iic Device Id

Question

Hello friends,

i'm working on iicps examples for establishing i2c communication between a zedboard and a sensor(i2c based). In the examples for iic there is a macro IIC_DEVICE_ID. and in the main there is a comment,

/*

* Run the Iic Slave Monitor example, specify the Device ID that is

* generated in xparameters.h.

*/

what is this Device ID macro ??

Thanks in advance.

Former Member · Accepted Answer

Hello 473srikanth,

As you have found the instance or 'device id' of the IIC device you are using is defined in the xparameters.h file that was generated as part of your BSP to match your hardware configuration. This device ID is passed to the example code you reference above which, in turn, calls code defined in the xiicps.h file that is in the 'src' directory of the iicps_v3 drivers. Here is a snippet of the coments in the xiicps.h code regarding use of the DeviceID:

* The XIicPs_Config structure is used by the driver to configure itself. This

* configuration structure is typically created by the tool-chain based on HW

* build properties.

*

* To support multiple runtime loading and initialization strategies employed by

* various operating systems, the driver instance can be initialized in the

* following way:

*

* - XIicPs_LookupConfig(DeviceId) - Use the device identifier to find

* the static configuration structure defined in xiicps_g.c. This is

* setup by the tools. For some operating systems the config structure

* will be initialized by the software and this call is not needed.

You can follow the declaration through the calls in the example code for more details.

-Gary