How to ping by MAC Address
I just find this tip useful: arping -c 5 aa:bb:cc:dd:ee:ff Source: https://unix.stackexchange.com/questions/86165/can-one-ping-a-nic-by-mac
View Articlethe moon… beautiful! oh yeah!
Today I decided to test the Lua (the programming language, it means Moon in Portuguese) with FLTK. There is a project called lua-fltk4lua. Unfortunately the project doesn’t explain how to compile it...
View ArticleOpen source Android Auto alternatives
Some interesting links: http://www.mathieupassenaud.fr/build-your-own-android-auto-head-display/ https://github.com/gartnera/headunit (a fork of a fork of a fork …) https://github.com/f1xpl/openauto
View ArticleUsing coroutine on Lua
The Lua documentation about coroutine is not much clear and the example is not much useful. Fortunately I found an explanation how to use it and simplify the idea here: sleep_awhile = function (period)...
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Checking the CRC-8 PEC byte of MLX90614
I am creating a NuttX device driver for Melexis MLX90614 and it is a nice adventure. First I downloaded the adafruit lib and tested it on Arduino Uno just to confirm the sensor was working, but I...
View ArticleSheding some (infrared) light on MLX90614
After implementing the MLX90614 driver for NuttX I noticed that although the write command to change the device I2C address in the EEPROM was reporting success, after the power cycle the new address...
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How to use a JLX1602G-390 display with NuttX
I just created a driver for NuttX to use JLX1602G-390 display. This display is based on Siatronix ST7032i the I2C version. First you need to wire it connecting an external capacitor and a resistor as...
View ArticleEdgeWrite: writing with joystick
This is a nice way to write with joysticks: https://faculty.washington.edu/wobbrock/pubs/gi-04.pdf Unfortunately this idea is patented: U.S. Patent #7,729,542 http://depts.washington.edu/ewrite/ I...
View ArticleHow to run NuttX on Freedom Board FRDM-K64F
NuttX has support to Freedom K64F and the README file (see nuttx/configs/freedom-k64f/README.txt) give much information about things it supports. After plugging it on my computer (connected to SDA USB...
View ArticleAdding arm-none-eabi-gdb to Ubuntu 18.04
I noticed that gdb-arm-none-eabi package is not present on Ubuntu 18.04 repository. After some searches I saw people suggesting to use gdb-multiarch, but this gdb didn’t work for me. Then after more...
View ArticleNuttX on Atmel/Microchip SAML21 Xplained Pro
$ ./tools/configure.sh saml21-xplained/nsh $ make menuconfig (change build system to Linux) $ make $ JLinkExe -device ATSAML21G18 -if SWD J-Link>connect Connecting to J-Link via USB…O.K. Firmware:...
View ArticleRecovering Android phone pictures after Factory Reset
It is always a good idea to make backup of your pictures to your computer or using some cloud sync solution as Dropbox to make your pictures safe. But not everybody does that. If you don’t, consider...
View ArticleFlashing bootloader and core-firmware on Spark Core
# dfu-util -d 1d50:607f -a 0 -s 0x08005000:leave -D core-firmware.bin
View ArticleComo debugar o kernel ativando as mensagens de debug pr_debug
Para ativar as mensagens de Debug do kernel, edite o arquivo Makefile da raiz do kernel adicionando: CFLAGS_KERNEL = -DDEBUG
View ArticleInstalling Jenkins on Ubuntu 18.04
I installed Jenkins on my Linux machine following this tutorial: https://linuxize.com/post/how-to-install-jenkins-on-ubuntu-18-04/ But the command: $ sudo apt install jenkins Failed! It happened...
View ArticleCompiling NuttX to BeagleBoneBlack
These are the steps I took to get NuttX running on BeagleBoneBlack (BBB) : $ git clone https://bitbucket.org/nuttx/nuttx $ git clone https://bitbucket.org/nuttx/apps $ cd nuttx $ ./tools/configure.sh...
View ArticleFlashing NuttX on Engie CE0035 board
$ JLinkExe -device ATSAML21G18 -if SWD SEGGER J-Link Commander V6.40 (Compiled Oct 26 2018 15:08:38) DLL version V6.40, compiled Oct 26 2018 15:08:28 Connecting to J-Link via USB…O.K. Firmware: J-Link...
View ArticleHow to use NuttX I2C Scan features
First you need to enable I2C to your MCU, and these additional options: CONFIG_I2C=y CONFIG_I2C_DRIVER=y CONFIG_SYSTEM_I2CTOOL=y CONFIG_I2CTOOL_MINBUS=0 CONFIG_I2CTOOL_MAXBUS=5...
View ArticleUsing MODBUS RTU with NuttX
MODBUS is an old protocol used on industrial automation. Although it is an “old” protocol, it still used on many industrial devices. There are many articles about this protocol in the Internet, but...
View ArticleMachine Learning for Microcontrollers
This is a small list of open-source ML projects that could be used on MCU : CMSIS-NN: https://github.com/ARM-software/CMSIS_5/tree/develop/CMSIS/NN Libdeep: https://gitlab.com/bashrc2/libdeep uTensor:...
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