Nic,
     I have 10 second delays between each of the calls to send data to=20
the LCD. I'm able to count this and right now it is only 2 to 3 seconds.=20
The compiler didn't catch this overflow. I'll have to use a larger=20
variable such as a double.
Thanks,
rich!

On 10/25/2015 5:09 AM, Nicola Perotto wrote:
> Hi Rich,
>
>
> On 25/10/2015 06:39, Richard R. Pope wrote:
>> Hello everyone,
>>       Well I have it working reliably. Now I can't get my delay routines
>> to work correctly. No matter what I try my delays do not change.
> How you know this? How you measured the real delay?
>
>>   Would
>> someone look at my delay routines and see if they can spot what I am
>> doing wrong? Here are the routines:
>>
>> extern void wait_us(unsigned int delay)
>> {
>>       for(; delay; delay--)
>>       {
>>           NOP();      //This is about 500 nS at 1 MHz
> Here one error: at 1 MHz of clock the instruction clock is ever 1/4 so 25=
0 kHz =3D
> 4 microseconds.
> You can find this explained in paragraph 5.2 of datasheet.
>
>
>>           //NOP();      //Now we have one uS at 1 MHz
>>           //NOP();      //This is about 500 nS at 1 MHz
>>           //NOP();      //Now we have one uS at 1 MHz
>>           //NOP();      //This is about 500 nS at 1 MHz
>>           //NOP();      //Now we have one uS at 1 MHz
>>       }
>> }
>> extern void wait_ms(unsigned int delay)
> Here "unsigned int" is 16 bit =3D 0..65535
>
>>       {
>>           wait_us(delay * 1000);      //This gives us 1 millisecond
>>       }
>>
>> extern void wait_seconds(unsigned int delay)
>>       {
>>       wait_ms(delay * 1000);      //This is one second
> No! This is an overflow error! 1000*1000 > 65535!
> Check your compiler settings, this error can be catched at compile time
> (maybe... no experience with XC8).
>
>
>>       }
>>
>> Thanks,
>> rich!
> :-)
>        Nic
> *
> *


--=20
Richard R. Pope
President
Reedsburg Area Model Railroad Club, RAMRC
1230 19th Street #5
Reedsburg, WI 53959
608-768-7448
mechanic_2@charter.net

--=20
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