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PYNQSDR Quick Start

Pre-built images

Currently hosted on my "website" http://149.28.136.195/

Board

Plug extension boards together, make sure the PMOD plugins are in correct direction -- the 3V3/GND is on the left and IC is on the right:

Setup PYNQ-Z1 jumpers to boot from SD card. Use a stable power supply and avoid using USB hubs. Use a good ethernet cable.

Firmware

SD card's boot partition contains boot files, for PlutoSDR, put these into root directory:

uEnv.txt -- u-boot loading script
boot.bin -- ZYNQ FSBL including bitstream
uImage -- Linux kernel
devicetree.dtb -- Linux device tree
uramdisk.image.gz -- Linux root directory

For openwifi(all of these are different from the Pluto ones!):

uEnv.txt
boot.bin
uImage
devicetree.bin

Power on

Turn on the power, you'll see the red power LED on -- if this doesn't happen, immediately power off and check your board -- there's probably a short. After ~0.5s LD0-LD3 will have some action after bitstream is loaded. PlutoSDR: among the 4 green LEDs, some is brightly on. Openwifi: some are slightly on(as a simple check, don't rely on this).

Connect

Pluto

Linux terminal on USB serial port 115200 baud, root password is analog. Board IP will be 192.168.1.10 so set host IP to 192.168.1.2 or so.

Openwifi

Set host ethernet IP to 192.168.10.1, board IP will be 192.168.10.122, ssh into board, username: root, password: openwifi. USB serial port has early boot message but will stop after kernel booting(to be solved) so use SSH.

It's recommended to assign 2 IP addresses(192.168.10.1 and 192.168.1.2 at the same time) to a spare ethernet port.

Pluto

This blog for setup.

https://regymm.github.io/MyBlog/experience/2022/01/13/plutosdr-setup.html

Since ILA(Vivado internal logic analyzer) corresponding to the pre-built firmware is also included in the downloadable Vivado project, you can open hardware manager in Vivado, the ILA will automatically pop up.

Openwifi

Manually tune RX/TX:

~/tune.sh

dmesg to check tune OK:

SAMPL CLK: 40000000 tuning: RX
  0:1:2:3:4:5:6:7:8:9:a:b:c:d:e:f:
0:o o o o o o o o O o o o o o o o 
1:o o o o o # # # # # # # # # # # 
SAMPL CLK: 40000000 tuning: TX
  0:1:2:3:4:5:6:7:8:9:a:b:c:d:e:f:
0:# # # # # # # # # # # # # # # # 
1:# # # # # # # o o o o O o o o o

The script is just:

cd /sys/bus/iio/devices/iio\:device1
echo 40000000 > in_voltage_sampling_frequency

cd /sys/kernel/debug/iio/iio\:device1/
echo 0 > adi,digital-interface-tune-skip-mode 
echo 0 3 > digital_tune

dmesg

Start wifi:

~/openwifi/fosdem-11ag.sh

If you are building firmware youself: my board seems to need 10 dB TX attenuation for best transmission, so #define AD9361_RADIO_ON_TX_ATT 10000 in sdr.h

Troubleshooting

Just contact me...