Not working on SAM3x8E (Arduino Due) -- changes to get it working

[martinzw]

ILI9225.c

I tried to get my (china) ILI9225 working with ASF and this lib on "Arduino Due" with it's SAM3x8E controller and it's hardware SPI0.
After days of research I found, why it does not work:

1. SPI_MODE_3 instead of 1 has to be chosen (CLK-Signal idle high; capture on rising CLK)
2. 8 bits per Transfer has to be selected (do not switch it back to "default 16Bit" as noted in ili9225_write_cmd-function!!)
3. write_ram and write_ram_buffer functions have to call "spi_write" twice, one time for High-Byte, one time for Low-Byte of the uint16_t-Data:
   spi_write(BOARD_ILI9225_SPI, us_data>>8, BOARD_ILI9225_SPI_NPCS, 0); //High-Byte
   spi_write(BOARD_ILI9225_SPI, us_data&0x00FF, BOARD_ILI9225_SPI_NPCS, 0); //Low-Byte