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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Example for using Helios DAC libraries in python (using C library with ctypes)
NB: If you haven't set up udev rules you need to use sudo to run the program for it to detect the DAC.
"""
import ctypes
#Define point structure
class HeliosPoint(ctypes.Structure):
#_pack_=1
_fields_ = [('x', ctypes.c_uint16),
('y', ctypes.c_uint16),
('r', ctypes.c_uint8),
('g', ctypes.c_uint8),
('b', ctypes.c_uint8),
('i', ctypes.c_uint8)]
#Load and initialize library
HeliosLib = ctypes.cdll.LoadLibrary("./libHeliosDacAPI.dylib")
numDevices = HeliosLib.OpenDevices()
#WriteFrame(unsigned int dacNum, int pps, std::uint8_t flags, HeliosPoint* points, int numOfPoints);
#in 1024 points:
#scale up x from 0 to 100%
#scale down y from 0 to 100%
#scale R, G and B up from 0 to 255 4 times out of sync
frames=[0 for x in range(1024)]
r=0
g=85
b=170
def inc8(m):
return (m+1)%256
for i in range(1024):
frames[i]=HeliosPoint(i*16,16383-(i*16),r,g,b,0)
r=inc8(r)
g=inc8(g)
b=inc8(b)
try:
while True:
HeliosLib.WriteFrame(0, 20000, 0, ctypes.pointer(frames[0]), 1024)
except KeyboardInterrupt:
pass
HeliosLib.CloseDevices()
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