J1939 stacks for the LPC2xxx's?
2005-04-18 by gregdeuerling
Does anyone know of any J1939 stacks that can be used with the Philips LPC2xxx uC's. I've Googled around a bit but have not found anything yet... Thanks!
Thread
J1939 stacks for the LPC2xxx's?
Re: J1939 stacks for the LPC2xxx's?
2006-01-06 by andrebesselsen@hotmail.com
Anybody already found some J1939 code? I am working on my little hobby project to fool a trucks' speed limiter and I would really appreciate it if anybody could give some help to start up with a LPC2129. I do have pretty much knowledge of SAE J1939, but my knowledge about embedded programming is not (yet) enough. Regards, Andr\ufffd The Neterlands
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> > >Does anyone know of any J1939 stacks that can be used with the Philips >LPC2xxx uC's. I've Googled around a bit but have not found anything >yet... > >Thanks! > > > > > >
Re: [lpc2000] Re: J1939 stacks for the LPC2xxx's?
2006-01-06 by Onestone
This is more like a job for a 6 pin PIC10 than a 32bit ARM part. You really don't need to get into the intricacies of internal communications, this is total overkill. The simplest way is to mess with the singal from the (normally) gear box directly. However this will be a) breaking the law, b) voiding any warranty, and c) potentially life threatening to other road users, so I would strongly recommend it be something you NOT try. If I were to do this personally, say for the sake of racing said truck, in legitimate competition, I would intercept the speed signal coming from the gear box and output my own 'scaled' signal. In most cases you can leave this alone until you approach the limit. In most ECU's I've seen (these were mainly cars, not trucks) the speed signal was not used for engine management, except to limit the vehicle speed, so by altering it you should not alter performance of the ECU or vehicle in any other way. This also means you can interfere with the signla just before the programmed limit is reached. The micro will monitor this, and as the limit is approached it will take over the and generate its own speed signal for the ECU, and maintain this below the limit. The downside to this is inaccurate speedometer, odometer, and any fuel/trip type computers. I would either see if these circuits are separately serviced by the singla, and, if so, only interfere with the feed to the ECU for speed limiting, or I would pass the true signal to a display which could then show the actual roadspeed vs the 'modified' one. That's of course if I ever got into truck racing. Which is unlikely. Cheers Al andrebesselsen@... wrote:
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>Anybody already found some J1939 code? > >I am working on my little hobby project to fool a trucks' speed limiter and I would really appreciate it if anybody could give some help to start up with a LPC2129. I do have pretty much knowledge of SAE J1939, but my knowledge about embedded programming is not (yet) enough. > >Regards, > >Andr\ufffd > >The Neterlands > > > >> >> >>Does anyone know of any J1939 stacks that can be used with the Philips >>LPC2xxx uC's. I've Googled around a bit but have not found anything >>yet... >> >>Thanks! >> >> >> >> >> >> >> >> > > > >Yahoo! Groups Links > > > > > > > > > >
Re: [lpc2000] Re: J1939 stacks for the LPC2xxx's?
2006-01-06 by Sean
Do you know anything about J1850 (OBDII)? -- Sean At 07:44 AM 1/6/2006, you wrote:
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>Anybody already found some J1939 code? > >I am working on my little hobby project to fool a trucks' speed limiter >and I would really appreciate it if anybody could give some help to start >up with a LPC2129. I do have pretty much knowledge of SAE J1939, but my >knowledge about embedded programming is not (yet) enough. > >Regards, > >André > >The Neterlands > > >Does anyone know of any J1939 stacks that can be used with the Philips > >LPC2xxx uC's. I've Googled around a bit but have not found anything > >yet... > > > >Thanks!
RE: [lpc2000] Re: J1939 stacks for the LPC2xxx's?
2006-01-06 by Randy M. Dumse
> Do you know anything about J1850 (OBDII)? What do you need to know? I've done keyword protocol. Randy www.newmicros.com
RE: [lpc2000] Re: J1939 stacks for the LPC2xxx's?
