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[Pad] Watchdog stuff

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wheremyfoodat 2022-08-23 01:01:54 +03:00
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docs/controllersandmemorycards.md
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@ -1357,20 +1357,6 @@ Entering configuration mode enables the DualShock rumble method and disables the
xx=00h Stay in Normal mode
xx=01h Enter Configuration mode
```
Caution: Additionally to activating configuration commands, entering config
mode does also activate a Watchdog Timer which does reset the controller if
there's been no communication for about 1 second or so. The watchdog timer
remains active even when returning to normal mode via Exit Config command. The
reset does disable and lock rumble motors, and switches the controller to
Digital Mode (with LED=off, and analog inputs disabled). To prevent this, be
sure to keep issuing joypad reads even when not needing user input (eg. while
loading data from CDROM).<br/>
Caution 2: A similar reset occurs when the user pushes the Analog button; this
is causing rumble motors to be stopped and locked, and of course, the
analog/digital state gets changed.<br/>
Caution 3: If config commands were used, and the user does then push the analog
button, then the 5Ah-byte gets replaced by 00h (ie. responses change from "HiZ
id 5Ah ..." to "HiZ id 00h ...").<br/>
#### Config Mode - Command 42h "B" - Read Buttons AND analog inputs
```
@ -1481,12 +1467,30 @@ unknown. The command does not seem to be used by any games.<br/>
These commands do return a bunch of 00h bytes. Purpose unknown. These commands
do not seem to be used by any games.<br/>
#### Watchdog Timer
Caution: Additionally to activating configuration commands, entering config
mode does also activate a Watchdog Timer which does reset the controller if
there's been no communication for about 1 second or so. The watchdog timer
remains active even when returning to normal mode via Exit Config command. The
reset does disable and lock rumble motors, and switches the controller to
Digital Mode (with LED=off, and analog inputs disabled). To prevent this, be
sure to keep issuing joypad reads even when not needing user input (eg. while
loading data from CDROM).<br/>
Caution 2: A similar reset occurs when the user pushes the Analog button; this
is causing rumble motors to be stopped and locked, and of course, the
analog/digital state gets changed.<br/>
Caution 3: If config commands were used, and the user does then push the analog
button, then the 5Ah-byte gets replaced by 00h (ie. responses change from "HiZ
id 5Ah ..." to "HiZ id 00h ...").<br/>
Caution 4: Most emulators do not emulate this watchdog functionality
so any homebrew with analog pad support should ideally also be tested on hardware
to make sure it doesn't accidentally trigger the watchdog<br/>
#### Note
Rumble is a potentially annoying feature, so games that do support rumble
should also include an option to disable it.<br/>
## Controllers - Dance Mats
PSX Dance Mats are essentially normal joypads with uncommonly arranged buttons,
the huge mats are meant to be put on the floor, so the user could step on them.<br/>