Handy Stuff

Embedded Stuff

Always disable Systicksbefore going into EM2- EM3!

Pullup resistors can draw a lot of power! --> Set GPIO Ports high to prevent this

I2C on EFM32 when using I2CSPM library

• ( I2C address << 1 )
• IIC_WriteReadBuffer( ( I2C_ADDRESS << 1 ), wBuffer, wLength, rBuffer, rLength);

wBuffer[0] --> I2C register address

wBuffer[1] --> data to write

• When reading: wLength = 1
• When writing 1 byte: wLength = 2

Add math.h to Silplicity studio project

project properties window, then to C/C++ build --> settings --> GNU ARM C linker --> Libraries, then in the Libraries (-l) window, click "Add..>" and type "m" in the window that pops up. This should allow you to add the standard C math library into the project.

Debug tips & tricks

• No. 1: Clean build !!!
• enable necessary clocks
• include all em_lib.c files
• include all em_lib.h files
• include folders in project
• Sometimes you think it's included, but it's not!

Debug jumping around FIX:

• Debug --> Debug Configurations --> Exceptions --> Enable All

• Project properties --> C/C++ Build --> Settings --> Debug Settings --> Debug Level --> Maximum (-g3) or Default (-g)

• Project properties --> C/C++ Build --> Settings --> Optimization --> None (-O0) or Optimize for debugging (-Og)

• Problem can be invisible character in code:
  With: #ifdef x -- #endif check until where code runs

Going ultra-low power

• Disable pins using: GPIO_PinModeSet(BLE_PORT, BLE_PIN_TX, gpioModeDisabled, 0);

• Do NOT use 1 at the end, this sets a pullup resistor and draws about 15 microA per pin!!

• Disable clocks to all peripherals

• When using RTCDRV timer, you must use RTCDRV_DeInit() otherwise MCU will wake-up every 7-8 minutes.

Correct usage:

RTCDRV_Init();
RTCDRV_AllocateTimer (&IMU_Idle_Timer );
RTCDRV_StartTimer( IMU_Idle_Timer, rtcdrvTimerTypePeriodic, 2000, (RTCDRV_Callback_t)CheckIMUidle, NULL);
RTCDRV_StopTimer( IMU_Idle_Timer );
RTCDRV_DeInit();

PCB Design good practices

• No ground plane under antenna

• Use test-points + jumpers

• Decoupling, decoupling, decoupling!

• 100nF on VDD lines

• ALWAYS follow datasheet recommendations

• Be carefull with ground planes next to traces!, this creates parasitic capacitances which may influence your circuit

• Separate DGND and AGND plane - separate by condensator or high ohm resistor

Eagle

Shortcut	Action
CHANGE PACKAGE 'xxx'	Change multiple footprints
RATSNEST	FIll all planes
RIPUP @;	Ripup ground planes after ratsnest
VIA 'GND'	Place via connected to GND

Git - GitHub

Delete commits from GitHub:

• git reset --hard d4df9b850f25ae8ae81a41d7979ebbdb77a1eefb

• git push origin +d4df9b850f25ae8ae81a41d7979ebbdb77a1eefb^:develop

• d4df9b850f25ae8ae81a41d7979ebbdb77a1eefb = commit nr

• develop = branch name

Create new branch

• git branch newbranch_name

Doxygen documentation

Github pages

Add .nojekyll file to /docs/ folder

Github does not recognize /_filename files

Documentation example

Click Here

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Linux

Pack tarball

tar -czvf xxx.tar.gz xxx

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VS Code

For a full overview of shortcuts, see: VS Shortcuts

Shortcut	Action
ALT+Z	Toggle Word Wrap
F1	Command Window
CTRL+K CTRL+O	Open folder
CTRL+:	Toggle line comment
CTRL+K+C:	Comment
CTRL+K+U:	Uncomment
SHIFT+ALT+F	Auto format document
CTRL + K (then press O)	Open current tab in new window

LaTeX

LaTeX Template

Click Here

Capitals in bibtex

Place {...} around capital letters

Figure full width in IEEE template

use

\begin{figure*}
    \centering
    \includegraphics{}
    \caption{Caption}
    \label{fig:my_label}
\end{figure*}

ORCID id next to name

Include package

\usepackage{orcidlink}

and in text use:

Name Surname \orcidlink{0000-0000-0000-0000}

Maple

maple to latex: latex( "insert maple formula here" )

Formula tools

Mathpix converts pictures / screenshots to LaTeX formulas.

Quotes

\usepackage[]{textcmds}
\q{}

Python

PYTHON GRAPHS TEMPLATE LATEX

Click Here

Python create virtual invironment

python -m venv .venv

Set execution policy

Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope Process

Activate venv

.venv\Scripts\activate

Install necessary packages

pip install -r requirements.txt

Inkscape

PDF to SVG conversion: inkscape -l output.svg input.pdf

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PCB Manufacturing

https://www.pcbway.com/
https://jlcpcb.com/

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Windows

Shortcut	Action
WIN+E	File explorer
CTRL+SHIFT+ESC	Task manager
CTRL+ALT+DEL	Task manager 2

Chrome

Shortcut	Action
CTRL+T	Open new tab
CTRL+N	Open new window
CTRL+SHIFT+T	Open recently closed tab
CTRL+W	Close tab

PowerPoint

Progress bar on dia's

• Search Macro's
• Add macro
• Add This Code

Change all extension in a folder

• Open CMD or Powershell
• ren *.LRV *.mp4

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Adobe suite

Lightroom

• HDR photo's auto stack: photo --> Auto stack by capture time

Shortcut	Action
CTRL+H	Make HDR
CTRL+SHIFT+H	HDR based on previous settings

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