Lpc2000

Dear all,

I am using two LPC2129 boards having 12 MHz clock, with CCLK and PCLK 
set to 60 MHz. They are connected via a CAN link. I am trying to set 
the bus timing register C1BTR to run the CAN at the baudrate of 1 
Mbit/s. The value I tried is :

   C1BTR = 0x34C005;

But it did not work. 

Anybody can help me to work out the correct setting of this register 
to let the CAN go for 1 Mbaud.

Thanks very much.

Mouaaz

PS. the correct setting for 125 kbaud was: C1BTR = 0x001C001D;

Dear all,

I am using two LPC2129 boards having 12 MHz clock, with CCLK and PCLK
set to 60 MHz. They are connected via a CAN link. I am trying to set
the bus timing register C1BTR to run the CAN at the baudrate of 1
Mbit/s. The value I tried is :

C1BTR = 0x34C005;

But it did not work.

Anybody can help me to work out the correct setting of this register
to let the CAN go for 1 Mbaud.

Thanks very much.

Mouaaz

PS. the correct setting for 125 kbaud was: C1BTR = 0x001C001D;

I've tried making a spreadsheet for this, but I haven't had a chance
to actually test the timings.  But here are the answers I come up
with.  These calculations are for SAM = 1 only.

Solution Set #1:
BRP = 15
SJW = 4
TSeg2 = 4-6
TSeg1 = 10-8
TSeg1 + Tseg2 should be 14

So the values for this set should be 
0x0057C00F (Tseg1 = 8)
0x0048C00F (Tseg1 = 9)
0x0039C00F (Tseg1 = 10)

Solution Set #2:
BRP = 10
SJW = 3-4
Tseg2 = 3-4
Tseg1 = 6-5
Tseg1 + Tseg2 = 9
0x0025800A (SJW = 3, Tseg2=3, Tseg1 = 6)
You can probably figure the rest of them out.

Solution Set #3
BRP = 6
SJW = 2-4
Tseg2 = 2
Tseg1 = 3

Please let me know if any of these work.  If my spreadsheet works,
then I might post it, but I won't get a chance to test any of this
works for a couple of weeks.

Assumptions made, deltaF = 1%, bus length = 10 meters max, propagation
time = 6.5m/ns, logic delay and loop delay = 200ns

--Peter




--- In lpc2000@yahoogroups.com, "mouaaz" <mouaaz@y...> wrote:

> 
> Dear all,
> 
> I am using two LPC2129 boards having 12 MHz clock, with CCLK and PCLK 
> set to 60 MHz. They are connected via a CAN link. I am trying to set 
> the bus timing register C1BTR to run the CAN at the baudrate of 1 
> Mbit/s. The value I tried is :
> 
>    C1BTR = 0x34C005;
> 
> But it did not work. 
> 
> Anybody can help me to work out the correct setting of this register 
> to let the CAN go for 1 Mbaud.
> 
> Thanks very much.
> 
> Mouaaz
> 
> PS. the correct setting for 125 kbaud was: C1BTR = 0x001C001D;

Hi Mouaaz,

the Rules of Bit Timing Parameters are not described in the Philips 
LPC2000 User Manuals. And they are not easy. Please refer to the 
Bosch Homepage for more Information.
But, I give you an Example that works very well in my application:

Assumed that you setup the PLL and the cclk = 60 MHz and the VPB 
Divider = 4 (after RESET) and the pclk = 15 MHz, you can use the 
following parameters for a first test:

