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Fix bytearray TypeError Issue For Non-Express Boards #5

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Merged
merged 5 commits into from
Apr 6, 2018
Merged

Fix bytearray TypeError Issue For Non-Express Boards #5

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456b173
removed slicing for bytearray assignments; non-express boards don't i…
sommersoft Apr 4, 2018
50d46b8
fixed turn-off sequence; it was leaving led zero on
sommersoft Apr 4, 2018
bfe3264
adjusted _led_buffer to appropriate size
sommersoft Apr 4, 2018
6a10d24
revert previous turn-off fix; was caused by _led_buffer size
sommersoft Apr 4, 2018
69d4b17
range alignment
sommersoft Apr 5, 2018
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21 changes: 10 additions & 11 deletions adafruit_trellis.py
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Original file line number Diff line number Diff line change
Expand Up @@ -82,20 +82,20 @@ def __getitem__(self, x):
raise ValueError(('LED number must be between 0 -', self._parent._num_leds - 1))
led = ledLUT[x % 16] >> 4
mask = 1 << (ledLUT[x % 16] & 0x0f)
return bool(((self._parent._led_buffer[x // 16][led * 2] | \
self._parent._led_buffer[x // 16][(led * 2) + 1] << 8) & mask) > 0)
return bool(((self._parent._led_buffer[x // 16][(led * 2) + 1] | \
self._parent._led_buffer[x // 16][(led * 2) + 2] << 8) & mask) > 0)

def __setitem__(self, x, value):
if 0 < x >= self._parent._num_leds:
raise ValueError(('LED number must be between 0 -', self._parent._num_leds - 1))
led = ledLUT[x % 16] >> 4
mask = 1 << (ledLUT[x % 16] & 0x0f)
if value:
self._parent._led_buffer[x // 16][led * 2] |= mask
self._parent._led_buffer[x // 16][(led * 2) + 1] |= mask >> 8
self._parent._led_buffer[x // 16][(led * 2) + 1] |= mask
self._parent._led_buffer[x // 16][(led * 2) + 2] |= mask >> 8
elif not value:
self._parent._led_buffer[x // 16][led * 2] &= ~mask
self._parent._led_buffer[x // 16][(led * 2) + 1] &= ~mask >> 8
self._parent._led_buffer[x // 16][(led * 2) + 1] &= ~mask
self._parent._led_buffer[x // 16][(led * 2) + 2] &= ~mask >> 8
else:
raise ValueError("LED value must be True or False")

Expand All @@ -105,7 +105,7 @@ def __setitem__(self, x, value):
def fill(self, on):
fill = 0xff if on else 0x00
for buff in range(len(self._parent._i2c_devices)):
for i in range(16):
for i in range(1, 17):
self._parent._led_buffer[buff][i] = fill
if self._parent._auto_show:
self._parent.show()
Expand Down Expand Up @@ -136,7 +136,7 @@ def __init__(self, i2c, addresses=None):
self._buttons = []
for i2c_address in addresses:
self._i2c_devices.append(i2c_device.I2CDevice(i2c, i2c_address))
self._led_buffer.append(bytearray(16))
self._led_buffer.append(bytearray(17))
self._buttons.append([bytearray(6), bytearray(6)])
self._num_leds = len(self._i2c_devices) * 16
self._temp = bytearray(1)
Expand Down Expand Up @@ -196,10 +196,9 @@ def brightness(self, brightness):

def show(self):
"""Refresh the LED buffer and show the changes."""
temp_led_buffer = bytearray(self._num_leds + 1)
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Why did this have an extra byte? I see you shifted the indices above but I don't remember why.

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It's because the first byte when sending register info to the HT16K33 is the register location; in this case it should be 0x00 (the +1 in the buffer construct leaves the first byte untouched). Thanks for asking this question though, because it highlighted the fact that I forgot to change the array size of ._led_buffer to 17... Which was coincidentally causing the simpletest off-one-at-a-time problem. I really need to do better with curbing familiarity influencing methodical reviewing. 🤔

pos = 0
for device in self._i2c_devices:
temp_led_buffer[1:] = self._led_buffer[pos]
temp_led_buffer = bytearray(self._led_buffer[pos])
with device:
device.write(temp_led_buffer)
pos += 1
Expand All @@ -224,7 +223,7 @@ def read_buttons(self):
lists: 1 for new button presses, 1 for button relases.
"""
for i in range(len(self._buttons)):
self._buttons[i][0][:] = self._buttons[i][1][:]
self._buttons[i][0] = bytearray(self._buttons[i][1])
self._write_cmd(_HT16K33_KEY_READ_CMD)
pos = 0
for device in self._i2c_devices:
Expand Down