I have just recently been testing TLC59711 on my nVidia Xavier NX dev board (might be worth mentioning that all other circuitpython libraries work fine on it).
Anyway when I tried to run the example code after setting everything up I have encountered a following error:
It seems that the defined variables with const values are out of scope for the functions below, simply moving the definitions above the class definition fixed the error and I was able to successfully test the board.
# SPDX-FileCopyrightText: 2017 Tony DiCola for Adafruit Industries
# SPDX-FileCopyrightText: 2018 Stefan Krüger s-light.eu
#
# SPDX-License-Identifier: MIT
"""
`adafruit_tlc59711`
====================================================
CircuitPython module for the
TLC59711 or TLC5971 16-bit 12 channel LED PWM driver.
See examples/tlc59711_simpletest.py for a demo of the usage.
* Author(s): Tony DiCola, Stefan Kruger
Implementation Notes
--------------------
**Hardware:**
* Adafruit `12-Channel 16-bit PWM LED Driver - SPI Interface - TLC59711
<https://www.adafruit.com/product/1455>`_ (Product ID: 1455)
or TLC5971
**Software and Dependencies:**
* The API is mostly compatible to the DotStar / NeoPixel Libraries
and is therefore also compatible with FancyLED.
* Adafruit CircuitPython firmware for the supported boards:
https://circuitpython.org/downloads
"""
__version__ = "0.0.0-auto.0"
__repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_TLC59711.git"
# pylint - globally disable
# 'invalid-name' check to allow for datasheet conform short channel and register names.
# pylint: disable=invalid-name
# 'undefined-variable' to allow for micropython const definitions
# pylint: disable=undefined-variable
# 'too-many-lines' with the extra class and the api backwards compatibel things i have ~1100 lines..
# and as it was wished to not alter the .pylint file to limit to 1100 i disable it here..
# and yes - this code is very detailed commented. but i think that this is a good thing -
# as hopefully this way it is easier to understand desicions &
# what is going on and learn the backgrounds..
# pylint: disable=too-many-lines
import struct
from micropython import const
# Workaround for the undefined name error
_CHIP_BUFFER_BYTE_COUNT = const(28)
COLORS_PER_PIXEL = const(3)
PIXEL_PER_CHIP = const(4)
CHANNEL_PER_CHIP = const(COLORS_PER_PIXEL * PIXEL_PER_CHIP)
_BUFFER_BYTES_PER_COLOR = const(2)
_BUFFER_BYTES_PER_PIXEL = const(_BUFFER_BYTES_PER_COLOR * COLORS_PER_PIXEL)
_BC_CHIP_BUFFER_BIT_OFFSET = const(0)
_BC_BIT_COUNT = const(3 * 7)
_FC_CHIP_BUFFER_BIT_OFFSET = const(_BC_BIT_COUNT)
_FC_BIT_COUNT = const(5)
_WC_CHIP_BUFFER_BIT_OFFSET = const(_FC_BIT_COUNT + _BC_BIT_COUNT)
_WC_BIT_COUNT = const(6)
_CHIP_BUFFER_HEADER_BIT_COUNT = const(_WC_BIT_COUNT + _FC_BIT_COUNT + _BC_BIT_COUNT)
_CHIP_BUFFER_HEADER_BYTE_COUNT = const(_CHIP_BUFFER_HEADER_BIT_COUNT // 8)
class TLC59711:
"""TLC5971 & TLC59711 16-bit 12 channel LED PWM driver.
The TLC59711 & TLC5971 chip is designed to drive 4 RGB LEDs with 16-bit PWM per Color.
This Library can control 1..many chips.
The class has an interface compatible with the FancyLED library -
and the API is similar to the NeoPixel and DotStar Interfaces.
:param ~busio.SPI spi: An instance of the SPI bus connected to the chip.
The clock and MOSI/outout must be set, the MISO/input is unused.
Maximal data clock frequence is:
- TLC59711: 10MHz
- TLC5971: 20MHz
:param bool pixel_count: Number of RGB-LEDs (=Pixels) that are connected. (default=4)
"""
