Guide: Advanced Controller Mappings

spud11

@mediamogul Hi. Thanks. I copied your code and pasted it into my runcommand-onstart in case there was a problem at my end. Tried below and it does not work. It's a bit weird that this does not work.

Mario=""mario.zip"|"mario.zip""

I also tested 3 variations without success:

Mario='"mario.zip"|"mario.zip"'

Mario="'mario.zip'|'mario.zip'"

Mario=''mario.zip''|''mario.zip''

I thought it might have something to do with how advmame parses the rom name, but if it it works with Mario=mario.zip as it does, then that seems fairly unlikely.

mediamogul

@spud11 said in Guide: Advanced Controller Mappings:

I also tested 3 variations without success:

Yeah, I threw together a similar setup to yours and tested test those as well. Perhaps it's something outside that particular case that is somehow interfering.

spud11

@mediamogul Yes, I was wondering that too. I'm not sure how to string together cases eg case $2 in and case $1 in in the one statement or even if it is possible. case $2 in has worked very well for me so far.

To test, I switched to case $1 in using the mame-advmame parameter and xboxdrv starts so that's working, but it makes no difference. Same result as before.

GreenRebel

Hey All, Have been following @spud11 adventure and would like to get advice on my runcommand-onstart to get it working with Amiberry. My wireless xpad360 works in game as normal but i cant get any special mapping to work. The file i'm using is below but I'm wondering if you can see any obvious errors please? This thread has already helped me to remove carriage returns from winscp so thumbs up to all.

#!/bin/sh
## Uncomment one or all of the following if you need to find some information about the emulator or roms
## Name of the emulator
#echo $1 >> /dev/shm/runcommand.log

## Name of the software used for running the emulation
#echo $2 >> /dev/shm/runcommand.log

## Name of the rom
#echo $3 >> /dev/shm/runcommand.log

##Executed command line
#echo $4 >> /dev/shm/runcommand.log


### The FUN begins
#Get ROM name striping full path
rom="${3##*/}"

### Set variables for your joypad and emulator
### Basic Configuraions - Standard controller mappings 
basicPS3="sudo /opt/retropie/supplementary/xboxdrv/bin/xboxdrv >/dev/null \
--evdev /dev/input/by-id/usb-CMicrosoft_Xbox_360_Wireless_Receiver_for_Windows_E0E3B7A0-event-joystick \
--silent \
--detach-kernel-driver \
--force-feedback \
--deadzone-trigger 15% \
--deadzone 4000 \
--trigger-as-button \
--mimic-xpad-wireless \
--evdev-absmap ABS_X=x1,ABS_Y=y1,ABS_RX=x2,ABS_RY=y2,ABS_HAT0X=dpad_x,ABS_HAT0Y=dpad_y \
--evdev-keymap BTN_SOUTH=a,BTN_EAST=b,BTN_NORTH=x,BTN_WEST=y,BTN_TL=lb,BTN_TR=rb,BTN_TL2=lt,BTN_TR2=rt,BTN_THUMBL=tl,BTN_THUMBR=tr,BTN_SELECT=back,BTN_START=start \
--calibration x1=-32767:0:32767,y1=-32767:0:32767,x2=-32767:0:32767,y2=-32767:0:32767"


### Extended Configurations
### Specific emulator configuration or any other parameters you will need only for some emulators

amiga="--axismap -Y1=Y1,-Y2=Y2 \
--buttonmap tl^toggle=tl \
--buttonmap tr^toggle=tr \
--ui-axismap tl+x1=REL_X:10,tl+y1=REL_Y:10 \
--ui-buttonmap tl+a=BTN_LEFT,tl+b=BTN_RIGHT \
--ui-buttonmap rt+a=KEY_ENTER,rt+b=KEY_ESC,rt+x=KEY_SPACE,rt+y=KEY_P,rt+du=KEY_UP,rt+dd=KEY_DOWN,rt+dl=KEY_LEFT,rt+dr=KEY_RIGHT \
--ui-buttonmap back+x=KEY_F12,back+start=KEY_Q \
--ui-buttonmap guide=void \
--ui-axismap x2=void"

fourway="--four-way-restrictor"

invert="--ui-buttonmap du=KEY_DOWN,dd=KEY_UP"

