-** Introduction\r
-This document describes what I managed to discover about the protocol used to\r
-specify force effects to I-Force 2.0 devices. None of this information comes\r
-from Immerse. That's why you should not trust what is written in this\r
-document. This document is intended to help understanding the protocol.\r
-This is not a reference. Comments and corrections are welcome. To contact me,\r
-send an email to: deneux@ifrance.com\r
-\r
-** WARNING **\r
-I may not be held responsible for any dammage or harm caused if you try to\r
-send data to your I-Force device based on what you read in this document.\r
-\r
-** Preliminary Notes:\r
-All values are hexadecimal with big-endian encoding (msb on the left). Beware,\r
-values inside packets are encoded using little-endian. Bytes whose roles are\r
-unknown are marked ??? Information that needs deeper inspection is marked (?)\r
-\r
-** General form of a packet **\r
-This is how packets look when the device uses the rs232 to communicate.\r
-2B OP LEN DATA CS\r
-CS is the checksum. It is equal to the exclusive or of all bytes.\r
-\r
-When using USB:\r
-OP DATA\r
-The 2B, LEN and CS fields have disappeared, probably because USB handles frames and\r
-data corruption is handled or unsignificant.\r
-\r
-First, I describe effects that are sent by the device to the computer\r
-\r
-** Device input state\r
-This packet is used to indicate the state of each button and the value of each\r
-axis\r
-OP= 01 for a joystick, 03 for a wheel\r
-LEN= Varies from device to device\r
-00 X-Axis lsb\r
-01 X-Axis msb\r
-02 Y-Axis lsb, or gas pedal for a wheel\r
-03 Y-Axis msb, or brake pedal for a wheel\r
-04 Throttle\r
-05 Buttons\r
-06 Lower 4 bits: Buttons\r
- Upper 4 bits: Hat\r
-07 Rudder\r
-\r
-** Device effects states\r
-OP= 02\r
-LEN= Varies\r
-00 ? Bit 1 (Value 2) is the value of the deadman switch\r
-01 Bit 8 is set if the effect is playing. Bits 0 to 7 are the effect id.\r
-02 ??\r
-03 Address of parameter block changed (lsb)\r
-04 Address of parameter block changed (msb)\r
-05 Address of second parameter block changed (lsb)\r
-... depending on the number of parameter blocks updated\r
-\r
-** Force effect **\r
-OP= 01\r
-LEN= 0e\r
-00 Channel (when playing several effects at the same time, each must be assigned a channel)\r
-01 Wave form\r
- Val 00 Constant\r
- Val 20 Square\r
- Val 21 Triangle\r
- Val 22 Sine\r
- Val 23 Sawtooth up\r
- Val 24 Sawtooth down\r
- Val 40 Spring (Force = f(pos))\r
- Val 41 Friction (Force = f(velocity)) and Inertia (Force = f(acceleration))\r
-\r
- \r
-02 Axes affected and trigger\r
- Bits 4-7: Val 2 = effect along one axis. Byte 05 indicates direction\r
- Val 4 = X axis only. Byte 05 must contain 5a\r
- Val 8 = Y axis only. Byte 05 must contain b4\r
- Val c = X and Y axes. Bytes 05 must contain 60\r
- Bits 0-3: Val 0 = No trigger\r
- Val x+1 = Button x triggers the effect\r
- When the whole byte is 0, cancel the previously set trigger\r
-\r
-03-04 Duration of effect (little endian encoding, in ms)\r
-\r
-05 Direction of effect, if applicable. Else, see 02 for value to assign.\r
-\r
-06-07 Minimum time between triggering.\r
-\r
-08-09 Address of periodicity or magnitude parameters\r