# pylint: disable=too-many-instance-attributes
# it just does make senes to have the chip params as attributes.
# """
# TLC5971 data / register structure
#
# some detailed information on the protocol based on
# http://www.ti.com/lit/ds/symlink/tlc5971.pdf
# 8.5.4 Register and Data Latch Configuration (page 23ff)
# 9.2.2.3 How to Control the TLC5971 (page27)
#
# How to send:
# the first data we send are received by the last device in chain.
# Device Nth (244Bit = 28Byte)
# Write Command (6Bit)
# WRCMD (fixed: 25h)
# Function Control Data (5 x 1Bit = 5Bit)
# OUTTMG 1bit
# GS clock edge select
# 1=rising edge, 0= falling edge
# EXTGCK 1bit
# GS reference clock select
# 1=SCKI clock, 0=internal oscillator
# TMGRST 1bit
# display timing reset mode
# 1=OUT forced of on latchpulse, 0=no forced reset
# DSPRPT 1bit
# display repeat mode
# 1=auto repeate
# 0=Out only turned on after Blank or internal latchpulse
# BLANK 1bit;
# 1=blank (outputs off)
# 0=Out on - controlled by GS-Data
# ic power on sets this to 1
# BC-Data (3 x 7Bits = 21Bit)
# BCB 7bit;
# BCG 7bit;
# BCR 7bit;
# GS-Data (12 x 16Bits = 192Bit)
# GSB3 16bit;
# GSG3 16bit;
# GSR3 16bit;
# GSB2 16bit;
# GSG2 16bit;
# GSR2 16bit;
# GSB1 16bit;
# GSG1 16bit;
# GSR1 16bit;
# GSB0 16bit;
# GSG0 16bit;
# GSR0 16bit;
# Device Nth-1 (244Bit = 28Byte)
# Device ..
# Device 2
# Device 1
# short break of 8x period of clock (666ns .. 2.74ms)
# to generate latchpulse
# + 1.34uS
# than next update.
# """
##########################################
# helper
##########################################
# pylama:ignore=E0602
# ugly workaround for pylama not knowing of micropython const thing
_CHIP_BUFFER_BYTE_COUNT = const(28)
COLORS_PER_PIXEL = const(3)
PIXEL_PER_CHIP = const(4)
CHANNEL_PER_CHIP = const(COLORS_PER_PIXEL * PIXEL_PER_CHIP)
_BUFFER_BYTES_PER_COLOR = const(2)
_BUFFER_BYTES_PER_PIXEL = const(_BUFFER_BYTES_PER_COLOR * COLORS_PER_PIXEL)
# @staticmethod
# def set_bit_with_mask(v, mask, x):
# """Set bit with help of mask."""
# # clear
# v &= ~mask
# if x:
# # set
# v |= mask
# return v
#
# @staticmethod
# def set_bit(v, index, x):
# """Set bit - return new value.
#
# Set the index:th bit of v to 1 if x is truthy,
# else to 0, and return the new value.
# https://stackoverflow.com/a/12174051/574981
# """
# # Compute mask, an integer with just bit 'index' set.
# mask = 1 << index
# # Clear the bit indicated by the mask (if x is False)
# v &= ~mask
# if x:
# # If x was True, set the bit indicated by the mask.
# v |= mask
# # Return the result, we're done.
# return v
##########################################
# class _BC():
# BC-Data (3 x 7Bits = 21Bit).
#
# BCB 7bit;
# BCG 7bit;
# BCR 7bit;
_BC_CHIP_BUFFER_BIT_OFFSET = const(0)
_BC_BIT_COUNT = const(3 * 7)
# this holds the chip offset and
_BC_FIELDS = {
"BCR": {
"offset": 0,
"length": 7,
"mask": 0b01111111,
},
"BCG": {
"offset": 7,
"length": 7,
"mask": 0b01111111,
},
"BCB": {
"offset": 14,
"length": 7,
"mask": 0b01111111,
},
}
##########################################
# class _FC():
# """
# Function Control Data (5 x 1Bit = 5Bit).
#
# OUTTMG 1bit
# GS clock edge select
# 1 = rising edge
# 0 = falling edge
# EXTGCK 1bit
# GS reference clock select
# 1 = SCKI clock
# 0 = internal oscillator
# TMGRST 1bit
# display timing reset mode
# 1 = OUT forced of on latchpulse
# 0 = no forced reset
# DSPRPT 1bit
# display repeat mode
# 1 = auto repeate
# 0 = Out only turned on after Blank or internal latchpulse
# BLANK 1bit;
# ic power on sets this to 1
# 1 = blank (outputs off)
# 0 = Out on - controlled by GS-Data
# """
_FC_CHIP_BUFFER_BIT_OFFSET = const(_BC_BIT_COUNT)
_FC_BIT_COUNT = const(5)
_FC_FIELDS = {
"BLANK": {
"offset": 0,
"length": 1,
"mask": 0b1,
},
"DSPRPT": {
"offset": 1,
"length": 1,
"mask": 0b1,
},
"TMGRST": {
"offset": 2,
"length": 1,
"mask": 0b1,
},
"EXTGCK": {
"offset": 3,
"length": 1,
"mask": 0b1,
},
"OUTTMG": {
"offset": 4,
"length": 1,
"mask": 0b1,
},
}
##########################################
# class _WRITE_COMMAND():
# """WRITE_COMMAND."""
_WC_CHIP_BUFFER_BIT_OFFSET = const(_FC_BIT_COUNT + _BC_BIT_COUNT)
_WC_BIT_COUNT = const(6)
_WC_FIELDS = {
"WRITE_COMMAND": {
"offset": 0,
"length": 6,
"mask": 0b111111,
},
}
WRITE_COMMAND = const(0b100101)
##########################################
########
_CHIP_BUFFER_HEADER_BIT_COUNT = const(_WC_BIT_COUNT + _FC_BIT_COUNT + _BC_BIT_COUNT)
_CHIP_BUFFER_HEADER_BYTE_COUNT = const(_CHIP_BUFFER_HEADER_BIT_COUNT // 8)
##########################################
def __init__(self, spi, *, pixel_count=4):
"""Init."""
