CCS C Software and Maintenance Offers
FAQFAQ   FAQForum Help   FAQOfficial CCS Support   SearchSearch  RegisterRegister 

ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

CCS does not monitor this forum on a regular basis.

Please do not post bug reports on this forum. Send them to support@ccsinfo.com

Reliabilty difrence between JW and 04/SM 12C672

 
Post new topic   Reply to topic    CCS Forum Index -> General CCS C Discussion
View previous topic :: View next topic  
Author Message
Wessel
Guest







Reliabilty difrence between JW and 04/SM 12C672
PostPosted: Thu Jun 12, 2003 2:18 am     Reply with quote

<font face="Courier New" size=-1>The Problem is that the development pic 12C672 JW works 100\% while the 12C672 04/SM has a 1.4\% to 6.2\% error. The error is when the PIC receives the string that triggers the process nothing happens no data is being sent out. I tested serveral 04/SM Pics and the result is the same on all.

There is three devices connected on the pic two devices is communicating at 9600 BAUD and the third is comunicating at 4800 Buad this device is continiusly suplying data. The trigger device is cominicating on 9600 Baud.

ANY IDEAS
or
SULUTIONS? </font>
___________________________
This message was ported from CCS's old forum
Original Post ID: 144515169
Tomi
Guest







Re: Reliabilty difrence between JW and 04/SM 12C672
PostPosted: Thu Jun 12, 2003 4:20 am     Reply with quote

Do you use the PIC's internal 4MHz oscillator?
If so then keep in mind that the OSCCAL register handling strategy is different. When using the JW device you have to read out and save the oscillator calibration data because it is cleared under the UV lamp.
When using OTP version leave the calibration data untouched (it is factory pre-programmed).

:=<font face="Courier New" size=-1>The Problem is that the development pic 12C672 JW works 100\% while the 12C672 04/SM has a 1.4\% to 6.2\% error. The error is when the PIC receives the string that triggers the process nothing happens no data is being sent out. I tested serveral 04/SM Pics and the result is the same on all.
:=
:=There is three devices connected on the pic two devices is communicating at 9600 BAUD and the third is comunicating at 4800 Buad this device is continiusly suplying data. The trigger device is cominicating on 9600 Baud.
:=
:=ANY IDEAS
:=or
:=SULUTIONS? </font>
___________________________
This message was ported from CCS's old forum
Original Post ID: 144515171
Wessel
Guest







Re: Reliabilty difrence between JW and 04/SM 12C672
PostPosted: Thu Jun 12, 2003 4:56 am     Reply with quote

Yes the internal oscillator is used and the oscal register is loaded.

The problem is with the OTP Device 12C672 04/SM.
I programmed one with the clk out(osc 2) enabled and the output frequency is within the 1MHz range.

:=Do you use the PIC's internal 4MHz oscillator?
:=If so then keep in mind that the OSCCAL register handling strategy is different. When using the JW device you have to read out and save the oscillator calibration data because it is cleared under the UV lamp.
:=When using OTP version leave the calibration data untouched (it is factory pre-programmed).
:=
:=:=<font face="Courier New" size=-1>The Problem is that the development pic 12C672 JW works 100\% while the 12C672 04/SM has a 1.4\% to 6.2\% error. The error is when the PIC receives the string that triggers the process nothing happens no data is being sent out. I tested serveral 04/SM Pics and the result is the same on all.
:=:=
:=:=There is three devices connected on the pic two devices is communicating at 9600 BAUD and the third is comunicating at 4800 Buad this device is continiusly suplying data. The trigger device is cominicating on 9600 Baud.
:=:=
:=:=ANY IDEAS
:=:=or
:=:=SULUTIONS? </font>
___________________________
This message was ported from CCS's old forum
Original Post ID: 144515173
Wessel
Guest







Re: Reliabilty difrence between JW and 04/SM 12C672
PostPosted: Thu Jun 12, 2003 4:58 am     Reply with quote

Yes the internal oscillator is used and the oscal register is loaded.

The problem is with the OTP Device 12C672 04/SM.
I programmed one with the clk out(osc 2) enabled and the output frequency is within the 1MHz range. Theoretically if the program works without errors on the JW it should also do so in the 04/SM :( .

:=Do you use the PIC's internal 4MHz oscillator?
:=If so then keep in mind that the OSCCAL register handling strategy is different. When using the JW device you have to read out and save the oscillator calibration data because it is cleared under the UV lamp.
:=When using OTP version leave the calibration data untouched (it is factory pre-programmed).
:=
:=:=<font face="Courier New" size=-1>The Problem is that the development pic 12C672 JW works 100\% while the 12C672 04/SM has a 1.4\% to 6.2\% error. The error is when the PIC receives the string that triggers the process nothing happens no data is being sent out. I tested serveral 04/SM Pics and the result is the same on all.
:=:=
:=:=There is three devices connected on the pic two devices is communicating at 9600 BAUD and the third is comunicating at 4800 Buad this device is continiusly suplying data. The trigger device is cominicating on 9600 Baud.
:=:=
:=:=ANY IDEAS
:=:=or
:=:=SULUTIONS? </font>
___________________________
This message was ported from CCS's old forum
Original Post ID: 144515174
Tomi
Guest







Re: Reliabilty difrence between JW and 04/SM 12C672
PostPosted: Thu Jun 12, 2003 5:05 am     Reply with quote

<font face="Courier New" size=-1>Accuracy? Keep in mind that you have to have max. 1.5\% error to get a reliable serial communication.

