Tag Archives: Tips&Tricks

About things you might not know, or could make your life easier.

Low-Level Coding with PDD (Physical Device Driver)

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As with any software drivers: they are never perfect. The same applies to the Processor Expert components delivered in CodeWarrior for MCU10 or the DriverSuite too. That’s why I have created many more components which are available on GitHub here. All these components are using other components to reach the hardware. But what if a functionality is not exposed through the low-level component? Or what if I want direct access to the hardware? Up to now I had to choose either the Processor Expert way, or to do it in the ‘traditional’ way using an SDK like CMSIS or vendor supplied header files.

With MCU10.4, I noticed that there is another way: PDD (Physical Device Driver).

PDD in the Components View

PDD in the Components View

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Adding/Removing Floating Point Format for S08 Projects

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Usually I do *not* use floating point numbers in my projects. For this, I select ‘None’ during the project creation in CodeWarrior for MCU:

No Floating Point Selected

No Floating Point Selected

But what if I need to change my mind later? How to change such a ‘no-floating-point-needed’ project to one with floating point format support?

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Adding USBDM to CodeWarrior for MCU10.4

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If you are following my recent posts, then you know I started using USBDM on OpenSDA as an alternative run control solution. Now with the advent of MCU10.4, the question is: how to use USBDM with it, because the USBDM installer obviously only knows the version up to MCU10.3?

USBDM 4.10.4a Installer

USBDM 4.10.4a Installer

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Can MCU10.4 recover a bricked OpenSDA Freedom Board?

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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 a bricked OpenSDA FRDM-KL25Z board :shock:

Recovered OpenSDA Board

Recovered OpenSDA Board

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Switching Processor Package – Simplified in MCU10.4

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I continue to uncover new things in CodeWarrior in MCU10.4 :-) . Remember my post “Switching Processor Package in Processor Expert” about the steps needed to switch from one microcontroller package to another? Although that’s not something I need to do on a daily base, this process is simplified in the new version 10.4 :-)

Select Package

Select Package

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USB CDC with the FRDM-K20D50M

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Good news for everyone owning the FRDM-K20D50M board: I have extended the FSL_USB_Stack with USB CDC device class support for the K20D50M :-) .

USB CDC Test Application with the FRDM-K20D50M

USB CDC Test Application with the FRDM-K20D50M

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Debugging FRDM-KL05Z with USBDM

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I mentioned in “Debug External Processors with USBDM and Freedom Board” post that I had a problem to debug the FRDM-KL05Z with USBDM. Well, after a long night with some sleep, with more thinking and searching, finally I have it resolved: I can debug my FRDM-KL05Z with USBDM :-)

FRDM-KL05Z Debugging with USBDM

FRDM-KL05Z Debugging with USBDM

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Debug External Processors with USBDM and Freedom Board

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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: students have a low budgets, so they appreciate if they can use inexpensive or low-cost hardware and software. The FRDM-KL25Z Freedom board for sure meets that low price, and no extra programming device needed.

Now they are building their own boards, and they wish to program and debug it. They can borrow the Segger J-Links and P&E Multilinks we have available at the university. But why not use the Freedom board as ‘hobby’ debug and programming solution? As explored in “Using the Freedom Board as SWD Programmer“, they can use the default factory installed OpenSDA to program another microcontroller of same type. But not to debug it.

While writing the ”Using the Freedom Board as SWD Programmer” article, I was looking into USBDM. USBDM has added in January 2013 support for OpenSDA. But at that time, it was somehow not working for me, and I had not enough time to find out what the problem was. Time to get that fixed. Good news: With help and tips from the USBDM community, I have it finally working :-)

USBDM Debugging another FRDM-KL25Z

USBDM Debugging another FRDM-KL25Z

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printf() with the FRDM-KL25Z Board and without Processor Expert

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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 Processor Expert shall not be used, then some tweaks are needed. Here I show what is needed to have printf() working with the FRDM-KL25Z board. I use the UART0 connected to OpenSDA USB CDC for this.

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