CFA633-RDI-KU datasheet(49/86 Pages) CRYSTAIFONTZ

49 / 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 49

#define KP_UP

0x01

#define KP_ENTER

0x02

#define KP_CANCEL 0x04

#define KP_LEFT

0x08

#define KP_RIGHT

0x10

#define KP_DOWN

0x20

type: 0x17 = 2310

data_length = 2

data[0]: press mask

data[1]: release mask

The return packet will be:

type: 0x40 | 0x17 = 0x57 = 8710

data_length = 0

Configure Key Reporting is one of the items stored by the command 4 (0x04): Store Current State As Boot

State (Pg. 37).

24 (0x18): Read Keypad, Polled Mode

In some situations, it may be convenient for the host to poll the CFA633 for key activity. This command allows the host

to detect which keys are currently pressed, which keys have been pressed since the last poll, and which keys have been

released since the last poll.

This command is independent of the key reporting masks set by command 23 (0x17): Configure Key Reporting (Pg. 48).

All keys are always visible to this command. Typically both masks of command 23 would be set to "0" if the host is reading

the keypad in polled mode.

#define KP_UP

0x01

#define KP_ENTER

0x02

#define KP_CANCEL 0x04

#define KP_LEFT

0x08

#define KP_RIGHT

0x10

#define KP_DOWN

0x20

type: 0x18 = 2410

data_length = 0

The return packet will be:

type: 0x40 | 0x18 = 0x58 = 8810

data_length = 3

data[0] = bit mask showing the keys currently pressed

data[1] = bit mask showing the keys that have been pressed since

the last poll

data[2] = bit mask showing the keys that have been released since

the last poll

25 (0x19): Set Fan Power Fail-Safe

The CFA633 can be used as part of an active cooling system. For instance, the fans in a system can be slowed down to

reduce noise when a system is idle or when the ambient temperature is low, and sped up when the system is under

heavy load or the ambient temperature is high.

Since there are a very large number of ways to control the speed of the fans (thresholds, thermostat, proportional, PID,

multiple temperature sensors contributing to the speed of several fans . . .) there was no way to foresee the particular

requirements of your system and include an algorithm in the CFA633’s firmware that would be an optimal fit for your

application.

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