### Kill Command
xboxkill="sudo killall >/dev/null xboxdrv"

### Execute the driver with the configuration you need
# $1 is the name of the emulation, not the name of the software used
# it is intellivision not jzintv
case $1 in

	amiga)
		$xboxkill
		joycommand="$basicPS3 $amiga &"
		eval $joycommand
	;;

esac

My last log said:

>/dev/null: No such file or directory
Parameters: 
Executing: /opt/retropie/emulators/amiberry/amiberry.sh auto "/home/pi/RetroPie/roms/amiga/Fantasy World Dizzy.uae"
Amiberry v2.1.1, by Dimitris (MiDWaN) Panokostas and Olly Aigner
Based on previous work by Chips and TomB (Pandora)
Joystick 0 : Xbox 360 Wireless Receiver
    Buttons: 17 Axis: 4 Hats: 1
starting sound thread..
stopping sound thread..
~
xboxdrv: no process found

GreenRebel

Hey All, I have found out that i needed to add a copyright symbol in front of the word microsoft to get it working! Any tips on improvements welcome though.

--evdev /dev/input/by-id/usb-©Microsoft_Xbox_360_Wireless_Receiver_for_Windows_E0E3B7A0-event-joystick \

spud11

@GreenRebel Hi. I can't say I have any expertise in these things as that is why I spend so much time trying to sort things out with mediamogul!

But I'd suggest removing:

 sudo killall >/dev/null xboxdrv

and replace it with:

sudo killall xboxdrv

Do the same for the basicPS3 code too:

basicPS3="sudo /opt/retropie/supplementary/xboxdrv/bin/xboxdrv \

At this stage, while testing, it's best not to suppress messages from xboxdrv. Also, I think when you are ready to put the code back in, it should be as follows:

sudo killall > /dev/null 2>&1 xboxdrv

And:

basicPS3="sudo /opt/retropie/supplementary/xboxdrv/bin/xboxdrv > /dev/null 2>&1 \

Also, I always give the joystick an easy to identify name eg "Player_1" (I've got 4 controllers):

--device-name "Player_1" \

One of the reasons for doing this is that, if you are configuring your controller so that it mimics a keyboard, then you need the following:

SUBSYSTEM=="input", ATTRS{name}=="Player_1", GROUP="users", MODE="0666", ENV{ID_INPUT_KEYBOARD}="1"

This line goes in a file called 99-xboxdrv in folder /etc/udev/rules.d/

You will see that the Player_1 is the same as the name of my controller.

spud11

@mediamogul Hi. Finally, after tinkering for the past 3 days, I've got the code to work. I haven't completely tested it yet, but Mario Bros (a 2 player simultaneous/co-op game) is mapped correctly so that Player 1 and Player 2 are using separate joysticks and Black Tiger (a 2 player alternate game) maps Player 2's joystick to Player 1's keys. No more changing seats!

The extracted code (with the formatting gone a bit awry) is as follows:

#!/bin/sh

rom="${3##*/}"

Player1_AdvMame_Sim="sudo /opt/retropie/supplementary/xboxdrv/bin/xboxdrv \
--silent \
--detach-kernel-driver \
--deadzone=4000 \
--deadzone-trigger 15% \
--force-feedback \
--mimic-xpad \
--trigger-as-button \
--ui-buttonmap lb=void,rb=void,tl=void,tr=void,guide=void,lt=void,rt=void \
--evdev /dev/input/by-path/platform-3f980000.usb-usb-0:1.3.3:1.0-event-joystick \
--device-name "Player_1" \
--evdev-absmap ABS_X=y1,ABS_Y=x1 \
--evdev-keymap BTN_TRIGGER=x,BTN_THUMB=y,BTN_THUMB2=a,BTN_PINKIE=b,BTN_BASE3=back,BTN_BASE6=start \
--ui-axismap X1=KEY_LEFT:KEY_RIGHT,Y1=KEY_UP:KEY_DOWN \
--ui-buttonmap a=KEY_LEFTCTRL,b=KEY_LEFTALT,x=KEY_SPACE,y=KEY_LEFTSHIFT,back=KEY_5+KEY_1,start=KEY_6+KEY_2,back+start=KEY_SPACE+KEY_ESC"

