Hi All,
I'm trying to use the internal GPIO connector of an N321 to read an external
digital signal.
Cabling: after looking at the N321 schematic, I found that the GPIO connector
on the board mates with a Molex duo-clasp connector, 20 contacts, 2 rows. After
buying the casing and the pins I patched up a cable exposing all 20 pins. Is
anyone aware of a better option to connect to the GPIO interface?
UHD api: running the GPIO example from uhd 4.2 (with no nothing connected to
the GPIO) I get the attached output. The way I interpret this is that all the
registers are reading 1. This seems weird as I would expect the values of
unconnected pins to be 0.
Running the test again with all data pin grounded to the GPIO Vss or connected
to the 3.3V produces the same output.
Is the GPIO interface working at all on the N321?
Thanks,
Lorenzo
$ ~/uhd/host/build/examples$ sudo ./gpio --args="master_clock_rate=200e6"
--bitbang --ddr 0x0 --out 0x0 --repeat
Creating the usrp device with: master_clock_rate=200e6...
[INFO] [UHD] linux; GNU C++ version 7.5.0; Boost_106600; UHD_4.2.0.0-4-g04d14cd7
[INFO] [MPMD] Initializing 1 device(s) in parallel with args:
mgmt_addr=192.168.20.2,type=n3xx,product=n320,serial=<my
serial>,name=ni-n3xx-31CCFB3,fpga=XG,claimed=False,addr=192.168.20.2,master_clock_rate=200e6
[INFO] [MPM.PeriphManager] init() called with device args
`fpga=XG,master_clock_rate=200e6,mgmt_addr=192.168.20.2,name=ni-n3xx-31CCFB3,product=n320,clock_source=internal,time_source=internal'.
[INFO] [MPM.Rhodium-0] init() called with args
`fpga=XG,master_clock_rate=200e6,mgmt_addr=192.168.20.2,name=ni-n3xx-31CCFB3,product=n320,clock_source=internal,time_source=internal'
[INFO] [MPM.Rhodium-1] init() called with args
`fpga=XG,master_clock_rate=200e6,mgmt_addr=192.168.20.2,name=ni-n3xx-31CCFB3,product=n320,clock_source=internal,time_source=internal'
[INFO] [MPM.Rhodium-0.init.LMK04828] LMK initialized and locked!
[INFO] [MPM.Rhodium-1.init.LMK04828] LMK initialized and locked!
[INFO] [MPM.Rhodium-0.DAC37J82] DAC PLL Locked!
[INFO] [MPM.Rhodium-0.AD9695] ADC PLL Locked!
[INFO] [MPM.Rhodium-0.init] JESD204B Link Initialization & Training Complete
[INFO] [MPM.Rhodium-1.DAC37J82] DAC PLL Locked!
[INFO] [MPM.Rhodium-1.AD9695] ADC PLL Locked!
[INFO] [MPM.Rhodium-1.init] JESD204B Link Initialization & Training Complete
Using Device: Single USRP:
Device: N300-Series Device
Mboard 0: n320
RX Channel: 0
RX DSP: 0
RX Dboard: A
RX Subdev: Rhodium
RX Channel: 1
RX DSP: 1
RX Dboard: B
RX Subdev: Rhodium
TX Channel: 0
TX DSP: 0
TX Dboard: A
TX Subdev: Rhodium
TX Channel: 1
TX DSP: 1
TX Dboard: B
TX Subdev: Rhodium
Using GPIO bank: FP0
rx_subdev_spec: A:0 B:0
tx_subdev_spec: A:0 B:0
Initial GPIO values:
Bit: 10 9 8 7 6 5 4 3 2 1 0
CTRL: 0 0 0 0 0 0 0 0 0 0 0
DDR: 1 1 1 1 1 1 1 1 1 1 1
ATR_0X: 0 0 0 0 0 0 0 0 0 0 0
ATR_RX: 0 0 0 0 0 0 0 0 0 0 0
ATR_TX: 0 0 0 0 0 0 0 0 0 0 0
ATR_XX: 0 0 0 0 0 0 0 0 0 0 0
OUT: 0 0 0 0 0 0 0 0 0 0 0
READBACK: 0 0 0 0 0 0 0 0 0 0 0
SRC: RF0 RF0 RF0 RF0 RF0 RF0 RF0 RF0 RF0 RF0 RF0 RF0
Configured GPIO values:
Bit: 10 9 8 7 6 5 4 3 2 1 0
CTRL: 0 0 0 0 0 0 0 0 0 0 0
DDR: 0 0 0 0 0 0 0 0 0 0 0
ATR_0X: 0 0 0 0 0 0 0 0 0 0 0
ATR_RX: 0 0 0 0 0 0 0 0 0 0 0
ATR_TX: 0 0 0 0 0 0 0 0 0 0 0
ATR_XX: 0 0 0 0 0 0 0 0 0 0 0
OUT: 0 0 0 0 0 0 0 0 0 0 0
READBACK: 1 1 1 1 1 1 1 1 1 1 1
SRC: RF0 RF0 RF0 RF0 RF0 RF0 RF0 RF0 RF0 RF0 RF0 RF0
Press Ctrl + C to quit...
READBACK: 1 1 1 1 1 1 1 1 1 1 1
Loop 1 completed
Press Ctrl + C to quit...
READBACK: 1 1 1 1 1 1 1 1 1 1 1
Loop 2 completed
Press Ctrl + C to quit...
READBACK: 1 1 1 1 1 1 1 1 1 1 1
Loop 3 completed
Press Ctrl + C to quit...
READBACK: 1 1 1 1 1 1 1 1 1 1 1
Loop 4 completed
Press Ctrl + C to quit...
READBACK: 1 1 1 1 1 1 1 1 1 1 1
Loop 5 completed
Press Ctrl + C to quit...
READBACK: 1 1 1 1 1 1 1 1 1 1 1
Loop 6 completed
Press Ctrl + C to quit...
READBACK: 1 1 1 1 1 1 1 1 1 1 1
Loop 7 completed
Press Ctrl + C to quit...
READBACK: 1 1 1 1 1 1 1 1 1 1 1 1
Done!
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