Marco Merlini

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7 years, 2 months ago.

How to perform direct register accesses?

For a class I am in, we must program the K64F board using direct register accesses; that is, no high-level libraries.

Technically I could open the reference manual and look up the addresses of each and every register I need to configure, but is there a better way?

When using Kinetis, there is a file called MK64F12.h which has macros for all the register accesses. However, it is part of a bigger library and impossible to use by itself.

How could I do baremetal (i.e. direct register access) programming using the mbed compiler?

Question relating to:

Last updated: 27 Aug 2020
The Freedom-K64F is an ultra-low-cost development platform for Kinetis K64, K63, and K24 MCUs.

2 Answers

Toyomasa Watarai
7 years, 2 months ago.

I believe you can still use macros in the MK64F12.h header file.

https://developer.mbed.org/users/mbed_official/code/mbed/file/176b8275d35d/TARGET_K64F/TARGET_Freescale/TARGET_MCUXpresso_MCUS/TARGET_MCU_K64F/device/MK64F12.h

Accepted Answer

I'm not sure how to use this. I tried importing, but it still doesn't recognize the register names in my code (gives me undefined identifier errors). How would I use this file?

posted by Marco Merlini 14 Feb 2017

I've just now realized that this is a different K64F12.h file from the one used in Kinetis. The way to use the macros is different

posted by Marco Merlini 14 Feb 2017

That file is automatically included in mbed by the way, you don't need to import or include anything. And it works the same for each mbed target (of course with different register names, but the C++ style register addressing is used for all).

posted by Erik - 14 Feb 2017
Tedd OKANO
7 years, 2 months ago.

This discussion may help you ;)
https://developer.mbed.org/forum/mbed/topic/2866/

So I have no choice but to use the memory addresses?

posted by Marco Merlini 13 Feb 2017

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posted by bill luise 28 Sep 2017