self._spi = spi
self.pixel_count = pixel_count
self.channel_count = self.pixel_count * self.COLORS_PER_PIXEL
# calculate how many chips are connected
self.chip_count = self.pixel_count // 4
# The chips are just a big 28 byte long shift register without any fancy update protocol.
# Blast out all the bits to update, that's it! → create raw output data
self._buffer = bytearray(_CHIP_BUFFER_BYTE_COUNT * self.chip_count)
# Initialize the brightness channel values to max (these are 7-bit values).
self.bcr = 127
self.bcg = 127
self.bcb = 127
# Initialize external user-facing state for the function control bits of the chip.
# These aren't commonly used but available and match the nomenclature from the datasheet.
# you must manually call update_fc() after changing them
# (reduces the need to make frivolous memory-hogging properties).
# Default set: OUTTMG, TMGRST, and DSPRPT to on; like in Arduino library.
# these are set for all chips the same
self.outtmg = True
self.extgck = False
self.tmgrst = True
self.dsprpt = True
self.blank = False
# preparation done → now initialize buffer to default values
self._init_buffer()
self._buffer_index_lookuptable = []
self._init_lookuptable()
def _init_buffer(self):
for chip_index in range(self.chip_count):
# set Write Command (6Bit) WRCMD (fixed: 25h)
self.chip_set_BCData(chip_index, bcr=self.bcr, bcg=self.bcg, bcb=self.bcb)
self._chip_set_FunctionControl(chip_index)
self._chip_set_WriteCommand(chip_index)
def set_chipheader_bits_in_buffer(
self, *, chip_index=0, part_bit_offset=0, field=None, value=0
):
"""Set chip header bits in buffer."""
if field is None:
field = {"mask": 0, "length": 0, "offset": 0}
offset = part_bit_offset + field["offset"]
# restrict value
value &= field["mask"]
# move value to position
value = value << offset
# calculate header start
header_start = chip_index * _CHIP_BUFFER_BYTE_COUNT
# get chip header
header = struct.unpack_from(">I", self._buffer, header_start)[0]
# 0xFFFFFFFF == 0b11111111111111111111111111111111
# create/move mask
mask = field["mask"] << offset
# clear
header &= ~mask
# set
header |= value
# write header back
struct.pack_into(">I", self._buffer, header_start, header)
##########################################
def chip_set_BCData(self, chip_index, bcr=127, bcg=127, bcb=127):
"""
Set BC-Data.
:param int chip_index: Index of Chip to set.
:param int bcr: 7-bit value from 0-127 (default=127)
:param int bcg: 7-bit value from 0-127 (default=127)
:param int bcb: 7-bit value from 0-127 (default=127)
"""
# set all bits
self.set_chipheader_bits_in_buffer(
chip_index=chip_index,
part_bit_offset=_BC_CHIP_BUFFER_BIT_OFFSET,
field=self._BC_FIELDS["BCR"],
value=bcr,
)
self.set_chipheader_bits_in_buffer(
chip_index=chip_index,
part_bit_offset=_BC_CHIP_BUFFER_BIT_OFFSET,
field=self._BC_FIELDS["BCG"],
value=bcg,
)
self.set_chipheader_bits_in_buffer(
chip_index=chip_index,
part_bit_offset=_BC_CHIP_BUFFER_BIT_OFFSET,
field=self._BC_FIELDS["BCB"],
value=bcb,
)
def update_BCData(self):
"""
Update BC-Data for all Chips in Buffer.
need to be called after you changed on of the BC-Data Parameters. (bcr, bcg, bcb)
"""
for chip_index in range(self.chip_count):
self.chip_set_BCData(chip_index, bcr=self.bcr, bcg=self.bcg, bcb=self.bcb)
def _chip_set_FunctionControl(self, chip_index):
"""
Set Function Control Bits in Buffer.
values from object global parameters are used.
:param int chip_index: Index of Chip to set.
"""
# set all bits
self.set_chipheader_bits_in_buffer(
chip_index=chip_index,
part_bit_offset=_FC_CHIP_BUFFER_BIT_OFFSET,
field=self._FC_FIELDS["OUTTMG"],
value=self.outtmg,
)
self.set_chipheader_bits_in_buffer(
chip_index=chip_index,
part_bit_offset=_FC_CHIP_BUFFER_BIT_OFFSET,
field=self._FC_FIELDS["EXTGCK"],
value=self.extgck,
)
self.set_chipheader_bits_in_buffer(
chip_index=chip_index,
part_bit_offset=_FC_CHIP_BUFFER_BIT_OFFSET,
field=self._FC_FIELDS["TMGRST"],
value=self.tmgrst,
)
self.set_chipheader_bits_in_buffer(
chip_index=chip_index,
part_bit_offset=_FC_CHIP_BUFFER_BIT_OFFSET,
field=self._FC_FIELDS["DSPRPT"],
value=self.dsprpt,
)
self.set_chipheader_bits_in_buffer(
chip_index=chip_index,
part_bit_offset=_FC_CHIP_BUFFER_BIT_OFFSET,
field=self._FC_FIELDS["BLANK"],
value=self.blank,
)
def update_fc(self):
"""
Update Function Control Bits for all Chips in Buffer.
need to be called after you changed on of the Function Control Bit Parameters.