2006-01-06 by Greg Deuerling
> -----Original Message----- > From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf > Of Randy M. Dumse > Sent: Friday, January 06, 2006 3:37 PM > To: lpc2000@yahoogroups.com > Subject: RE: [lpc2000] Re: J1939 stacks for the LPC2xxx's? > > > Do you know anything about J1850 (OBDII)? > > What do you need to know? I've done keyword protocol. > > Randy > www.newmicros.com I'm a "me too" on this topic :) Is there any documentation out there on how to get info from an OBDII port? I had a OBDII scanner hooked up to a Ford truck at one time and was able to figure out a few commands like oil temp, tran temp, ... It would be nice if there was a document that covered all of the commands. I've Googled quite a bit on the subject and have come up with nothing. Thanks for any info you could give out!!! Greg Deuerling
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> -----Original Message----- > From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf > Of Randy M. Dumse > Sent: Friday, January 06, 2006 3:37 PM > To: lpc2000@yahoogroups.com > Subject: RE: [lpc2000] Re: J1939 stacks for the LPC2xxx's? > > > Do you know anything about J1850 (OBDII)? > > What do you need to know? I've done keyword protocol. > > Randy > www.newmicros.com > > > > > > Yahoo! Groups Links > > > > > >
Re: [lpc2000] Re: J1939 stacks for the LPC2xxx's?
2006-01-06 by Onestone
This gleaned from agoogle for J1850 COMMANDS. tHE 808 MENTIONED IS A gENERAL mOTORS hOLDEN (aUSTRALIAN) vehicle. maybe this will be of some help. Cheers Al > >Bruce >The fault code 22 you saw was TPS voltage too low. >My manual says that this code is set if TPS voltage falls below 0.15V > >Here is a list of all 808 Fault codes. > >12 System Functioning OK >13 Oxygen sensor Open Circuit >14 CTS low ( <0.7V) >15 CTS High (>4.65) >21 TPS High (>2.5V and MAP <60kPa fot 2 secs) >22 TPS Low (<0.15V) >23 MAT High (>4.9V) >24 VSS Error >25 MAT Low (<0.3V) >33 MAP High >34 MAP Low >41 No Refrence Pulse >42 EST Failure >43 Knock Sensor open or shorted >44 Oxygen sensor low (<0.25V, >20Sec) >45 Oxygen sensor high (>0.45V, >20Sec) >51 MEMCAL Error >55 A to D error (>5.5V) > >Hope that this helps >Cheers >Matt Greg Deuerling wrote:
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>>-----Original Message----- >>From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf >>Of Randy M. Dumse >>Sent: Friday, January 06, 2006 3:37 PM >>To: lpc2000@yahoogroups.com >>Subject: RE: [lpc2000] Re: J1939 stacks for the LPC2xxx's? >> >> >> >>>Do you know anything about J1850 (OBDII)? >>> >>> >>What do you need to know? I've done keyword protocol. >> >>Randy >>www.newmicros.com >> >> > >I'm a "me too" on this topic :) > >Is there any documentation out there on how to get info from an OBDII port? >I had a OBDII scanner hooked up to a Ford truck at one time and was able to >figure out a few commands like oil temp, tran temp, ... It would be nice if >there was a document that covered all of the commands. I've Googled quite a >bit on the subject and have come up with nothing. > >Thanks for any info you could give out!!! > > >Greg Deuerling > > > >>-----Original Message----- >>From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf >>Of Randy M. Dumse >>Sent: Friday, January 06, 2006 3:37 PM >>To: lpc2000@yahoogroups.com >>Subject: RE: [lpc2000] Re: J1939 stacks for the LPC2xxx's? >> >> >> >>>Do you know anything about J1850 (OBDII)? >>> >>> >>What do you need to know? I've done keyword protocol. >> >>Randy >>www.newmicros.com >> >> >> >> >> >>Yahoo! Groups Links >> >> >> >> >> >> >> >> > > > > > > >Yahoo! Groups Links > > > > > > > > > >
Re: [lpc2000] Re: J1939 stacks for the LPC2xxx's?