// Common CAN bit rates for cclk=60 MHz, VPBDIV=4: ==> pclk=15 MHz:
// CAN Bit Timings in Detail -->   // SAM TSEG1 TSEG2 SJW SP%  BRP
#define CANBit10k_15MHz   0x25C095 // 0+1  5+1   2+1  3+1 70  149+1
#define CANBit25k_15MHz   0x25C03B // 0+1  5+1   2+1  3+1 70   59+1
#define CANBit50k_15MHz   0x25C01D // 0+1  5+1   2+1  3+1 70   29+1
#define CANBit100k_15MHz  0x25C00E // 0+1  5+1   2+1  3+1 70   14+1
#define CANBit125k_15MHz  0x25C00B // 0+1  5+1   2+1  3+1 70   11+1
#define CANBit250k_15MHz  0x25C005 // 0+1  5+1   2+1  3+1 70    5+1
#define CANBit500k_15MHz  0x25C002 // 0+1  5+1   2+1  3+1 70    2+1
#define CANBit1000k_15MHz 0x48C000 // 0+1  8+1   4+1  3+1 67    0+1

The following parameters for VPBDIV = 1 I have calculated on this 
base:

For cclk = 60 MHz and VPBDIV = 1, the following parameters should 
work:

// Common CAN bit rates for cclk=60 MHz, VPBDIV=1: ==> pclk=60 MHz:
// CAN Bit Timings in Detail -->   // SAM TSEG1 TSEG2 SJW SP%  BRP
#define CANBit10k_60MHz   0x25C257 // 0+1  5+1   2+1  3+1 70  599+1
#define CANBit25k_60MHz   0x25C0EF // 0+1  5+1   2+1  3+1 70  239+1
#define CANBit50k_60MHz   0x25C077 // 0+1  5+1   2+1  3+1 70  119+1
#define CANBit100k_60MHz  0x25C03B // 0+1  5+1   2+1  3+1 70   59+1
#define CANBit125k_60MHz  0x25C02F // 0+1  5+1   2+1  3+1 70   47+1
#define CANBit250k_60MHz  0x25C017 // 0+1  5+1   2+1  3+1 70   23+1
#define CANBit500k_60MHz  0x25C00B // 0+1  5+1   2+1  3+1 70   11+1
#define CANBit1000k_60MHz 0x48C003 // 0+1  8+1   4+1  3+1 67    3+1

Write this Values to the CANBTR Register.

The defined CAN Bit Rates works very well in my application (Keil 
MCB2100 connected to a CAN Analyzer (CANalyzer from vector 
informatik)).

The right Bit Rate Calculation is:

Bit rate = cclk / ( VPBDIV * BRP * ( TSEG1+1 + 1 + TSEG2+1))

The Sample Point should be in the Range 50% to 90 %.

Please download the Keil Examples for a CAN Driver, that was very 
helpful for me:

http://www.keil.com/download/docs/lpc2_can_examples.zip.asp

Greetings from Dietmar.

http://www.weiss-electronic.de

-----------------------------------------------------------------

--- In lpc2000@yahoogroups.com, "mouaaz" <mouaaz@y...> wrote:
> 
> Dear all,
> 
> I am using two LPC2129 boards having 12 MHz clock, with CCLK and 
PCLK

> set to 60 MHz. They are connected via a CAN link. I am trying to set
> the bus timing register C1BTR to run the CAN at the baudrate of 1
> Mbit/s. The value I tried is :
> 
> C1BTR = 0x34C005;
> 
> But it did not work.
> 
> Anybody can help me to work out the correct setting of this register
> to let the CAN go for 1 Mbaud.
> 
> Thanks very much.
> 
> Mouaaz
> 
> PS. the correct setting for 125 kbaud was: C1BTR = 0x001C001D;

Dear all:

      I use LPC2292’s CAN , But I can’t use it’s filter properly.

      2292 has two cans, I let can1 send data to can2. If I disable the
filter,the data is properly received, But if I enable the filter, I see that
the CANRFS,CANRID,CANRDA and CANRDB has received the data properly, but the
RBS bit is not set to ‘1’. I set the filter ram as the datasheet say, and
I have set the SFF_sa,SFF_GRP_sa,EFF_sa,EFF_GRP_sa and EndOfTable, I have
set AFMR to 0x00 and filled the unused ram to 0xf7fff7ff. I don’t know way.
Is there anyother thing I should do? 

