FatFS, MinIni, Shell and FreeRTOS for the NXP K22FN512

I’m using the NXP Kinetis K22FN512 in many projects, either with the FRDM-K22F or on the tinyK22: with 120 MHz, 512 KByte FLASH and 128 KByte it has plenty of horsepower for many projects. The other positive thing is that it is supported by the NXP MCUXpresso IDE and SDK. I have now created an example which can be used as base for your own project, featuring FreeRTOS, FatFS, MinIni and a command line shell.

FRDM-K22F with SD Card

FRDM-K22F with SD Card

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McuOnEclipse Components: 12-Mar-2017 Release

I’m pleased to announce that a new release of the McuOnEclipse components is available in SourceForge, with the following main features and changes:

  • Wait: Busy-Waiting using ARM DWT cycle counter
  • Percepio FreeRTOS+Trace: Updated to version 3.1.1, simplified usage of streaming and snapshot mode
  • GenericSWI2C: MCUXpresso SDK can be used with the bit-banging I2C driver support
  • FreeRTOS: includes updates of the 9.0.1 release, ‘optimized task selection, enabled MPU support (experimental)
  • Graphical GUI drivers for screens, windows, icons, headers, text widgets and more
  • SSD1351: display driver for Solomon Systech SSD1351 display
  • More components are now supported by the McuLibConfig settings
  • Many other smaller bug fixes and enhancements

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nRF24L01+ 2.4 GHz Wireless Connectivity with the tinyK20 Board

I’m using the tiny and inexpensive Nordic Semiconductor nRF24L01+ transceiver (see “Tutorial: Nordic Semiconductor nRF24L01+ with the Freescale FRDM-K64F Board“) in many projects: it costs less than $3 and allows me to communicate with a proprietary 2.4GHz protocol in a low power way (see “IoT: FreeRTOS Down to the Micro Amps“). I have that transceiver now running with the tinyK20 board too:

nRF24L01+ Transceiver with tinyK20

nRF24L01+ Transceiver with tinyK20

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How to Add Bluetooth Low Energy (BLE) Connection to ARM Cortex-M

In many of my embedded projects I’m using successfully the Nordic Semiconductor nRF24L01+ (see “Tutorial: Nordic Semiconductor nRF24L01+ with the Freescale FRDM-K64F Board“) and the HC-06 Bluetooth transceivers (see “Getting Bluetooth Working with JY-MCU BT_BOARD V1.06“) for wireless communication. However, the nRF24L01+ is using a proprietary protocol, and the HC-06 does not work with Apple products (it does very well with Android devices). To close that gap I decided to add Bluetooth Low Energy (BLE, or Bluetooth 4.x). So this post is about how to add Bluetooth Low Energy (BLE) to NXP (formerly Freescale) Kinetis devices:

BLE Enabled Kinetis

BLE Enabled Kinetis

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Tutorial: Playing MP3 Files with VS1053B and FRDM Board

I want to make some noise with this post!!! This tutorial is about adding music and sound capabilities to the Freescale Freedom board, and to have a lot of fun with it :-). I need this ability for a larger project working on for a while. But I thought I share that sub-part how to play sound files. So with this tutorial I can turn my Freescale Freedom board into a music or sound player :-). And adding sounds is a cool way for any project, and as the music is stored on an SD card it fits easily hours of music or sounds.

MP3 Player with FRDM-KL25Z

MP3 Player with FRDM-KL25Z and Adafruit Music Maker MP3 Shield

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Tutorial: Nordic Semiconductor nRF24L01+ with the Freescale FRDM-K64F Board

For some time I’m using the Nordic Semiconductor nRF24L01+ transceiver successfully in many projects (see “Tutorial: Ultra Low Cost 2.4 GHz Wireless Transceiver with the FRDM Board“). Since that tutorial things evolved a lot with the introduced RNet Stack. To honor the popularity of the Nordic Semiconductor nRF24L01+, Freescale has put a socket on the FRDM-K64F board. So time to make a new step-by-step tutorial how to use the nRF24L01+ with the FRDM-K64F.

