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muscribble's Introduction

µScribble

An hardware USB Scribble Strip that supports the Mackie Control Protocol.

µScribble in action

Introduction

µScribble is an USB Midi gadget designed to be a companion to inexpensive faderboxes without displays. It should be compatible with any DAW that supports control surfaces. I've personally used it with Apple Logic Pro and Ableton Live.

The hardware itself is very simple an d based around an STM32F4 evaluation board, sometimes known as "blackpill", while the displays are the SPI variant of the ubiquitous SSD1306 OLED screens.

The software is implemented using the unicore-mx fork of libopencm3 as it has a slighlty better support for the stm32 target platform. It should be relatively easy to port the application code to any microcontroller of choice.

Hardware design files

The hardware is designed using the KiCad EDA

Software

The firmware depends on the arm-none-eabi-gcc toolchain, and to compile it it's sufficient to invoke

make

As a convenience, if you have the STLink tools installed, you can flash the firmware to the device using the st-flash command with

make flash

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muscribble's Issues

Build errors inside unicore?

I'm trying to flash this firmware onto a cheapo stm32f4 (weact brand? Not sure if it matters) but I'm getting stuck on the build step. I've been stumbling through getting all the dependencies squared away, but it seems like unicore-mx has some weird syntax errors. I've tried to debug it, but I'm pretty unfamiliar.

➜  muScribble git:(master) ✗ make flash
make -C unicore-mx TARGETS=stm32/f4 FP_FLAGS="-mfloat-abi=soft"
  GENHDR  include/unicore-mx/sam/3x/irq.json
  GENHDR  include/unicore-mx/sam/4l/irq.json
  GENHDR  include/unicore-mx/sam/3s/irq.json
  GENHDR  include/unicore-mx/sam/3a/irq.json
  GENHDR  include/unicore-mx/sam/3u/irq.json
  GENHDR  include/unicore-mx/sam/3n/irq.json
  GENHDR  include/unicore-mx/lpc17xx/irq.json
  GENHDR  include/unicore-mx/lpc13xx/irq.json
  GENHDR  include/unicore-mx/lpc43xx/m0/irq.json
  GENHDR  include/unicore-mx/lpc43xx/m4/irq.json
  GENHDR  include/unicore-mx/stm32/f4/irq.json
  GENHDR  include/unicore-mx/stm32/f3/irq.json
  GENHDR  include/unicore-mx/stm32/l4/irq.json
  GENHDR  include/unicore-mx/stm32/f2/irq.json
  GENHDR  include/unicore-mx/stm32/l0/irq.json
  GENHDR  include/unicore-mx/stm32/f0/irq.json
  GENHDR  include/unicore-mx/stm32/f7/irq.json
  GENHDR  include/unicore-mx/stm32/l1/irq.json
  GENHDR  include/unicore-mx/stm32/f1/irq.json
  GENHDR  include/unicore-mx/nrf/51/irq.json
  GENHDR  include/unicore-mx/nrf/52/irq.json
  GENHDR  include/unicore-mx/lm3s/irq.json
  GENHDR  include/unicore-mx/efm32/gg/irq.json
  GENHDR  include/unicore-mx/efm32/g/irq.json
  GENHDR  include/unicore-mx/efm32/lg/irq.json
  GENHDR  include/unicore-mx/efm32/tg/irq.json
  GENHDR  include/unicore-mx/vf6xx/irq.json
  BUILD   lib/stm32/f4
/bin/sh: -c: line 0: unexpected EOF while looking for matching `"'
/bin/sh: -c: line 1: syntax error: unexpected end of file
make[1]: *** [Makefile:70: lib/stm32/f4] Error 2
make: *** [Makefile:47: unicore-mx/lib/libucmx_stm32f4.a] Error 2

Any idea what's going wrong here?

Edit: For the record, I also tried building in ubuntu running inside parallels. Similar errors, but slightly different messages. I'm not sure if the fact that it's apple silicon/arm would matter since they're syntax errors. I don't currently have an intel machine to try it on.

Edit: just had the thought that it could be a line ending thing maybe? I'll try windows if I can get parallels working.

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