2006-01-06 by Onestone
For a more complete listing I came across this for Jeep using search string "J1850 MESSAGES". This got loads more hits than other efforts. http://www.stu-offroad.com/engine/scancodes.htm Cheers Al Onestone wrote:
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>This gleaned from agoogle for J1850 COMMANDS. tHE 808 MENTIONED IS A >gENERAL mOTORS hOLDEN (aUSTRALIAN) vehicle. > >maybe this will be of some help. > >Cheers > >Al > > > >>Bruce >>The fault code 22 you saw was TPS voltage too low. >>My manual says that this code is set if TPS voltage falls below 0.15V >> >>Here is a list of all 808 Fault codes. >> >>12 System Functioning OK >>13 Oxygen sensor Open Circuit >>14 CTS low ( <0.7V) >>15 CTS High (>4.65) >>21 TPS High (>2.5V and MAP <60kPa fot 2 secs) >>22 TPS Low (<0.15V) >>23 MAT High (>4.9V) >>24 VSS Error >>25 MAT Low (<0.3V) >>33 MAP High >>34 MAP Low >>41 No Refrence Pulse >>42 EST Failure >>43 Knock Sensor open or shorted >>44 Oxygen sensor low (<0.25V, >20Sec) >>45 Oxygen sensor high (>0.45V, >20Sec) >>51 MEMCAL Error >>55 A to D error (>5.5V) >> >>Hope that this helps >>Cheers >>Matt >> >> > > > >Greg Deuerling wrote: > > > >>>-----Original Message----- >>>From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf >>>Of Randy M. Dumse >>>Sent: Friday, January 06, 2006 3:37 PM >>>To: lpc2000@yahoogroups.com >>>Subject: RE: [lpc2000] Re: J1939 stacks for the LPC2xxx's? >>> >>> >>> >>> >>> >>>>Do you know anything about J1850 (OBDII)? >>>> >>>> >>>> >>>> >>>What do you need to know? I've done keyword protocol. >>> >>>Randy >>>www.newmicros.com >>> >>> >>> >>> >>I'm a "me too" on this topic :) >> >>Is there any documentation out there on how to get info from an OBDII port? >>I had a OBDII scanner hooked up to a Ford truck at one time and was able to >>figure out a few commands like oil temp, tran temp, ... It would be nice if >>there was a document that covered all of the commands. I've Googled quite a >>bit on the subject and have come up with nothing. >> >>Thanks for any info you could give out!!! >> >> >>Greg Deuerling >> >> >> >> >> >>>-----Original Message----- >>>From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf >>>Of Randy M. Dumse >>>Sent: Friday, January 06, 2006 3:37 PM >>>To: lpc2000@yahoogroups.com >>>Subject: RE: [lpc2000] Re: J1939 stacks for the LPC2xxx's? >>> >>> >>> >>> >>> >>>>Do you know anything about J1850 (OBDII)? >>>> >>>> >>>> >>>> >>>What do you need to know? I've done keyword protocol. >>> >>>Randy >>>www.newmicros.com >>> >>> >>> >>> >>> >>>Yahoo! Groups Links >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >> >> >> >> >>Yahoo! Groups Links >> >> >> >> >> >> >> >> >> >> >> >> > > > > >Yahoo! Groups Links > > > > > > > > > >
RE: [lpc2000] Re: J1939 stacks for the LPC2xxx's?
2006-01-06 by Greg Deuerling
> -----Original Message----- > From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf > Of Onestone > Sent: Friday, January 06, 2006 4:03 PM > To: lpc2000@yahoogroups.com > Subject: Re: [lpc2000] Re: J1939 stacks for the LPC2xxx's? > > This gleaned from agoogle for J1850 COMMANDS. tHE 808 MENTIONED IS A > gENERAL mOTORS hOLDEN (aUSTRALIAN) vehicle. > > maybe this will be of some help. Thanks for the reply, I've found tons of OBDII diagnostic code info but nothing on how to get the code. From my fiddling around with an OBDII scanner and a laptop with a USB CAN interface OBDII is command driven protocol. If I want the transmission temperature I have to send a CAN packet with a certain ID, then the engine controller sends the response back in a different CAN packet. I was able to get the scanner to just read trans temp and nothing else. I then saw two CAN packets on the OBDII bus. I was then able to determine which packet was the actual command and which packet was the response by using my laptop to send a command. With the scanners help I was able to figure out which bytes in the packet was the tran temp data and what math I had to do to get the actual temperature. So I guess in short, what I need are the commands that get the codes. I've found enough info to figure out the codes. Thanks again! Greg Deuerling
RE: [lpc2000] Re: J1939 stacks for the LPC2xxx's?
