todbot

# demonstrate blocking of usb.core.Device.read() 
#  4 May 2024 - @todbot and @jedgarpark
"""
This sketch demonstrates how `device.read()` blocks infinitely, which is different from established behavior. 

The normal semantics of `device.read()` when using either `busio.UART` or `usb_midi.PortIn`
is that the read() does not noticably block if a `timeout` is given. 
(Explicitly in the constructor of `busio.UART` and apparently implicitly in just how `usb_midi` works)

But for the `usb.core.Device` that is returned (as demo'd below), the `device.read()` blocks forever. 

todbot

# SPDX-FileCopyrightText: Copyright (c) 2023 Scott Shawcroft for Adafruit Industries
# SPDX-FileCopyrightText: Copyright (c) 2024 Tod Kurt
#
# SPDX-License-Identifier: Unlicense
#
# Forward MIDI from device on USB Host port to computer via USB MIDI 
# and 5-pin serial MIDI via MIDI Feather Wing or similar MIDI output.
# Suppots hot-plug of the device on the USB Host port.
#
# adapted from https://github.com/adafruit/Adafruit_CircuitPython_USB_Host_MIDI/blob/main/examples/usb_host_midi_simpletest.py

todbot

# quick-n-dirty MIDI controller with Circuit Playground Express
# 30 Apr 2024 - @todbot / Tod Kurt
# Works on Circuit Playground Express in CircuitPython 9, 
#  but will also work on also any board with touchio, like Trinket M0 or QTPy M0
# Uses the minimal number of libraries to save RAM on the tiny M0 in the CPX
#  (e.g. cannot load `adafruit_circuitpython`, `adafruit_midi`, and `adafruit_debouncer` on CPX)

import board
import touchio
import usb_midi

todbot

// samd21 blink LED on PA10 on Trinket M0, controlled by button on D3 (PA07)
// adapted / stolen from:
// https://github.com/LifeWithDavid/RaspberryPiPico-BareMetalAdventures/blob/main/Chapter%2004/assembly.s
// with much help from https://www.whynotestflight.com/excuses/its-alive-samd21e18a-assembly-no-sdk/
    
.cpu cortex-m0
.syntax unified
.thumb

.global main                    // 'main' used in startup.s

todbot

// samd21 blink LED on PA10 on Trinket M0
// adapted / stolen from:
// https://github.com/LifeWithDavid/RaspberryPiPico-BareMetalAdventures/blob/main/Chapter%2004/assembly.s
    
.cpu cortex-m0
.syntax unified
.thumb

.global main                // used in startup.s
    

todbot

// originally from: https://github.com/dwelch67/atsamd_samples/tree/master/ATSAMD21/sparkfun/blinker01

#include <stdint.h>  // for uint32_t

int main(void) {
    
    unsigned int ra;
    unsigned int rx;

    uint32_t* PORT_A_DIR = (uint32_t*)0x41004400;  // "PORT" from Table 12-1 & 23.7 of SAMD21 Datasheet 

todbot

# bitmapfilter_play3_code.py -- chops + blur on random lines 
# 2 Apr 2024 - @todbot / Tod Kurt
import time, math, random
import board
import rainbowio
import vectorio
import displayio
import bitmaptools
import bitmapfilter
import gc 

todbot

# bitmapfilter_play2_code.py -- spirograph fun w/ bitmapfilter
# 1 Apr 2024 - @todbot / Tod Kurt
import time, math, random
import board
import rainbowio
import vectorio
import displayio
import bitmaptools
import bitmapfilter

todbot

# Make an internet clock with CircuitPython using WorldTimeAPI.org
# 31 Mar 2024 - @todbot / Tod Kurt
# Use resulting strings for displaying on a display of some kind
import os, time
import wifi
import adafruit_requests
import socketpool
import ssl

time_url = "http://worldtimeapi.org/api/ip"

todbot

# starting to play with bitmapfilter
# 31 Mar 2024 - @todbot / Tod Kurt
import time, math, random
import board
import vectorio
import displayio
import bitmaptools
import bitmapfilter

display = board.DISPLAY