Player2_AdvMame_Sim="sudo /opt/retropie/supplementary/xboxdrv/bin/xboxdrv \
--silent \
--detach-kernel-driver \
--deadzone=4000 \
--deadzone-trigger 15% \
--force-feedback \
--mimic-xpad \
--trigger-as-button \
--ui-buttonmap lb=void,rb=void,tl=void,tr=void,guide=void,lt=void,rt=void \
--evdev /dev/input/by-path/platform-3f980000.usb-usb-0:1.3.1:1.0-event-joystick \
--device-name "Player_2" \
--evdev-absmap ABS_X=y1,ABS_Y=x1 \
--evdev-keymap BTN_TRIGGER=y,BTN_THUMB=a,BTN_THUMB2=back,BTN_PINKIE=x,BTN_TOP=b,BTN_TOP2=start \
--ui-axismap X1=KEY_D:KEY_G,Y1=KEY_R:KEY_F \
--ui-buttonmap a=KEY_A,b=KEY_S,x=KEY_Q,y=KEY_W,back=KEY_6+KEY_2,start=KEY_UNKNOWN,back+start=KEY_SPACE+KEY_ESC"

Player1_AdvMame_Alt="sudo /opt/retropie/supplementary/xboxdrv/bin/xboxdrv \
--silent \
--detach-kernel-driver \
--deadzone=4000 \
--deadzone-trigger 15% \
--force-feedback \
--mimic-xpad \
--trigger-as-button \
--ui-buttonmap lb=void,rb=void,tl=void,tr=void,guide=void,lt=void,rt=void \
--evdev /dev/input/by-path/platform-3f980000.usb-usb-0:1.3.3:1.0-event-joystick \
--device-name "Player_1" \
--evdev-absmap ABS_X=y1,ABS_Y=x1 \
--evdev-keymap BTN_TRIGGER=x,BTN_THUMB=y,BTN_THUMB2=a,BTN_PINKIE=b,BTN_BASE3=back,BTN_BASE6=start \
--ui-axismap X1=KEY_LEFT:KEY_RIGHT,Y1=KEY_UP:KEY_DOWN \
--ui-buttonmap a=KEY_LEFTCTRL,b=KEY_LEFTALT,x=KEY_SPACE,y=KEY_LEFTSHIFT,back=KEY_5+KEY_1,start=KEY_6+KEY_2,back+start=KEY_SPACE+KEY_ESC"

Player2_AdvMame_Alt="sudo /opt/retropie/supplementary/xboxdrv/bin/xboxdrv \
--silent \
--detach-kernel-driver \
--deadzone=4000 \
--deadzone-trigger 15% \
--force-feedback \
--mimic-xpad \
--trigger-as-button \
--ui-buttonmap lb=void,rb=void,tl=void,tr=void,guide=void,lt=void,rt=void \
--evdev /dev/input/by-path/platform-3f980000.usb-usb-0:1.3.1:1.0-event-joystick \
--device-name "Player_2" \
--evdev-absmap ABS_X=y1,ABS_Y=x1 \
--evdev-keymap BTN_TRIGGER=y,BTN_THUMB=a,BTN_THUMB2=back,BTN_PINKIE=x,BTN_TOP=b,BTN_TOP2=start \
--ui-axismap X1=KEY_LEFT:KEY_RIGHT,Y1=KEY_UP:KEY_DOWN \
--ui-buttonmap a=KEY_LEFTCTRL,b=KEY_LEFTALT,x=KEY_SPACE,y=KEY_LEFTSHIFT,back=KEY_5+KEY_1,start=KEY_6+KEY_2,back+start=KEY_SPACE+KEY_ESC"

xboxkill="sudo killall xboxdrv"