(outtmg, extgck, tmgrst, dsprpt, blank)
"""
for chip_index in range(self.chip_count):
self._chip_set_FunctionControl(chip_index)
def _chip_set_WriteCommand(self, chip_index):
"""Set WRITE_COMMAND."""
# set all bits
self.set_chipheader_bits_in_buffer(
chip_index=chip_index,
part_bit_offset=_WC_CHIP_BUFFER_BIT_OFFSET,
field=self._WC_FIELDS["WRITE_COMMAND"],
value=self.WRITE_COMMAND,
)
def _init_lookuptable(self):
for channel_index in range(self.channel_count):
buffer_index = (_CHIP_BUFFER_BYTE_COUNT // _BUFFER_BYTES_PER_COLOR) * (
channel_index // self.CHANNEL_PER_CHIP
) + channel_index % self.CHANNEL_PER_CHIP
buffer_index *= _BUFFER_BYTES_PER_COLOR
buffer_index += _CHIP_BUFFER_HEADER_BYTE_COUNT
self._buffer_index_lookuptable.append(buffer_index)
##########################################
def _write(self):
# Write out the current state to the shift register.
try:
# Lock the SPI bus and configure it for the shift register.
while not self._spi.try_lock():
pass
self._spi.configure(baudrate=self._spi.frequency, polarity=0, phase=0)
self._spi.write(self._buffer)
finally:
# Ensure the SPI bus is unlocked.
self._spi.unlock()
def show(self):
"""Write out the current LED PWM state to the chip."""
self._write()
##########################################
@staticmethod
def calculate_Ioclmax(*, Riref=2.48):
"""
Calculate Maximum Constant Sink Current Value.
see:
8.4.1 Maximum Constant Sink Current Setting
http://www.ti.com/lit/ds/symlink/tlc5971.pdf#page=18&zoom=160,0,524
Riref = (Viref / Ioclmax) * 41
Ioclmax = (41 / Riref) * Viref
:param float Riref: resistor value (kΩ) (default=20)
:return tuple: Ioclmax (mA)
"""
# Riref = (Viref / Ioclmax) * 41 | / 41
# Riref / 41 = Viref / Ioclmax | switch
# 41 / Riref = Ioclmax / Viref | * Viref
# (41 / Riref) * Viref = Ioclmax
if not 0.8 <= Riref <= 24.8:
raise ValueError("Riref {} not in range: 0.8kΩ..25kΩ".format(Riref))
Viref = 1.21
Ioclmax = (41 / Riref) * Viref
if not 2.0 <= Ioclmax <= 60.0:
raise ValueError("Ioclmax {} not in range: 2mA..60mA".format(Ioclmax))
return Ioclmax
@staticmethod
def calculate_Riref(*, Ioclmax=20):
"""
Calculate Maximum Constant Sink Current Value.
see:
8.4.1 Maximum Constant Sink Current Setting
http://www.ti.com/lit/ds/symlink/tlc5971.pdf#page=19&zoom=200,0,697
Riref = (Viref / Ioclmax) * 41
:param float Ioclmax: target max output current (mA) (default=20)
:return tuple: Riref (kΩ)
"""
if not 2.0 <= Ioclmax <= 60.0:
raise ValueError("Ioclmax {} not in range: 2mA..60mA".format(Ioclmax))
Viref = 1.21
Riref = (Viref / Ioclmax) * 41
if not 0.8 <= Riref <= 24.8:
raise ValueError("Riref {} not in range: 0.8kΩ..25kΩ".format(Riref))
return Riref
@staticmethod
def calculate_BCData(*, Ioclmax=18, IoutR=17, IoutG=15, IoutB=9):
"""
Calculate Global Brightness Control Values.
