ERIKA Enterprise Forums

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

Alberto,

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

bye

PJ

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

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

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_Embedded_World_2007\" example.
I\'m working to obtain something, now...
Thanks!!!

/Alberto

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.

Thank you!
I understand where to put the resistors... I\'m going to build the circuit!
Bye,
/Alberto

Thank you Nino!!!
Now it works!!! I\'ve just put the pull-up resistors in the right place and voilà, all works fine!!!

Many thanks...

/Alberto