-0a-0b Address of attack and fade parameters, or ffff if none.\r
-*or*\r
-08-09 Address of interactive parameters for X-axis, or ffff if not applicable\r
-0a-0b Address of interactive parameters for Y-axis, or ffff if not applicable\r
-\r
-0c-0d Delay before execution of effect (little endian encoding, in ms)\r
-\r
-\r
-** Time based parameters **\r
-\r
-*** Attack and fade ***\r
-OP= 02\r
-LEN= 08\r
-00-01 Address where to store the parameteres\r
-02-03 Duration of attack (little endian encoding, in ms)\r
-04 Level at end of attack. Signed byte.\r
-05-06 Duration of fade.\r
-07 Level at end of fade.\r
-\r
-*** Magnitude ***\r
-OP= 03\r
-LEN= 03\r
-00-01 Address\r
-02 Level. Signed byte.\r
-\r
-*** Periodicity ***\r
-OP= 04\r
-LEN= 07\r
-00-01 Address\r
-02 Magnitude. Signed byte.\r
-03 Offset. Signed byte.\r
-04 Phase. Val 00 = 0 deg, Val 40 = 90 degs.\r
-05-06 Period (little endian encoding, in ms)\r
-\r
-** Interactive parameters **\r
-OP= 05\r
-LEN= 0a\r
-00-01 Address\r
-02 Positive Coeff\r
-03 Negative Coeff\r
-04+05 Offset (center)\r
-06+07 Dead band (Val 01F4 = 5000 (decimal))\r
-08 Positive saturation (Val 0a = 1000 (decimal) Val 64 = 10000 (decimal))\r
-09 Negative saturation\r
-\r
-The encoding is a bit funny here: For coeffs, these are signed values. The\r
-maximum value is 64 (100 decimal), the min is 9c.\r
-For the offset, the minimum value is FE0C, the maximum value is 01F4.\r
-For the deadband, the minimum value is 0, the max is 03E8.\r
-\r
-** Controls **\r
-OP= 41\r
-LEN= 03\r
-00 Channel\r
-01 Start/Stop\r
- Val 00: Stop\r
- Val 01: Start and play once.\r
- Val 41: Start and play n times (See byte 02 below)\r
-02 Number of iterations n.\r
-\r
-** Init **\r
-\r
-*** Querying features ***\r
-OP= ff\r
-Query command. Length varies according to the query type.\r
-The general format of this packet is:\r
-ff 01 QUERY [INDEX] CHECKSUM\r
-reponses are of the same form:\r
-FF LEN QUERY VALUE_QUERIED CHECKSUM2\r
-where LEN = 1 + length(VALUE_QUERIED)\r
-\r
-**** Query ram size ****\r
-QUERY = 42 ('B'uffer size)\r
-The device should reply with the same packet plus two additionnal bytes\r
-containing the size of the memory:\r
-ff 03 42 03 e8 CS would mean that the device has 1000 bytes of ram available.\r
-\r
-**** Query number of effects ****\r
-QUERY = 4e ('N'umber of effects)\r
-The device should respond by sending the number of effects that can be played\r
-at the same time (one byte)\r
-ff 02 4e 14 CS would stand for 20 effects.\r
-\r
-**** Vendor's id ****\r
-QUERY = 4d ('M'anufacturer)\r
-Query the vendors'id (2 bytes)\r
-\r
-**** Product id *****\r
-QUERY = 50 ('P'roduct)\r
-Query the product id (2 bytes)\r
-\r
-**** Open device ****\r
-QUERY = 4f ('O'pen) \r
-No data returned.\r
-\r
-**** Close device *****\r
-QUERY = 43 ('C')lose\r
-No data returned.\r
-\r
-**** Query effect ****\r
-QUERY = 45 ('E') \r
-Send effect type.\r
-Returns nonzero if supported (2 bytes)\r
-\r
-**** Firmware Version ****\r
-QUERY = 56 ('V'ersion)\r
-Sends back 3 bytes - major, minor, subminor\r
-\r
-*** Initialisation of the device ***\r
-\r
-**** Set Control ****\r
-!!! Device dependent, can be different on different models !!!\r
