These delays are frequently implemented as macros by compilers, and have=20
little or no bounds checking, so I would take a look at the nachine code=20
generated by the compiler, and make sure you're not getting some=20
overflow (casting too large a number into too small a register(set)).   =20
I would expect that, if you had tried increasing the time by giving=20
Delay10TCYx a larger integer, but since you changed to Delay100TCYx with=20
a smaller value, it's not evident what it is.

Joe W


On 11/29/2013 10:59 AM, Neil wrote:
> Bump.  Hoping someone here can assist with this...
>
>
>
> Quoting Neil <picdude3@narwani.org>:
>
>> Also just tried this on another computer with MPLAB v8.76 and C18
>> v3.42.  Same non-working behaviour.
>>
>> Cheers,
>> -Neil.
>>
>>
>>
>> Quoting Neil <picdude3@narwani.org>:
>>
>>> Happy Thanksgiving US folks,
>>>
>>> Trying to figure out why code isn't working, I've whittled it down to
>>> this oddity:
>>>
>>> This works, toggling LED's repeatedly as expected...
>>>
>>> while (1)
>>> {
>>> 	TRISC =3D 0b10101010;			// '0's will turn LED's on.
>>> 	for (x=3D0; x<200; x++)
>>> 	{
>>> 		Delay10TCYx(255);
>>> 		res++;				// Dummy task
>>> 	}
>>> 	TRISC =3D 0b01010101;			// '0's will turn LED's on.
>>> 	res++;					// Dummy task
>>> 	for (x=3D0; x<200; x++)
>>> 	{
>>> 		Delay10TCYx(255);
>>> 		res++;				// Dummy task
>>> 	}
>>> }
>>>
>>>
>>> However, when I switch delay functions and adjust the time units
>>> accordingly, the code stalls at the delay...
>>>
>>> while (1)
>>> {
>>> 	TRISC =3D 0b10101010;			// '0's will turn LED's on.
>>> 	for (x=3D0; x<200; x++)
>>> 	{
>>> 		Delay100TCYx(26);
>>> 		res++;				// Dummy task
>>> 	}
>>> 	TRISC =3D 0b01010101;			// '0's will turn LED's on.
>>> 	res++;					// Dummy task
>>> 	for (x=3D0; x<200; x++)
>>> 	{
>>> 		Delay100TCYx(25);
>>> 		res++;				// Dummy task
>>> 	}
>>> }
>>>
>>>
>>> This is a fresh install of MPLAB 8.66 with C18 v3.46.  I've disabled
>>> all optimizations in the project's build options.  What else should I
>>> be checking, or is this a legitimate bug with the compiler/libraries?
>>> FWIW, I also noticed that I could previously use "while (1)" for
>>> infinite loops, but now the compiler hangs for several minutes, memory
>>> usage climbs significantly, then just fails to compile.
>>>
>>> Cheers,
>>> -Neil.
>>>
>>>
>>>
>>> --
>>> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
>>> View/change your membership options at
>>> http://mailman.mit.edu/mailman/listinfo/piclist
>>>
>>
>>
>> --
>> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
>> View/change your membership options at
>> http://mailman.mit.edu/mailman/listinfo/piclist
>>
>
>


--=20
Joe Wronski
jwronski@stillwatereng.net
www.stillwatereng.net

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