case $2 in
advmame)
case $rom in
"aerofgt.zip"|"aerofgtb.zip"|"aerofgtc.zip"|"sonicwi2.zip"|"sonicwi3.zip"|"alien3.zip"|"avspu.zip"|"aliens.zip"|"alpham2.zip"|"altbeast.zip"|"altbeas2.zip"|"altbeas4.zip"|"altbeas5.zip"|"altbeaj1.zip"|"altbeaj.zip"|"altbeaj3.zip"|"androdun.zip"|"armwar.zip"|"baddudes.zip"|"batcir.zip"|"btoads.zip"|"bnzabros.zip"|"bublbobl.zip"|"bublbobr.zip"|"bublbob1.zip"|"bublbob2.zip"|"bubblebobbleultra.zip"|"bubblem.zip"|"bubsympe.zip"|"bubsymph.zip"|"bubsympu.zip"|"burnforc.zip"|"burnfrco.zip"|"burningf.zip"|"burningh.zip"|"dino.zip"|"dinoj.zip"|"dinou.zip"|"captaven.zip"|"captavna.zip"|"captavne.zip"|"captavnj.zip"|"captavnu.zip"|"captavuu.zip"|"captcomm.zip"|"captcomu.zip"|"captcomj.zip"|"cawing.zip"|"cawingj.zip"|"cawingr1.zip"|"cawingu.zip"|"edrandy.zip"|"edrandy1.zip"|"edrandyj.zip"|"ctribe.zip"|"ctribeb.zip"|"contra.zip"|"contrab.zip"|"contraj.zip"|"contrajb.zip"|"crimfght.zip"|"crimfgt2.zip"|"crimfgtj.zip"|"crsword.zip"|"darius.zip"|"darius2.zip"|"darius2d.zip"|"dariuse.zip"|"dariusg.zip"|"dariusgj.zip"|"dariusgu.zip"|"dariusgx.zip"|"dariusj.zip"|"dariuso.zip"|"diehard.zip"|"ddrgn2u.zip"|"ddrgnw1.zip"|"ddrago3b.zip"|"ddragon.zip"|"ddragon2.zip"|"ddragon3.zip"|"ddragonb.zip"|"ddragonu.zip"|"ddragonw.zip"|"ddsom.zip"|"ddsoma.zip"|"ddsomj.zip"|"ddsomjr1.zip"|"ddsomr1.zip"|"ddsomr2.zip"|"ddsomu.zip"|"ddsomur1.zip"|"ddtod.zip"|"ddtoda.zip"|"ddtodh.zip"|"ddtodj.zip"|"ddtodjr1.zip"|"ddtodr1.zip"|"ddtodu.zip"|"ddtodur1.zip"|"dynamcop.zip"|"dynwar.zip"|"dynwarj.zip"|"exedexes.zip"|"ffight.zip"|"ffightj.zip"|"ffightj1.zip"|"ffightu.zip"|"ffightua.zip"|"gdarius.zip"|"gdarius2.zip"|"gdariusb.zip"|"gground.zip"|"gaun2pg1.zip"|"gaun2pg2.zip"|"gaun2pr3.zip"|"gaun22p1.zip"|"gaun22pg.zip"|"gaunt2.zip"|"gaunt2g.zip"|"gaunt2p.zip"|"gaunt2pg.zip"|"gaunt2pj.zip"|"gaunt22p.zip"|"gauntdl.zip"|"gauntg.zip"|"gauntgr3.zip"|"gauntgr6.zip"|"gauntgr8.zip"|"gauntj.zip"|"gauntj12.zip"|"gauntr1.zip"|"gauntr2.zip"|"gauntr4.zip"|"gauntr5.zip"|"gauntr7.zip"|"gauntr9.zip"|"gpilots.zip"|"gokuparo.zip"|"goldnax1.zip"|"goldnax2.zip"|"goldnax3.zip"|"goldnaxe.zip"|"goldnaxj.zip"|"goldnaxu.zip"|"ga2.zip"|"ga2j.zip"|"ga2u.zip"|"mt_gaxe.zip"|"mt_gaxe2.zip"|"gwar.zip"|"gwara.zip"|"gwarb.zip"|"gwarj.zip"|"hbarrel.zip"|"hbarrelw.zip"|"iceclimb.zip"|"iceclmbj.zip"|"iceclmrj.zip"|"joust.zip"|"joustr.zip"|"joustwr.zip"|"knights.zip"|"knightsj.zip"|"knightsu.zip"|"lresort.zip"|"lwings.zip"|"lwings2.zip"|"lwingsjp.zip"|"lifefrce.zip"|"lifefrcj.zip"|"mario.zip"|"mariojp.zip"|"mslug.zip"|"mslug2.zip"|"mslug3.zip"|"mslug3b6.zip"|"mslug3n.zip"|"mslug4.zip"|"mslug5.zip"|"mslugx.zip"|"mwalk.zip"|"mwalkbl.zip"|"mwalkj.zip"|"mwalku.zip"|"nbbatman.zip"|"gaiden.zip"|"progear.zip"|"progeara.zip"|"progearj.zip"|"punisher.zip"|"punishrj.zip"|"punishru.zip"|"rampage.zip"|"rampage2.zip"|"rmpgwt.zip"|"rmpgwt11.zip"|"robocop2.zip"|"robocp2j.zip"|"robocp2u.zip"|"rtypeleo.zip"|"rtypelej.zip"|"salamand.zip"|"salamanj.zip"|"salamndr2.zip"|"sengokh.zip"|"sengokmj.zip"|"sengoku.zip"|"sengoku2.zip"|"sengoku3.zip"|"sexyparo.zip"|"shocktro.zip"|"shocktr2.zip"|"sscope2.zip"|"simpsn2p.zip"|"skullfng.zip"|"skykid.zip"|"skykidd.zip"|"skykiddo.zip"|"skykiddx.zip"|"smashtv.zip"|"smashtv4.zip"|"smashtv5.zip"|"smashtv6.zip"|"spclorda.zip"|"spclordb.zip"|"spclordg.zip"|"spclords.zip"|"spidman.zip"|"spidmanu.zip"|"streetsm.zip"|"streets1.zip"|"streetsj.zip"|"streetsw.zip"|"ssriders.zip"|"scobra.zip"|"scobrab.zip"|"scobras.zip"|"scobrase.zip"|"tmnt.zip"|"tmnt2.zip"|"tmnt2a.zip"|"tmnt2pj.zip"|"tmnt2po.zip"|"tmnt22p.zip"|"tmntj.zip"|"tmntu.zip"|"tmntua.zip"|"timecrs2.zip"|"twinbee.zip"|"unsquad.zip"|"vendet2p.zip"|"viostorm.zip"|"viostrma.zip"|"viostrmj.zip"|"viostrmu.zip"|"vcop.zip"|"vcop2.zip"|"wof.zip"|"wofa.zip"|"wofj.zip"|"wofu.zip"|"wow.zip"|"xmen.zip"|"xenophob.zip") # Configuration used only for these 2 Player Co-Operative / Simultaneous ROMs
				$xboxkill
				joycommand="$Player1_AdvMame_Sim & $Player2_AdvMame_Sim &"
				eval $joycommand
			;;
			*) # Configuration for every other ROM in respect of this emulator including 2 Player "hotseating" ROMS
				$xboxkill
				joycommand="$Player1_AdvMame_Alt & $Player2_AdvMame_Alt &"
				eval $joycommand
			;;
		esac
	;;