2006-01-06 by Sean
Basically one of the main purposes of my project is to interface with the OBDII port on you car to do various things. Right now I'm stuck using a chip from Elm Electronics -- great chip, but expensive. I'd much rather handle the OBDII communications myself, but I don't have the $$$ to buy the documentation. The Elm part itself is a $2 PIC, so it can't be that difficult. -- Sean At 04:37 PM 1/6/2006, you wrote:
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> > Do you know anything about J1850 (OBDII)? > >What do you need to know? I've done keyword protocol. > >Randy >www.newmicros.com
RE: [lpc2000] [OT] J1939 stacks for the LPC2xxx's?
2006-01-06 by Sean
That's the thing, I don't think there is any free information out there. You have to pay $$$ to get the docs. What did you manage to find out? Raw commands? If I knew how to build a simple bus monitor that could monitor the traffic (probably not difficult) then I could probably reverse engineer something (as I'm sure most of you could as well). In any case, I too am looking for info. Elm Electronics has a good interface chip, but it's $$$ as well. -- Sean At 04:49 PM 1/6/2006, you wrote:
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> > -----Original Message----- > > From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf > > Of Randy M. Dumse > > Sent: Friday, January 06, 2006 3:37 PM > > To: lpc2000@yahoogroups.com > > Subject: RE: [lpc2000] Re: J1939 stacks for the LPC2xxx's? > > > > > Do you know anything about J1850 (OBDII)? > > > > What do you need to know? I've done keyword protocol. > > > > Randy > > www.newmicros.com > >I'm a "me too" on this topic :) > >Is there any documentation out there on how to get info from an OBDII port? >I had a OBDII scanner hooked up to a Ford truck at one time and was able to >figure out a few commands like oil temp, tran temp, ... It would be nice if >there was a document that covered all of the commands. I've Googled quite a >bit on the subject and have come up with nothing. > >Thanks for any info you could give out!!! > > >Greg Deuerling
RE: [lpc2000] Re: J1939 stacks for the LPC2xxx's?
2006-01-06 by Greg Deuerling
> -----Original Message----- > From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf > Of Sean > Sent: Friday, January 06, 2006 4:48 PM > To: lpc2000@yahoogroups.com > Subject: RE: [lpc2000] Re: J1939 stacks for the LPC2xxx's? > > Basically one of the main purposes of my project is to interface with the > OBDII port on you car to do various things. Right now I'm stuck using a > chip from Elm Electronics -- great chip, but expensive. I'd much rather > handle the OBDII communications myself, but I don't have the $$$ to buy > the documentation. The Elm part itself is a $2 PIC, so it can't be that > difficult. Do you know where to purchase the documentation? I've not even figured that out yet... Greg Deuerling
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> -----Original Message----- > From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf > Of Sean > Sent: Friday, January 06, 2006 4:48 PM > To: lpc2000@yahoogroups.com > Subject: RE: [lpc2000] Re: J1939 stacks for the LPC2xxx's? > > > Basically one of the main purposes of my project is to interface with the > OBDII port on you car to do various things. Right now I'm stuck using a > chip from Elm Electronics -- great chip, but expensive. I'd much rather > handle the OBDII communications myself, but I don't have the $$$ to buy > the > documentation. The Elm part itself is a $2 PIC, so it can't be that > difficult. > > -- Sean > > At 04:37 PM 1/6/2006, you wrote: > > > Do you know anything about J1850 (OBDII)? > > > >What do you need to know? I've done keyword protocol. > > > >Randy > >www.newmicros.com > > > > > Yahoo! Groups Links > > > > > >
Re: [lpc2000] [OT] J1939 stacks for the LPC2xxx's?
