Hello everyone, I am trying to use my C6713 to write to an I2C EEPROM (Model:M24C02 - Addr: 0xA0 - Only device on the bus) but can't seem to be able to successfully perform a write cycle. While I was debugging using a Scope, I had realized that the 8th Bit of my "Device Select" transmission from the Master (C6713) is always high no matter which mode I am in (Master Recieve or Master Transmit) Please see attached graph. I also noticed that there are 3 bytes that get transmitted when there should only be Two. I would really appreciate it if anyone can help me with this issue ... I am also including my test code should anyone be able to pin point my error or even send some sample code. Thanks a lot. |
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Help with the I2C bus on the C6713 DSP
Started by ●August 19, 2004
Reply by ●August 20, 20042004-08-20
Hi Thami,
U will be enabling a start bit before writing the device address that
means this bit will be set until u send a stop signal, So check properly
whether this bit is getting reset by any means,since u require this to say
ur DSP to be master untill u finish writing all data to ROM.And when u
write a single byte at the 9th clock pulse just observe is there any ACK from
ROM, if u r able to write completely 1 byte properly u will be ACk'd by
ROM.
Since its a single device communicating on the I2C bus ensure all ur
writings are proper by single step execution.
Mean while if ur SDA line is high irespective of anything may be u will
have to check out the design schematics of ur target board.
-Mann
Bangalore
India
thamiral <t...@uwo.ca> wrote: Hello everyone,
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Reply by ●August 20, 20042004-08-20
Hello Mann, Thanks for your response... I think I had forgotten to include the code and the results that I am currently getting ... Mann, these files should shed light on how I am trying to implement the I2C protocol and I think it does match the description that you had provided in your response... I do look forward to hearing from you now that you have my results... Sincerely, ---------------------------- Taha Amiralli University of Western Ontario Electrical Engineering Support Canadian Arrow, Electrical Engineering team www.canadianarrow.com Sunstang Solar Array Manager SunStang Solar Car Project, Electrical Team http://hyperserver.engga.uwo.ca/sunstang/ Quoting manie dinchob <>: > Hi Thami, > > U will be enabling a start bit before writing the device address that means > this bit will be set until u send a stop signal, So check properly whether > this bit is getting reset by any means,since u require this to say ur DSP to > be master untill u finish writing all data to ROM.And when u write a single > byte at the 9th clock pulse just observe is there any ACK from ROM, if u r > able to write completely 1 byte properly u will be ACk'd by ROM. > Since its a single device communicating on the I2C bus ensure all ur writings > are proper by single step execution. > Mean while if ur SDA line is high irespective of anything may be u will have > to check out the design schematics of ur target board. > > -Mann > Bangalore > India > thamiral <> wrote: > Hello everyone, > > I am trying to use my C6713 to write to an I2C EEPROM (Model:M24C02 - > Addr: 0xA0 - Only device on the bus) but can't seem to be able to > successfully perform a write cycle. While I was debugging using a > Scope, I had realized that the 8th Bit of my "Device Select" > transmission from the Master (C6713) is always high no matter which > mode I am in (Master Recieve or Master Transmit) Please see attached > graph. > > I also noticed that there are 3 bytes that get transmitted when there > should only be Two. > > I would really appreciate it if anyone can help me with this > issue ... I am also including my test code should anyone be able to > pin point my error or even send some sample code. > > Thanks a lot. > > > _____________________________________ > Note: If you do a simple "reply" with your email client, only the author of > this message will receive your answer. You need to do a "reply all" if you > want your answer to be distributed to the entire group. > > _____________________________________ > About this discussion group: > > To Join: Send an email to > > To Post: Send an email to > > To Leave: Send an email to > > Archives: http://www.yahoogroups.com/group/c6x > > Other Groups: http://www.dsprelated.com > > Yahoo! Groups Links > > > --------------------------------- | |||
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