Ds1302

Dave A

I am looking for help on creating an up ramp that will work with the DS1302 for setting time.

Mike Green

What do you mean by "up ramp"? That could mean all sorts of things. How do you want to make use of the DS1302? It's a Real-Time-Clock.

You really have to be much more specific about what you want to do if you want any kind of specific help.

Dave A

I am trying to set the time using a minuites button and an hours button. I was using a ramp generator that creats decimal output, but the DS13202 uses hex input. Any suggestions on how to do this.
Dave

Chris Savage

The DS1302 uses BCD, not Hex to store values. In order to increment the values and have them properly encode, you can use the following code snippets to convert the values from BCD to DEC to manipulate and then from DEC to BCD to send back to the DS1302. Simple change the name counter to the variable you're trying to modify. Use the BCD to DEC routine to before making changes and the DEC to BCD to store those changes back to the DS1302. I hope this helps.

BCD_Decimal:
  counter = (counter.NIB1 * 10) + counter.NIB0
  RETURN
                                ' Convert BCD To Decimal
Decimal_BCD:
  counter = (counter / 10 << 4) + (counter // 10)
  RETURN

Mike2545

We talked about this here http://forums.parallax.com/showthread.php?134992-Convert-a-hex-value-to-dec

I hope you find it useful