-OP= 40 <idx> <val> [<val>]\r
-LEN= 2 or 3\r
-00 Idx\r
- Idx 00 Set dead zone (0..2048) \r
- Idx 01 Ignore Deadman sensor (0..1) \r
- Idx 02 Enable comm watchdog (0..1) \r
- Idx 03 Set the strength of the spring (0..100) \r
- Idx 04 Enable or disable the spring (0/1)\r
- Idx 05 Set axis saturation threshold (0..2048) \r
-\r
-**** Set Effect State ****\r
-OP= 42 <val>\r
-LEN= 1\r
-00 State\r
- Bit 3 Pause force feedback\r
- Bit 2 Enable force feedback\r
- Bit 0 Stop all effects\r
-\r
-**** Set overall gain ****\r
-OP= 43 <val>\r
-LEN= 1\r
-00 Gain\r
- Val 00 = 0%\r
- Val 40 = 50%\r
- Val 80 = 100%\r
-\r
-** Parameter memory **\r
-\r
-Each device has a certain amount of memory to store parameters of effects.\r
-The amount of RAM may vary, I encountered values from 200 to 1000 bytes. Below\r
-is the amount of memory apparently needed for every set of parameters:\r
- - period : 0c\r
- - magnitude : 02\r
- - attack and fade : 0e\r
- - interactive : 08\r
-\r
-** Appendix: How to study the protocol ? **\r
-\r
-1. Generate effects using the force editor provided with the DirectX SDK, or use Immersion Studio (freely available at their web site in the developer section: www.immersion.com)\r
-2. Start a soft spying RS232 or USB (depending on where you connected your joystick/wheel). I used ComPortSpy from fCoder (alpha version!)\r
-3. Play the effect, and watch what happens on the spy screen.\r
-\r
-A few words about ComPortSpy:\r
-At first glance, this soft seems, hum, well... buggy. In fact, data appear with a few seconds latency. Personnaly, I restart it every time I play an effect.\r
-Remember it's free (as in free beer) and alpha!\r
-\r
-** URLS **\r
-Check www.immerse.com for Immersion Studio, and www.fcoder.com for ComPortSpy.\r
-\r
-** Author of this document **\r
-Johann Deneux <deneux@ifrance.com>\r
-Home page at http://www.esil.univ-mrs.fr/~jdeneux/projects/ff/\r
-\r
-Additions by Vojtech Pavlik.\r
-\r
-I-Force is trademark of Immersion Corp.\r
+** Introduction
+This document describes what I managed to discover about the protocol used to
+specify force effects to I-Force 2.0 devices. None of this information comes
+from Immerse. That's why you should not trust what is written in this
+document. This document is intended to help understanding the protocol.
+This is not a reference. Comments and corrections are welcome. To contact me,
+send an email to: johann.deneux@gmail.com
+
+** WARNING **
+I shall not be held responsible for any damage or harm caused if you try to
+send data to your I-Force device based on what you read in this document.
+
+** Preliminary Notes:
+All values are hexadecimal with big-endian encoding (msb on the left). Beware,
+values inside packets are encoded using little-endian. Bytes whose roles are
+unknown are marked ??? Information that needs deeper inspection is marked (?)
+
+** General form of a packet **
+This is how packets look when the device uses the rs232 to communicate.
+2B OP LEN DATA CS
+CS is the checksum. It is equal to the exclusive or of all bytes.
+
+When using USB:
+OP DATA
+The 2B, LEN and CS fields have disappeared, probably because USB handles frames and
+data corruption is handled or unsignificant.