      Thanks very much.

wangjie








Yahoo! Groups Sponsor



ADVERTISEMENT
 
<http://us.ard.yahoo.com/SIG=129m78jah/M=298184.6018725.7038619.3001176/D=gr
oups/S=1706554205:HM/EXP=1110147452/A=2593423/R=0/SIG=11el9gslf/*http:/www.n
etflix.com/Default?mqso=60190075> click here


 
<http://us.adserver.yahoo.com/l?M=298184.6018725.7038619.3001176/D=groups/S=
:HM/A=2593423/rand=781346541> 

 

  _____  

Yahoo! Groups Links

*	To visit your group on the web, go to:
http://groups.yahoo.com/group/lpc2000/
  
*	To unsubscribe from this group, send an email to:
lpc2000-unsubscribe@yahoogroups.com <mailto:lpc2000-unsubscribe@yahoogroups.
com?subject=Unsubscribe> 
  
*	Your use of Yahoo! Groups is subject to the Yahoo!
<http://docs.yahoo.com/info/terms/>  Terms of Service. 



[Non-text portions of this message have been removed]

See post below for full text I'm replying to...

From: dietmar_wengler [mailto:dietmar_wengler@...] 
Sent: Saturday, March 05, 2005 4:17 PM
To: lpc2000@yahoogroups.com
Subject: [lpc2000] Re: CAN baudrate setting

> Please download the Keil Examples for a CAN Driver, that was
> very helpful for me:
> http://www.keil.com/download/docs/lpc2_can_examples.zip.asp

I have the files from the Keil link above, but it does not match/jive with
what you have posted.

The CANALL source code has the following define:

// Common CAN bit rates
#define   CANBitrate125k_12MHz   0x001C001D
#define   CANBitrate250k_12MHz   0x001C000E

I've ran CANALL on my LPC2194 design and on Keil's MCB2100 and the above
numbers work fine.  Both boards have a 12Mhz crystal, 60Mhz internal
clock, VPDIV=1;

You say:

#define CANBit125k_60MHz  0x25C02F // 0+1  5+1   2+1  3+1 70   47+1
#define CANBit250k_60MHz  0x25C017 // 0+1  5+1   2+1  3+1 70   23+1

Those are WAY off from what I know to work.
Am I missing something?

Greg Deuerling
Fermi National Accelerator Laboratory
Feynman Computing Center, Room 370, MS 368
P.O.Box 500 Batavia, IL 60510
(630)840-4629     FAX  (630)840-5406
Electronic Systems Engineering Group
Work: egads@...
Personal: gdeuerling@...

  
________________________________________
From: dietmar_wengler [mailto:dietmar_wengler@...] 
Sent: Saturday, March 05, 2005 4:17 PM
To: lpc2000@yahoogroups.com
Subject: [lpc2000] Re: CAN baudrate setting


Hi Mouaaz,

the Rules of Bit Timing Parameters are not described in the Philips 
LPC2000 User Manuals. And they are not easy. Please refer to the 
Bosch Homepage for more Information.
But, I give you an Example that works very well in my application:

Assumed that you setup the PLL and the cclk = 60 MHz and the VPB 
Divider = 4 (after RESET) and the pclk = 15 MHz, you can use the 
following parameters for a first test:

// Common CAN bit rates for cclk=60 MHz, VPBDIV=4: ==> pclk=15 MHz:
// CAN Bit Timings in Detail -->   // SAM TSEG1 TSEG2 SJW SP%  BRP
#define CANBit10k_15MHz   0x25C095 // 0+1  5+1   2+1  3+1 70  149+1
#define CANBit25k_15MHz   0x25C03B // 0+1  5+1   2+1  3+1 70   59+1
#define CANBit50k_15MHz   0x25C01D // 0+1  5+1   2+1  3+1 70   29+1
#define CANBit100k_15MHz  0x25C00E // 0+1  5+1   2+1  3+1 70   14+1
#define CANBit125k_15MHz  0x25C00B // 0+1  5+1   2+1  3+1 70   11+1
#define CANBit250k_15MHz  0x25C005 // 0+1  5+1   2+1  3+1 70    5+1
#define CANBit500k_15MHz  0x25C002 // 0+1  5+1   2+1  3+1 70    2+1
#define CANBit1000k_15MHz 0x48C000 // 0+1  8+1   4+1  3+1 67    0+1

