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https://github.com/libopencm3/libopencm3-examples

Simple example projects showing how to use libopencm3.
https://github.com/libopencm3/libopencm3-examples

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Simple example projects showing how to use libopencm3.

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README 

        
# README

[![Build Status](https://travis-ci.org/libopencm3/libopencm3-examples.svg?branch=master)](https://travis-ci.org/libopencm3/libopencm3-examples)



[![Gitter channel](https://badges.gitter.im/libopencm3/discuss.svg)](https://gitter.im/libopencm3/discuss)



This repository contains assorted example projects for libopencm3.



The libopencm3 project aims to create an open-source firmware library for

various ARM Cortex-M microcontrollers.



For more information visit http://libopencm3.org



The examples are meant as starting points for different subsystems on multitude

of platforms. If you're just looking to test your build environment and hardware,

the [libopencm3-miniblink](https://github.com/libopencm3/libopencm3-miniblink) 

may be more useful, as it covers _many_ more boards, but it is much more limited.



Feel free to add new examples and send them to us either via the mailinglist or

preferably via a github pull request.



## Usage



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)



## Make Flash Target



Please note, the "make flash" target is complicated and not always self-consistent.  Please see: https://github.com/libopencm3/libopencm3-examples/issues/34



For flashing the 'miniblink' example (after you built libopencm3 and the

examples by typing 'make' at the top-level directory) onto the Olimex

STM32-H103 eval board (ST STM32F1 series microcontroller), you can execute:



    cd examples/stm32/f1/stm32-h103/miniblink

    make flash V=1



The Makefiles of the examples are configured to use a certain OpenOCD

flash programmer, you might need to change some of the variables in the

Makefile if you use a different one.



To program via a Black Magic Probe, simply provide the serial port, eg:



    cd examples/stm32/f1/stm32-h103/miniblink

    make flash BMP_PORT=/dev/ttyACM0



To program via texane/stlink (st-flash utility), use the special target:



    cd examples/stm32/f1/stm32vl-discovery/miniblink

    make miniblink.stlink-flash



If you rather use GDB to connect to the st-util you can provide the STLINK\_PORT

to the flash target.



    cd examples/stm32/f1/stm32vl-discovery/miniblink

    make flash STLINK_PORT=:4242



## Flashing Manually

You can also flash manually. Using a miriad of different tools depending on

your setup. Here are a few examples.



### OpenOCD



    openocd -f interface/jtagkey-tiny.cfg -f target/stm32f1x.cfg

    telnet localhost 4444

    reset halt

    flash write_image erase foobar.hex

    reset



Replace the "jtagkey-tiny.cfg" with whatever JTAG device you are using, and/or

replace "stm32f1x.cfg" with your respective config file. Replace "foobar.hex"

with the file name of the image you want to flash.



### Black Magic Probe



    cd examples/stm32/f1/stm32vl-discovery/miniblink

    arm-none-eabi-gdb miniblink.elf

    target extended_remote /dev/ttyACM0

    monitor swdp_scan

    attach 1

    load

    run



To exit the gdb session type `-C` and `-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/stm32/f1/stm32vl-discovery/miniblink

    arm-none-eabi-gdb miniblink.elf

    load

    run



### ST-Link (st-util)



This example uses the st-util by texane that you can find on [GitHub](https://github.com/texane/stlink).



    cd examples/stm32/f1/stm32vl-discovery/miniblink

    arm-none-eabi-gdb miniblink.elf

    target extended-remote :4242

    load

    run



## Reuse



If you want to use libopencm3 in your own project, the _easiest_ way is

to use the template repository we created for this purpose.



See https://github.com/libopencm3/libopencm3-template