RTC - code not working - Mel's example

[chuck]

Malc I brought one of those for my easy-pic spent hours and over severals day's thinking it was my code. Which I knew it did work in another project, At the time I was unsure about the code but when I loaded the hex file into my running project everything worked ok. so this led me to the RTC moudle (the one shown in the picture), So I built the curcuit on vero board and that worked percfet, There was one connection I never used, So in the end atfer waisting days hunting I just threw it in the bin and could not be botherd to send it back. I did look at but not found nothing

Have you tried your own simple circuit ?

[malc-c]

Thanks for the reply Chuck,

To be honest I've not tried breadboarding the chip like you suggest. I'll try that tomorrow and see if it makes any difference. Are you suggesting that there is a flaw with the EasyPIC5 board or just the RTC2 board... If the latter, why does it seem to work with other examples that write once to the module and then read the time back from that point... IMO it seems as if the code is doing strange things. I noticed that if I press the increment button it doesn't decrease by one unit, it seems to jump. Maybe the value on the LCD isn't the actual value that the counter is. EG, the hour displayed on the LCD hasn't refreshed to show the value the code has been set to by the button..

[Darrel Taylor]

Malc,

In the modified version of Melanie's code, you have ...

IncButton var PORTA.6	' Press to Increment Button

The 16F877A doesn't have a PORTA.6, and to the program it probably looks like the button is always pressed.
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[malc-c]

How did I miss that ! (embarrassed smile goes here !)

I'll re-compile tonight after work and see what happens

[malc-c]

Well must be something with the configuration of port A.

	DecButton var PORTD.0	' Press to Decrement Button
	SetButton var PORTD.1  'Press to Set/memorise Button
	IncButton var PORTD.2	' Press to Increment Button

The above works ! as does

	DecButton var PORTE.0	' Press to Decrement Button
	SetButton var PORTE.1  'Press to Set/memorise Button
	IncButton var PORTE.2	' Press to Increment Button

Thanks to all those who posted... at least I've proved my hardware is ok, just need to learn how to set up these devices correctly !

[Darrel Taylor]

Well must be something with the configuration of port A.

PORTA ... well, you have ...

ADCON1 = $0F

For a 16F877A it should be ...

ADCON1 = 7

Unless you want some analog channels.
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[malc-c]

PORTA ... well, you have ...

ADCON1 = $0F

For a 16F877A it should be ...

ADCON1 = 7

Unless you want some analog channels.
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I tried that well, ADCON1 = $0F but that didn't work... but then I'm currently using an 16f877a

[malc-c]

For a 16F877A it should be ...

ADCON1 = 7

Unless you want some analog channels.
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Uhmmm.. tried that and then changed the code to

	DecButton var PORTA.0	' Press to Decrement Button
	SetButton var PORTA.1  'Press to Set/memorise Button
	IncButton var PORTA.2	' Press to Increment Button

but that still left the 12/24 hr set mode over-writing each other again !

[jellis00]

Unless you want some analog channels.
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Malc-C, since it doesn't appear you are using any analog channels in your application I recommend you use DT's "AllDigital.inc" routine as an INCLUDE in your program. It works great and takes care of all the register settings you are trying to figure out so that you don't have a conflict of your digital processing with ports that are set for analog input.

[malc-c]

I'm looking at using the code to set a photo period, ie at a set time, say 11:00 pm lights go off, then at 06:00 am lights come on.

Is it a simple case of : (not actual code, more logic)

set off time
set on time

I2CRead SDApin,SCLpin,$D0,$00,[RTCSec,RTCMin,RTCHour,RTCWDay,RTCDay,RTCMonth,RTCYear,RTCCtrl]

If RTCHour=>off time or <=on time then lights off
Else lights on