Using the DHT11/DHT22 Temperature/Humidity Sensor with a FRDM Board


For a home automation project I need to know the room temperature and humidity percentage of the room air. Adafruit has an inexpensive DHT11 sensor from http://www.aosong.com which I decided to use for that project.

Test Setup for DHT11 Sensor

Test Setup for DHT11 Sensor

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Altium File for Freescale FRDM-K25Z Board


If you are designing your own board for the Freescale FRDM boards, then having the matching PCB design files is a good thing to have. I have posted this week an Altium contribution on GitHub for the FRDM headers (see “FRDM-KL25Z Arduino Headers with Altium“). And here there is yet another contribution I received from [Darren]: the FRDM-KL25Z board in Altium :-):

FRDM-KL25Z in Altium

FRDM-KL25Z in Altium

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Command Line Programming and Debugging with GDB


Eclipse with GDB is great: it comes with a graphical front end for debugging. But sometimes it is all about to download a program. Is it really necessary to launch an IDE like Eclipse to program or quickly debug a board? With the GNU Debugger (GDB), the answer is ‘no': GDB comes with a command line debugger which is designed exactly for this: providing a command line interface for programming/downloading and debugging, bypassing any GUI (Graphical User Interface).

Combination of GDB Debugging Probes and Boards

Combination of GDB Debugging Probes and Boards (P&E, Segger and FRDM-KL25Z)

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OpenOCD/CMSIS-DAP Debugging with Eclipse and without an IDE


OpenOCD is an open source and free-of-charge debugging solution, which is a great option here at the University of Lucerne, as students do not need to buy an expensive debugging probe. Still, I recommend to buy professional probes like the P&E or Segger ones, as they are worth every (Euro) cent. But for a ‘zero’ budget, OpenOCD with CMSIS-DAP is something to consider. And with Kinetis Design Studio using the GNU ARM Eclipse Plugins, OpenOCD is not that hard to be used. And because both Freescale and GNU ARM Eclipse offer OpenOCD Windows binaries, that connection method is in the reach of Windows users too.

FRDM-KL25Z with OpenOCD Debug

FRDM-KL25Z with OpenOCD Debug

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McuOnEclipse Components: 22-Mar-2015 Release


There is a new release of the McuOnEclipse components available on SourceForge, with the following main changes:

  1. Shell: Fixed and improved history handling.
  2. MinIni: Option to select local/stack or global memory for buffers
  3. FreeRTOS: Ability to use the tick counter instead of dedicated timer for performance measurement.
  4. FSL_USB_Stack: Added deinitialization for USB stack.
  5. FatFsMemSDHC: added custom card detection and write protection pin handling.
  6. Multiple Bug Fixes
SourceForge McuOnEclipse

SourceForge McuOnEclipse

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Attaching to a Running Target with Segger J-Link, GDB and Eclipse


This happens several times for me: I have a board running for a while (even for days), and then it crashes or is stuck somewhere. Yes, I usually use a watchdog do recover from that situation. But it would be good to know and debug the problem. With CodeWarrior I had the functionality in the debugger to ‘attach’ or ‘connect’ to a running (stuck/crashed) board. However, with Eclipse/Kinetis Design Studio/GDB this is a different debugger, and not possible. At connection time with the debugger the target does a reset, so I don’t know any more where the application crashed. But now I have a solution, at least with the Segger GDB :-).

Debug Hard Fault Attached Target

Debug Hard Fault Attached Target

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