working_on [jsln]

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**PR19_01_XMC**    //Infineon XMC4800 development environment with Docker containers.//
  * TODO: Add lizard static analysis
  * TODO: https://interrupt.memfault.com/blog/boostrapping-libc-with-newlib
  * TODO: https://interrupt.memfault.com/blog/automate-debugging-with-gdb-python-api

<color /#00ff00>**PR19_02_Sensors**</color>    //Air quality PM sensor measurements and data visualization.//
  * TODO: https://www.freecodecamp.org/news/how-to-monitor-your-air-quality-with-this-diy-setup-3399793137c3/
  * TODO: https://seetheair.wordpress.com/2020/02/18/low-cost-portable-monitors-vs-reference-monitors-part1/
  * Sensirion SPS30 (https://www.digikey.de/product-detail/en/sensirion-ag/SEK-SPS30/1649-1107-ND/9598991)
  * Renesas ZMOD4410
  * http://www.ica.miteco.es/
  * see [[sensors]]
  * see [[air monitoring system components]]

**PR19_03_Yocto**    //Yocto environment for STM32P1 board.//
  * TODO: real-time
  * TODO: https://onlinelibrary.wiley.com/doi/full/10.1002/eng2.12114

**PR20_01_STM32**    //STM32 development environment with libopencm3.//
  * TODO: Consolidate makefiles (use XMC4800 makefile, http://reecestevens.me/blog/2016/07/08/embedded-programming-without-ide/). Add also improvements from https://tty.uchuujin.de/2016/02/stm32-from-scratch-makefile/.
  * TODO: Measure improvements by using SRAM for code, as well as using ITCM memory (https://rhye.org/post/stm32-with-opencm3-4-memory-sections/).
  * TODO: STM32MP1 environment, follow https://bootlin.com/blog/building-a-linux-system-for-the-stm32mp1-basic-system/

<color /#00ff00>**PR20_02_RTEMS**</color>    //Develop a simple application on an ARM platform (SPI sensor throughput, CPU load, GPIO interrupt latency, interrupt latency with user thread processing, PPS jitter).//
  * [[MCU execution time]]
  * [[pulse measurement]]
  * <del>TODO: Run RTEMS examples in Nucleo hardware</del>
  * <del>TODO: Run RTEMS tests in Nucleo hardware</del>
  * [[RTEMS BSP for TMS570LC4357]]
  * Run Nucleo examples from SRAM
  - GPIO toggling on bare-metal. Compare performance of different boards, flash/RAM/ITCM, etc.
  - Interrupt latency (GPIO input/output) on bare-metal. Compare performance of different boards, flash/RAM/ITCM, etc.
  - GPIO toggling on RTEMS using a single uninterrupted task. Compare performance of different boards. Useful to make sure the systems and toolchains are working as expected. Running from flash/RAM/ITCM.
  - RTEMS interrupt latency and jitter at different CPU loads (GPIO input/output). Compare performance of different boards.
  - RTEMS scheduling latency and jitter using mutex at different CPU loads (measured using two GPIO outputs). Compare performance of different boards.
  - RTEMS periodic timer jitter at different CPU loads (measured using one GPIO output). Compare performance of different boards.
  - RTEMS contribution: CPU load
  - RTEMS contribution: task priority assignment with ML



**PRXX_XX_Micropython**
  * TODO: https://neil.computer/notes/how-to-compile-and-flash-micropython-firmware-on-stm32f7/



====== EtherCAT ======
[[https://www.youtube.com/watch?v=uFbr7xBjItE|Machinekit + EtherCAT on RPi3 MQTT broker latency test]]

[[https://www.youtube.com/watch?v=1upqqL_kBmw|Accurate Synchronization ethercat systems using distributed clocks]]
====== IMU helicopter control ======

http://iot.ee.ucla.edu/UCLA-STMicro/index.php/Home

ST material:

STEVAL-FCU001V1

STEVAL-STLKT01V1

STEVAL-IDI001V1

DT0064
Design tip - Noise analysis and identification in MEMS sensors

[[https://www.adafruit.com/product/164|Adafruit IR distance sensor]]

[[https://www.adafruit.com/product/3317|Adafruit ToF distance sensor]]