The following parameters for VPBDIV = 1 I have calculated on this 
base:

For cclk = 60 MHz and VPBDIV = 1, the following parameters should 
work:

// Common CAN bit rates for cclk=60 MHz, VPBDIV=1: ==> pclk=60 MHz:
// CAN Bit Timings in Detail -->   // SAM TSEG1 TSEG2 SJW SP%  BRP
#define CANBit10k_60MHz   0x25C257 // 0+1  5+1   2+1  3+1 70  599+1
#define CANBit25k_60MHz   0x25C0EF // 0+1  5+1   2+1  3+1 70  239+1
#define CANBit50k_60MHz   0x25C077 // 0+1  5+1   2+1  3+1 70  119+1
#define CANBit100k_60MHz  0x25C03B // 0+1  5+1   2+1  3+1 70   59+1
#define CANBit125k_60MHz  0x25C02F // 0+1  5+1   2+1  3+1 70   47+1
#define CANBit250k_60MHz  0x25C017 // 0+1  5+1   2+1  3+1 70   23+1
#define CANBit500k_60MHz  0x25C00B // 0+1  5+1   2+1  3+1 70   11+1
#define CANBit1000k_60MHz 0x48C003 // 0+1  8+1   4+1  3+1 67    3+1

Write this Values to the CANBTR Register.

The defined CAN Bit Rates works very well in my application (Keil 
MCB2100 connected to a CAN Analyzer (CANalyzer from vector 
informatik)).

The right Bit Rate Calculation is:

Bit rate = cclk / ( VPBDIV * BRP * ( TSEG1+1 + 1 + TSEG2+1))

The Sample Point should be in the Range 50% to 90 %.

Please download the Keil Examples for a CAN Driver, that was very 
helpful for me:

http://www.keil.com/download/docs/lpc2_can_examples.zip.asp

Greetings from Dietmar.

http://www.weiss-electronic.de

-----------------------------------------------------------------

--- In lpc2000@yahoogroups.com, "mouaaz" <mouaaz@y...> wrote:
> 
> Dear all,
> 
> I am using two LPC2129 boards having 12 MHz clock, with CCLK and 
PCLK
> set to 60 MHz. They are connected via a CAN link. I am trying to set
> the bus timing register C1BTR to run the CAN at the baudrate of 1
> Mbit/s. The value I tried is :
> 
> C1BTR = 0x34C005;
> 
> But it did not work.
> 
> Anybody can help me to work out the correct setting of this register
> to let the CAN go for 1 Mbaud.
> 
> Thanks very much.
> 
> Mouaaz
> 
> PS. the correct setting for 125 kbaud was: C1BTR = 0x001C001D;





Yahoo! Groups Sponsor
ADVERTISEMENT




________________________________________
Yahoo! Groups Links
• To visit your group on the web, go to:
http://groups.yahoo.com/group/lpc2000/
  
• To unsubscribe from this group, send an email to:
lpc2000-unsubscribe@yahoogroups.com
  
• Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.

