Problem with EEPROM (24LC128)

MacGeek117

I've been trying to write/read to an EEPROM with this program, but nothing is working. Does anyone have any suggestions?
RoboGeek

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
"I reject your reality and subsitute my own!"

Adam Savage, Mythbusters
www.parallax.com
www.goldmine-elec.com
www.expresspcb.com
www.startrek.com


Post Edited (RoboGeek) : 2/17/2007 9:19:52 PM GMT

Bean

To read from I2C you need to start with a write command then issue another start condition. I know it's screwy, but that is how all I2C device work.

_READ:
 ADDR_MSB = __PARAM1
 ADDR_LSB = __PARAM2
 I2CSTART SDA
 I2CSEND SDA, STARTWRITE
 I2CSEND SDA, ADDR_MSB
 I2CSEND SDA, ADDR_LSB
 I2CSTART SDA
 I2CSEND SDA, STARTREAD
 I2CRECV SDA, TEMP, ACK
 I2CSTOP SDA
 RETURN

Bean.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Cheap used 4-digit LED display with driver IC·www.hc4led.com

Low power SD Data Logger www.sddatalogger.com
SX-Video Display Modules www.sxvm.com
Stuff I'm selling on ebay http://search.ebay.com/_W0QQsassZhittconsultingQQhtZ-1

"USA Today has come out with a new survey - apparently, three out of every four people make up 75% of the population." - David Letterman

MacGeek117

I tried the fix-no cigar. I even flipped the HIGH-LOW commands, but again, nothing. I don't understand whats happenning(or not happenning!).

RoboGeek

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
"I reject your reality and subsitute my own!"

Adam Savage, Mythbusters
www.parallax.com
www.goldmine-elec.com
www.expresspcb.com
www.startrek.com

Bean

I think you have your read and write codes swapped.
Read is %1010001 and write is %10100000

Bean.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Cheap used 4-digit LED display with driver IC·www.hc4led.com

Low power SD Data Logger www.sddatalogger.com
SX-Video Display Modules www.sxvm.com
Stuff I'm selling on ebay http://search.ebay.com/_W0QQsassZhittconsultingQQhtZ-1

"USA Today has come out with a new survey - apparently, three out of every four people make up 75% of the population." - David Letterman

MacGeek117

thank you for all your help, but it still doesn't work. I truly don't understand!
RoboGeek

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
"I reject your reality and subsitute my own!"

Adam Savage, Mythbusters
www.parallax.com
www.goldmine-elec.com
www.expresspcb.com
www.startrek.com

Bean

Your _READ routine must end with "RETURN TEMP" instead of just "RETURN".

Bean

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Cheap used 4-digit LED display with driver IC·www.hc4led.com

Low power SD Data Logger www.sddatalogger.com
SX-Video Display Modules www.sxvm.com
Stuff I'm selling on ebay http://search.ebay.com/_W0QQsassZhittconsultingQQhtZ-1

"USA Today has come out with a new survey - apparently, three out of every four people make up 75% of the population." - David Letterman

MacGeek117

If you know something I don't , please tell, because it stil won't work. I thing·I've been working with the Prop too long, because I don't remember·some of the quirks of SX/B,·and I sure haven't used I2C untill now.·Here's the new revision.
RoboGeek

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
"I reject your reality and subsitute my own!"

Adam Savage, Mythbusters
www.parallax.com
www.goldmine-elec.com
www.expresspcb.com
www.startrek.com

Bean

Do you have pull-ups on the SDA and SCL lines ?

Bean.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Cheap used 4-digit LED display with driver IC·www.hc4led.com

Low power SD Data Logger www.sddatalogger.com
SX-Video Display Modules www.sxvm.com
Stuff I'm selling on ebay http://search.ebay.com/_W0QQsassZhittconsultingQQhtZ-1

"USA Today has come out with a new survey - apparently, three out of every four people make up 75% of the population." - David Letterman

MacGeek117

Thank you, Bean!!! It works!!! I completely forgot about the pull-ups.
RoboGeek

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
"I reject your reality and subsitute my own!"

Adam Savage, Mythbusters
www.parallax.com
www.goldmine-elec.com
www.expresspcb.com
www.startrek.com
·

Guenther Daubach

Please guys, allow me one comment on this thread:

I think all of you agree with me that Bean is one of the best "bug detectives" here in the forum. Nevertheless, it would save Bean's and other helpers a lot of time (but also the time of a "problem poster") when you post your problem together with the program code in question, but also a schematic showing the SX and its hardware environment.

Typically, microcontroller applications consist of hardware and software, so it helps a lot giving problem support when both parts can be inspected right away. I'm sure that Bean (or someone else) would have been able to figure out the missing pull-ups right on your first post when you had attached the code and the schematic together with it. Without this, it took some "ping-pong" posts, plus some (very professional) guesswork from Bean to figure out the problem.

Please get me right - this is constructive criticism only, but I think it is a good example for new (and maybe old) forum members how to optimize their requests, and how to get exactly the hint they need to fix a problem.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Greetings from Germany,

G

Bean

RoboGeek
Your welcome.

And to Guenther's point, I'm reminded of a saying, "A problem well defined is a problem half solved".
The forum member's are good, but the more information you provide the better chance that your problem will be solved.

Bean.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Cheap used 4-digit LED display with driver IC·www.hc4led.com

Low power SD Data Logger www.sddatalogger.com
SX-Video Display Modules www.sxvm.com
Stuff I'm selling on ebay http://search.ebay.com/_W0QQsassZhittconsultingQQhtZ-1

"USA Today has come out with a new survey - apparently, three out of every four people make up 75% of the population." - David Letterman

MacGeek117

Good point. If you want it, here is the schematic. Again, thank you for all your help!
RoboGeek

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
"I reject your reality and subsitute my own!"

Adam Savage, Mythbusters
www.parallax.com
www.goldmine-elec.com
www.expresspcb.com
www.startrek.com