Post by thread:[PIC]: Running code without an ICD?!

Hello I am a new list member, so bear with me! I am trying to run code written in CCS's C compiler on a 16F876, using an ICD 1 and MPLAB. The code works fine when running in debug mode with the ICD connected (i.e. with the 'icd = true' and 'debug' options set) but when I try and run the code 'standalone' it does not work at all. As I know the code works, is there a reason why the PIC would not be running my code without the ICD connected? The MCLR line is not held in reset and the oscillator is running! I would really appreciate any advice! Thanks, Angus Thomson --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.525 / Virus Database: 322 - Release Date: 09/10/2003 -- http://www.piclist.com hint: To leave the PICList spam_OUTpiclist-unsubscribe-requestTakeThisOuTmitvma.mit.edu

* is /MCLR really at high logic level? * how is your BOD setting? And what's about supply voltage? (hint: under 4v AND BOD the device is kept in reset) * how do you know that osc is running? tested the output? Hope this helps. Ale On Sat, 8 Nov 2003, Angus Thomson wrote: {Quote hidden}> Hello > > I am a new list member, so bear with me! I am trying to run code written > in CCS's C compiler on a 16F876, using an ICD 1 and MPLAB. The code > works fine when running in debug mode with the ICD connected (i.e. with > the 'icd = true' and 'debug' options set) but when I try and run the > code 'standalone' it does not work at all. As I know the code works, is > there a reason why the PIC would not be running my code without the ICD > connected? The MCLR line is not held in reset and the oscillator is > running! I would really appreciate any advice! > > Thanks, > Angus Thomson > > > --- > Outgoing mail is certified Virus Free. > Checked by AVG anti-virus system (http://www.grisoft.com). > Version: 6.0.525 / Virus Database: 322 - Release Date: 09/10/2003 > > -- > http://www.piclist.com hint: To leave the PICList > .....piclist-unsubscribe-requestKILLspam@spam@mitvma.mit.edu > -- http://www.piclist.com hint: To leave the PICList piclist-unsubscribe-requestKILLspammitvma.mit.edu

Hello again, I have been debugging my circuit for over a day now, and still with no luck! Thanks to Ale for the suggestions, but unfortunately the PIC will still not run without the ICD attached and in debug mode. The strange thing is that it will run when debug mode is turned off, but only when the cable between the PIC and the ICD is only partially connected; when either taken out or plugged in fully, no code will run (the crystal is oscillating, MCLR is definitely high and BOD is switched off). I have tried a different PIC with the same result, and also have checked my circuit thoroughly. The ICD works fine with other circuits too, so this doesn’t seem to be the cause. Any ideas?! Thanks again! Angus Thomson {Original Message removed}

Angus Thomson wrote: > I have been debugging my circuit for over a day now, and still with no > luck! Thanks to Ale for the suggestions, but unfortunately the PIC will > still not run without the ICD attached and in debug mode. The strange > thing is that it will run when debug mode is turned off, but only when > the cable between the PIC and the ICD is only partially connected; when > either taken out or plugged in fully, no code will run (the crystal is > oscillating, MCLR is definitely high and BOD is switched off). I have > tried a different PIC with the same result, and also have checked my > circuit thoroughly. The ICD works fine with other circuits too, so this > doesn t seem to be the cause. This sounds like the low voltage programming pins are enabled but not tied low. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

>I do know PIC doesn't run when ICD is connected and the >debug option is off. It's probably because RB6 is kept >low by ICD during reseting. You do not need LVP mode when using the ICD1 as it generates the high voltage for you. I suspect it will control RB3 in case the PIC is set to LVP mode. However the original problem is that you must turn off the debug mode to have the PIC run without the ICD1 connected. If debug mode is on the internal code jumps to the debug code inside the PIC, and waits for a command from the ICD. As there is no ICD connected then you cannot get your code to run. I believe you should only need to change the configuration word to achieve this, without needing to re-program the whole chip, although this was what I was doing when using the ICD1. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

I know that when running in MPLAB, and programming the parts.....you have to disable the debugger if you want the code to run stand alone. Not being familiar with the CCS setup, its probably the same thing. _________________________________________________________________ Is your computer infected with a virus? Find out with a FREE computer virus scan from McAfee. Take the FreeScan now! http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963 -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.