Two FRDM-K64F Boards with nRF24L01+ Transceiver

Two FRDM-K64F Boards with nRF24L01+ Transceiver

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FRDM with Arduino Ethernet Shield R3, Part 4: MinIni

I admit: my Ethernet Shield project got stuck because of too many urgent other priorities. I was not happy with the way the project was using configuration data from FLASH memory: I have now multiple ethernet shields in use, and configuring the IP address for each shield is a pain. I have not got DHCP working (yet), so why not using the SD card on the shield for configuration data? And right on time I received a tip from Marc about MinIni: perfect, exactly what I need!

Ethernet Shield with SD card

Ethernet Shield with SD card

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First Steps with the Freescale TWR-K64F120M

Naturally, I have several project ideas lingering around. No time to make them all (for now). One of it is interfacing the Raspberry Pi camera with a microcontroller. To store the images, I need plenty of RAM on the device, and so far the Kinetis microcontroller did not have that. Finally, Freescale announced the K64F120 a few months back, and my ordered TWR-K64F120M board arrived on my desk, waiting to be used: Finally I get an ARM Cortex-M4F with 1 MByte of FLASH and 256 KByte of RAM :-).

TWR-K64F120M Box

TWR-K64F120M Box

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IoT: FreeRTOS Down to the Micro Amps

University research projects can be a lot fun, and are very challenging the same time. The good thing is that there is always someting new to learn :-).

This week-end I was working on my Internet of Things (IoT) project, based on a Freescale KL15Z and a nRF24L01+ transceiver. In essence it is a wireless data logger. For this, I only can afford a few micro amps consumed by the whole board over an extended period of time. I mean 21 micro amps for running a whole board with sensor, EEPROM, wireless transceiver, operating system and an ARM Cortex-M0+ ready to crunch numbers at 20 MHz 🙂

21 micro amps for wireless sensor node

21 micro amps for wireless sensor node (when not sending)

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FRDM with Arduino Ethernet Shield R3, Part 3: Embedded Web Server

This is Part 3 of an ongoing tutorial to use the Arduino Ethernet Shield R3 with a Freescale FRDM-KL25Z board (or any other board you like).

In Part 1 I worked on the SD card, in Part 2 I have added basic network connection. Now time to run a web server with my FRDM-KL25Z :-). With this, I can get access to my board through the network, and the board will host a web page where I can do pretty much everything: showing status, or adding functions to turn on things like an LED 🙂

Web Server with W5100 on FRDM-KL25Z

Web Server with W5100 on FRDM-KL25Z

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FRDM with Arduino Ethernet Shield R3, Part 2: Ping

In Part 1 of this series I have covered the SD card on the Arduino Ethernet shield. In Part 2 I’m hooking up the board to the network and will be able to ping it 🙂

Arduino Ethernet Shield with FRDM-KL25Z

Arduino Ethernet Shield with FRDM-KL25Z

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FRDM with Arduino Ethernet Shield R3, Part 1: SD Card

Sometimes it takes a very long time to realize a project. Adding the Arduino Ethernet Shield R3 to one of my Freescale FRDM boards is one of it: it took me a year until I have found a few days to work on using the Ethernet Shield with my FRDM-KL25Z.

FRDM-KL25Z with Ethernet Shield

FRDM-KL25Z with Ethernet Shield

I have not everything in place yet, so I decided to publish things in parts. So this is about part one: using the Micro SD Card on the Shield.

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Tutorial: Ultra Low Cost 2.4 GHz Wireless Transceiver with the FRDM Board

For my embedded systems lecture I need a wireless connection to the robot we will develop during that course. So far I have SMAC (IEEE802.15.4) and Bluetooth worked out. But that IEEE802.15.4 (ZigBee) is expensive, and the cheap Bluetooth modules are great for robot-to-host connection, but not for swarm robots which need to communicate to each other. Alex Vecchio (see this post) pointed me to a $2.75 (!) wireless module featuring the Nordic Semiconductor nRF24L01+. Exactly what I needed, with an incredible low price :-).

nRF24L01+ Module Detail

nRF24L01+ Module Detail

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