adafruit / adafruit_circuitpython_ws2801 Goto Github PK

Hi all,

I just have some questions with this repository. :-)

Q1.
I am just wondering that is this repository compatible with the hardware (NVIDIA Jetson series)?

Q2.
Could you please explain me that what is the difference between this repository and the Blinka repository?

There are missing type annotations for some functions in this library.

The typing module does not exist on CircuitPython devices so the import needs to be wrapped in try/except to catch the error for missing import. There is an example of how that is done here:

try:
    from typing import List, Tuple
except ImportError:
    pass

Once imported the typing annotations for the argument type(s), and return type(s) can be added to the function signature. Here is an example of a function that has had this done already:

def wrap_text_to_pixels(
    string: str, max_width: int, font=None, indent0: str = "", indent1: str = ""
) -> List[str]:

If you are new to Git or Github we have a guide about contributing to our projects here: https://learn.adafruit.com/contribute-to-circuitpython-with-git-and-github

There is also a guide that covers our CI utilities and how to run them locally to ensure they will pass in Github Actions here: https://learn.adafruit.com/creating-and-sharing-a-circuitpython-library/check-your-code In particular the pages: Sharing docs on ReadTheDocs and Check your code with pre-commit contain the tools to install and commands to run locally to run the checks.

If you are attempting to resolve this issue and need help, you can post a comment on this issue and tag both @FoamyGuy and @kattni or reach out to us on Discord: https://adafru.it/discord in the #circuitpython-dev channel.

The following locations are reported by mypy to be missing type annotations:

• adafruit_ws2801.py:52
• adafruit_ws2801.py:90
• adafruit_ws2801.py:96
• adafruit_ws2801.py:109
• adafruit_ws2801.py:125
• adafruit_ws2801.py:147
• adafruit_ws2801.py:152
• adafruit_ws2801.py:162

I can operate a ws2801 led strip with the old/deprecated python2 adafruit_ws2801 lib.
my pin assignment:

5V  => 04 (+5)
CK  => 23 (SCLK)
SI  => 19 (MOSI)
GND => 06 (GND)

a pprint(board) shows me the following dict:

'pin': <module 'adafruit_blinka.microcontroller.bcm283x.pin' from '/usr/local/lib/python3.7/dist-packages/adafruit_blinka/microcontroller/bcm283x/pin.py'>, 'D0': 0, 'D1': 1, 'D2': 2, 'SDA': 2, 'D3': 3, 'SCL': 3, 'D4': 4, 'D5': 5, 'D6': 6, 'D7': 7, 'CE1': 7, 'D8': 8, 'CE0': 8, 'D9': 9, 'MISO': 9, 'D10': 10, 'MOSI': 10, 'D11': 11, 'SCLK': 11, 'SCK': 11, 'D12': 12, 'D13': 13, 'D14': 14, 'TXD': 14, 'D15': 15, 'RXD': 15, 'TX': 14, 'RX': 15, 'D16': 16, 'D17': 17, 'D18': 18, 'D19': 19, 'MISO_1': 19, 'D20': 20, 'MOSI_1': 20, 'D21': 21, 'SCLK_1': 21, 'SCK_1': 21, 'D22': 22, 'D23': 23, 'D24': 24, 'D25': 25, 'D26': 26, 'D27': 27, 'I2C': <function I2C at 0xb667f738>, 'SPI': <function SPI at 0xb65fc030>}

which doesn't match the pin layout of the 4B model at all.
For instance, on the 4B
MOSI is 19 and SCLK is 23

see https://pinout.xyz/

Is there any way to configure/setup the lib by using the constructor differently?

Raspbian Buster Lite 2019-09-26, Pi 3 B, Python 3.7.3
Hardware SPI works OK. Attempting other pins throws NotImplementedError.

I'm trying to migrate from the deprecated WS2801 library to the new one, but am having trouble.

When I use the old library, the LED in position 0 lights up red:

In [6]: from Adafruit_WS2801 import WS2801Pixels
In [7]: pixels = WS2801Pixels(150, 11, 10)
In [8]: pixels.set_pixel_rgb(0, 255, 0, 0)
In [9]: pixels.show()      # this works and I see the pixel light up

However, using this library, the pixel does not light

In [1]: from adafruit_ws2801 import WS2801
In [2]: import board
In [3]: pixels = WS2801(board.D11, board.D10, 150);
In [4]: pixels[0] = (255, 0, 0)
In [5]: pixels.show()   # the pixel doesn't light up 

I'm using a Raspberry Pi 3B+

In [6]: board.board_id
Out[6]: 'RASPBERRY_PI_3B_PLUS'

Appreciate any help!

When trying to run this using Hardware SPI (SCK and MOSI), it doesn't appear to be working at all as in none of the lights do anything. I was able to run just fine on the Raspberry Pi using Hardware SPI.

This code can easily be refactored to use adafruit_pixelbuf - refactoring based on adafruit_dotstar will help guide the work.

When getting a value from an LED, the value returned is in reverse of what it was set to. For example in this code snippet we initialize the LEDs and set leds[0] to (255, 0, 0):

import board
import adafruit_ws2801

odata = board.D5
oclock = board.D6
numleds = 25
bright = 1.0
leds = adafruit_ws2801.WS2801(oclock, odata, numleds, brightness=bright, auto_write=True)
leds[0] = (255, 0, 0)

Now if we try and retrieve it, we get (0, 0, 255)

print(leds[0]) # Returns (0, 0, 255)