TRIS setting for the DS1302

[Dennis]

@Steve

Thanks for the trickle charger tip :-) now that table makes sense too :-) YAY

I added the code below (originally exactly as you gave it to me) see the updates, I haven't added all the possible options but I will so any line could be un-commented for any selection of the desired charger setup and will post the updates tomorrow sometime.

init:
'initialize the RTC and set the trickle charge rate
Low SCLK
low rst        ' Reset RTC
high rst       ' RTC Ready for transfer        
Shiftout IO, SCLK, LSBFIRST, [$8e, 0]  ' Enable write
low rst        
high rst
'Shiftout IO, SCLK, LSBFIRST, [$90, %10101011]  ' Set charger on and to "2 diodes, 8Kohm"              
'Shiftout IO, SCLK, LSBFIRST, [$90, %01011100]  ' inititial power state     
Shiftout IO, SCLK, LSBFIRST, [$90, %00000000]  ' disabled                       
Low RST         ' Reset RTC
return

Sadly the clock is still not working. I still just get a static display.
I have no buttons assigned to the clock as yet,so I didn't add any increment sub-routine..should I ?
I was hoping to just preset the time and it would start ticking away.
If I did add an increment sub-routine , would I need to add one for secs,mins,hours and day month and year ? Or just for mins and hours?

Kind regards
Dennis

Are there any other things I could try ?

Kind regards
Dennis

[Byte_Butcher]

Are there any other things I could try ?

I don't suppose you've got access to a 'scope?
The first thing *I'd* do is probe the oscillator pins on the DS1302 and see if THAT part of the clock is ticking.

steve

[Dennis]

@ Steve

I think I may have found the problem ....
It looks like I am using a 32.768 Mhz Crystal not a 32.768Khz one!
Will get 32.768 Khz crystals tomorrow and confirm :-)

Thanks a million for the info thus far :-)

Kind regards

Dennis

[Byte_Butcher]

Ahhh, yes... the wrong xtal would do it.

No amount of fooling with code and registers will help if the hardware is broken.

Last week I spent 2 hours looking over a data sheet to see what registers and settings were wrong when I couldn't get a new circuit to work.
The problem turned out to be 1 unsoldered pin on a 44TQFP part...

Let us know how it goes with the right xtal.


steve

[Dennis]

YAY it works :-)

@ Steve .... :-) so easy to miss a pin soldering sometimes or on a breadboard test even forget to put the PIC back into its socket after programming and then watching a blank serial debugger screen :-)
I remember years back in a PC workshop two of the technicians ,on inspection of a 'DEAD PC' that just arrived in, meticulously tested and replaced every component and card (drives,motherboard ,etc) in the PC including the case, eventually out of sheer frustration they called me in to check why it was still dead and the customer had been waiting nearly two weeks for their PC.
I checked the power cable first ... it was plugged into the PSU but it was on a long workbench so I followed the cable to its source... and there was the problem ...the mains switch for the wall plug was OFF :-)

Sometimes even the obvious is not so obvious and often we are in a huge rush, excited to get to the end result as soon as we can.

Thanks Steve and everyone else for all the help so far, I really appreciate it !

Kind regards

Dennis

[Dennis]

@Steve

To add an alarm(s) , would I just store a date and time in flash and then use an IF ..THEN statement as a matching trigger ?

Kind regards

Dennis

[BobK]

Hi Dennis,

You could do that or you could use the DS1337 that has 2 alarms built-in.
The DS1337 uses I2C communications and can be configured in several
different ways. Several years ago, Tony Galea presented an entire program
using the DS1337. Recently, JEllis posted his trials setting up this clock.
It doesn't have a battery charger like the DS1302 but it does have two separate alarm outputs. If you only need one alarm and need a 1hz pulse, the DS1337 will fill your needs. Check out the data sheet. I use alot of them and have a backup battery circuit for them.

HTH,

BobK

[Byte_Butcher]

@Steve

To add an alarm(s) , would I just store a date and time in flash and then use an IF ..THEN statement as a matching trigger ?

Kind regards

Dennis

Sure.
Store an alarm hour and and minute (and day if you want), and IF "current minute" >= "alarm minute" AND "current hour" >= "alarm hour" THEN gosub makeahelluvanoise.


steve