README

This repository contains assorted example projects for the 1BitSy development platform.

Usage

To be able to compile the examples included in this repository you will require an arm-none-eabi gcc toolchain. We recommend you install the gcc-arm-embedded toolchain that is being maintained by ARM. The downloads and installation instructions for Linux (Ubuntu), Mac OS X and Windows can be found on the gcc-arm-embedded Launchpad page.

You must run "make" in the top level directory first. This builds the library and all examples. If you're simply hacking on a single example after that, you can type "make clean; make" in any of the individual project directories later.

For more verbose output, to see compiler command lines, use "make V=1". For insanity levels of verboseness, use "make V=99".

The makefiles are generally useable for your own projects with only minimal changes for the libopencm3 install path (see Reuse).

Notes

If you are using an older GCC compiler (pre V5), you may need to provide the C standard to the compiler. Otherwise the compiler might complain. To solve the issue you can invoke the make command in the top level directory by setting the CFLAGS variable:

CFLAGS=-std=c99 make

Make Flash Target

For flashing the 'miniblink' example (after you built libopencm3 and the examples by typing 'make' at the top-level directory) onto the 1bitsy, you can execute:

cd examples/1bitsy/miniblink
make flash

The Makefiles of the examples are configured to use a Black Magic Probe by default and will list possible serial ports that it found for you to choose from.

You can also provide the serial port you want directly to the target so that you don't have to choose by invoking:

cd examples/1bitsy/miniblink
make flash BMP_PORT=/dev/ttyACM0

You can also use the dfu-util to upload the selected firmware by running:

cd examples/1bitsy/miniblink
make dfu-flash

Flashing Manually

You can also flash manually using a miriad of different tools depending on your setup. Here are a few examples.

Black Magic Probe

cd examples/1bitsy/fancyblink
arm-none-eabi-gdb miniblink.elf
target extended-remote /dev/ttyACM0
monitor swdp_scan
attach 1
load
run

To exit the gdb session, type <Ctrl>-C and <Ctrl>-D. It is useful to add the following to the .gdbinit to make the flashing and debugging easier:

set target-async on
set confirm off
set mem inaccessible-by-default off
#set debug remote 1
tar ext /dev/ttyACM0
mon version
mon swdp_scan
att 1

Having this in your .gdbinit boils down the flashing/debugging process to:

cd examples/1bitsy/fancyblink
arm-none-eabi-gdb miniblink.elf
load
run

DFU-Util

If you put your 1Bitsy in the DFU Bootloader mode (having the DFU Bootloader jumper shorted while you plug in the USB cable for example) you will be able to use the following command to upload your firmware:

cd examples/1bitsy/fancyblink
make fancyblink.bin
sudo dfu-util -d 0483:df11 -c 1 -a 0 -s 0x08000000:leave -D fancyblink.bin

For this to work you will need dfu-util V0.8 or newer.

Reuse

If you want to use any of the code found here in your own project, this examples repository shows the general way. There is also a 1bitsy-locm3-template repository that can serve as a basis for your project.

1. Create an empty repository

    mkdir mycoolrobot && cd mycoolrobot && git init .
   

2. Add libopencm3 as a submodule

    git submodule add https://github.com/libopencm3/libopencm3
   

3. Grab a copy of the basic rules

   These URLs grab the latest from the libopencm3-examples repository

    wget \
     https://raw.githubusercontent.com/libopencm3/libopencm3-examples/master/examples/rules.mk \
     -O libopencm3.rules.mk
   

4. Grab a copy of your target Makefile in this case, for STM32F4

    wget \
     https://raw.githubusercontent.com/libopencm3/libopencm3-examples/master/examples/stm32/f4/Makefile.include \
     -O libopencm3.target.mk
   

5. Edit paths in libopencm3.target.mk

   Edit the last line of libopencm3.target.mk and change the include to read include ../libopencm3.rules.mk (the amount of .. depends on where you put your project in the next step).

6. Beg/borrow/steal an example project

   For sanity's sake, use the same target as the makefile you grabbed up above.

    cp -a \
     somewhere/libopencm3-examples/examples/stm32/f4/stm32f4-discovery/miniblink \
     myproject
   

   Add the path to OPENCM3_DIR , set the right DEVICE` and modify the path to makefile include:

    diff -u
    --- Makefile.orig       2017-06-11 12:42:25.378248089 +0200
    +++ Makefile    2017-06-11 12:46:42.566244271 +0200
    @@ -19,7 +19,8 @@
   
     BINARY = miniblink
   
    -DEVICE=STM32F407VG
    +OPENCM3_DIR = ../libopencm3
    +DEVICE = STM32F415RGT6
   
    -include ../../Makefile.include
    +include ../libopencm3.target.mk
   

You're done :)

You need to run "make" inside the libopencm3 directory once to build the library, and then you can just run make/make clean in your project directory as often as you like.