+
+First, I describe effects that are sent by the device to the computer
+
+** Device input state
+This packet is used to indicate the state of each button and the value of each
+axis
+OP= 01 for a joystick, 03 for a wheel
+LEN= Varies from device to device
+00 X-Axis lsb
+01 X-Axis msb
+02 Y-Axis lsb, or gas pedal for a wheel
+03 Y-Axis msb, or brake pedal for a wheel
+04 Throttle
+05 Buttons
+06 Lower 4 bits: Buttons
+ Upper 4 bits: Hat
+07 Rudder
+
+** Device effects states
+OP= 02
+LEN= Varies
+00 ? Bit 1 (Value 2) is the value of the deadman switch
+01 Bit 8 is set if the effect is playing. Bits 0 to 7 are the effect id.
+02 ??
+03 Address of parameter block changed (lsb)
+04 Address of parameter block changed (msb)
+05 Address of second parameter block changed (lsb)
+... depending on the number of parameter blocks updated
+
+** Force effect **
+OP= 01
+LEN= 0e
+00 Channel (when playing several effects at the same time, each must be assigned a channel)
+01 Wave form
+ Val 00 Constant
+ Val 20 Square
+ Val 21 Triangle
+ Val 22 Sine
+ Val 23 Sawtooth up
+ Val 24 Sawtooth down
+ Val 40 Spring (Force = f(pos))
+ Val 41 Friction (Force = f(velocity)) and Inertia (Force = f(acceleration))
+
+
+02 Axes affected and trigger
+ Bits 4-7: Val 2 = effect along one axis. Byte 05 indicates direction
+ Val 4 = X axis only. Byte 05 must contain 5a
+ Val 8 = Y axis only. Byte 05 must contain b4
+ Val c = X and Y axes. Bytes 05 must contain 60
+ Bits 0-3: Val 0 = No trigger
+ Val x+1 = Button x triggers the effect
+ When the whole byte is 0, cancel the previously set trigger
+
+03-04 Duration of effect (little endian encoding, in ms)
+
+05 Direction of effect, if applicable. Else, see 02 for value to assign.
+
+06-07 Minimum time between triggering.
+
+08-09 Address of periodicity or magnitude parameters
+0a-0b Address of attack and fade parameters, or ffff if none.
+*or*
+08-09 Address of interactive parameters for X-axis, or ffff if not applicable
+0a-0b Address of interactive parameters for Y-axis, or ffff if not applicable
+
+0c-0d Delay before execution of effect (little endian encoding, in ms)
+
+
+** Time based parameters **
+
+*** Attack and fade ***
+OP= 02
+LEN= 08
+00-01 Address where to store the parameteres
+02-03 Duration of attack (little endian encoding, in ms)
+04 Level at end of attack. Signed byte.
+05-06 Duration of fade.
+07 Level at end of fade.
+
+*** Magnitude ***
+OP= 03
+LEN= 03
+00-01 Address
+02 Level. Signed byte.
+
+*** Periodicity ***
+OP= 04
+LEN= 07
+00-01 Address
+02 Magnitude. Signed byte.
+03 Offset. Signed byte.
+04 Phase. Val 00 = 0 deg, Val 40 = 90 degs.
+05-06 Period (little endian encoding, in ms)
+
+** Interactive parameters **
+OP= 05
+LEN= 0a
+00-01 Address
+02 Positive Coeff
+03 Negative Coeff
+04+05 Offset (center)
+06+07 Dead band (Val 01F4 = 5000 (decimal))
+08 Positive saturation (Val 0a = 1000 (decimal) Val 64 = 10000 (decimal))
+09 Negative saturation
+
+The encoding is a bit funny here: For coeffs, these are signed values. The
+maximum value is 64 (100 decimal), the min is 9c.
+For the offset, the minimum value is FE0C, the maximum value is 01F4.
+For the deadband, the minimum value is 0, the max is 03E8.
+
+** Controls **
+OP= 41
+LEN= 03
+00 Channel
+01 Start/Stop
+ Val 00: Stop
+ Val 01: Start and play once.
+ Val 41: Start and play n times (See byte 02 below)
+02 Number of iterations n.
