7 years ago.

Support for FRDM K20D50M?

Hello, I have a FRDM-K20D50M board. I noticed that there was a post about the FRDM-K20D50M being "in progress" about 4 months ago, but the board is not listed on page with available platforms. Any updates on this? I am a complete newbie with mbed so I'm not sure how much I can help if there is still testing and QA that needs done for this platform. If anyone has information on this please let me know.


3 Answers

6 years, 10 months ago.

It is available in Beta form here:


(You can add the target here)

However its not fully functional yet.

At time of writing, the UART's aren't correct, UART_1 will not work as it is linked to the SDA chip for debug output (you can remove R5 and R6 if you want to use but will disable PCprint function. UART_0 is available and works on PTD7(tx) and PTD6(rx), but not shown on the overview pin outs. UART_2 does not work.

Good news, RTC works as it should with a 1.8v - 3.8v back up cell connected on J15 (Vbat) and Gnd (after cutting the track link on the bottom of the PCB). Keeps time with main power down.

Paul, if there's any bug in k20 hal sources, report it on mbed github repo.

posted by Martin Kojtal 15 Sep 2014
7 years ago.

It should work building from the github, but that isn't that straight forward for a new user. It should completely work, only some pin options should be added, but that has never stopped boards from being added before. Going to irritate Martin, he should know :)

We will look at this target.

posted by Martin Kojtal 08 Jul 2014

I did the same thing as user Marc Marc - I went ahead and bought the KL25Z just to get started, but I'm still interested in seeing if they're going to add the FRDM-K20D50M to the list of platforms. Thanks!

posted by James Rice 04 Aug 2014
7 years ago.

I also would like to have the FRDM-K20D50M added to the mbed platform. For the moment I can only stare at the board. Lucky to have bought a KL25Z and KL05Z with it so I can play with mbed.