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[Discuss-gnuradio] USRP2 set_gpio_ddr


From: Brett L. Trotter
Subject: [Discuss-gnuradio] USRP2 set_gpio_ddr
Date: Tue, 10 May 2011 22:46:24 -0500
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110419 Red Hat/3.1.10-1.el6_0 Thunderbird/3.1.10

I did a bench experiment here and observed that set_gpio_ddr is required
on a tx card but not an rx card. Is this intended?

Here is iotest.py (Python 2.5 required for ternary I used)

#!/usr/bin/env python

I2C_DEV_EEPROM = 0x50            # 24LC02[45]:  7-bits 1010xxx
I2C_ADDR_BOOT  = (I2C_DEV_EEPROM | 0x0)
I2C_ADDR_TX_A  = (I2C_DEV_EEPROM | 0x4)
I2C_ADDR_RX_A  = (I2C_DEV_EEPROM | 0x5)
I2C_ADDR_TX_B  = (I2C_DEV_EEPROM | 0x6)
I2C_ADDR_RX_B  = (I2C_DEV_EEPROM | 0x7)

from gnuradio import uhd
from gnuradio import eng_notation
from gnuradio.eng_option import eng_option
from optparse import OptionParser
import time

if __name__ == '__main__':
    device = uhd.usrp_sink(
      device_addr="addr=192.168.10.2",
      io_type=uhd.io_type_t.COMPLEX_FLOAT32,
      num_channels=1,
    )
    cmd_handle = device.get_dboard_iface()
    cmd_handle.set_gpio_ddr(uhd.dboard_iface.UNIT_TX, 0xFFFF, 0xFFFF)
    #cmd_handle.set_gpio_ddr(uhd.dboard_iface.UNIT_RX, 0xFFFF, 0xFFFF)
    toggle = False
    while True:
        print ("True" if toggle else "False")
        cmd_handle.set_gpio_out(uhd.dboard_iface.UNIT_TX, (0xFFFF if
toggle else 0x0000), 0xFFFF)
        cmd_handle.set_gpio_out(uhd.dboard_iface.UNIT_RX, (0xFFFF if
toggle else 0x0000), 0xFFFF)
        toggle = ~toggle
        time.sleep(1)



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