Cycle Counting on ARM Cortex-M with DWT


Some ARM Cortex-M have a DWT (Data Watchpoint and Trace) unit implemented, and it has a nice feature in that unit which counts the execution cycles. The DWT is usually implemented on most Cortex-M3, M4 and M7 devices, including e.g. the NXP Kinetis or LPC devices.

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McuOnEclipse Components: 28-Jan-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:

  • New Sharp Memory Display Driver supporting 96×96 and 128×128 pixel ultra low power display
  • PID_Int can be used without hardware
  • GenericTimeData has added functions to convert date/time into strings
  • HardFault can now disable write buffers on ARM Cortex to simplify debugging faults
  • Folder support for SEGGER SystemView and Percepio FreeRTOS+Trace
  • Component usage without Processor Expert
  • NXP MCUXpresso SDK support for FreeRTOS using tickless idle mode and low power timer
  • Many other smaller bug fixes and enhancements
SourceForge

SourceForge

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Upgrading to Sharp 128×128 Pixel Memory Display


In “Low Power LCD: Adafruit Breakout Board with Sharp Memory Display” I used a 96×96 Sharp Display (LS013B4DN04) with the Adafruit breakout board, but because that one seems to be EOL (End Of Life), I searched for a replacement. I have found the 128×128 pixel version (Sharp LS013B7DH03), and best of all, it is pin compatible :-). With a small tweak of the driver, it works :-):

Sharp Memory Display 128x128

Sharp Memory Display 128×128

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Disabling EzPort on NXP Kinetis to Solve Power-On Issues


I’m using the NXP FRDM-K64F board in several projects: it is reasonably prices, has USB, Ethernet, micro SD card socket and connectors for Bluetooth classic and Nordic Semiconductor nRF24L01+ 2.4 GHz transceiver:

NXP FRDM-K64F Board

NXP FRDM-K64F Board

But one issue I have faced several times is that the board works fine while debugging and connected and powered by a host machine, but does not startup sometimes if powered by a battery or started without a debugger attached. I have found that the EzPort on the microcontroller is causing startup issues.

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McuOnEclipse Components: 12-Dec-2016 Release


Time is passing by so fast, and the year end is approache fast! I’m pleased to announce that a new release of the McuOnEclipse components is available in SourceForge:

  • Percepio Trace V3.1 for FreeRTOS which includes both Segger RTT continuous streaming and snapshot tracing in a single API
  • Generation of sources and drivers so they can be used without Processor Expert using McuLibConfig, removal of dependency to NXP Kinetis SDK: components use a generic API approach to have them working with other SDKs.
  • New contributed ExceptionsHandler component
  • Callback Setter and Getter in USB CDC stack for simpler option handling
  • GenericTimeDate with flexible RTC support and added Unix Timestamp functions
  • LongKey events in Key component
  • FreeRTOS with optimized task selection on Cortex-M4/M7
  • Many smaller bug fixes and enhancements
SourceForge

SourceForge

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NXP MCUXpresso Software and Tools with Clocks Tool


About a year ago, on December 7th 2015, Freescale and NXP have announced the completion of their merger.  Now it is Qualcomm which wants to acquire NXP? It looks like these mergers are happening faster and faster. The reality is that merging products take more time than anticipated, and nearly one year later I can see the outcome of what comes out of the marriage between Freescale and NXP or between Kinetis and LPC: NXP has announced the MCUXpresso software and tools for Kinetis and LPC microcontroller:

Introducing MCUXpresso

Introducing MCUXpresso (Source: NXP video)

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McuOnEclipse Components: 30-Oct-2016 Release


A new McuOnEclipse components release was long overdue, so I’m pleased to announce that a new drop is available with the following major changes:

  • Segger SystemView library with kernel time reporting
  • GenericTimeDate supports different hardware RTC devices
  • Utility with little endian packet handling functions
  • Shell Standard I/O handlers for USB CDC, Segger RTT and Bluetooth
  • FreeRTOS and stack size reporting
  • printf() support in Shell component
  • Various small bug fixes and improvements
SourceForge

SourceForge

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Tutorial: RFID Tags with the NXP NFC Controller PN7120 and Eclipse


Playing with RFID and NFC is definitely fun :-), and they are everywhere! For a research project I’m exploring different RFID tags and solutions. I several types around for a long time, but never found the time to actually work on it, so last nightI thought I give it a try, and I have it working with GNU ARM and Eclipse, powered by the NXP FRDM-K64F board 🙂

NXP NFC PN7120S

NXP NFC PN7120S with a FRDM-K64F Board

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Tutorial: Blinky with Kinetis SDK V1.3 and Processor Expert


This tutorial goes through the steps how to create a blinking LED application, using Kinetis SDK and Processor Expert, using the TWR-KL43Z48M board from Freescale (now NXP):

twr-kl43z48m

twr-kl43z48m

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FatFS with Adafruit MicroSD Breakout Board and NXP FRDM-KL25Z


Breakout boards are great: they allow me to explore functions quickly, without to build my custom board: all what I need is some wires and ideally a bread board.

