CFA633-RDI-KS datasheet(57/88 Pages) CRYSTAIFONTZ

57 / 88 page

Crystalfontz America, Inc.

Data Sheet Release Date 2012/02/21

www.crystalfontz.com

CFA633-RDI-KS LCD Module (Hardware v2.0 / Firmware s2v1)

February 2012

Page 57

29 (0x1D): Enable/Disable and Reset the Watchdog

Some high-availability systems use hardware watchdog timers to ensure that a software or hardware failure does not

result in an extended system outage. Once the host system has booted, a system monitor program is started. The

system monitor program would enable the watchdog timer on the CFA633. If the system monitor program fails to reset

the CFA633’s watchdog timer, the CFA633 will reset the host system.

type: 0x1D = 2910

data_length = 1

data[0] = enable/timeout

If timeout is 0, the watchdog is disabled.

If timeout is 1-255, then this command must be issued again within timeout seconds to

avoid a watchdog reset.

To turn the watchdog off once it has been enabled, simply set timeout to 0.

If the command is not re-issued within timeout seconds, then the CFA633 will reset the

host (see command 28 for details). Since the watchdog is off by default when the CFA633

powers up, the CFA633 will not issue another host reset until the host has once again

enabled the watchdog.

The return packet will be:

type: 0x40 | 0x1D = 0x5D = 9310

data_length = 0

30: Read Reporting & Status

This command can be used to verify the current items configured to report to the host, as well as some other

miscellaneous status information. Please note that the information returned by other modules is not identical to this.

type = 0x1E = 3010

data_length = 0

The return packet will be:

type = 0x40 | 0x1E = 0x5E = 9410

data_length = 15

data[0] = fan 1-4 reporting status (as set by command 16)

data[1] = temperatures 1-8 reporting status (as set by command 19)

data[2] = temperatures 9-15 reporting status (as set by command 19)

data[3] = temperatures 16-23 reporting status (as set by command 19)

data[4] = temperatures 24-32 reporting status (as set by command 19)

data[5] = key presses (as set by command 23)

data[6] = key releases (as set by command 23)

data[7] = ATX Power Switch Functionality (as set by command 28),

data[8] = current watchdog counter (as set by command 29)

data[9] = fan RPM glitch delay[0] (as set by command 26)

data[10] = fan RPM glitch delay[1] (as set by command 26)

data[11] = fan RPM glitch delay[2] (as set by command 26)

data[12] = fan RPM glitch delay[3] (as set by command 26)

data[13] = contrast setting (as set by command 13)

data[14] = backlight setting (as set by command 14)

NOTE

The GPIO pins used for ATX control must not be configured as user GPIO. They must be configured to

their default drive mode in order for the ATX functions to work correctly. These settings are factory default,

but may be changed by the user. Please see the note under command 28 (0x1C): Set ATX Power Switch

Functionality (Pg. 54) or command 34 (0x22): Set or Set and Configure GPIO Pins (Pg. 58).

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