This driver supports the Fujitsu Graphic display controllers. It has been tested with "Jasmine", but it should also work with "Lavender", since all relevant registers are compatible.

Supported hardware

Controllers

Bits per pixel

Supported color depths are 1, 2, 4, 8 and 16 bpp.

Interfaces

The driver has been tested with a 32 bit interface to the CPU. If a 16 bit interface is used, the 32-bit accesses can be replaced by 2 16-bit accesses.

Display data RAM organization

The display controller uses DRAM in an optimized, non-linear way (described in the Fujitsu documentation). Direct memory access is not used by the driver.

RAM requirements of the driver

About 16 bytes for some static variables.

Additional driver functions

None.

Hardware configuration

This driver requires a full bus interface for hardware access. The following table lists the macros which must be defined for hardware access:

The driver contains a default for hardware access macros, which configures 32 bit access on the Fujistu demonstration platform (Using an MB91361 or MB91362 and a Jasmine chip at address 0x30000000); if the target hardware is compatible with these settings, then LCD_READ_REG(), LCD_WRITE_REG() do not need to be defined.

Additional configuration switches

Color format (R/B swap)

It seems that on some target systems, Red and blue are swapped. This can be changed via software if the Config switch LCD_SWAP_RB is toggled in the configuration file.

Hardware initialisation

The display controller requires a complicated initialisation. Example code is available from Fujistu in the GDC module. This code is not part of the driver, since it depends on the actual chip used, on the clock settings, the display and a lot of other things.
We recommend using the original Fujitsu code, since the documentation of the chips is not sufficient to write this code. Before calling GUI_Init(), the GDC should be initialized using this code (typically called as GDC_Init(0xff)).

Example:
LCDConf.h for VGA display, 8bpp, Jasmin
#define LCD_XSIZE 640 /* X-resolution of LCD, Logical coor. */
#define LCD_YSIZE 480 /* Y-resolution of LCD, Logical coor. */
#define LCD_BITSPERPIXEL 8
#define LCD_CONTROLLER 8720 /* Jasmine */

Additional configuration switches

The following table shows optional configuration macros available for this driver:

Special requirements

None.