James Liu disposedtrolley

When you install a Snap, a .desktop file gets created at /var/lib/snapd/desktop/applications. For example, after running snap install authy, my directory looks like this:

applications ⟩ ls -la                                                                                                            /v/l/s/d/applications
total 8
drwxr-xr-x. 1 root root  66 Nov 20 13:23 ./
drwxr-xr-x. 1 root root  34 Nov 19 14:25 ../
-rwxr-xr-x. 1 root root 377 Nov 19 14:47 authy_authy.desktop*

This is a basic guide on setting up SPI for the STM32F401RE Nucleo board on Zephyr. We'll be bootstrapping a new Zephyr project with CMake, getting a binding to a SPI peripheral on the STM32, and writing a Hello, Zephyr string over the wire.

While I'll be using an STM32F401RE, the process should be similar for most STM32 microcontrollers with a SPI peripheral. Also worth noting that this won't be an exhaustive tutorial, nor does it contain best practice! I struggled with this for a whole afternoon, so I'm posting it just in the hopes of getting people on the right track.

Introduction

The ARM Embedded Toolchain is a GNU licensed cross compiler for ARM CPU architectures, allowing you to compile C/C++ code into binaries which can execute on CPUs such as the Cortex-M line of microcontrollers.

When dealing with C/C++ embedded development, you have the choice of several compilers. Keil is probably the most well-known commercial brand in the embedded toolchain space. They have their own proprietary compiler and IDE which is quite popular for commercial applications (it's pricey and only runs on Windows).

Keybase proof

I hereby claim:

I am disposedtrolley on github.
I am jamesliu (https://keybase.io/jamesliu) on keybase.
I have a public key whose fingerprint is 5A53 9C31 4A93 084D A7C1 C560 20EF BE26 9302 A072

To claim this, I am signing this object:

	#!/usr/bin/env python

	import csv
	import json
	import sys
	import os
	from datetime import datetime

	if __name__ == "__main__":
	if len(sys.argv) != 2:

	session="work"

	tmux new-session -d -s $session

	# Configure window for main project
	tmux selectp -t 0
	tmux rename-window main
	tmux send-keys "cd ~/projects/foo" C-m

	# Configure scratch window

	;; -- mode: emacs-lisp; lexical-binding: t --
	;; This file is loaded by Spacemacs at startup.
	;; It must be stored in your home directory.

	(defun dotspacemacs/layers ()
	"Layer configuration:
	This function should only modify configuration layer settings."
	(setq-default
	;; Base distribution to use. This is a layer contained in the directory
	;; `+distribution'. For now available distributions are `spacemacs-base'

	;; Bits and pieces from reading The Little Schemer, implemented in Racket.

	#lang racket

	(define (atom? x)
	(and (not (pair? x)) (not (null? x))))

	;; Returns whether the supplied s-expression is a list of atoms by
	;; recursively checking each element of the input.
	(define (lat? l)