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Even more questions on I2C (1 viewing) (1) Guests
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TOPIC: Even more questions on I2C
#184
Alberto_82 (User)
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Gender: Male alberto_savioli@libero.it Location: Mantova Birthdate: 1982-12-09
Even more questions on I2C 3 Months, 1 Week ago Karma: 1  
Hi to all, guys!
My problems with i2c bus are driving me crazy!
I've tried to dial with a compass, HMC6352 by Honeywell, but I didn't receive no answers. So I've taken my oscilloscope to see if signals sequence on pins RG3_PIN56 and 57 (i2c port n°1) was right.. Surprise: no signal were sent by the Flex to the sensor. I tried to set and reset I2C1CONbits.I2CEN bit, to send the sensor as start sequence by the I2C1CONbits.SEN bit, but the line was kept low.
I don't know what to do...
Please help me!!

Tnx...

/Alberto
 
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#185
paolo.gai (Admin)
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Re:Even more questions on I2C 3 Months, 1 Week ago Karma: 4  
Alberto,

did you used the I2C code we used for the I2C compass in the _embed_ded World 2007 demo? I remember I have seen the device working...

bye

PJ
 
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#186
Alberto_82 (User)
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Gender: Male alberto_savioli@libero.it Location: Mantova Birthdate: 1982-12-09
Re:Even more questions on I2C 3 Months, 1 Week ago Karma: 1  
yes I did! But nothing works...
The problem is that I have to use it for my Thesis.. I'm of University of Pavia, Tullio is my supervisor and told me to contact you!!

Bye,
/Alberto
 
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#188
nino (Moderator)
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Re:Even more questions on I2C 3 Months, 1 Week ago Karma: 2  
You remembered to put the pull-up resistors on I2C bus clock and data lines?

You respected all the init phases? TRISxbits for directions, clock multipliers compatible with the system clock and so on?

Nino
 
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#190
Alberto_82 (User)
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Gender: Male alberto_savioli@libero.it Location: Mantova Birthdate: 1982-12-09
Re:Even more questions on I2C 3 Months, 1 Week ago Karma: 1  
Ehm... not at all! Where does the pull up resistors might be placed? I didn't know that, sorry. Is it on the EE docs? I'm going to try finding it, now.
Talkin' about the TRISxbits: yes, I think I've setted it in the right way, looking to the "pic30__embed_ded_World_2007" example.
I'm working to obtain something, now...
Thanks!!!

/Alberto
 
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Last Edit: 2008/09/25 10:56 By Alberto_82.
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#191
nino (Moderator)
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Re:Even more questions on I2C 3 Months, 1 Week ago Karma: 2  
In the demo folder you also can find the schematich for the homemade board. In that you can spot the resistors with the right placement and value.
 
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