The Keil examples do indeed work right.  The following:
#define CANBit125k_60MHz 0x25C02F // 0+1 5+1 2+1 3+1 70 47+1
also works right.  He has changed the sampling intervals which is 
why it looks so "wrong".  His comment with all those magic numbers 
is a note about it.
James



--- In lpc2000@yahoogroups.com, Greg Deuerling <egads@f...> wrote:
> 
> See post below for full text I'm replying to...
> 
> From: dietmar_wengler [mailto:dietmar_wengler@y...] 
> Sent: Saturday, March 05, 2005 4:17 PM
> To: lpc2000@yahoogroups.com
> Subject: [lpc2000] Re: CAN baudrate setting
> 
> > Please download the Keil Examples for a CAN Driver, that was
> > very helpful for me:
> > http://www.keil.com/download/docs/lpc2_can_examples.zip.asp
> 
> I have the files from the Keil link above, but it does not 
match/jive with
> what you have posted.
> 
> The CANALL source code has the following define:
> 
> // Common CAN bit rates
> #define   CANBitrate125k_12MHz   0x001C001D
> #define   CANBitrate250k_12MHz   0x001C000E
> 
> I've ran CANALL on my LPC2194 design and on Keil's MCB2100 and the 
above
> numbers work fine.  Both boards have a 12Mhz crystal, 60Mhz 
internal
> clock, VPDIV=1;
> 
> You say:
> 
> #define CANBit125k_60MHz  0x25C02F // 0+1  5+1   2+1  3+1 70   47+1
> #define CANBit250k_60MHz  0x25C017 // 0+1  5+1   2+1  3+1 70   23+1
> 
> Those are WAY off from what I know to work.
> Am I missing something?
> 
> Greg Deuerling
> Fermi National Accelerator Laboratory
> Feynman Computing Center, Room 370, MS 368
> P.O.Box 500 Batavia, IL 60510
> (630)840-4629     FAX  (630)840-5406
> Electronic Systems Engineering Group
> Work: egads@f...
> Personal: gdeuerling@c...
> 
>   
> ________________________________________
> From: dietmar_wengler [mailto:dietmar_wengler@y...] 
> Sent: Saturday, March 05, 2005 4:17 PM
> To: lpc2000@yahoogroups.com
> Subject: [lpc2000] Re: CAN baudrate setting
> 
> 
> Hi Mouaaz,
> 
> the Rules of Bit Timing Parameters are not described in the 
Philips 
> LPC2000 User Manuals. And they are not easy. Please refer to the 
> Bosch Homepage for more Information.
> But, I give you an Example that works very well in my application:
> 
> Assumed that you setup the PLL and the cclk = 60 MHz and the VPB 
> Divider = 4 (after RESET) and the pclk = 15 MHz, you can use the 
> following parameters for a first test:
> 
> // Common CAN bit rates for cclk=60 MHz, VPBDIV=4: ==> pclk=15 MHz:
> // CAN Bit Timings in Detail -->   // SAM TSEG1 TSEG2 SJW SP%  BRP
> #define CANBit10k_15MHz   0x25C095 // 0+1  5+1   2+1  3+1 70  149+1
> #define CANBit25k_15MHz   0x25C03B // 0+1  5+1   2+1  3+1 70   59+1
> #define CANBit50k_15MHz   0x25C01D // 0+1  5+1   2+1  3+1 70   29+1
> #define CANBit100k_15MHz  0x25C00E // 0+1  5+1   2+1  3+1 70   14+1
> #define CANBit125k_15MHz  0x25C00B // 0+1  5+1   2+1  3+1 70   11+1
> #define CANBit250k_15MHz  0x25C005 // 0+1  5+1   2+1  3+1 70    5+1
> #define CANBit500k_15MHz  0x25C002 // 0+1  5+1   2+1  3+1 70    2+1
> #define CANBit1000k_15MHz 0x48C000 // 0+1  8+1   4+1  3+1 67    0+1
> 
> The following parameters for VPBDIV = 1 I have calculated on this 
> base:
> 