2006-01-06 by Sean
It's not the scancodes themselves we're looking for, but the command interface to the car computer. Thanks though. -- Sean At 05:12 PM 1/6/2006, you wrote:
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>For a more complete listing I came across this for Jeep using search >string "J1850 MESSAGES". This got loads more hits than other efforts. > ><http://www.stu-offroad.com/engine/scancodes.htm>http://www.stu-offroad.com/engine/scancodes.htm > >Cheers > >Al > >Onestone wrote: > > >This gleaned from agoogle for J1850 COMMANDS. tHE 808 MENTIONED IS A > >gENERAL mOTORS hOLDEN (aUSTRALIAN) vehicle. > > > >maybe this will be of some help. > > > >Cheers > > > >Al > > > >>Bruce > >>The fault code 22 you saw was TPS voltage too low. > >>My manual says that this code is set if TPS voltage falls below 0.15V > >> > >>Here is a list of all 808 Fault codes. > >> > >>12 System Functioning OK > >>13 Oxygen sensor Open Circuit > >>14 CTS low ( <0.7V) > >>15 CTS High (>4.65) > >>21 TPS High (>2.5V and MAP <60kPa fot 2 secs) > >>22 TPS Low (<0.15V) > >>23 MAT High (>4.9V) > >>24 VSS Error > >>25 MAT Low (<0.3V) > >>33 MAP High > >>34 MAP Low > >>41 No Refrence Pulse > >>42 EST Failure > >>43 Knock Sensor open or shorted > >>44 Oxygen sensor low (<0.25V, >20Sec) > >>45 Oxygen sensor high (>0.45V, >20Sec) > >>51 MEMCAL Error > >>55 A to D error (>5.5V) > >> > >>Hope that this helps > >>Cheers > >>Matt > > > >Greg Deuerling wrote: > > > >>>-----Original Message----- > >>>From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf > >>>Of Randy M. Dumse > >>>Sent: Friday, January 06, 2006 3:37 PM > >>>To: lpc2000@yahoogroups.com > >>>Subject: RE: [lpc2000] Re: J1939 stacks for the LPC2xxx's? > >>> > >>>>Do you know anything about J1850 (OBDII)? > >>>> > >>>What do you need to know? I've done keyword protocol. > >>> > >>>Randy > >>>www.newmicros.com > >>> > >>I'm a "me too" on this topic :) > >> > >>Is there any documentation out there on how to get info from an OBDII port? > >>I had a OBDII scanner hooked up to a Ford truck at one time and was able to > >>figure out a few commands like oil temp, tran temp, ... It would be > nice if > >>there was a document that covered all of the commands. I've Googled > quite a > >>bit on the subject and have come up with nothing. > >> > >>Thanks for any info you could give out!!! > >> > >> > >>Greg Deuerling > >> > >>>-----Original Message----- > >>>From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf > >>>Of Randy M. Dumse > >>>Sent: Friday, January 06, 2006 3:37 PM > >>>To: lpc2000@yahoogroups.com > >>>Subject: RE: [lpc2000] Re: J1939 stacks for the LPC2xxx's? > >>> > >>>>Do you know anything about J1850 (OBDII)? > >>>> > >>>What do you need to know? I've done keyword protocol. > >>> > >>>Randy > >>>www.newmicros.com
RE: [lpc2000] [OT] J1939 stacks for the LPC2xxx's?
2006-01-06 by Randy M. Dumse
> That's the thing, I don't think there is any free > information out > there. You have to pay $$$ to get the docs. I would have said the same thing. But wouldn't you know it, Wikipedia to the rescue. A good start anyway. Think the book I had was SAE 2012. http://en.wikipedia.org/wiki/OBD-II Randy www.newmicros.com
RE: [lpc2000] Re: J1939 stacks for the LPC2xxx's?
