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- ===================================
- cfag12864b LCD Driver Documentation
- ===================================
- :License: GPLv2
- :Author & Maintainer: Miguel Ojeda <ojeda@kernel.org>
- :Date: 2006-10-27
- .. INDEX
- 1. DRIVER INFORMATION
- 2. DEVICE INFORMATION
- 3. WIRING
- 4. USERSPACE PROGRAMMING
- 1. Driver Information
- ---------------------
- This driver supports a cfag12864b LCD.
- 2. Device Information
- ---------------------
- :Manufacturer: Crystalfontz
- :Device Name: Crystalfontz 12864b LCD Series
- :Device Code: cfag12864b
- :Webpage: http://www.crystalfontz.com
- :Device Webpage: http://www.crystalfontz.com/products/12864b/
- :Type: LCD (Liquid Crystal Display)
- :Width: 128
- :Height: 64
- :Colors: 2 (B/N)
- :Controller: ks0108
- :Controllers: 2
- :Pages: 8 each controller
- :Addresses: 64 each page
- :Data size: 1 byte each address
- :Memory size: 2 * 8 * 64 * 1 = 1024 bytes = 1 Kbyte
- 3. Wiring
- ---------
- The cfag12864b LCD Series don't have official wiring.
- The common wiring is done to the parallel port as shown::
- Parallel Port cfag12864b
- Name Pin# Pin# Name
- Strobe ( 1)------------------------------(17) Enable
- Data 0 ( 2)------------------------------( 4) Data 0
- Data 1 ( 3)------------------------------( 5) Data 1
- Data 2 ( 4)------------------------------( 6) Data 2
- Data 3 ( 5)------------------------------( 7) Data 3
- Data 4 ( 6)------------------------------( 8) Data 4
- Data 5 ( 7)------------------------------( 9) Data 5
- Data 6 ( 8)------------------------------(10) Data 6
- Data 7 ( 9)------------------------------(11) Data 7
- (10) [+5v]---( 1) Vdd
- (11) [GND]---( 2) Ground
- (12) [+5v]---(14) Reset
- (13) [GND]---(15) Read / Write
- Line (14)------------------------------(13) Controller Select 1
- (15)
- Init (16)------------------------------(12) Controller Select 2
- Select (17)------------------------------(16) Data / Instruction
- Ground (18)---[GND] [+5v]---(19) LED +
- Ground (19)---[GND]
- Ground (20)---[GND] E A Values:
- Ground (21)---[GND] [GND]---[P1]---(18) Vee - R = Resistor = 22 ohm
- Ground (22)---[GND] | - P1 = Preset = 10 Kohm
- Ground (23)---[GND] ---- S ------( 3) V0 - P2 = Preset = 1 Kohm
- Ground (24)---[GND] | |
- Ground (25)---[GND] [GND]---[P2]---[R]---(20) LED -
- 4. Userspace Programming
- ------------------------
- The cfag12864bfb describes a framebuffer device (/dev/fbX).
- It has a size of 1024 bytes = 1 Kbyte.
- Each bit represents one pixel. If the bit is high, the pixel will
- turn on. If the pixel is low, the pixel will turn off.
- You can use the framebuffer as a file: fopen, fwrite, fclose...
- Although the LCD won't get updated until the next refresh time arrives.
- Also, you can mmap the framebuffer: open & mmap, munmap & close...
- which is the best option for most uses.
- Check samples/auxdisplay/cfag12864b-example.c
- for a real working userspace complete program with usage examples.
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