Gurkengewuerz/audio-reactive-led-strip
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Fix #20 ESP8266 can send multiple packets

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Previously there was no limit to the number of bytes that could be sent per packet. This commit enforces a limit on the amount of pixel information per packet.
This commit is contained in:
Scott Lawson 2017-01-30 07:11:07 -08:00 committed by GitHub
parent 5fe2f71bea
commit d6bf763c67
1 changed files with 21 additions and 17 deletions
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22
python/led.py
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@ -40,6 +40,7 @@ _prev_pixels = np.tile(253, (3, config.N_PIXELS))
pixels = np.tile(1, (3, config.N_PIXELS))
"""Pixel values for the LED strip"""
_is_python_2 = int(platform.python_version_tuple()[0]) == 2
def _update_esp8266():
"""Sends UDP packets to ESP8266 to update LED strip values
@ -62,20 +63,23 @@ def _update_esp8266():
# Optionally apply gamma correc tio
p = _gamma[pixels] if config.SOFTWARE_GAMMA_CORRECTION else np.copy(pixels)
# Send UDP packets when using ESP8266
is_python_2 = int(platform.python_version_tuple()[0]) == 2
m = '' if is_python_2 else []
for i in range(config.N_PIXELS):
# Ignore pixels if they haven't changed (saves bandwidth)
if np.array_equal(p[:, i], _prev_pixels[:, i]):
continue
if is_python_2:
m = '' if _is_python_2 else []
MAX_PIXELS_PER_PACKET = 126
# Pixel indices
idx = range(pixels.shape[1])
idx = [i for i in idx if not np.array_equal(p[:, i], _prev_pixels[:, i])]
n_packets = len(idx) // MAX_PIXELS_PER_PACKET + 1
idx = np.array_split(idx, n_packets)
for packet_indices in idx:
for i in packet_indices:
if _is_python_2:
m += chr(i) + chr(p[0][i]) + chr(p[1][i]) + chr(p[2][i])
else:
m.append(i) # Index of pixel to change
m.append(p[0][i]) # Pixel red value
m.append(p[1][i]) # Pixel green value
m.append(p[2][i]) # Pixel blue value
m = m if is_python_2 else bytes(m)
m = m if _is_python_2 else bytes(m)
_sock.sendto(m, (config.UDP_IP, config.UDP_PORT))
_prev_pixels = np.copy(p)
@ -158,4 +162,4 @@ if __name__ == '__main__':
while True:
pixels = np.roll(pixels, 1, axis=1)
update()
time.sleep(1)
time.sleep(.1)