Adadfruit MicroSD Card Breakout Board

Adadfruit MicroSD Card Breakout Board

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Switching the Microcontroller Package, Device and Family


One of the major benefits of Processor Expert is that I can easily switch the device or processor used in a project. For example I can do my concept with a larger device with more FLASH and RAM, and then at the end easily switch to a smaller or even completely different device very quickly. For example I have a project working with the 64KByte FLASH version of the KE02Z (KE02Z68VLH2):

MKE02Z64VLH2

MKE02Z64VLH2

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First steps: ARM Cortex-M7 and FreeRTOS on NXP TWR-KV58F220M


For a university research project I need a fast microcontroller with lots of RAM and FLASH memory. I have ordered a TWR-KV58F220M board from NXP which arrived yesterday. The special thing is that it has on of these new ARM Cortex-M7F on it:

TWR-KV58F220M Box

TWR-KV58F220M Box

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INTRO FS2016 Semester Closing with Robot Maze Challenge


“Learning-by-doing” is one of the core principles of my embedded systems and robotics course at the Lucerne University. For this the students apply what they learned using a robotics platform. In earlier semesters we did a Sumo battle at the end. This time the challenge was to build a remote controller plus to add the ability to explore and solve a line maze:

maze solving robots

maze solving robots

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McuOnEclipse Components: 29-May-2016 Release


Major changes in this new release:

  • FreeRTOS V9.0.0 with static memory allocation.
  • Shell with single character I/O function.
  • FatFS File System with extra shell commands for memory dump and file creation.
  • Segger SystemViewer library updated to V2.36a
Segger SystemViewer V2.36a

Segger SystemViewer V2.36a

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FreeRTOS V9.0.0 with Static Memory Allocation


I’m using FreeRTOS in most of my applications. There were only a few exceptions where an RTOS has to be used in safety critical systems: there usually it is not permitted to use any dynamic memory allocation because this adds the risk that a memory allocation could fail at runtime because of memory fragmentation or memory leak. And FreeRTOS uses a dynamic memory (heap) for the task stacks and the RTOS resources including semaphore, mutex and queues.

This is now a thing of the past. This week a new FreeRTOS Version 9 was released which does not need any dynamic memory allocation anymore: it is possible now to build completely statically allocated systems with FreeRTOS :-).

Dynamic and Static Memory Allocation in FreeRTOS V9.0.0

Dynamic and Static Memory Allocation in FreeRTOS V9.0.0

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Tutorial: FreeRTOS with NXP Kinetis SDK V2.0 and Processor Expert


In “Tutorial: Blinky with NXP Kinetis SDK V2.0 and Processor Expert” I used Processor Expert components with the NXP Kinetis SDK to blink some LEDs. This tutorial extends the earlier project and adds FreeRTOS.

FreeRTOS running on a NXP FRDM-K22F Board

FreeRTOS running on a NXP FRDM-K22F Board

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Tutorial: Blinky with NXP Kinetis SDK V2.0 and Processor Expert


In “Mother of Components: Processor Expert with NXP Kinetis SDK V2.0 Projects” I presented an approach how to use Processor Expert components with the NXP Kinetis SDK. This article is a tutorial how to create a blinking LED project with that approach, using McuOnEclipse Processor Expert components and the Kinetis SDK V2.0. As board the FRDM-K22F is used:

Blinky on a FRDM-K22F with SDK V2.0 and Processor Expert

Blinky on a FRDM-K22F with SDK V2.0 and Processor Expert

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Mother of Components: Processor Expert with NXP Kinetis SDK V2.0 Projects


Unfortunately, now the NXP Kinetis SDK V2.0 does not include Processor Expert support (see “First NXP Kinetis SDK Release: SDK V2.0 with Online On-Demand Package Builder“). But at the Lucerne University we are using more than 150 different custom Processor Expert components we would like to use with that new SDK. So how to make them working with the Kinetis SDK V2.0? Using a Processor Expert as “the mother of all components”:

NXP Kinetis SDK V2.0 and Processor Expert Side-by-Side under Eclipse

NXP Kinetis SDK V2.0 and Processor Expert Side-by-Side under Eclipse

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McuOnEclipse Components: 8-May-2016 Release


Time is passing fast, and many components have been updated to make the compatible with the NXP Kinetis SDK V2.0. As a highlight, besides of FreeRTOS the following components are now usable with the NXP Kinetis SDK:

Components compatible with Kinetis SDK

Components compatible with Kinetis SDK

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