mediamogul

@spud11

Nice! What was the problem?

spud11

@mediamogul It appears that advmame didn't like me defining the roms eg $TwoPlayerSim. It would only work if the roms were actually listed in the code itself as I've now done. The additional " in conjunction with the | seemed to mess things up.

mediamogul

@spud11

Glad to see you got it working.

I can't say I have any expertise in these things

Sure you can. Your setup is now quite a bit more complex than mine and you're keeping the wheels on the tracks nicely.

spud11

@mediamogul Thanks!

I've figured something else out. Not sure if anyone is using macros yet with xboxdrv but I've got one to work. I wanted to be able to exit Advance Mame without having to press anything other than back+start. I've now achieved this.

In my /opt/retropie/configs/all folder, I've got a file called advmame_exit.macro. I've made that file executable. Its contents are:

send KEY_ESC 1
wait 200
send KEY_DOWN 1
wait 200
send KEY_ENTER 1

In runcommand-onstart.sh, I've added a line to my joystick code for advmame as follows:

--ui-buttonmap back+start=macro:/opt/retropie/configs/all/advmame_exit.macro \

Now if I hold back and press start in Mario Bros for example, it automatically exits the game.

mediamogul

@spud11

Very nice. I've got TexMaster 2009 set to exit this way and I've been meaning to add Advance Mame.

spud11

@mediamogul Thanks. I hadn't heard of Texmaster 2009 before, but it looks like a variant of Tetris which is interesting. I'll take a look at that myself.

I'm once again messing around with the runcommand-onstart, but this time I'm trying to use case $3 in or case $4 in. I'd like to try to use autofire for Defender and Stargate. Because these 2 games have a lot of buttons, I'm trying to automate the "fire" button.

I've looked at the xboxdrv documentation and there are a couple of different references to autofire.

I've first tried getting autofire to work using the commandline. Xboxdrv works, but autofire doesn't. Would you be able to help please? I'm hoping you might have used autofire before in one of your scripts.

I would like the "X" button (which is third button in my set of first rows of 3 buttons) to autofire. It corresponds to my "space" key.

