mzero

MacOS USB MIDI Corruption

Summary

When sending modest sized System Exclusive MIDI messages to a USB MIDI device, CoreMIDI will sometimes corrupt the message by dropping some blocks of the message, while duplicating others.

Impact

mzero

/* DMA Stall

This sketch will demonstrate how the FreeTrouch library code makes reads to
PTC peripheral registers without the required Read-Synchronization.  While
such reads succeed, they stall the AHB-APB Bridge C.

This is normally not an issue - but if there are other accesses going through
that bridge, then they will be stalled as well. A common example is to use the
DMAC to transfer data to the DAC or from the ADC.  These peripherals are on
the same bridge (C). Stalls caused by non-scyhcronized reading seem to be on

mzero

#include <Arduino.h>

class DebouncedSwitch {
public:
    DebouncedSwitch(int p, int mode=INPUT_PULLDOWN) : pin(p), nextValidAt(0) {
        pinMode(pin, mode);
        state = nextState = digitalRead(pin);
    }

    bool update() {

mzero

/**
*** Probes & Data storage
**/

AdafruitIO_Feed *probe1 = io.feed("probe_one");
AdafruitIO_Feed *probe2 = io.feed("probe_two");
AdafruitIO_Feed *probe3 = io.feed("probe_three");
AdafruitIO_Feed *probe4 = io.feed("probe_four");

const int numberOfProbes = 4;

mzero

#include "RTClib.h"
#include <Adafruit_MCP23017.h>
#define NUM_ONES_LEDS 4

RTC_DS3231 rtc;
Adafruit_MCP23017 mcpMinutes;
Adafruit_MCP23017 mcpHours;
Adafruit_MCP23017 mcpMonths;
Adafruit_MCP23017 mcpDayLow;
Adafruit_MCP23017 mcpDayHigh;

mzero

#include "RTClib.h"
#include <Adafruit_MCP23017.h>
#define NUM_ONES_LEDS 4

enum {
  pinFirst = 0,
  pinLast = 15,

  pinJanuary = 0,
  pinFebruary,

mzero

#include <Adafruit_SPIFlash.h>


namespace {

  // ===
  // === Test Data Generation and Checking
  // ===

  const size_t BLOCKSIZE = 512;

mzero

building the linux digitakt usb driver

needed to install

sudo apt install flex bison libssl-dev libncurses5-dev bc

clone kernel sources

cd
mkdir kernel

cd kernel/

mzero

"""Convert DDP mastered CDs to Kunaki's CUE format.

tl;dr:
    python ddp-to-kunaki.py my-cool-cd-ddp-dir my-cool-cd-kunaki

This will produce two files:

    my-cool-cd-kunaki.CUE   <-- the markers
    my-cool-cd-kunaki.iso   <-- the audio (*not* an ISO format file!)

mzero

#!/bin/sh

. /usr/local/pisound/scripts/common/common.sh

log "starting pbj"
flash_leds 1

killall scsynth
killall sclang
rm -f /tmp/sclang-*.log 2>/dev/null || true