> For cclk = 60 MHz and VPBDIV = 1, the following parameters should 
> work:
> 
> // Common CAN bit rates for cclk=60 MHz, VPBDIV=1: ==> pclk=60 MHz:
> // CAN Bit Timings in Detail -->   // SAM TSEG1 TSEG2 SJW SP%  BRP
> #define CANBit10k_60MHz   0x25C257 // 0+1  5+1   2+1  3+1 70  599+1
> #define CANBit25k_60MHz   0x25C0EF // 0+1  5+1   2+1  3+1 70  239+1
> #define CANBit50k_60MHz   0x25C077 // 0+1  5+1   2+1  3+1 70  119+1
> #define CANBit100k_60MHz  0x25C03B // 0+1  5+1   2+1  3+1 70   59+1
> #define CANBit125k_60MHz  0x25C02F // 0+1  5+1   2+1  3+1 70   47+1
> #define CANBit250k_60MHz  0x25C017 // 0+1  5+1   2+1  3+1 70   23+1
> #define CANBit500k_60MHz  0x25C00B // 0+1  5+1   2+1  3+1 70   11+1
> #define CANBit1000k_60MHz 0x48C003 // 0+1  8+1   4+1  3+1 67    3+1
> 
> Write this Values to the CANBTR Register.
> 
> The defined CAN Bit Rates works very well in my application (Keil 
> MCB2100 connected to a CAN Analyzer (CANalyzer from vector 
> informatik)).
> 
> The right Bit Rate Calculation is:
> 
> Bit rate = cclk / ( VPBDIV * BRP * ( TSEG1+1 + 1 + TSEG2+1))
> 
> The Sample Point should be in the Range 50% to 90 %.
> 
> Please download the Keil Examples for a CAN Driver, that was very 
> helpful for me:
> 
> http://www.keil.com/download/docs/lpc2_can_examples.zip.asp
> 
> Greetings from Dietmar.
> 
> http://www.weiss-electronic.de
> 
> -----------------------------------------------------------------
> 
> --- In lpc2000@yahoogroups.com, "mouaaz" <mouaaz@y...> wrote:
> > 
> > Dear all,
> > 
> > I am using two LPC2129 boards having 12 MHz clock, with CCLK and 
> PCLK
> > set to 60 MHz. They are connected via a CAN link. I am trying to 
set
> > the bus timing register C1BTR to run the CAN at the baudrate of 1
> > Mbit/s. The value I tried is :
> > 
> > C1BTR = 0x34C005;
> > 
> > But it did not work.
> > 
> > Anybody can help me to work out the correct setting of this 
register
> > to let the CAN go for 1 Mbaud.
> > 
> > Thanks very much.
> > 
> > Mouaaz
> > 
> > PS. the correct setting for 125 kbaud was: C1BTR = 0x001C001D;
> 
> 
> 
> 
> 
> Yahoo! Groups Sponsor
> ADVERTISEMENT
> 
> 
> 
> 
> ________________________________________
> Yahoo! Groups Links
> • To visit your group on the web, go to:
> http://groups.yahoo.com/group/lpc2000/
>   
> • To unsubscribe from this group, send an email to:
> lpc2000-unsubscribe@yahoogroups.com
>   
> • Your use of Yahoo! Groups is subject to the Yahoo! Terms of 
Service.

Hello!

Are there any LPC23xx (USB and Ethernet) specs available?

Thanks,
Marko

Hi Mouaaz,

sorry, but there was a little error on my bitrate calculation:

instead of:
Bit rate = cclk / ( VPBDIV * BRP * ( TSEG1+1 + 1 + TSEG2+1))

it must be:
Bit rate = cclk / ( VPBDIV * (BRP+1) * ( TSEG1+1 + 1 + TSEG2+1))

Greetings from Dietmar.

Hi all

Does anyone have any news about the LPC23xx with 10/100 Ethernet?

People were talking about it a lot about one year ago (fair number of 
post then) but it has gone very quiet recently.

I heard that the new device may be available in Q2.2006 when I asked 
Philips at the Embedded World exhibition in Nurberg.

Has someone more details...?

Regards

Mark Butcher
www.mjbc.ch