18F4431 - setup_timer_5() is not documented...

[LloydSargent]

<drum roll>

Okay, here is the answer:

When using a 18F4431 attempting to use the function setup_timer_5() does not work.

What does work is setup_timer_4(mode, period, postscale)... Except it doesn't. Apparently this code was never really FULLY completed. It DOES write the mode to T5CON. That is a good thing.

HOWEVER, it does not write the period. A very bad thing. Worse, there IS no postscale on Timer 5!

Oh, well, so much for pathos...

Cheers,

Lloyd

[ckielstra]

You forgot one possible answer:
d) Timer 5 has a new format.

Sorry, you never mentioned which compiler version you have, but I guess it is one of the latest versions. I have v3.187 from a few months ago and that version doesn't support your chip. So, you will not like this, but it looks like you are the first one to test the Timer5 functionality. Consider it a Beta release....

Looking at the specs for the Timer5 it requires settings that are somewhere in between the functionality of Timer1 and Timer2. Timer5 has a period value but doesn't have a postscaler.

CCS is (again) sloppy with their documentation, but doing an educated guess I would try the following format:

setup_timer_5(mode, period)

[ckielstra]

Do you know there is a utility for setting the device configurations? It is called chipedit.exe and is located in the same directory as your compiler. I'm curious whether CCS has configured the PIC18F4431 correctly here (I have an older version of the compiler than you have, so can't check it myself).

[LloydSargent]

[ckielstra]

I think you have put enough time into this. Mail your question to CCS, often you get a response within a day. Please post the answer you get here in the forum.

[LloydSargent]

[MGP]

This is a totally "left field" question, but do you have your compiler options set for "case sensitive"?

I noticed in the CCS header file you posted that the function names are all CAPS. If they are truly that way in the CCS library and you have case sensitivity turned on, the compiler would reject any of the different options you tried, yes?

Like I said, just a quick thought on something that's caught me out before...

[MGP]

uhhh... nevermind. I was slow in posting my response.

[uController]

Any answer from CCS on this yet?
If not I will call them and compain. (again)
Would be nice if they posted these issues and solutions here.
It's very frusterating developing a simple microcontroller project
and constantly woundering if I made a mistake or is a compiler
problem.
I would be hung if I produced software like this.

Thanks for all the help everyone,
uC

[ckielstra]

See the release notes:

[uController]

I am using V3.212 which is the latest.
Same problem.
Any other suggestions?

Here is how I am trying to implement it;
setup_timer_5(T5_INTERNAL | T5_DIV_BY_1);

Here is the error;
Undefined identifier setup_timer_5

Here is the header info;
// Timer 5 Functions: SETUP_TIMER_5, GET_TIMER5, SET_TIMER5
// Constants used for SETUP_TIMER_5() are:
// (or (via |) together constants from each group)
#define T5_DISABLED 0
#define T5_INTERNAL 0x01
#define T5_EXTERNAL 0x07
#define T5_EXTERNAL_SYNC 0x03

#define T5_DIV_BY_1 0
#define T5_DIV_BY_2 0x08
#define T5_DIV_BY_4 0x10
#define T5_DIV_BY_8 0x18

#define T5_ONE_SHOT 0x20

#define T5_DISABLE_SE_RESET 0x40

#define T5_ENABLE_DURING_SLEEP 0x80


I suppose I wil just have to call them. (AGAIN!!!)
I spend more time on the phone with them debugging the compiler
than writing code. This is very disappointing!

Thanks,
uC

[PCM programmer]

When the compiler doesn't support some function that you need,
then you should write it yourself. This is done by defining the
register addresses with #byte statements (and possibly some
bits with #bit statements) and then by writing a function or macro
to set the registers to the appropriate values. You consult the
data sheet and also look at the ASM code for similar functions
that do compile properly. Use those as a guide to writing
your own functions.

In the example below, I have written a macro to emulate the
CCS setup_timer_5() function, which is apparently not supported yet.


#include <18F4431.H>
#fuses XT, PUT, BROWNOUT, NOWDT, NOLVP
#use delay(clock=4000000)

#byte T5CON = 0xFB7

#define setup_timer_5(mode) T5CON = (mode)

//==================================
void main()
{

setup_timer_5(T5_INTERNAL | T5_DIV_BY_1);

while(1);
}


//=================================