Delay_ms not stopping my code

[anthory]

Hello,

First off sorry for not posting my version of compiler but I can't seem to find where it tell me what version I have. Where is it located at?

I'm programming a pic18f46k80, I also don't have internet on the computer I am programming on so I going to type it out. If I take out the delay I can see it change on my oscope but once I put one in it never makes it to the second set_pwm.

main.h

[PCM programmer]

[anthory]

I added in the #FUSES LP and tried #FUSES HS neither it didnt work. It is still getting hung up on the delay_ms statements.

Also the link you posted brings me to what the software versions fixed not how to find out what version I have.

[gpsmikey]

The link he posted was an EXAMPLE of version numbers (what to look for). As he indicated, at the top of the list file it will list the compiler version number.

mikey
_________________
mikey
-- you can't have too many gadgets or too much disk space !
old engineering saying: 1+1 = 3 for sufficiently large values of 1 or small values of 3

[PCM programmer]

Post the manufacturer and name of your PIC development board. Post a
link to it.

If you built the board yourself, describe the crystal or external oscillator
circuit (if any), that is connected to the 18F46K80's oscillator pins.

[Ttelmah]

Let's take things very slowly:

1) As PCM programmer has explained, the compiler version number is in the very first line of the .lst file generated when you compile. Find it, and post it. There are several numbers in this line, so he has also posted a link showing you what the version number looks like.

2) We need to know something about your hardware. What oscillator have you got attached to the chip?. LP won't work except with a low power (perhaps 100KHz or slower crystal) attached, while HS won't work without a crystal between perhaps 5MHz, and 25MHz attached. What have you got?. Key thing in programming and electronics design in general is _precision_. The clock statement says you are meant to be using a 16MHz oscillator, and won't work right, till you _are_ using such an oscillator.

3) How fast is the PWM you see without the delay?.

[anthory]

Let's take things very slowly:

1) As PCM programmer has explained, the compiler version number is in the very first line of the .lst file generated when you compile. Find it, and post it. There are several numbers in this line, so he has also posted a link showing you what the version number looks like.

2) We need to know something about your hardware. What oscillator have you got attached to the chip?. LP won't work except with a low power (perhaps 100KHz or slower crystal) attached, while HS won't work without a crystal between perhaps 5MHz, and 25MHz attached. What have you got?. Key thing in programming and electronics design in general is _precision_. The clock statement says you are meant to be using a 16MHz oscillator, and won't work right, till you _are_ using such an oscillator.

3) How fast is the PWM you see without the delay?.


1) Sorry about that. I am quite new to programming. verision 4.135

2) The pic data sheet states it has three Internal Oscillators: LF-INTOSC (31 KHz),
MF-INTOSC (500 kHz) and HF-INTOSC (16 MHz).

http://ww1.microchip.com/downloads/en/DeviceDoc/39977f.pdf

3) #use delay(clock=16Mhz)
PWM=1.9kHz


#FUSES LP
PWM= 95-105Hz

[oxo]

#fuses LP is not an alternative to #use delay(clock= 16M)

You have to specify both the type of oscillator as TTelmah has shown, and also the frequency with #use delay.

[anthory]

#fuses LP is not an alternative to #use delay(clock= 16M)

You have to specify both the type of oscillator as TTelmah has shown, and also the frequency with #use delay.


So if i specify #fuses LP i need to specify my clock to be #use (delay=31000) correct?

What do I use if I want the clock to be 16M? I dont see and #FUSES for it on this website http://www.ccsinfo.com/forum/viewtopic.php?t=31698

[Ttelmah]

Get your brain round a simple thing. Your _hardware_ has to match what you want to run.

If you want to run a crystal at 16MHz, you need to start with the crystal. Then HS, and clock=16MHz. LP, is saying to use a low power crystal, so again the crystal (typically a 32768Hz watch one), and clock=32768.

With your reference to 31KHz, I suspect you actually want to use the internal oscillator. In which case you need:

[gpsmikey]

One of the simplest (and best) pieces of test equipment is the simple LED on the board. put a routine to flash it at a 1 hz rate. If it isn't flashing at 1 HZ, then you don't have the oscillator configured correctly and everything else is going to be screwed up that uses timing. If you don't have an LED on the board, just a spare pin configured to change state at 1hz is good too. Without the clock right, you are just wasting your time on the rest of the stuff.

mikey
_________________
mikey
-- you can't have too many gadgets or too much disk space !
old engineering saying: 1+1 = 3 for sufficiently large values of 1 or small values of 3

[anthory]

[gpsmikey]

This is the first mention of trying to control a light - if you are trying to do phase control of the light (dimmer) then you need to work the problem of using a zero crossing detector to sync up. If you are simply flashing a light or something like that, that is different. Phase control is a different critter and needs to by sync'd to the AC line frequency unless you want really strange effects (although Halloween is coming up shortly ... )

If you are trying to implement a dimmer, do a search here or globally for "phase control" or "dimmer" for more info.

mikey
_________________
mikey
-- you can't have too many gadgets or too much disk space !
old engineering saying: 1+1 = 3 for sufficiently large values of 1 or small values of 3

[Ttelmah]

Also, you are not going to get very far with a CPU clock of 31000Hz, for anything involving phase control.

31000Hz = 7750 instruction/second.

Remember these are machine instruction, not C instructions. A simple C line line a=b*c, using int16, will take 236 machine instructions. 3 hundredths of a second. If trying to work with mains at 50 Hz, then you get a zero crossing every hundredth of a second, while at 60Hz, every 120th second. So just this one multiplication would take over three half cycles of the mains.....

The low speed clock, is designed for ultra low power operation, for things where being 'slow' doesn't matter. Not for anything that needs to work quickly.

Best Wishes

[anthory]