2006-01-06 by Randy M. Dumse
> I'm a "me too" on this topic :) Start with SAE http://www.sae.org/servlets/index We had a large standards book from them (iirc) that described all the protocols, the key codes, and what code meant what. As I recall it was like $200. I sent it back at the end of the project, so I'm asking my customer for details, perhaps an ISBN. There are a number of interfaces, I think one is VPW, PWM and ISO9141 Iso 14230 (Keyword 2000, or KWP, the one I used) Yes, look at http://obddiagnostics.com/ . We bought one of those scan tools and it worked nicely for looking at the traffic. They even have a schematic of their hardware. More information in their programmers guide. We also used http://www.intrepidcs.com/neoVI/networkProtocols.htm to look at the CAN bus traffic. They mention J1939 compatibiliity, but I didn't use it. Randy www.newmicros.com
RE: [lpc2000] Re: J1939 stacks for the LPC2xxx's?
2006-01-06 by Joel Winarske
Hi André, > >I am working on my little hobby project to fool a trucks' speed limiter > and I would really appreciate it if anybody could give some help to start > up with a LPC2129. I do have pretty much knowledge of SAE J1939, but my > knowledge about embedded programming is not (yet) enough. I designed a suite of RV-C based products. RV-C is a thin layer on top of J1939. I evaluated the LPC2129 but required J1939 support would not fit. You can fit a much stripped version of J1939 on the LPC2129. The commercial offerings for J1939 stacks run from $5kUS to $18kUS+. Quality varies widely. Microchip has a J1939 implementation (cough...hack) for zero cost. I would avoid this unless implementing a proprietary closed loop system that doesn't involve life safety. I would never trust my life on random free code. Regards, Joel Winarske ------------------------------------ Independent Electronics, Inc. Joel Winarske Systems Architect joelw@indyelectronics.com 2248 Morlan Drive Napa, CA 94558 tel: (707) 320-4271 fax: (408) 516-5978 Timezone: GMT -08:00 ------------------------------------
Re: [lpc2000] [OT] J1939 stacks for the LPC2xxx's?
2006-01-06 by Sean
Hmm, is this it: http://www.sae.org/servlets/productDetail?PROD_TYP=STD&PROD_CD=J1850_200105 I'm not 100% sure, but I remember looking at this a year or so ago and it was like > $1000 for documentation. -- Sean At 05:50 PM 1/6/2006, you wrote:
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> > -----Original Message----- > > From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf > > Of Sean > > Sent: Friday, January 06, 2006 4:48 PM > > To: lpc2000@yahoogroups.com > > Subject: RE: [lpc2000] Re: J1939 stacks for the LPC2xxx's? > > > > Basically one of the main purposes of my project is to interface with the > > OBDII port on you car to do various things. Right now I'm stuck using a > > chip from Elm Electronics -- great chip, but expensive. I'd much rather > > handle the OBDII communications myself, but I don't have the $$$ to buy > > the documentation. The Elm part itself is a $2 PIC, so it can't be that > > difficult. > >Do you know where to purchase the documentation? >I've not even figured that out yet... > >Greg Deuerling
RE: [lpc2000] [OT] J1939 stacks for the LPC2xxx's?
2006-01-06 by Joel Winarske
J1850 and J1939 are not related in any way. Please rename thread. Joel
Re: [lpc2000] [OT] J1939 stacks for the LPC2xxx's?
2006-01-07 by Onestone
http://www.okisemi.com/datadocs/doc-eng/msm6636_ug.pdf This describes a part that is used to implement the protocol, I haven't looked at it in any depth, but it may help. Al Sean wrote:
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>That's the thing, I don't think there is any free information out >there. You have to pay $$$ to get the docs. What did you manage to find >out? Raw commands? If I knew how to build a simple bus monitor that could >monitor the traffic (probably not difficult) then I could probably reverse >engineer something (as I'm sure most of you could as well). > >In any case, I too am looking for info. Elm Electronics has a good >interface chip, but it's $$$ as well. > >-- Sean > >At 04:49 PM 1/6/2006, you wrote: > > > >>>-----Original Message----- >>>From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf >>>Of Randy M. Dumse >>>Sent: Friday, January 06, 2006 3:37 PM >>>To: lpc2000@yahoogroups.com >>>Subject: RE: [lpc2000] Re: J1939 stacks for the LPC2xxx's? >>> >>> >>> >>>>Do you know anything about J1850 (OBDII)? >>>> >>>> >>>What do you need to know? I've done keyword protocol. >>> >>>Randy >>>www.newmicros.com >>> >>> >>I'm a "me too" on this topic :) >> >>Is there any documentation out there on how to get info from an OBDII port? >>I had a OBDII scanner hooked up to a Ford truck at one time and was able to >>figure out a few commands like oil temp, tran temp, ... It would be nice if >>there was a document that covered all of the commands. I've Googled quite a >>bit on the subject and have come up with nothing. >> >>Thanks for any info you could give out!!! >> >> >>Greg Deuerling >> >> > > > > >Yahoo! Groups Links > > > > > > > > > >
Re: [lpc2000] Re: J1939 stacks for the LPC2xxx's?