see:
8.5.1 Global Brightness Control (BC) Function (Sink Current Control)
http://www.ti.com/lit/ds/symlink/tlc5971.pdf#page=19&zoom=200,0,697
Iout = Ioclmax * (BCX / 127)
BCX = Iout / Ioclmax * 127
:param float Ioclmax: max output current set by Riref (mA) (default=20)
:param float IoutR: max output current for red color group (mA)
(default=9)
:param float IoutG: max output current for green color (mA)
(default=15)
:param float IoutB: max output current for blue color (mA)
(default=17)
:return tuple: (bcr, bcg, bcb)
"""
# Iout = Ioclmax * (BCX / 127) | / Ioclmax
# Iout / Ioclmax = BCX / 127 | * 127
# Iout / Ioclmax * 127 = BCX
if not 2.0 <= Ioclmax <= 60.0:
raise ValueError("Ioclmax {} not in range: 2mA..60mA" "".format(Ioclmax))
if not 0.0 <= IoutR <= Ioclmax:
raise ValueError("IoutR {} not in range: 2mA..{}mA".format(IoutR, Ioclmax))
if not 0.0 <= IoutG <= Ioclmax:
raise ValueError("IoutG {} not in range: 2mA..{}mA".format(IoutG, Ioclmax))
if not 0.0 <= IoutB <= Ioclmax:
raise ValueError("IoutB {} not in range: 2mA..{}mA".format(IoutB, Ioclmax))
bcr = int((IoutR / Ioclmax) * 127)
bcg = int((IoutG / Ioclmax) * 127)
bcb = int((IoutB / Ioclmax) * 127)
if not 0 <= bcr <= 127:
raise ValueError("bcr {} not in range: 0..127".format(bcr))
if not 0 <= bcg <= 127:
raise ValueError("bcg {} not in range: 0..127".format(bcg))
if not 0 <= bcb <= 127:
raise ValueError("bcb {} not in range: 0..127".format(bcb))
return (bcr, bcg, bcb)
##########################################
@staticmethod
def _convert_01_float_to_16bit_integer(value):
"""Convert 0..1 Float Value to 16bit (0..65535) Range."""
# check if value is in range
if not 0.0 <= value[0] <= 1.0:
raise ValueError("value[0] {} not in range: 0..1".format(value[0]))
# convert to 16bit value
return int(value * 65535)
@classmethod
def _convert_if_float(cls, value):
"""Convert if value is Float."""
if isinstance(value, float):
value = cls._convert_01_float_to_16bit_integer(value)
return value
@staticmethod
def _check_and_convert(value):
# loop
# mega slow
# for i, val in enumerate(value):
# # check if we have float values
# if isinstance(val, float):
# # check if val is in range
# if not 0.0 <= val <= 1.0:
# raise ValueError(
# "value[{}] {} not in range: 0..1".format(i, val))
# # convert to 16bit val
# value[i] = int(val * 65535)
# else:
# if not 0 <= val <= 65535:
# raise ValueError(
# "value[{}] {} not in range: 0..65535".format(i, val))
# discreet is way faster
# (compared with tlc59711_multi_dev.py: pixels.set_all_black())
# check if we have float values
if isinstance(value[0], float):
# check if value is in range
if not 0.0 <= value[0] <= 1.0:
raise ValueError("value[0] {} not in range: 0..1".format(value[0]))
# convert to 16bit value
value[0] = int(value[0] * 65535)
else:
if not 0 <= value[0] <= 65535:
raise ValueError("value[0] {} not in range: 0..65535".format(value[0]))
if isinstance(value[1], float):
if not 0.0 <= value[1] <= 1.0:
raise ValueError("value[1] {} not in range: 0..1".format(value[1]))
value[1] = int(value[1] * 65535)
else:
if not 0 <= value[1] <= 65535:
raise ValueError("value[1] {} not in range: 0..65535".format(value[1]))
if isinstance(value[2], float):
if not 0.0 <= value[2] <= 1.0:
raise ValueError("value[2] {} not in range: 0..1".format(value[2]))
value[2] = int(value[2] * 65535)
else:
if not 0 <= value[2] <= 65535:
raise ValueError("value[2] {} not in range: 0..65535".format(value[2]))
##########################################
def _get_channel_16bit_value(self, channel_index):
buffer_start = self._buffer_index_lookuptable[channel_index]
return struct.unpack_from(">H", self._buffer, buffer_start)[0]
def set_pixel_16bit_value(self, pixel_index, value_r, value_g, value_b):
"""
Set the value for pixel.
This is a Fast UNPROTECTED function:
no error / range checking is done.
:param int pixel_index: 0..(pixel_count)
:param int value_r: 0..65535
:param int value_g: 0..65535
:param int value_b: 0..65535
"""
# optimized for speed.
# the struct version leads to very slow runtime behaivor if you set
# lots of pixels. that is the reason the discreet version is used.
# you can check with the tlc59711_multi_dev.py file.
# most prominent this is visible at the set_pixel_all_16bit_value func:
# struct 157ms to 16ms (@144pixel on ItsyBitsy M4)
pixel_start = pixel_index * self.COLORS_PER_PIXEL
buffer_start = self._buffer_index_lookuptable[pixel_start + 0]
# struct.pack_into('>H', self._buffer, buffer_start, value_b)
self._buffer[buffer_start + 0] = (value_b >> 8) & 0xFF
self._buffer[buffer_start + 1] = value_b & 0xFF
buffer_start = self._buffer_index_lookuptable[pixel_start + 1]
# struct.pack_into('>H', self._buffer, buffer_start, value_g)
self._buffer[buffer_start + 0] = (value_g >> 8) & 0xFF
self._buffer[buffer_start + 1] = value_g & 0xFF
buffer_start = self._buffer_index_lookuptable[pixel_start + 2]
# struct.pack_into('>H', self._buffer, buffer_start, value_r)
self._buffer[buffer_start + 0] = (value_r >> 8) & 0xFF
self._buffer[buffer_start + 1] = value_r & 0xFF
def set_pixel_float_value(self, pixel_index, value_r, value_g, value_b):
"""
Set the value for pixel.
