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| Micro Controllers Discuss all aspects of micro controllers - building them, coding them, etc. All controllers are welcome - PIC, BASIC, Z8 Encore!, etc. |
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8th May 2008, 11:15 AM
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You are correct, I got the 9 and 5 the wrong way around. I'll edit it.
Mike. |
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8th May 2008, 12:39 PM
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New Member
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F -> C subtract 32, multiply by 5/9. C -> F multiply by 9/5, add 32. Of course, it's the student's responsibility to check, since it's their project and they will be getting the grade. I was adjunct faculty in a chemical engineering department for several years. The first lecture in the first chemical engineering course taught to sophomores was unit conversions. I really hated to teach the problem session that went with that lecture - an hour and a half of unit conversion problems. How dry! Anyway, it's a bit disheartening that a senior engineering student is asking for help on unit conversions. Just my two cents! |
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8th May 2008, 01:07 PM
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Experienced Member
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Bugger, you are right again. I was thinking the freezing point of water was -32°F. It's that long since I worked in such archaic units I got confused.
Mike. |
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9th May 2008, 05:13 AM
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New Member
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You guys are great, I have never been so greatful that my project, would bring so much conversation I am currently debugging this code right now if you want to see it. I am rather proud of it since I am an amature and I was told that May 9th would be tough to get it working by. It is is almost working.
Elizabeth |
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9th May 2008, 05:15 AM
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New Member
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my code went from like 130 lines to about 4 hundred with about 2 hours of work, using source code and testing. I think i am finally getting this stuff
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9th May 2008, 05:28 AM
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New Member
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Elizabeth |
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9th May 2008, 08:38 AM
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Experienced Member
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hi Elizabeth,
Ran your program in simulation. The Interrupt [ISR] needs to be corrected also the related Interrupt Enables. After the first ADC read, the program keeps looping in the Call CelConversion routines.? You are using TMR0 as an Intr. extract from microchip 16F877A template NOTE the ISR origin. ;************************************************* ********************* Code:
ORG 0x000 ; processor reset vector nop ; nop required for icd goto main ; go to beginning of program ORG 0x004 ; interrupt vector location movwf w_temp ; save off current W register contents movf STATUS,w ; move status register into W register movwf status_temp ; save off contents of STATUS register movf PCLATH,w ; move pclath register into w register movwf pclath_temp ; save off contents of PCLATH register ; isr code can go here or be located as a call subroutine elsewhere movf pclath_temp,w ; retrieve copy of PCLATH register movwf PCLATH ; restore pre-isr PCLATH register contents movf status_temp,w ; retrieve copy of STATUS register movwf STATUS ; restore pre-isr STATUS register contents swapf w_temp,f swapf w_temp,w ; restore pre-isr W register contents retfie ; return from interrupt main ; remaining code goes here Do you follow.? 
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Eric "Good enough is Perfect" PIC tutorials: Gramo's: www.digital-diy.net/ Bill's: www.blueroomelectronics.com/ Last edited by ericgibbs; 9th May 2008 at 08:41 AM. |
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