emWin driver GUIDRV_7529

Supported hardware

Controllers

This driver works with the Sitronix ST7529 display controller.

Bits per pixel

Supported color depths are 5 bpp (default), 4 bpp and 1bpp.

Interfaces

The driver supports the indirect interface (8 and 16 bit) of the display controller. Parallel, 3-pin SPI or 4-pin SPI access
can be used.

Display data RAM organization

The picture above shows the relation between the display memory and the SEG and COM lines of the LCD.

Additional RAM requirements of the driver

This display driver can be used with or without a display data cache, containing a complete copy of the LCD data RAM.
If a cache is not used, there are no additional RAM requirements. It is optional (but recommended) to use this driver
with a data cache for faster LCD-access. The amount of memory used by the cache may be calculated as follows:

5bpp mode: Size of RAM (in bytes) =  (LCD_XSIZE + 2) / 3 * 3 * LCD_YSIZE
4bpp mode: Size of RAM (in bytes) = ((LCD_XSIZE + 2) / 3 * 3 + 1) / 2 * LCD_YSIZE
1bpp mode: Size of RAM (in bytes) = ((LCD_XSIZE + 2) / 3 * 3 + 7) / 8 * LCD_YSIZE

Hardware configuration

This driver accesses the hardware with the indirect interface. The following table lists the macros which must be
defined for hardware access:

Macro	Explanation
LCD_WRITE_A0	Write a byte to LCD controller with A-line low.
LCD_WRITE_A1	Write a byte to LCD controller with A-line high.
LCD_WRITEM_A1	Write multiple bytes to display controller with A-line high.
LCD_READM_A1	Read multiple bytes from display controller with A-line high. Required only if no display data cache is configured.
LCD_FIRSTPIXEL0	If the display size in X is smaller than the number of segment outputs of the display controller, this macro can be used for defining the first visible pixel of the display. It should be used if the first segment lines of the display controller are not connected to the display.

Additional configuration switches

Macro	Explanation
LCD_CACHE	When set to 0, no display data cache is used, which slows down the speed of the driver. Default is 1 (cache activated).

Special requirements for certain LCD controllers

None.