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MOBI Guru Joined: 02/12/2012 Location: AustraliaPosts: 819
Posted: 04:03pm 17 Mar 2013
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Hi,
I have hooked up a 10 bit i2c device to the MM i2c bus.
The msb and lsb are each read into an array value(2)
dim value(2)
i2crcv address,1,2,value(0),1,0
I print the data to screen as
print value(0), value(1)
For some reason, the value(1) writes values greater than 255 even when ANDed with 255 as in:
Print (value(1) and 255)
Am I missing something?
David M.
MOBI Guru Joined: 02/12/2012 Location: AustraliaPosts: 819
Posted: 05:15pm 17 Mar 2013
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Hi,
Sorry to trouble anyone - problem solved.
When I cleared the screen and set the Print @(x,y) - i had my coordinates wrong and was left with residual characters from previous read.
Begining to make a habit of these senior moments.
David M.
greybeard Senior Member Joined: 04/01/2010 Location: AustraliaPosts: 161
Posted: 05:42pm 17 Mar 2013
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They can't be that senior if you can remember doing them
djuqa Guru Joined: 23/11/2011 Location: AustraliaPosts: 447
Posted: 05:44pm 17 Mar 2013
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That is one of the advantages of being old and forgetful. Every day is a whole new adventure.VK4MU MicroController Units
Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9308
Posted: 12:04am 20 Mar 2013
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It's great you were honest enough to say you made a mistake.
Many would not...(not on this forum, but on other forums)Edited by Grogster 2013-03-21Smoke makes things work. When the smoke gets out, it stops!
MOBI Guru Joined: 02/12/2012 Location: AustraliaPosts: 819
Posted: 12:20am 20 Mar 2013
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Dis is not a prefix that goes with honest in my vocabulary.
I know you were not implying otherwise.
If we only reported the things that went right first time, it would be a boring old forum - we all make mistakes and I still laugh at most of mine. Anyway, it makes for a bit of light chit chat and in my world, I need all the levity I can get.David M.
MicroBlocks Guru Joined: 12/05/2012 Location: ThailandPosts: 2209
Posted: 12:47am 20 Mar 2013
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"Don't ya love it when it finally works!"
Which device are you using, a 10 bit dac?
Microblocks. Build with logic.
MOBI Guru Joined: 02/12/2012 Location: AustraliaPosts: 819
Posted: 01:24am 20 Mar 2013
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Yes, but it would be nice if....
The device is one of my home grown i2c PIC16F88's configured as 7 channel 10 bit A to D. Works quite well with minimal settling time. Certainly good enough for a caravan or solar (etc) monitoring system.
Doesn't look like there is much interest in i2c on this forum?? Can't understand why as I reckon it is far easier to hook up two wires instead of lots of dedicated i/o pins and many devices can be on line at the same time. Oh well...Edited by MOBI 2013-03-21David M.
MicroBlocks Guru Joined: 12/05/2012 Location: ThailandPosts: 2209
Posted: 02:29am 20 Mar 2013
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Yes, my favorite interface is plain old serial and I2C as a good second.
Serial mainly because they can be interrupt driven have receive and send buffers etc.
It makes programming so much easier.
I hate bitbanging with a passion. :)
And if bitbanging is really the only way, then let a cheap PIC(AXE) do it and hook it up through serial or I2C.
Even most parallel solutions can easily be done with a PMP port.
I would not mind a PIC32 with only 20 pins but still have 128Kb RAM.
Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me.
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