SPIN i2c object and 6 examples (code) - Updated v1.2

Javalin

All,

Attached is a SPIN project achieve that implements single a master I2C SPIN object.· I've also included six device objects and a·basic LCD (for debug) object.· The objects demo the the popular·i2c-bus and·devices:
·· -> DS1307 - real time clock
·· -> DS1621 - temperature sensor
·· -> 24LC256 - i2c serial EEPROM
·· -> (NEW v1.2) MD22 Motor Controller (http://www.robotelectronics.co.uk)
·· -> (NEW v1.2) SRF08 Ultrasonic Sensor (http://www.robotelectronics.co.uk)
·· -> (NEW v1.2) MCP23016 - i2c I/O Expander

This is provide free to Parallax Propeller users - I'll provide some support if you post to this thread.

Future development work I intend will be to add objects for the:
··· -> Multi-Master arbitration if I can find another master that implements arbration, and get my hands on a decent O-Scope!!
··· -> ASM version for speed! - when the manual is released (hint,hint)
·- so (keep) watching this space

I've fairly fully tested these libraries, but I'd appriate any feedback from you all!· If you run it multi-cog watch out for the multi-cog IO pin rules!

The device libraries are fairly light on functions and can be expanded to provide all device functions.

Questions, comments and·feedback is welcomed!

Enjoy!

James

Updated:
· version 1.1 - slight tidy up. Doc & Code.
· version 1.2 - slight tidy up. Doc & Code.· Added MD22, SRF08 and MCP23016 objects.· General improvements

Post Edited (Javalin) : 5/15/2006 8:14:58 PM GMT

Martin Hebel

Excellent job James! Didn't take you long [noparse]:)[/noparse] This helps a lot since I've been considering the 1307 for a project.

Look for my mail outside here...
-Martin

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Martin Hebel
Southern Illinois University Carbondale - Electronic Systems Technologies

Personal Links with plenty of BASIC Stamp info
StampPlot - Graphical Data Acquisition and Control

Javalin

Hi Martin,

Thanks. I've been working 12+ hours a day on it since Friday! Going to work next week to sleep!

The propeller rules!

Will do.

James

Javalin

All,

Library update.

James

Ym2413a

Wow James. That's really cool.
I2C is so useful, I'm glad someone wrote an object for it so fast.
I can't wait until I get my Propeller in the mail! This little thing seems so cool.

--Andrew "A"

Stan671

Thank you, James. I was going to use another EEPROM to store some data and the DS1307 RTC and the 1621 temp sensor anyway, so you have done me a great service. Thanks.

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Stan Dobrowski

Javalin

Thanks chaps, let me know how you get on.......

Litefire

hey, i've been having some trouble with I2C. I've got a propeller (duh!) and an MD23 (same company as the MD22 that you've shown here) motor controller board. But try as i may, i just cannot get the MD23 to cooperate.

Here's my current setup:

A3 -> SDA w/ pullup resistor (to 3.3V)
A4 -> SCL w/ pullup resistor (to 3.3V)

I've tried to get help with this before, but i just cannot fathom what could be wrong with it. I even tried with my trusy BS2 and a similar sample program... but there just isn't any love here.

When i get home i'll get some of the code i've been using up and running... since you've been working with the MD22, i was hoping you could help at least a little.

~~Brian

Javalin

Hi Brian,

Well I can try!! Have you downloaded version 1.3 of the library?

From a wireing side, you should have the MD23 powered by +5V and the SDA/SCL connected to the propeller's pins as shown for the +5V devices in the i2cDemoApp.spin

Then I suggest to prove the circuit you edit the i2cDemoApp.spin file to only run the i2cScan and edit it to output to a TV or serially to your PC etc. It should show an ACK on 0xB0 (176 decimal)
Let me know how you get on.

James