2006-01-07 by Onestone
Or This:-
http://vehicleinterface.com/assets/files/m1939stb.pdf
or
www.mywiseowl.com
which advertises free information about J1939, J1850 etc.
Al
Sean wrote:Show quoted textHide quoted text
>Basically one of the main purposes of my project is to interface with the >OBDII port on you car to do various things. Right now I'm stuck using a >chip from Elm Electronics -- great chip, but expensive. I'd much rather >handle the OBDII communications myself, but I don't have the $$$ to buy the >documentation. The Elm part itself is a $2 PIC, so it can't be that difficult. > >-- Sean > >At 04:37 PM 1/6/2006, you wrote: > > >>>Do you know anything about J1850 (OBDII)? >>> >>> >>What do you need to know? I've done keyword protocol. >> >>Randy >>www.newmicros.com >> >> > > > > >Yahoo! Groups Links > > > > > > > > > > > > >
Re: [lpc2000] Re: J1939 stacks for the LPC2xxx's?
2006-01-07 by Onestone
Odd comment. I doubt that they consider their code to be Random. Other Microchip implementations have been reliably functional, if not always awe inspiring. Their USB, TCP/IP stuff etc is solidly boring. I would rather trust this than some $18k package that may very well have been brewed up by a hobbyist. just because it's a commercial offering doesn't mean it's reliable, I mean look at windows, the PSP, etc etc. Al Joel Winarske wrote:
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>Hi Andr\ufffd, > > > >>>I am working on my little hobby project to fool a trucks' speed limiter >>> >>> >>and I would really appreciate it if anybody could give some help to start >>up with a LPC2129. I do have pretty much knowledge of SAE J1939, but my >>knowledge about embedded programming is not (yet) enough. >> >> > >I designed a suite of RV-C based products. RV-C is a thin layer on top of >J1939. I evaluated the LPC2129 but required J1939 support would not fit. >You can fit a much stripped version of J1939 on the LPC2129. > >The commercial offerings for J1939 stacks run from $5kUS to $18kUS+. >Quality varies widely. Microchip has a J1939 implementation (cough...hack) >for zero cost. I would avoid this unless implementing a proprietary closed >loop system that doesn't involve life safety. I would never trust my life >on random free code. > >Regards, >Joel Winarske > >------------------------------------ >Independent Electronics, Inc. >Joel Winarske >Systems Architect >joelw@... >2248 Morlan Drive >Napa, CA 94558 >tel: (707) 320-4271 >fax: (408) 516-5978 >Timezone: GMT -08:00 >------------------------------------ > > > > > >Yahoo! Groups Links > > > > > > > > > > > > >
RE: [lpc2000] Re: J1939 stacks for the LPC2xxx's?
2006-01-07 by Joel Winarske
> Odd comment. I doubt that they consider their code to be Random. Other > Microchip implementations have been reliably functional, if not always > awe inspiring. Their USB, TCP/IP stuff etc is solidly boring. I would > rather trust this than some $18k package that may very well have been > brewed up by a hobbyist. just because it's a commercial offering doesn't > mean it's reliable, I mean look at windows, the PSP, etc etc. Not odd at all. It's a hack in light of requiring a J1939 compliant device. Perhaps more a marketing push to show they have something for the Automotive sector. The Microchip CANopen stack is better. The ~18k package is from CAN-Vector. http://www.vector-cantech.com/ In the automotive sector they are the leader at what they do. The majority of other vendors are integrators who are selling their not-so refined or tested code base from past projects. Joel