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[Discuss-gnuradio] problem on write fpga reg


From: Yan Nie
Subject: [Discuss-gnuradio] problem on write fpga reg
Date: Fri, 13 Aug 2010 16:58:15 -0400

Hi all,

I'm working on a synchronization block to allow the transmitter and receiver to co-locate on the same motherboard and work alternatively, transmitter working for 0.5 second then receiver working for 0.5 second, and then repeat this process.

I'm using USRP1 and LFTX/RX to develop my transmitter and receiver, which work well when transmitter and receiver are plugged on two USRP1 mother board.

I'm trying to write fpga register FR_MASTER_CTRL to enable transmitter board or receiver board every 0.5 second, in order to implement tx and rx working alternatively. The functions defined for enabling tx and rx is shown as followed.

def write_mode(self):
        self._u._write_fpga_reg(FR_MASTER_CTRL, self.mode)

def enable_tx(self, value):
        if value:
        if self.verbose:
           print "Enabling transmitter."
           self.mode |=bmFR_MC_ENABLE_TX
           self.transmitting = True
        else:
        if self.verbose:
           print "Disabling transmitter."
        self.mode &=~bmFR_MC_ENABLE_TX
        self.write_mode()

def enalbe_rx(self, value):
        if value:
        self.mode |=bmFR_MC_ENABLE_RX
        self.write_mode()
        self.rcvr.start()
        self.receiving = True
        else:
        self.rcvr.stop()
        self.mode &=~bmFR_MC_ENABLE_RX
        self.write_mode()
        self.receiving = False

def start(self):
        if self.tx:
        self.enable_tx(True)
        if self.rx:
        self.enable_rx(True)

However,  i got an AttributeError

File "/home/john/gnuradio/gr-iono/usrp_ionsonde_control.py", line 197, in set_reset
    self.write_mode()
  File "/home/john/gnuradio/gr-iono/usrp_ionsonde_control.py", line 166, in write_mode
    self._u._write_fpga_reg(FR_MASTER_CTRL, self.mode)
  File "/usr/local/lib/python2.5/site-packages/gnuradio/gr/hier_block2.py", line 50, in __getattr__
    return getattr(self._hb, name)
AttributeError: 'gr_hier_block2_sptr' object has no attribute '_write_fpga_reg'

What's the problem may be? Could this fpga reg be written every half second or even 20 microseconds?

Thank you so much for help.

Yan

Attachment: ynie3.vcf
Description: Card for Yan Nie <ynie3@uwo.ca>


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