This is a Fast UNPROTECTED function:
no error / range checking is done.
:param int pixel_index: 0..(pixel_count)
:param int value_r: 0..1
:param int value_g: 0..1
:param int value_b: 0..1
"""
# self.set_pixel_16bit_value(
# pixel_index,
# int(value_r * 65535),
# int(value_g * 65535),
# int(value_b * 65535)
# )
# this is again a speed optimized version:
# this cuts down from 228ms to 22ms (@144pixel on ItsyBitsy M4)
value_r = int(value_r * 65535)
value_g = int(value_g * 65535)
value_b = int(value_b * 65535)
pixel_start = pixel_index * self.COLORS_PER_PIXEL
buffer_start = self._buffer_index_lookuptable[pixel_start + 0]
self._buffer[buffer_start + 0] = (value_b >> 8) & 0xFF
self._buffer[buffer_start + 1] = value_b & 0xFF
buffer_start = self._buffer_index_lookuptable[pixel_start + 1]
self._buffer[buffer_start + 0] = (value_g >> 8) & 0xFF
self._buffer[buffer_start + 1] = value_g & 0xFF
buffer_start = self._buffer_index_lookuptable[pixel_start + 2]
self._buffer[buffer_start + 0] = (value_r >> 8) & 0xFF
self._buffer[buffer_start + 1] = value_r & 0xFF
def set_pixel_16bit_color(self, pixel_index, color):
"""
Set color for pixel.
This is a Fast UNPROTECTED function:
no error / range checking is done.
its a little bit slower as `set_pixel_16bit_value`
:param int pixel_index: 0..(pixel_count)
:param int color: 3-tuple of R, G, B; 0..65535
"""
# self.set_pixel_16bit_value(
# pixel_index,
# color[0],
# color[1],
# color[2]
# )
# speed optimization: 140ms to 24ms (@144pixel on ItsyBitsy M4)
# the `color = list(color)` is the key here! (don't ask me why..)
color = list(color)
pixel_start = pixel_index * self.COLORS_PER_PIXEL
buffer_start = self._buffer_index_lookuptable[pixel_start + 0]
self._buffer[buffer_start + 0] = (color[2] >> 8) & 0xFF
self._buffer[buffer_start + 1] = color[2] & 0xFF
buffer_start = self._buffer_index_lookuptable[pixel_start + 1]
self._buffer[buffer_start + 0] = (color[1] >> 8) & 0xFF
self._buffer[buffer_start + 1] = color[1] & 0xFF
buffer_start = self._buffer_index_lookuptable[pixel_start + 2]
self._buffer[buffer_start + 0] = (color[0] >> 8) & 0xFF
self._buffer[buffer_start + 1] = color[0] & 0xFF
def set_pixel_float_color(self, pixel_index, color):
"""
Set color for pixel.
This is a Fast UNPROTECTED function:
no error / range checking is done.
its a little bit slower as `set_pixel_16bit_value`
:param int pixel_index: 0..(pixel_count)
:param tuple/float color: 3-tuple of R, G, B; 0..1
"""
# self.set_pixel_16bit_value(
# pixel_index,
# int(color[0] * 65535),
# int(color[1] * 65535),
# int(color[2] * 65535)
# )
# speed optimization: 140ms to 30ms (@144pixel on ItsyBitsy M4)
color = list(color)
color[0] = int(color[0] * 65535)
color[1] = int(color[1] * 65535)
color[2] = int(color[2] * 65535)
pixel_start = pixel_index * self.COLORS_PER_PIXEL
buffer_start = self._buffer_index_lookuptable[pixel_start + 0]
self._buffer[buffer_start + 0] = (color[2] >> 8) & 0xFF
self._buffer[buffer_start + 1] = color[2] & 0xFF
buffer_start = self._buffer_index_lookuptable[pixel_start + 1]
self._buffer[buffer_start + 0] = (color[1] >> 8) & 0xFF
self._buffer[buffer_start + 1] = color[1] & 0xFF
buffer_start = self._buffer_index_lookuptable[pixel_start + 2]
self._buffer[buffer_start + 0] = (color[0] >> 8) & 0xFF
self._buffer[buffer_start + 1] = color[0] & 0xFF
def set_pixel(self, pixel_index, value):
"""
Set the R, G, B values for the pixel.
this funciton hase some advanced error checking.
it is much slower than the other provided 'bare' variants..