[[https://www.tindie.com/products/blecky/mappydot-micro-smart-lidar-sensor/|MappyDot]]
====== PTP ======

http://www.eecis.udel.edu/~mills/ptp.html

http://home.mit.bme.hu/~khazy/ptpd/

http://lwn.net/Articles/520203/

http://lists.ntp.org/pipermail/hackers/2013-October/006157.html

http://nullr0ute.com/2014/04/3-14-fedora-arm-kernel-status/

http://www.belden.com/docs/upload/precision_clock_synchronization_wp.pdf

http://www.ieeeboston.org/publications/society_presentations/Implementation_of_IEEE_1588_Protocol_on_Embedded_Processors_Pub_Jiang_Wu.pdf

http://www.ixxat.com/introduction_ieee_1588_en.html

https://community.freescale.com/thread/324194

http://processors.wiki.ti.com/index.php/TI81XX_PSP_Ethernet_Switch_User_Guide#IEEE_1588.2F802.1AS_PTP_Support

http://ptpd.sourceforge.net/

==== linuxptp ====

http://linuxptp.sourceforge.net/

https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html-single/Deployment_Guide/#ch-Configuring_PTP_Using_ptp4l

  ptp4l -i eth0 -m
  pmc -u -b 0 'GET CURRENT_DATA_SET'
  pmc -u -b 0 'GET TIME_STATUS_NP'
  phc2sys -s eth0 -w

Accuracy improvements:
  nohz=off

==== Statistics ====
https://github.com/aewallin/allantools/

====== Linux PPS support ======
http://linuxpps.org/wiki/index.php/Main_Page

http://www.linuxpps.org/pipermail/discussions/2013-May/004430.html

http://ml.enneenne.com/pipermail/linuxpps/2011-August/thread.html#4331

====== GPS NTP timestamps ======

**http://www.leapsecond.com/time-nuts.htm**

http://www.febo.com/pipermail/time-nuts/2013-June/077959.html

http://the8thlayerof.net/2013/12/08/adafruit-ultimate-gps-cape-creating-custom-beaglebone-black-device-tree-overlay-file/

Measurement: jitter, offset, allan deviation

[[http://www.sigrok.org/blog/blogs/joel-holdsworth|sigrok and gpsd]]

http://github.com/ddrown/wwvb
====== High resolution timers ======

http://e2e.ti.com/support/microcontrollers/msp430/f/166/t/187153.aspx

http://www.st.com/web/en/catalog/mmc/FM141/SC1169/SS1576

http://electronics.stackexchange.com/questions/59216/very-accurate-time-measurement

====== Power management ======
https://mindlinux.wordpress.com/2014/02/02/power-management-a-system-wide-challenge-peter-de-schrijver/

====== BBB ======

http://hackaday.com/2013/12/07/speeding-up-beaglebone-black-gpio-a-thousand-times/

http://blog.dan.drown.org/beaglebone-black-timer-capture-driver/

====== i.MX6 ======

http://www.cse.unsw.edu.au/~cs9242/13/project/m1.shtml

====== MSP430 ======

http://homepages.ius.edu/rwisman/C335/html/msp430GetStarted.HTM

http://microcontrollershop.com/product_info.php?products_id=5740

http://www.schmartboard.com/schmartboard_pd_710-0009-02_l.jpg

http://e2e.ti.com/support/microcontrollers/msp430/f/166/t/142094.aspx

http://43oh.com/2010/08/10-beginner-msp430-tutorials-and-counting/
===== serial =====

http://www.argenox.com/library/msp430/ch8-msp430_uart.php

http://www.mikrocontroller.net/topic/241214

====== Vehicle counting ======
https://publiclab.org/questions/stevie/07-13-2018/what-is-a-good-way-to-track-vehicular-traffic

====== Other useful hardware ======

http://www2.fisica.unlp.edu.ar/~veiga/life54.html

====== Digital filters ======
https://stratifylabs.co/embedded%20design%20tips/2013/10/04/Tips-An-Easy-to-Use-Digital-Filter/

http://eleceng.dit.ie/frank/arm/BareMetalSTM32F303Nucleo/fir/

https://www.theunterminatedstring.com/cmsis-arm-fir-comparison/

http://www.onarm.com/forum/62573/

http://zipcpu.com/dsp/2017/11/04/genfil-tb.html

https://github.com/mhorauer/XMC4500-Barebone-Projects

http://www.eas.uccs.edu/~mwickert/ece5655/lecture_notes/ARM/ece5655_chap6.pdf

===== Implementing FIR filters =====

http://zipcpu.com/dsp/2017/12/06/fastfir-tb.html

===== Implementing EMA filters =====

https://www.embeddedrelated.com/showcode/304.php

https://dev.to/nestedsoftware/exponential-moving-average-on-streaming-data-4hhl

https://helpful.knobs-dials.com/index.php/Low-pass_filter

https://dsp.stackexchange.com/questions/40462/exponential-moving-average-cut-off-frequency/40465

https://www.rowetel.com/?p=1245

===== Implementing IIR filters =====
https://dspguru.com/dsp/howtos/implement-iir-filters/

https://www.edn.com/design/analog/4315624/Fixed-point-IIR-filter-challenges

===== Unit testing =====
https://stackoverflow.com/questions/27723062/unit-testing-for-signal-processing