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Using the Reset Button on the Freedom Board as User Button
Processor Expert is a great tool: it lets me configure all the complexities of that ARM Cortex-M0+ core. But today it has fooled me and I lost several hours of my week-end time . I need a user...
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Be Aware of the Baud Problem
I’m using serial communication in different flavors for my project: with the shell, with OpenSDA USB CDC, to use printf(), and with the Bluetooth module. Processor Expert is a big helper, but as for...
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Skipping Breakpoints
The challenge with small microcontroller like the ARM-Cortex-M0+ is that they have very limited debugging resources. As such, the number of hardware break points is very limited (see this post). For...
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DAC Example with the Freedom Board
After working on an ADC example, a DAC one was missing. Julio E. Fajardo is a reader of this blog, and he was so kind to send me an example project for the FRDM-KL25Z. The example is able to produce …...
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Freedom Logic Analyzer with Triggers
The first FRDM-KL25Z Freedom Logic Analyzer firmware was missing one important feature: Triggers! But this weekend the firmware has evolved a bit . Triggers Currently up to 8bits are supported, and...
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USB MSD Host for the Freedom Board
Sometimes things take longer than anticipated. And this is definitely the case for my USB MSD Host project where I wanted to use a USB memory stick with the Freedom FRDM-KL25Z board. But finally, I...
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Pololu Line Following Robot with Freedom Board
Because my first line following robot was this week at the Embedded World conference in Nürnberg, I have constructed another one around the Freedom FRDM-KL25Z board. It is based on Pololu part items...
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mbed for the Freedom Board
I knew about mbed already for some time: watching students using it for an NXP enabled board. Pretty cool stuff: mbed is an online IDE and compiler with tons of software libraries for the supported...
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Tutorial: PWM with Processor Expert
For many of my applications I’m using a PWM (Pulse Width Modulated) signal. One example is the motor driver used in this project where I use one PWM signal for each motor. Another usage of PWM is to...
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Freedom Robot solves the Maze
Finally I have found some time over the past week-end to enhance my Zumo robot. After I had my line following robot based on the Pololu Zumo chassis and the FRDM-KL25Z, I thought it should be easy and...
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Freedom Logic Analyzer with DMA
The FRDM-KL25Z Open Source Logic Analyzer based on SUMP presented here was already very useful with the added trigger support. But it was not capable to do a sampling rate above a few hundred kHz....
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Maze solving FRDM-KL25Z Robot goes backward for Dead-Ends
The maze solving robot based on the Freedom FRDM-KL25Z and Pololu Zumo shield has new features: For dead-end paths, instead turning around, the robot is driving backward Higher speed for going...
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Tutorial: Creating a Processor Expert Component for an Accelerometer
If you are a frequent reader of this blog, then you know: I’m a big fan of Processor Expert components. While there are many Processor Expert components delivered with CodeWarrior, it lacks many...
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Extended Driver for the MMA8451Q Accelerometer
In “Tutorial: Accelerating the KL25Z Freedom Board” I used the MMA8451Q accelerometer on the FRDM-KL25Z board in a very primitive way: I’m reading directly some low-level registers from the device...
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printf() with the FRDM-KL25Z Board and without Processor Expert
In this tutorial I explored how to use printf(), and this tutorial is so generic that it works for any processor/microcontroller. That flexibility is because I’m using Processor Expert. In case...
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Red Suite 5: Eclipse Juno, Processor Expert and unlimited FRDM-KL25Z
You probably know this already: I’m a fan of Eclipse, Processor Expert and the Freedom board. As for tool chains I use CodeWarrior for MCU10.x (Eclipse based, 64 KByte free limit) and IAR (32 KByte...
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Using the Freedom Board as JTAG Programmer
I love the Freescale Freedom boards because they are low-cost, and I do not need a special debug device, as they have the on-board OpenSDA. It is using a small Kinetis-K20 which acts as JTAG debugging...
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Debug External Processors with USBDM and Freedom Board
Teaching at a university means to work in a very special environment. What students love is ‘Open Source’: because it allows them to ‘see’ things and learn from the technology. The other thing is:...
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Serial Bootloader for the Freedom Board with Processor Expert
Bootloaders are a very useful thing: it allows programming an application file without a debugger. This makes it ideal for upgrading a system in the field. Usually, there are application notes and...
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Can MCU10.4 recover a bricked OpenSDA Freedom Board?
Ok, this one might not work for everyone. And maybe I’m seeing a ghost. But a nice and real one, at least for me . It seems that with the new CodeWarrior for MCU10.4 installation I was able to recover...
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