CFA633-RDI-KU datasheet(56/86 Pages) CRYSTAIFONTZ

56 / 86 page

Crystalfontz America, Inc.

Data Sheet Release Date 2012/02/21

www.crystalfontz.com

CFA633-RDI-KU LCD Module (Hardware v2.0 / Firmware u2v1)

February 2012

Page 56

Please Note: Previous and future firmware versions may return fewer or additional bytes.

31 (0x1F): Send Data to LCD

This command allows data to be placed at any position on the LCD.

type: 0x1F = 3110

data_length = 3 to 18

data[0]: col = x = 0 to 15

data[1]: row = y = 0 to 1

data[2-21]: text to place on the LCD, variable from 1 to 16 characters

The return packet will be:

type: 0x40 | 0x1F = 0x5F = 9510

data_length = 0

Send Data to LCD is one of the items stored by the command 4 (0x04): Store Current State As Boot State (Pg. 37).

32: Reserved for CFA631 Key Legends

33 (0x21): Set Baud Rate

This command will change the CFA633’s baud rate. The CFA633 will send the acknowledge packet for this command

and change its baud rate to the new value. The host should send the baud rate command, wait for a positive

acknowledge from the CFA633 at the old baud rate, and then switch itself to the new baud rate. The baud rate must be

saved by the command 4 (0x04): Store Current State As Boot State (Pg. 37) if you want the CFA633 to power up at the

new baud rate.

The factory default baud rate is 19200.

type: 0x21 = 3310

data_length = 0

data[0]: 0 = 19200 baud

1 = 115200 baud

The return packet will be:

type: 0x40 | 0x21 = 0x61 = 9710

data_length = 0

34 (0x22): Set or Set and Configure GPIO Pins

The CFA633 (hardware versions v1.4 and up, firmware versions 1.9 and up) has five pins for user-definable general

purpose input / output (GPIO). These pins are shared with the DOW and ATX functions. Be careful when you configure

the GPIO if you want to use the ATX or DOW at the same time.

The architecture of the CFA633 allows great flexibility in the configuration of the GPIO pins. They can be set as input or

output. They can output constant high or low signals or a variable duty cycle 100 Hz PWM signal.

In output mode using the PWM (and a suitable current limiting resistor), an LED may be turned on or off and even

dimmed under host software control. With suitable external circuitry, the GPIOs can also be used to drive external logic

or power transistors.

The CFA633 continuously polls the GPIOs as inputs at 32 Hz. The present level can be queried by the host software at

a lower rate. The CFA633 also keeps track of whether there were rising or falling edges since the last host query (subject

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