CFAG12864Ux and CFAG12864Tx family of displays

Example code for the Crystalfontz CFAG12864T and CFAG12864U family of displays for Seeeduino (Arduino clone) and RaspberryPi. These displays come in reflective and transflective models, are extremely low power, and have slim designs. They also come with optional carrier boards and development kits for quick product evaluation.

Full part numbers and links to the products can be found below.

Displays without carrier boards can be found here:

Part Number	Description
CFAG12864T3-TFH	1" transflective, backlit
CFAG12864T3-NFH	1" reflective, no backlight
CFAG12864T4-NFI	1" transmissive, no backlight
CFAG12864U3-TFH	2.2" transflective, backlit
CFAG12864U3-NFH	2.2" reflective, no backlight
CFAG12864U4-NFI	2.2" transmissive, no backlight

Kits for these products can be found here:

Part Number	Description
CFAG12864T3-NFH-E1-1	Low Power Transflective Graphic LCD Module
CFAG12864T3-NFH-E1-2	Low Power Transflective LCD Dev Kit
CFAG12864T3-TFH-E1-1	128x64 Backlit Transflective LCD with Breakout Board
CFAG12864T3-TFH-E1-2	Small Backlit Monochrome LCD Dev Kit
CFAG12864U3-NFH-E1-1	Low Power Transflective LCD Display Module
CFAG12864U3-NFH-E1-2	Low Power Monochrome LCD Dev Kit
CFAG12864U3-TFH-E1-1	128x64 Monochrome Transflective Backlit LCD Module
CFAG12864U3-TFH-E1-2	128x64 Transflective Backlit LCD Development Kit

Pre-processor directives

There are a number of pre-processor directives in the code that allow you to change the display the code is written for. They can also change which tests are run.

Edit LCD_low.h to reflect the appropriate base display (either CFAG12864T3, CFAG12864T4, CFAG12864U3 or CFAG12864U4) for the correct initialization.

Connection Details

To CFA10110 Adapter Board (See kits above)

SPI Configuration (Arduino)

Pin Definition	10110 Pin	Seeeduino Pin	Connection Description
GND	1	GND	Ground
3V3	2	3V3	Voltage in
RES	3	D9	Reset pin
DNC	4	DNC	Do not connect
DC (RS)	5	D8	Data or Command Register Select
CS	6	D10	Chip Select
RD/E	7	DNC	Read (8080) or Enable (6800)
WR/RW	8	DNC	Write (8080) or Read/Write (6800)
D0	9	DNC	Data pin 0
D1	10	DNC	Data pin 1
D2	11	DNC	Data pin 2
D3	12	DNC	Data pin 3
D4	13	DNC	Data pin 4
D5	14	DNC	Data pin 5
D6/CLK	15	D13	Data pin 6 or Clock pin for SPI
D7/MOSI	16	D11	Data pin 7 or MOSI pin for SPI

SPI Configuration (Raspberry Pi)

Pin Definition	10110 Pin	Rasperry Pi Pin	Connection Description
GND	1	GND	Ground
3V3	2	3V3	Voltage in
RES	3	7 (GPIO4)	Reset pin
DNC	4	DNC	Do not connect
DC (RS)	5	11 (GPIO17)	Data or Command Register Select
CS	6	24 (SPI CE0)	Chip Select
RD/E	7	DNC	Read (8080) or Enable (6800)
WR/RW	8	DNC	Write (8080) or Read/Write (6800)
D0	9	DNC	Data pin 0
D1	10	DNC	Data pin 1
D2	11	DNC	Data pin 2
D3	12	DNC	Data pin 3
D4	13	DNC	Data pin 4
D5	14	DNC	Data pin 5
D6/CLK	15	19 (SPI MOSI)	Clock pin for SPI
D7/MOSI	16	23 (SPI SCLK)	MOSI pin for SPI

Parallel Configuration

This code currently only demonstrates using the SPI interface.

To the display ZIF tail

SPI Configuration

CFAG12864[T/U] Pin	Seeeduino Pin	Connection Description
1 3V3	3V3	Voltage in
2 GND	GND	Ground
3 CS	D10	Chip Select
4 CS	D10	Chip Select
5 RES	D9	Reset pin
6 DC (RS)	D8	Data or Command Register Select
7 WR/RW	DNC	Write (8080) or Read/Write (6800)
8 RD/E	DNC	Read (8080) or Enable (6800)
9 D0	DNC	Data pin 0
10 D1	DNC	Data pin 1
11 D2	DNC	Data pin 2
12 D3	DNC	Data pin 3
13 D4	DNC	Data pin 4
14 D5	DNC	Data pin 5
15 D6/CLK	D13	Data pin 6 or Clock pin for SPI
16 D7/MOSI	D11	Data pin 7 or MOSI pin for SPI
17 C86	3V3	Selects between 8080 and 6800 when in parallel mode
18 P/S	GND	Selects between parallel and SPI mode

Parallel Configuration

This code currently only demonstrates using the SPI interface.

Build instructions for Raspberry Pi

• Install and built WiringPi from source, following it's documentation

• After cloning this repo, build the executable by running this command:

  g++ *.cpp -l wiringPi -o cfag12864u4

Contributors

2017-06-15 Brent A. Crosby
2019-05-01 Trevin Jorgenson
2022-06-20 Kelsey Zaches
2023-12-08 Khayam Sariffodeen
2025-04-01 Max Roberg