Monthly Archives: April 2014

Segger J-Link Firmware for OpenSDAv2

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Segger just has released their OpenSDAv2 firmware. The OpenSDAv2 firmware is different from the OpenSDAv1 as it is using a different memory map and bootloader. The OpenSDAv2 e.g. is present on the new FRDM-K64F board. The availability of the Segger firmware is definitely good news for any owner of the FRDM-K64F board: so far only the CMSIS-DAP firmware was available (on top of the mbed bootloader). With this, it was not possible to use the board with CodeWarrior, except with using an external P&E Multilink or Segger J-Link. With that new Segger J-Link OpenSDAv2 firmware, I can now use the FRDM-K64F with any IDE which supports the Segger J-Link :-).

FRDM-K64F with Segger OpenSDAv2 Firmware

FRDM-K64F with Segger OpenSDAv2 Firmware

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JoyStick Shield with the FRDM Board

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The latest addition to my set of Arduino shields is a true fun thing: The ElecFreaks.com JoyStick Shield 🙂

ElecFreaks.com Joystick Board with FRDM-KL25Z and nRF24L01+

ElecFreaks.com Joystick Board with FRDM-KL25Z and nRF24L01+

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FRDM with Arduino Ethernet Shield R3, Part 4: MinIni

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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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The Turbo Encabulator

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At the university the mid-term presentations are due. Which reminds me about the importance to use the right terms and keywords not only for scientific presentations and abstracts, but as well to use and know the correct terms in any presentation or documentation. A have been pointed to an interesting concept: The Turbo Encabulator, described in this data sheet:

Turboencabulator

Turboencabulator

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Binary (and S19) Files for the mbed Bootloader with Eclipse and GNU ARM Eclipse Plugins

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The existing OpenSDAv1 (see “OpenSDA on the Freedom KL25Z Board“) bootloader is using the industry standard Motorola S-Record (S19) Files. However, new FRDM-K64F board (see “FTF: FRDM-K64F, Kinetis Design Studio and Kinetis SDK“) has OpenSDAv2 on it, which is an mbed bootloader. So how to create files with an IDE other than mbed for that bootloader which is present on the FRDM-K64F board by default? Well, creating binary files is one thing, but to have it working with the mbed bootloader is another challenge :-(.

FRDM-K64F with mbed MSD bootloader

FRDM-K64F with mbed MSD bootloader

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Using the FRDM-K64F with CodeWarrior

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The new flagship of FRDM boards is the FRDM-K64F board. After FTF I have explored different ways debugging the board, and received many comments and questions about it (thanks!). Freescale announced the supports with the new Eclipse based Kinetis Design Studio (KDS). But until KDS is out, how can I use the FRDM-K64F board with CodeWarrior?

Debugging FRDM-K64F Board with CodeWarrior for MCU v10.6

Debugging FRDM-K64F Board with CodeWarrior for MCU v10.6

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Recovering FRDM-K64F mbed Board

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The mbed for FRDM-K64F firmware (http://mbed.org/handbook/Firmware-FRDM-K64F) has great potential. Unfortunately it seems that edges are still very rough: It happens very  often that my FRDM-K64F board gets locked up :-(. I can see that the target CPU is constantly resetting: the red reset LED is always on:

FRDM-K64F Red Reset LED always on

FRDM-K64F Red Reset LED always on

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GNU Linker, can you NOT Initialize my Variable?

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my students sometimes are afraid to ask questions, although I urge them ask any question. In my opinion there are no ‘dumb’ questions: only questioning things let us think and learn new things. I see that many readers of this blog are *not* afraid to comment or ask questions. The WordPress statistics shows 5’687 questions/comments for this blog (thank you all!), and the spam filter protected me from 202,341 items (ok, these *are* dumb) :-).

The ‘question of the week’ comes from Andy. That question caused me some serious head scratching, but the same time I have learned something important and useful for my next project: how to tell the ARM GNU linker *not* to initialize variables?

GNU ARM Embedded Linker Options

GNU ARM Embedded Linker Options

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