Zephyr FPGA controller¶
This module is an FPGA driver that can easily load a bitstream, reset it, check its status, enable or disable the FPGA. This sample demonstrates how to use the FPGA driver API and the the FPGA controller shell subsystem. Currently the sample works with Quicklogic Quickfeather board.
Zephyr RTOS or
Zephyr RTOS with shell subsystem enabled (for shell application)
For building on QuickLogic QuickFeather board:
# From the root of the zephyr repository west build -b quick_feather samples/drivers/fpga/fpga_controller
To build the FPGA Controller shell application, use the supplied configuration file prj_shell.conf:
west build -b quick_feather samples/drivers/fpga/fpga_controller -- -DCONF_FILE=prj_shell.conf
See QuickFeather on how to load an image to the board.
Once the board is programmed, the LED should alternately flash red and green.
For the FPGA controller shell application, after connecting to the shell console you should see the following output:
Address of the bitstream (red): 0xADDR Address of the bitstream (green): 0xADDR Size of the bitstream (red): 75960 Size of the bitstream (green): 75960 uart:~$
This sample is already prepared with bitstreams. After executing the sample, you can see at what address it is stored and its size in bytes.
The FPGA controller command can now be used (
fpga load <device> <address> <size in bytes>):
uart:~$ fpga load FPGA 0x2001a46c 75960 FPGA: loading bitstream
The LED should start blinking (color depending on the selected bitstream). To upload the bitstream again you need to reset the FPGA:
uart:~$ fpga reset FPGA FPGA: resetting FPGA
You can also use your own bitstream. To load a bitstream into device memory, use devmem load command. It is important to use the -e option when sending a bistream via xxd:
uart:~$ devmem load -e 0x10000 Loading... Press ctrl-x + ctrl-q to stop
Now, the loader is waiting for data. You can either type it directly from the console or send it from the host PC (replace ttyX with the appropriate one for your shell console):
xxd -p data > /dev/ttyX
(It is important to use plain-style hex dump) Once the data is transferred, use ctrl-x + ctrl-q to quit loader. It will print the sum of the read bytes and return to the shell:
Number of bytes read: 75960 uart:~$
Now the bitstream can be uploaded again.
uart:~$ fpga load FPGA 0x10000 75960 FPGA: loading bitstream