Here is what I've put into commandline:

sudo /opt/retropie/supplementary/xboxdrv/bin/xboxdrv \
--silent \
--detach-kernel-driver \
--deadzone=4000 \
--deadzone-trigger 15% \
--force-feedback \
--mimic-xpad \
--trigger-as-button \
--ui-buttonmap tl=void,tr=void,guide=void \
--evdev /dev/input/by-path/platform-3f980000.usb-usb-0:1.3.3:1.0-event-joystick \
--device-name "Player_1" \
--evdev-absmap ABS_X=y1,ABS_Y=x1 \
--evdev-keymap BTN_THUMB2=a,BTN_PINKIE=b,BTN_TRIGGER=x,BTN_THUMB=y,BTN_TOP2=lb,BTN_TOP=rb,BTN_BASE3=back,BTN_BASE6=start,BTN_BASE2=lt,BTN_BASE5=rt \
--ui-axismap X1=KEY_LEFT:KEY_RIGHT,Y1=KEY_UP:KEY_DOWN \
--ui-buttonmap a=KEY_LEFTCTRL,b=KEY_LEFTALT,x=KEY_SPACE,y=KEY_LEFTSHIFT,lb=KEY_C,rb=KEY_V,back=KEY_5+KEY_1,start=KEY_6+KEY_2,lt=KEY_UNKNOWN,rt=KEY_UNKNOWN \
--autofire X=100 \
--ui-buttonmap back+start=macro:/opt/retropie/configs/all/advmame_exit.macro \
&

I've tried a few variations of that autofire command but no luck. Thanks!

mediamogul

@spud11

I'm hoping you might have used autofire before in one of your scripts.

I have in the past, but I don't currently have anything of my own to reference. I seem to remember it working though. Have you tried a higher number? 100ms might be a bit too fast. If you haven't already, try using 250ms to start, as that is the example given in the man page.

spud11

@mediamogul Thanks. What I did was try --autofire X=250 \. I also removed the keyboard commands from the code leaving just the joystick, just in case there was some incompatibility there. Using TAB in AdvMame, I remapped one of the joystick buttons to "X", but still no autofire. The code from commandline is as follows:

sudo /opt/retropie/supplementary/xboxdrv/bin/xboxdrv \
--silent \
--detach-kernel-driver \
--deadzone=4000 \
--deadzone-trigger 15% \
--force-feedback \
--mimic-xpad \
--trigger-as-button \
--ui-buttonmap tl=void,tr=void,guide=void \
--evdev /dev/input/by-path/platform-3f980000.usb-usb-0:1.3.3:1.0-event-joystick \
--device-name "Player_1" \
--evdev-absmap ABS_X=y1,ABS_Y=x1 \
--evdev-keymap BTN_THUMB2=a,BTN_PINKIE=b,BTN_TRIGGER=x,BTN_THUMB=y,BTN_TOP2=lb,BTN_TOP=rb,BTN_BASE3=back,BTN_BASE6=start,BTN_BASE2=lt,BTN_BASE5=rt \
--autofire X=250 \
--ui-buttonmap back+start=macro:/opt/retropie/configs/all/advmame_exit.macro \
&

Xboxdrv definitely works with this code - no errors. Thanks for your help.

mediamogul

@spud11

Glad to see that worked. I might do a little experimentation to see how low the value can be dropped and make a note of it in the guide.

spud11

@mediamogul Hi mediamogul. Actually, sorry, I didn't explain myself very well. I should have said xboxdrv starts with no errors but the autofire does not work with the code I've supplied.

mediamogul

@spud11

Ah, I see. Well, I'm gonna be gaming a good bit tonight, so I might try to give Stanley a fully automatic upgrade in 'Donkey Kong 3'. I'll let you know how it goes.

spud11

@mediamogul That would be terrific. Thanks. Hopefully, it's something simple I've missed or misunderstood.

mediamogul

@spud11

OK, I can't speak as to whether or not the method you were using is broken in xboxdrv or not, but I was able to find a better and more flexible way of implementing autofire. Using the 'B' button as an example, the following should work the way you want.

--buttonmap b^autofire:100=b

This method would seem to be better all around, as it even allows you to set one button to act as the autofire equivalent of another. For example:

--buttonmap y^autofire:100=b

would mean that the 'B' button could act normally when pressed, while the 'Y' button would autofire 'B' at 100ms intervals. I haven't used any autofire configs before myself, but I have to admit, this would save a lot of blisters while playing 'Silver Surfer'.