Zynq Ultrascale+ DisplayPort output

This notebook introduces using the DisplayPort output of the Zynq Ultrascale+ through PYNQ. By default we don't start X and instead provide a lower-level API to match the HDMI API we provide for the PYNQ-Z1 board.

To start with we import the video library which contains the DisplayPort class and supporting helper classes.



In [1]:

    
from pynq.lib.video import *

Next we create a DisplayPort object and configure it with the resolution and pixel format we would like.



In [2]:

    
displayport = DisplayPort()

displayport.configure(VideoMode(1280, 720, 24), PIXEL_RGB)

We can now test the output by setting the blue pixel of the frame in a loop and outputting the loop. From this we can see that the loop easily runs at 60 frames per second.



In [3]:

    
import time

start = time.time()

for i in range(600):
    frame = displayport.newframe()
    frame[:,:,0] = i % 256
    displayport.writeframe(frame)
    
end = time.time()
duration = end - start
print(f"Took {duration} seconds at {600 / duration} FPS")









    



Took 10.022847414016724 seconds at 59.863228004540275 FPS

It's far more exciting though to show an image from a webcam. We can do this using OpenCV. First we need to instantiate the VideoCapture device and set the resolution to match our frame.



In [4]:

    
import cv2

capture = cv2.VideoCapture(0)

capture.set(3, 1280)
capture.set(4, 720)









    Out[4]:





True

Then we can do a similar loop and record the framerate. This is slower due to the overhead in capturing frames from the camera.



In [5]:

    
start = time.time()

for _ in range(300):
    frame = displayport.newframe()
    capture.read(frame)
    displayport.writeframe(frame)
    
end = time.time()
duration = end - start
print(f"Took {duration} seconds at {300 / duration} FPS")









    



Took 27.602270126342773 seconds at 10.868671258806682 FPS

Finally we need to close the devices.



In [6]:

    
capture.release()
displayport.close()



In [ ]: