PYNQ3.0.1 Overlay output always 0

[MS-chang]

• PYNQ version
  PYNQ3.0.1
• Board name
  PYNQ-ZI
• Tool Version
  Vitis HLS 2022.2
  Vivado 2022.2
• There is no wrong messages, but I got 0 output for every overlay that I generate. So there must be something wrong.
  jupyter

from pynq import Overlay
overlay=Overlay('./add_test.bit')
add_fun=overlay.add_0
add_fun.register_map
add_fun.register_map.a = 3
add_fun.register_map.b = 4
add_fun.register_map.c

the output is

Register(c=0)

with code

add_fun.write(0x10,4)
add_fun.write(0x18,4)
add_fun.read(0x20)

output is also 0

blockdesign

hls code is same as pynq toturial.

At first I think it is the version problem(PYNQv2.5 with Vitis 2022.2), but it still brothers me on PYNQ3.0

I’m new to ZYNQ and PYNQ. Is there any possible reason for the situation?

[marioruiz]

Hi @MS-chang,

Welcome to the PYNQ community.

Which tutorial are you referring to?

Mario

[MS-chang]

thanks for reply.
Overlay Tutorial — Python productivity for Zynq (Pynq)
the hls code is

void add(int a, int b, int& c) {
#pragma HLS INTERFACE ap_ctrl_none port=return
#pragma HLS INTERFACE s_axilite port=a
#pragma HLS INTERFACE s_axilite port=b
#pragma HLS INTERFACE s_axilite port=c

    c = a + b;
}

[marioruiz]

Can you please report the full add_fun.register_map?

[MS-chang]

[MS-chang]

OK I got the reason now. Do not use the boards-files for PYNQ-Z1 supported on Board Settings — Python productivity for Zynq (Pynq).
It is WRONG! just select the part xc7z020clg400-1 for PYNQ-Z1.

I’ve been back-stabbed by the official website document.
From here I got the clues: overlay_tutorial/ip/scalar_add/script.tcl at main · schelleg/overlay_tutorial (github.com).