but therefor gives clues to what is going wrong.. ;-)
:param int pixel_index: 0..(pixel_count)
:param tuple value: 3-tuple of R, G, B;
each int 0..65535 or float 0..1
"""
if 0 <= pixel_index < self.pixel_count:
# convert to list
value = list(value)
# repr(value)
if len(value) != self.COLORS_PER_PIXEL:
raise IndexError(
"length of value {} does not match COLORS_PER_PIXEL (= {})"
"".format(len(value), self.COLORS_PER_PIXEL)
)
# tested:
# splitting up into variables to not need the list..
# this is about 0.25ms slower..
# value_r = value[0]
# value_g = value[1]
# value_b = value[2]
# check if we have float values
# this modifies 'value' in place..
self._check_and_convert(value)
# update buffer
# we change channel order here:
# buffer channel order is blue, green, red
# pixel_start = pixel_index * self.COLORS_PER_PIXEL
# buffer_start = self._buffer_index_lookuptable[pixel_start + 0]
# self._buffer[buffer_start + 0] = (value[2] >> 8) & 0xFF
# self._buffer[buffer_start + 1] = value[2] & 0xFF
# buffer_start = self._buffer_index_lookuptable[pixel_start + 1]
# self._buffer[buffer_start + 0] = (value[1] >> 8) & 0xFF
# self._buffer[buffer_start + 1] = value[1] & 0xFF
# buffer_start = self._buffer_index_lookuptable[pixel_start + 2]
# self._buffer[buffer_start + 0] = (value[0] >> 8) & 0xFF
# self._buffer[buffer_start + 1] = value[0] & 0xFF
# simpliefy code
self.set_pixel_16bit_value(pixel_index, value[0], value[1], value[2])
else:
raise IndexError(
"index {} out of range [0..{}]" "".format(pixel_index, self.pixel_count)
)
def set_pixel_all_16bit_value(self, value_r, value_g, value_b):
"""
Set the R, G, B values for all pixels.
fast. without error checking.
:param int value_r: 0..65535
:param int value_g: 0..65535
:param int value_b: 0..65535
"""
for i in range(self.pixel_count):
self.set_pixel_16bit_value(i, value_r, value_g, value_b)
def set_pixel_all(self, color):
"""
Set the R, G, B values for all pixels.
:param tuple 3-tuple of R, G, B; each int 0..65535 or float 0..1
"""
for i in range(self.pixel_count):
self.set_pixel(i, color)
def set_all_black(self):
"""Set all pixels to black."""
for i in range(self.pixel_count):
self.set_pixel_16bit_value(i, 0, 0, 0)
# channel access
def set_channel(self, channel_index, value):
"""
Set the value for the provided channel.
:param int channel_index: 0..channel_count
:param int value: 0..65535
"""
if 0 <= channel_index < (self.channel_count):
# check if values are in range
if not 0 <= value <= 65535:
raise ValueError("value {} not in range: 0..65535")
# temp = channel_index
# we change channel order here:
# buffer channel order is blue, green, red
pixel_index_offset = channel_index % self.COLORS_PER_PIXEL
if pixel_index_offset == 0:
channel_index += 2
elif pixel_index_offset == 2:
channel_index -= 2
# set value in buffer
buffer_start = self._buffer_index_lookuptable[channel_index]
struct.pack_into(">H", self._buffer, buffer_start, value)
else:
raise IndexError(
"channel_index {} out of range (0..{})".format(
channel_index, self.channel_count
)
)
# Define index and length properties to set and get each pixel as
# atomic RGB tuples. This provides a similar feel as using neopixels.
def __len__(self):
"""Retrieve TLC5975 the total number of Pixels available."""
return self.pixel_count
def __getitem__(self, key):
"""
Retrieve the R, G, B values for the provided channel as a 3-tuple.
Each value is a 16-bit number from 0-65535.
"""
if 0 <= key < self.pixel_count:
pixel_start = key * self.COLORS_PER_PIXEL
return (
self._get_channel_16bit_value(pixel_start + 0),
self._get_channel_16bit_value(pixel_start + 1),
self._get_channel_16bit_value(pixel_start + 2),
)
# else:
raise IndexError("index {} out of range [0..{}]".format(key, self.pixel_count))
def __setitem__(self, key, value):
"""
Set the R, G, B values for the pixel.
this funciton hase some advanced error checking.
it is much slower than the other provided 'bare' variants..
but therefor gives clues to what is going wrong.. ;-)
this shortcut is identicall to `set_pixel`
:param int key: 0..(pixel_count)
:param tuple 3-tuple of R, G, B; each int 0..65535 or float 0..1
"""
# for a more detailed version with all the debugging code and
# comments look at set_pixel
if 0 <= key < self.pixel_count:
value = list(value)
if len(value) != self.COLORS_PER_PIXEL:
raise IndexError(
"length of value {} does not match COLORS_PER_PIXEL (= {})"
"".format(len(value), self.COLORS_PER_PIXEL)
)
# _check_and_convert modifies value in place..
self._check_and_convert(value)
self.set_pixel_16bit_value(key, value[0], value[1], value[2])
else:
raise IndexError(
"index {} out of range [0..{}]" "".format(key, self.pixel_count)
)
class _ChannelDirekt:
# Internal decorator to simplify mapping.
def __init__(self, channel):
self._channel = channel
def __get__(self, obj, obj_type):
# Grab the 16-bit value at the offset for this channel.
return obj._get_channel_16bit_value(self._channel)
def __set__(self, obj, value):
# Set the 16-bit value at the offset for this channel.
assert 0 <= value <= 65535
obj.set_channel(self._channel, value)
