLAY_SET_CURSOR_X, 0, 0, 0, 0, 0, (DISPLAY_WIDTH-1) >> 8, 0, (DISPLAY_WIDTH-1) & 0xFF);
    SPI_TRANSFER(DISPLAY_SET_CURSOR_Y, 0, (uint8_t)(y >> 8), 0, (uint8_t)(y & 0xFF), 0, (DISPLAY_HEIGHT-1) >> 8, 0, (DISPLAY_HEIGHT-1) & 0xFF);
#elif defined(DISPLAY_SET_CURSOR_IS_8_BIT)
    SPI_TRANSFER(DISPLAY_SET_CURSOR_X, 0, DISPLAY_WIDTH-1);
    SPI_TRANSFER(DISPLAY_SET_CURSOR_Y, (uint8_t)y, DISPLAY_HEIGHT-1);
#else
    SPI_TRANSFER(DISPLAY_SET_CURSOR_X, 0, 0, (DISPLAY_WIDTH-1) >> 8, (DISPLAY_WIDTH-1) & 0xFF);
    SPI_TRANSFER(DISPLAY_SET_CURSOR_Y, (uint8_t)(y >> 8), (uint8_t)(y & 0xFF), (DISPLAY_HEIGHT-1) >> 8, (DISPLAY_HEIGHT-1) & 0xFF);
#endif
    SPITask *clearLine = AllocTask(DISPLAY_WIDTH*SPI_BYTESPERPIXEL);
    clearLine->cmd = DISPLAY_WRITE_PIXELS;
    memset(clearLine->data, 0, clearLine->size);
    CommitTask(clearLine);
    RunSPITask(clearLine);
    DoneTask(clearLine);
  }
#ifdef DISPLAY_SPI_BUS_IS_16BITS_WIDE
  SPI_TRANSFER(DISPLAY_SET_CURSOR_X, 0, 0, 0, 0, 0, (DISPLAY_WIDTH-1) >> 8, 0, (DISPLAY_WIDTH-1) & 0xFF);
  SPI_TRANSFER(DISPLAY_SET_CURSOR_Y, 0, 0, 0, 0, 0, (DISPLAY_HEIGHT-1) >> 8, 0, (DISPLAY_HEIGHT-1) & 0xFF);
#elif defined(DISPLAY_SET_CURSOR_IS_8_BIT)
  SPI_TRANSFER(DISPLAY_SET_CURSOR_X, 0, DISPLAY_WIDTH-1);
  SPI_TRANSFER(DISPLAY_SET_CURSOR_Y, 0, DISPLAY_HEIGHT-1);
#else
  SPI_TRANSFER(DISPLAY_SET_CURSOR_X, 0, 0, (DISPLAY_WIDTH-1) >> 8, (DISPLAY_WIDTH-1) & 0xFF);
  SPI_TRANSFER(DISPLAY_SET_CURSOR_Y, 0, 0, (DISPLAY_HEIGHT-1) >> 8, (DISPLAY_HEIGHT-1) & 0xFF);
#endif
}