:=I programmed one with the clk out(osc 2) enabled and the output frequency is within the 1MHz range.</font>
___________________________
This message was ported from CCS's old forum
Original Post ID: 144515175
Wessel
Guest







Re: Reliabilty difrence between JW and 04/SM 12C672
PostPosted: Thu Jun 12, 2003 5:34 am     Reply with quote

Do you mean that the frequancy should be within that error range:? The maximum error on the frequancy is less than 1.5\%

:=<font face="Courier New" size=-1>Accuracy? Keep in mind that you have to have max. 1.5\% error to get a reliable serial communication.
___________________________
This message was ported from CCS's old forum
Original Post ID: 144515177
Sherpa Doug
Guest







Re: Reliabilty difrence between JW and 04/SM 12C672
PostPosted: Thu Jun 12, 2003 7:31 am     Reply with quote

:=<font face="Courier New" size=-1>The Problem is that the development pic 12C672 JW works 100\% while the 12C672 04/SM has a 1.4\% to 6.2\% error. The error is when the PIC receives the string that triggers the process nothing happens no data is being sent out. I tested serveral 04/SM Pics and the result is the same on all.
:=
:=There is three devices connected on the pic two devices is communicating at 9600 BAUD and the third is comunicating at 4800 Buad this device is continiusly suplying data. The trigger device is cominicating on 9600 Baud.
:=
:=ANY IDEAS
:=or
:=SULUTIONS? </font>

I don't understand the problem. When you say 1.4 to 6.2\% error do you mean the baud rate is off by that much? Do you mean a calculated value is off by that much? Do you mean that often an incomming command is missed? Do you meant that often you fail to get any outgoing message? or is the outgoing message garbled?

I'd like to help if I understood the problem.
___________________________
This message was ported from CCS's old forum
Original Post ID: 144515178
Wessel
Guest







Re: Reliabilty difrence between JW and 04/SM 12C672
PostPosted: Thu Jun 12, 2003 7:54 am     Reply with quote

I mean out of 465 triggers 13 didn't respond. Basicly the pic didn't send out any information(outgoing message),no response would be correct. Please ask if there needs to be more clarifying to be done.

Thank you

:=I don't understand the problem. When you say 1.4 to 6.2\% error do you mean the baud rate is off by that much? Do you mean a calculated value is off by that much? Do you mean that often an incomming command is missed? Do you meant that often you fail to get any outgoing message? or is the outgoing message garbled?
:=
:=I'd like to help if I understood the problem.
___________________________
This message was ported from CCS's old forum
Original Post ID: 144515179
Sherpa Doug
Guest







Re: Reliabilty difrence between JW and 04/SM 12C672
PostPosted: Thu Jun 12, 2003 8:37 am     Reply with quote

Ah! the fog clears...
You checked the baud rate and it is within tollerance. Are you using a software or hardware UART? Also are you initializing your variables and input buffer. I know with the 16C5x chips the windowed parts tend to have RAM zeroed by ambient light. When you switch to a non-windowed part nasty initialization bugs can appear.

:=I mean out of 465 triggers 13 didn't respond. Basicly the pic didn't send out any information(outgoing message),no response would be correct. Please ask if there needs to be more clarifying to be done.
:=
:=Thank you
:=
:=:=I don't understand the problem. When you say 1.4 to 6.2\% error do you mean the baud rate is off by that much? Do you mean a calculated value is off by that much? Do you mean that often an incomming command is missed? Do you meant that often you fail to get any outgoing message? or is the outgoing message garbled?
:=:=
:=:=I'd like to help if I understood the problem.

___________________________
This message was ported from CCS's old forum
Original Post ID: 144515180
Wessel
Guest







Re: Reliabilty difrence between JW and 04/SM 12C672
PostPosted: Thu Jun 12, 2003 8:52 am     Reply with quote

A software UART the 12C672 doesn't have a hardware UART. The BAUD rate is within the tolerances. could these initialization bugs cause a problem where the PIC works well for minute or longer and the give a Problem :?

I think I should block the window and try the test again. and see if the problems appear on the UV PIC.

:=Ah! the fog clears...
:=You checked the baud rate and it is within tollerance. Are you using a software or hardware UART? Also are you initializing your variables and input buffer. I know with the 16C5x chips the windowed parts tend to have RAM zeroed by ambient light. When you switch to a non-windowed part nasty initialization bugs can appear.

___________________________
This message was ported from CCS's old forum
Original Post ID: 144515181
Sherpa Doug
Guest







Re: Reliabilty difrence between JW and 04/SM 12C672
PostPosted: Thu Jun 12, 2003 9:30 am     Reply with quote

:=A software UART the 12C672 doesn't have a hardware UART. The BAUD rate is within the tolerances. could these initialization bugs cause a problem where the PIC works well for minute or longer and the give a Problem :?

Might you have a circular comms input buffer that takes a while to fill and wrap around. The problem may only occur when the buffer wraps.

:=I think I should block the window and try the test again. and see if the problems appear on the UV PIC.
:=
:=:=Ah! the fog clears...
:=:=You checked the baud rate and it is within tollerance. Are you using a software or hardware UART? Also are you initializing your variables and input buffer. I know with the 16C5x chips the windowed parts tend to have RAM zeroed by ambient light. When you switch to a non-windowed part nasty initialization bugs can appear.
:=
___________________________
This message was ported from CCS's old forum
Original Post ID: 144515183
Wessel
Guest







Re: Reliabilty difrence between JW and 04/SM 12C672
PostPosted: Tue Jun 17, 2003 1:34 am     Reply with quote

No A Linear Buffer is used.

:=Might you have a circular comms input buffer that takes a while to fill and wrap around. The problem may only occur when the buffer wraps.
___________________________
This message was ported from CCS's old forum
Original Post ID: 144515314
Display posts from previous:   
Post new topic   Reply to topic    CCS Forum Index -> General CCS C Discussion All times are GMT - 6 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group