DS2415
- Thread starter tjetson
- Start date
hippy
Ex-Staff (retired)
Welcome to the PICAXE forum.
Can I use the DS2415 One-Wire RTC with the Picaxe 08M?
No. But it probably can be used with PICAXE's which support OWIN and OWOUT commands.
is there such a thing as a i2c to One-Wire converter chip?
Yes; DS2482 and perhaps others.
http://www.maxim-ic.com/appnotes.cfm/an_pk/3684
Can I use the DS2415 One-Wire RTC with the Picaxe 08M?
No. But it probably can be used with PICAXE's which support OWIN and OWOUT commands.
is there such a thing as a i2c to One-Wire converter chip?
Yes; DS2482 and perhaps others.
http://www.maxim-ic.com/appnotes.cfm/an_pk/3684
westaust55
Moderator
The 18X also has i2c comms. By then, since you will have i2c, you might as well use the DS1307 or DS1338 RTC which are more frequently used with PICAXE chips.
What exactly is bit-banging? Would this involve the SERIN command?
westaust55
Moderator
Bit banging
Big Banging is where the user writes some program code typically to communicate with another device where the communications protocol, eg i2c is not provided by the master (ie PICAXE) chip.
Usually involves putting the data out one bit at a time in a serial manner (but could be a parallel format). Also usually requires a second signal line as a clock signal to indicate when each bit is ready.
A simple example is the SHIFTOUT command.
have a look at Manual 2 page 192 (manual V6.9)
In the X1 and X2 parts, this command is provided as part of the interpreter so the user can just use the SHIFTOUT command with its various control switches.
For earlier parts the manual gives BASIC program routines to achive the same thing. These routines are bit-bang code.
Big Banging is where the user writes some program code typically to communicate with another device where the communications protocol, eg i2c is not provided by the master (ie PICAXE) chip.
Usually involves putting the data out one bit at a time in a serial manner (but could be a parallel format). Also usually requires a second signal line as a clock signal to indicate when each bit is ready.
A simple example is the SHIFTOUT command.
have a look at Manual 2 page 192 (manual V6.9)
In the X1 and X2 parts, this command is provided as part of the interpreter so the user can just use the SHIFTOUT command with its various control switches.
For earlier parts the manual gives BASIC program routines to achive the same thing. These routines are bit-bang code.
westaust55
Moderator
At post 1, you were looking to use an o8M.
The issue there is that you only ahve 256 bytes for your program.
A simple SHIFTOUT using bit banging as per the manual could be okay but to try and do anything more complex, by the time you have an o2c routine running (I have not written a bit-bang version) ther would be no room left to achieve your other tasks.
By comparison, an 18X has 2048 bytes of program space AND also has 12c inbuilt.
The OWIN/OWOUT commands need an X1 or X2 part.
Another member on this forum was working with an i2c to one-wire interface.
Maybe you can do a search to find that thread.
The issue there is that you only ahve 256 bytes for your program.
A simple SHIFTOUT using bit banging as per the manual could be okay but to try and do anything more complex, by the time you have an o2c routine running (I have not written a bit-bang version) ther would be no room left to achieve your other tasks.
By comparison, an 18X has 2048 bytes of program space AND also has 12c inbuilt.
The OWIN/OWOUT commands need an X1 or X2 part.
Another member on this forum was working with an i2c to one-wire interface.
Maybe you can do a search to find that thread.
westaust55
Moderator
i2c bit-banging example
Here is a link to a thread started a couple of years back by hippy who wrote some bit-banging code for i2c comms. Indication is that Krannenborg may have done likewise.
http://www.picaxeforum.co.uk/showthread.php?t=5944
and
http://homepage.ntlworld.com/the.happy.hippy/picaxe/i2c2.txt
Here is a link to a thread started a couple of years back by hippy who wrote some bit-banging code for i2c comms. Indication is that Krannenborg may have done likewise.
http://www.picaxeforum.co.uk/showthread.php?t=5944
and
http://homepage.ntlworld.com/the.happy.hippy/picaxe/i2c2.txt