# if obj.auto_show:
# obj._write()
# Define explicit channels for first IC.
# → this is only for api backwards compliance.
# not recommended for new use - use *set_channel*
b0 = _ChannelDirekt(0)
g0 = _ChannelDirekt(1)
r0 = _ChannelDirekt(2)
b1 = _ChannelDirekt(3)
g1 = _ChannelDirekt(4)
r1 = _ChannelDirekt(5)
b2 = _ChannelDirekt(6)
g2 = _ChannelDirekt(7)
r2 = _ChannelDirekt(8)
b3 = _ChannelDirekt(9)
g3 = _ChannelDirekt(10)
r3 = _ChannelDirekt(11)
##########################################
class TLC59711AutoShow(TLC59711):
"""TLC59711 16-bit 12 channel LED PWM driver with Auto-Show.
This chip is designed to drive 4 RGB LEDs with 16-bit PWM per Color.
The class has an interface compatible with the FancyLED library.
and with this is similar to the NeoPixel and DotStar Interfaces.
this TLC59711AutoShow is a subclass of TLC59711 that adds automatically
sending changed data to the chips.
this creates very slows responses on big changes.
It is mainly usefull if you only have a very small number of pixels.
:param ~busio.SPI spi: An instance of the SPI bus connected to the chip.
The clock and MOSI/outout must be set, the MISO/input is unused.
Maximal data clock frequence is:
- TLC59711: 10MHz
- TLC5971: 20MHz
:param bool pixel_count: Number of RGB-LEDs (=Pixels) that are connected.
"""
def __init__(self, spi, pixel_count=4):
"""Init."""
super().__init__(spi, pixel_count=pixel_count)
##########################################
def set_pixel(self, pixel_index, value):
"""
Set the R, G, B values for the pixel.
this funciton hase some advanced error checking.
it is much slower than the other provided 'bare' variants..
but therefor gives clues to what is going wrong.. ;-)
:param int pixel_index: 0..(pixel_count)
:param tuple value: 3-tuple of R, G, B;
each int 0..65535 or float 0..1
"""
super().set_pixel(pixel_index, value)
self._write()
def set_pixel_all(self, color):
"""
Set the R, G, B values for all pixels.
:param tuple 3-tuple of R, G, B; each int 0..65535 or float 0..1
"""
super().set_pixel_all(color)
self._write()
def set_all_black(self):
"""Set all pixels to black."""
super().set_all_black()
self._write()
# channel access
def set_channel(self, channel_index, value):
"""
Set the value for the provided channel.
:param int channel_index: 0..channel_count
:param int value: 0..65535
"""
super().set_channel(channel_index, value)
self._write()
def __setitem__(self, key, value):
"""
Set the R, G, B values for the pixel.
this funciton hase some advanced error checking.
it is much slower than the other provided 'bare' variants..
but therefor gives clues to what is going wrong.. ;-)
this shortcut is identicall to `set_pixel`
:param int key: 0..(pixel_count)
:param tuple 3-tuple of R, G, B; each int 0..65535 or float 0..1
"""
super().__setitem__(key, value)
self._write()
class _ChannelDirektAutoShow:
# Internal decorator to simplify mapping.
def __init__(self, channel):
self._channel = channel
def __get__(self, obj, obj_type):
# Grab the 16-bit value at the offset for this channel.
return obj._get_channel_16bit_value(self._channel)
def __set__(self, obj, value):
# Set the 16-bit value at the offset for this channel.
assert 0 <= value <= 65535
obj.set_channel(self._channel, value)
obj._write()
# Define explicit channels for first IC.
# → this is only for api backwards compliance.
# not recommended for new use - use *set_channel*
b0 = _ChannelDirektAutoShow(0)
g0 = _ChannelDirektAutoShow(1)
r0 = _ChannelDirektAutoShow(2)
b1 = _ChannelDirektAutoShow(3)
g1 = _ChannelDirektAutoShow(4)
r1 = _ChannelDirektAutoShow(5)
b2 = _ChannelDirektAutoShow(6)
g2 = _ChannelDirektAutoShow(7)
r2 = _ChannelDirektAutoShow(8)
b3 = _ChannelDirektAutoShow(9)
g3 = _ChannelDirektAutoShow(10)
r3 = _ChannelDirektAutoShow(11)Its just a workaround. I am assuming, but it is weird that no-one caught it?
Also as a smaller secondary issue - the printed breakout board numbers the RGB pins from 0 to 3 but the lib works in reverse. So if you want to address R0 on the board you need to address pixel.r3 in code. This might be a simple manufacturing error with my batch tho, and at best is a minor inconvenience - but at the same time I can see someone scratching their head if they connected a single LED to say R0 G0 B0 and are getting no output because its actually outputting to R3 G3 and B3 on the board.
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