+
+** Init **
+
+*** Querying features ***
+OP= ff
+Query command. Length varies according to the query type.
+The general format of this packet is:
+ff 01 QUERY [INDEX] CHECKSUM
+responses are of the same form:
+FF LEN QUERY VALUE_QUERIED CHECKSUM2
+where LEN = 1 + length(VALUE_QUERIED)
+
+**** Query ram size ****
+QUERY = 42 ('B'uffer size)
+The device should reply with the same packet plus two additional bytes
+containing the size of the memory:
+ff 03 42 03 e8 CS would mean that the device has 1000 bytes of ram available.
+
+**** Query number of effects ****
+QUERY = 4e ('N'umber of effects)
+The device should respond by sending the number of effects that can be played
+at the same time (one byte)
+ff 02 4e 14 CS would stand for 20 effects.
+
+**** Vendor's id ****
+QUERY = 4d ('M'anufacturer)
+Query the vendors'id (2 bytes)
+
+**** Product id *****
+QUERY = 50 ('P'roduct)
+Query the product id (2 bytes)
+
+**** Open device ****
+QUERY = 4f ('O'pen)
+No data returned.
+
+**** Close device *****
+QUERY = 43 ('C')lose
+No data returned.
+
+**** Query effect ****
+QUERY = 45 ('E')
+Send effect type.
+Returns nonzero if supported (2 bytes)
+
+**** Firmware Version ****
+QUERY = 56 ('V'ersion)
+Sends back 3 bytes - major, minor, subminor
+
+*** Initialisation of the device ***
+
+**** Set Control ****
+!!! Device dependent, can be different on different models !!!
+OP= 40 <idx> <val> [<val>]
+LEN= 2 or 3
+00 Idx
+ Idx 00 Set dead zone (0..2048)
+ Idx 01 Ignore Deadman sensor (0..1)
+ Idx 02 Enable comm watchdog (0..1)
+ Idx 03 Set the strength of the spring (0..100)
+ Idx 04 Enable or disable the spring (0/1)
+ Idx 05 Set axis saturation threshold (0..2048)
+
+**** Set Effect State ****
+OP= 42 <val>
+LEN= 1
+00 State
+ Bit 3 Pause force feedback
+ Bit 2 Enable force feedback
+ Bit 0 Stop all effects
+
+**** Set overall gain ****
+OP= 43 <val>
+LEN= 1
+00 Gain
+ Val 00 = 0%
+ Val 40 = 50%
+ Val 80 = 100%
+
+** Parameter memory **
+
+Each device has a certain amount of memory to store parameters of effects.
+The amount of RAM may vary, I encountered values from 200 to 1000 bytes. Below
+is the amount of memory apparently needed for every set of parameters:
+ - period : 0c
+ - magnitude : 02
+ - attack and fade : 0e
+ - interactive : 08
+
+** Appendix: How to study the protocol ? **
+
+1. Generate effects using the force editor provided with the DirectX SDK, or
+use Immersion Studio (freely available at their web site in the developer section:
+www.immersion.com)
+2. Start a soft spying RS232 or USB (depending on where you connected your
+joystick/wheel). I used ComPortSpy from fCoder (alpha version!)
+3. Play the effect, and watch what happens on the spy screen.
+
+A few words about ComPortSpy:
+At first glance, this software seems, hum, well... buggy. In fact, data appear with a
+few seconds latency. Personally, I restart it every time I play an effect.
+Remember it's free (as in free beer) and alpha!
+
+** URLS **
+Check www.immerse.com for Immersion Studio, and www.fcoder.com for ComPortSpy.
+
+** Author of this document **
+Johann Deneux <johann.deneux@gmail.com>
+Home page at http://www.esil.univ-mrs.fr/~jdeneux/projects/ff/
+
+Additions by Vojtech Pavlik.
+
+I-Force is trademark of Immersion Corp.
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff