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Getting I2C up and running

troy.cowan.123

Hi. 

I'm trying to get the I2C functionality going in my application (running on a picozed).

As far as I can tell I've set up the PL correctly, enabling I2C 0 and connecting it to pins 50 and 51. In the PS, I'm using the iicps_v3_3 driver built into libxil.a. I'm calling the methods pretty much exactly as is done in the supplied example. When I attempt to send a couple of bytes out on the bus, nothing happens. I'm scoping the SCL and SDA lines, and they are not changing state at all. I never see the COMP bit or any error bit become active in the I2C registers. It's as though the I2C functionality is just inert or disabled. I'm stumped as far as how to troubleshoot this issue. Any help would be great, thanks!

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    Hello Troy,

    It seems like your trying to set up the PS I2C Controller on your PicoZed. If you refer to the PicoZed FMC Carrier Card V2 Hardware user guide located here http://zedboard.org/support/documentation/13076 you will notice in section 2.7 there is a note stating the PS_PMOD interface on the PicoZed SOM is by default is set to eMMC mode and not to the PS_PMOD your trying to interface to.

    In this case you can either use the resistor jumpers on your PicoZed SOM to have the default be to the PS_PMOD or you can toggle the MUX via GPIO in your application code. For an example of toggeling the MUX via GPIO please download the Tutorial 08 PS I2C PMOD reference design located here http://zedboard.org/support/design/13076/106

    In that reference desing please refer to the following directory \Supporting Documents\I2C\PS_PMOD\PicoZed. Look through that example code and you will see how I enabled the GPIO library and toggled the MUX's GPIO.

    --Josh

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    Hello Troy,

    It seems like your trying to set up the PS I2C Controller on your PicoZed. If you refer to the PicoZed FMC Carrier Card V2 Hardware user guide located here http://zedboard.org/support/documentation/13076 you will notice in section 2.7 there is a note stating the PS_PMOD interface on the PicoZed SOM is by default is set to eMMC mode and not to the PS_PMOD your trying to interface to.

    In this case you can either use the resistor jumpers on your PicoZed SOM to have the default be to the PS_PMOD or you can toggle the MUX via GPIO in your application code. For an example of toggeling the MUX via GPIO please download the Tutorial 08 PS I2C PMOD reference design located here http://zedboard.org/support/design/13076/106

    In that reference desing please refer to the following directory \Supporting Documents\I2C\PS_PMOD\PicoZed. Look through that example code and you will see how I enabled the GPIO library and toggled the MUX's GPIO.

    --Josh

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