Post by thread:Code runs perfect in MPLAB but won't run in PIC !

Does this sound right? I have put together a little program that counts from 0 to 9999, it sends out 4 bytes via 9600 RS232 each time it increments. Most of the routines have been used in other programs and worked flawlessly in them. I have moved the sub-routines around thinking that maybe it didn't like the order but nothing. It does the first digit. I.E. it outputs a 0 then stops with the pin high. Running it in the MPLAB simulator it works great. Any suggestions ? Thanks in advance ! James Holbrook

James & Ili wrote: > > Does this sound right? I have put together a little program that > counts from 0 to 9999, it sends out 4 bytes via 9600 RS232 each time > it increments. Most of the routines have been used in other programs > and worked flawlessly in them. I have moved the sub-routines around > thinking that maybe it didn't like the order but nothing. It does the > first digit. I.E. it outputs a 0 then stops with the pin high. > Running it in the MPLAB simulator it works great. Any suggestions ? > Thanks in advance ! > James Holbrook When this happens to me, it is usually an initialisation problem. On the simulator, the RAM, etc.., is initialised repeatably from the start of simulation. On a real chip, the RAM will usually power up at 0FFh on the OTP chips, but not always, and on the -JW windowed dev. chips, it tends to come up a 000h, unless you are in total darkness! This is due to the effect of light coming through the EPROM window, (even with paper label) and dis- -charging the RAM cells during power-up. A little light does not SEEM to cause misoperation, however. jim ford

James, which PIC are you using? Was the previous code running on another member of the PIC family? There are a lot of possibilities here including a simple mistake in moving your routines from other programs. You mentioned "Most of the routines" so your new routines may be in error. Moving the subroutines around would only be a problem if you crossed a code page boundry. For 16C5x and 12C5x devices that boundry is 256 Bytes. For 16C6/7/8/9x and 12C6x devices it's 2048 Bytes. If this is the case, you need to manipulate the PAx Bits in the STATUS register for the 16/12C5x or PCLATH for the other devices. - Tom At 02:19 PM 3/10/98 -0600, you wrote: {Quote hidden}>Does this sound right? I have put together a little program that >counts from 0 to 9999, it sends out 4 bytes via 9600 RS232 each time >it increments. Most of the routines have been used in other programs >and worked flawlessly in them. I have moved the sub-routines around >thinking that maybe it didn't like the order but nothing. It does the >first digit. I.E. it outputs a 0 then stops with the pin high. >Running it in the MPLAB simulator it works great. Any suggestions ? > Thanks in advance ! >James Holbrook > >