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Add USB VCP example script.
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scripts/examples/02-Board-Control/usb_vcp.py
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36
scripts/examples/02-Board-Control/usb_vcp.py
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# USB VCP example.
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# This example shows how to use the USB VCP class to send an image to PC on demand.
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#
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# WARNING:
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# This script should NOT be run from the IDE or command line, it should be saved as main.py
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# Note the following commented script shows how to receive the image from the host side.
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#
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# #!/usr/bin/env python2.7
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# import sys, serial, struct
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# port = '/dev/ttyACM0'
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# sp = serial.Serial(port, baudrate=115200, bytesize=serial.EIGHTBITS, parity=serial.PARITY_NONE,
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# xonxoff=False, rtscts=False, stopbits=serial.STOPBITS_ONE, timeout=None, dsrdtr=True)
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# sp.write("snap")
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# sp.flush()
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# size = struct.unpack('<L', sp.read(4))[0]
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# img = sp.read(size)
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# sp.close()
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#
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# with open("img.jpg", "w") as f:
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# f.write(img)
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import sensor, image, time, ustruct
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from pyb import USB_VCP
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usb = USB_VCP()
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sensor.reset() # Reset and initialize the sensor.
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sensor.set_pixformat(sensor.RGB565) # Set pixel format to RGB565 (or GRAYSCALE)
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sensor.set_framesize(sensor.QVGA) # Set frame size to QVGA (320x240)
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sensor.skip_frames(time = 2000) # Wait for settings take effect.
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while(True):
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cmd = usb.recv(4, timeout=5000)
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if (cmd == b'snap'):
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img = sensor.snapshot().compress()
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usb.send(ustruct.pack("<L", img.size()))
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usb.send(img)
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