PYNQ | Python Productivity for ZYNQ
kandi X-RAY | PYNQ Summary
kandi X-RAY | PYNQ Summary
PYNQ is an open-source project from Xilinx that makes it easy to design embedded systems with Zynq All Programmable Systems on Chips (APSoCs). Using the Python language and libraries, designers can exploit the benefits of programmable logic and microprocessors in Zynq to build more capable and exciting embedded systems. PYNQ users can now create high performance embedded applications with. See the PYNQ webpage for an overview of the project, and find documentation on ReadTheDocs to get started.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of PYNQ
PYNQ Key Features
PYNQ Examples and Code Snippets
Lines of Code : 12License : Strong Copyleft (CC BY-SA 4.0)
Copynp.round(data_in*2**15).astype(np.int16) # returns -16384
np.round(data_in*2**15).astype(np.uint16) # returns 49152
from fxpmath import Fxp
#...
data_in_fxp = Fxp(data_in, dtype='fxp-s16/15') # or dtype='S1.15'
leds = []
for index in range(MAX_LEDS):
leds.append(base.leds[index])
leds = [base.leds[index] for index in range(MAX_LEDS)]
leds = []
for index in range(MAX_LEDS):
if 'green' in baCommunity Discussions
Trending Discussions on PYNQ
QUESTION
I am currently using the pynq-z2 FPGA eval board manufactured by TUL to design applications. It has a Processor+FPGA SoC Zynq7020 on it. The pynq python package allows us to interact with the PS and PL quite well via jupyter notebooks.
I wanted to know if we could write the verilog codes for the PL in the new languages like migen 1 and chisel on pynq supported boards. Currently I am writing VHDL/verilog files in Vivado and creating IPs and circuit design in PL.
More info about migen: https://m-labs.hk/migen/manual/introduction.html
More info about chisel: https://www.chisel-lang.org/chisel3/docs/introduction.html
...ANSWER
Answered 2021-Nov-25 at 15:16QUESTION
I need to convert a float64 value into a fixed point <16,15> (16 bit with 15 bit in the fractional part and 1 in the integer part).
I have already read many solutions:
However I have not really understood the "type" I need in my specific case.
To explain this better, I have implemented a code that generates a simple sine wave inside PYNQ (the Xilinx framework based on Python):
...ANSWER
Answered 2021-May-06 at 13:04I suppose that FFT expects ap_fixed<16,15>, where MSB is the sign bit. In your example you have signed samples (because sinusoidal between -1.0 and 1.0), so your casting must be int (signed int). But if you need a two-complement representation of signed int, it's right if you cast with uint. In both cases, cast with 16 bits is enough.
QUESTION
When I try to complile the dhrystone benchmark, it shows the following errors:
...ANSWER
Answered 2020-Sep-07 at 10:06When you use nostdlib, the compiler not use the standard system startup files or libraries when linking.
https://gcc.gnu.org/onlinedocs/gcc/Link-Options.html
The only library you are linking against by using your command line is libgcc, but you are using functions from libc. you need to add -lc and most likely -lgloss. be careful with circular dependencies ( --start-group --end-group).
You can add the -v option and compile a minimalist example with the default options to see how it is done by default.
If there is no reason why you cannot use libc and libgloss by default, it is better to remove nostdlib option.
To compile your example try:
QUESTION
My goal is to emulate the ARM A9 processor as found on the Zynq-7000, running baremetal software. I have tried 2 different approaches to this and run into road blocks on both. Any suggestions on how to proceed would be appreciated.
Current answers on StackOverflow:which links to
Linux Kernel Module Cheat (LKMC, using v3.0)
built using ./build --arch arm qemu-baremetal
The examples on the site of using the ARM virtual machine (-virt flag) work fine. Trying to modify this to work with my setup is what's causing problems (details below).
I tried to copy the example command line invocation, but with the -cpu cortex-a9 option instead:
qemu-system-arm: mach-virt: CPU cortex-a9 not supported
Then I changed the whole invocation to be
qemu-system-arm -M xilinx-zynq-a9 -cpu cortex-a9 -nographic -kernel hello.elf -m 512M -serial mon:stdio -s -S
And it crashed with the error
qemu: fatal: Trying to execute code outside RAM or ROM at 0x40000000
Which makes sense, because the application was built with the LKMC, and I was trying to run it outside of that framework.
So then I tried running my own application, which was compiled using a modified version of the Xilinx toolchain. I'm sure it won't work right away, as there will be some parts of the bootup sequence that I have to change. But I'm trying to figure out what those are and change them.
Running with
qemu-system-arm -M xilinx-zynq-a9 -cpu cortex-a9 -nographic -kernel helloworld.elf -m 512M -serial mon:stdio -s -S
allows GDB to connect successfully, but it can't read the symbol table properly. Using
arm-none-eabi-objdump -D helloworld.elf
tells me that main is at 0x001004fc, but GDB thinks it's at 0x40000324 (using the command info address main).
The PYNQ-Z1 (webpage, datasheet) has a 32-bit ARM Cortex-A9 processor, so that's why I'm using qemu-system-arm instead of qemu-system-aarch64. Someone can correct me if that's wrong.
As a note, I cannot simply switch to a different architecture; the code that I am using cannot tolerate changes other than small tweaks to make the Board Support Package (BSP) compatible with the simulator, without harming the validity of my research.
What I have been going off of for a while now is
./run --arch arm -m 512M --baremetal pynq/helloworld --wait-gdb
./run-gdb --arch arm --baremetal pynq/helloworld --no-continue -- main
and I step through using GDB to find where there are data aborts and figure out what kind of hardware is not supported by Qemu.
The software that I am running is built using a modified Xilinx toolchain, and so includes many of the Xilinx standard library functions. In modifying the code to work with the virtual machine, I have discovered a few changes so far, such as changing the address of the UART device and disabling some boot-up tasks such as invalidating the SCU or changing the cache controller configuration, presumably because these things are not emulated by Qemu.
When debugging bootup, the next problem I have run into booting up is the XTime functions (xtime_l.c). These functions are wrappers around reading the global system timer. The results of the command info mtree in the Qemu interface seem to indicate that there is no global timer device with which to interact. Is there a way to add a timer device to the ARM virtual machine? It doesn't matter what the base address is, as long as it can be used in the same way as on the Zynq, using register reads and writes.
Then I tried to use the specific machine flag xilinx-zynq-a9. LKMC generates the following command:
ANSWER
Answered 2020-Feb-22 at 16:12- This is probably a non-trivial task than to add support for a timer
device to an existing QEMU machine. More specifically, this may not
be needed since a fair amount of them either support an ARM
architectural timer or a specific timer hardware.
In the specific case of the xilinx-zynq-a9, it seem theGlobal Timer Counterdescribed from page 1448 of the Zynq-7000 Technical Reference Manual is supported. - After having reading your post a couple of times, I reached the conclusion that a lot of things may go wrong with the set of tools you are using (KMC, toolchain, QEMU). I therefore created what I hope is a Minimal, Reproducible Example of a bare-metal application working with a QEMU xilinx-zynq-a9 machine using an arm toolchain I do trust, and the latest version of QEMU, 4.2.0, built from scratch using a script I wrote.
Please note that I adapted an existing personal project I already had available, and I know is working, for the purpose of answering your question.
Building QEMU: execute build-qemu.sh - this script works on 64 bits Ubuntu 18.04 and 19.10, you will have to set PERL_MODULES_VERSION to 5.28.
build-qemu.sh:
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