On 2021-08-19 11:32 a.m., [email protected] wrote:
Hello,
I am trying to get the GPIO header (J504) working on a USRP B210 for
power amplifier control in GNURadio. It appears this is possible based
on the documentation, but I am not having any success.
According to this user, GPIO support for the USRP B210 was added in
UHD 3.9:
https://lists.gnu.org/archive/html/discuss-gnuradio/2015-08/msg00418.html
However, I am running UHD 3.15, and I am getting the same error that
user was getting on UHD 3.8 when I call
self.uhd_usrp_sink_0.set_gpio_attr("TXA", "ATR_TX", 1, 0x10, 0):
RuntimeError: LookupError: Path not found in tree:
/mboards/0/dboards/A/iface
I added print(self.uhd_usrp_sink_0.get_gpio_banks(0)) above the line
causing the runtime error, and the three banks listed were ('FP0',
'RXA', 'TXA'). It appears that FP0 is the only bank that does not
raise this runtime error. I set all pins on this bank to ATR_TX by
setting the mask to 0xFFFFFFFF, however, none of the pins on the J504
header appear to change state when the USRP changes state from
transmit to receive. Does this bank actually correspond to any
physical pins on the B210, or is it just internal to the FPGA?
Is it possible this is a regression? If so, which version of UHD
should I use for GPIO control on the B210 until this is fixed? I would
rather not roll back all the way to version 3.9 from 2015.
Thanks.
The B2xx have the same GPIO API as X3XX devices, so you might consult
the example code in:
uhd/host/examples/gpio.cpp
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