Re: [Discuss-gnuradio] uhd help

[Josh Blum]

On 07/04/2012 11:38 AM, Samuel Ibarra wrote:
> Hello Josh,
> 
> I have looked over the dboard iface file, but I am still a little confused.
> I am able to use swig to call the dboard_iface() within my python code,
> but I am not sure about what other functions I need in order to control
> those pins. I saw that within the dboard_xcvr2450.cpp file they call
> set_pin_ctrl, set_gpio_ddr, and set_atr_reg. Do I also need to call all
> three? I am also unsure about the inputs that go into these functions.
> Thank you for help and time.
> 

Well, setting output and data direction is a lot like any GPIO.

Whats different here is ATR. When you set a pin to be under ATR control,
the pin can be transitioned when the FPGA changes state (rxing, idle,
txing, full duplex). Setting ATR state tells the pins what the output
should be under each FPGA state. This makes switching automatic.

-josh

> Sam
> 
> On Mon, Jul 2, 2012 at 6:42 PM, Josh Blum <address@hidden> wrote:
> 
>>
>>
>> On 07/02/2012 06:34 PM, sibar002 wrote:
>>>
>>> Hello,
>>>
>>> I would like to be able to control pins 5, 7, 9,... , and 35 on the J401
>>> component on the N210 (Pins G4, F5, H6, ..., and K6 on the FPGA). From
>> the
>>> Basic_Tx/Rx daughterbaord schematic, I was able to see that some of these
>>> pins are not really used on the daughterboard. I am working on
>> implementing
>>> a MAC protocol that will be using a number directional antennas to send
>> our
>>> information. I wanted to use these pins in order to select the antenna
>>> direction needed for the communication. I have followed the code all the
>> way
>>> to the multi_usrp.cpp file. I have also looked into the db_xcvr2450.cpp
>> file
>>> to see how this pins are controlled. I am having trouble figuring out
>> which
>>> lines of code I need in the db_basic_lf.cpp in order to control these
>> pins
>>> in the basic daughterboards. I would greatly appreciate any help or
>> advice.
>>> Thank you for your time and help.
>>>
>>> Sam
>>>
>>
>> You may want to see the dboard iface:
>>
>> http://files.ettus.com/uhd_docs/doxygen/html/classuhd_1_1usrp_1_1multi__usrp.html#a3299d8f77f1d823c762e36438bac509e
>>
>> You can access the same GPIO as the daughterboard code itself. Also, the
>> swig magic should be there so you can use it from python.
>>
>> -josh
>>
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>