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Konekt Dash Hardware Update: A Flexible New Secondary MCU

/ Written By Daniel D Lindmark

Hello again backers!

We have some exciting updates about the Konekt Dash and Dash Pro to share with you!

Konekt Dash Hardware Update: A Flexible New Secondary MCU

More changes to the Konekt Dash based on what YOU told us!

The biggest change we’ve made has been based on your feedback and concerns about reducing data consumption to make your data plans last longer. The side-effects and added benefits are really cool and I’d like to walk you through all of them.

Freescale MKL17Z256VFM4: The New Bootloader

We’ve changed our secondary MCU from a Nuvoton Mini54TAN to a Freescale MKL17Z256VFM4. The purpose of the chip was to act as a bootloader to the main MCU and contains the code to load firmware through the USB connector.

One major benefit is that it allows your code to take up the whole MCU without having to worry about the two different firmwares interfering with each other. This is the same as a software program keeping functions in two different classes. What this means (practically) is that you can set up a hardware timer or interrupt and not have to worry that it will interfere with your cellular data.

Konekt Dash Hardware Update: A Flexible New Secondary MCU

More Simplicity In M2M Communication And Firmware Updates

We’ve changed the order of the chip to place it in-between the main MCU and the cellular modem. This is big. Instead of providing libraries that you compile and then place on your MCU, the cellular communication libraries and over the air updates (OTA) all live on the secondary MCU. We’ve dramatically simplified the complexity needed to talk to the cellular device and now you don’t have to download the code every time you change your firmware. If you’re using OTA updates, this means you use less data to update your firmware, allowing you to be more flexible. We’ve also added flash to store firmware. This means you can store versions of the firmware and switch back to them without having to re-download them. If you need to install a debug update, you can revert back to the main firmware without paying for it twice!

Flexible, Harder to Brick And, Well, Awesome

Another reason this helps you is that the primary MCU is now more flexible. If you use our files to make your own hardware, you can change the MCU to one of your choosing and only need to change the serial drivers. The data is still the same, no matter what device you use.

The final thing that helps you out is that this makes the device much harder to brick. By having a secondary MCU that takes care of bootloading, you can write the most abusive code and we’d still be able to reset the main MCU and reprogram new code. If you’ve ever written an infinite loop with all interrupts turned off and no access to reset, you’ll know what I’m talking about.

Konekt Dash Schedule Update

The updates that we’ve made have pushed back the schedule. We think that these changes are worth the extra development time. Although we’re making another round of prototypes, we think that the reduction in OTA data and simplification of the API are big, big wins. The very nature of crowdfunding means that we get to listen to your wants and needs and make balanced tradeoffs in the design.

We’ve submitted our BOM for procurement so the parts will be ready for our pilot build. We’re still planning to have the parts ready for an August build, but we think this will get pushed back to September in order to debug the new changes in the board and to make sure the new bootloader is tight. The last thing we would want is to ship hardware that can’t reliably be updated remotely, so we will be doing our diligence and testing the new firmware.

We’re in the middle of a closed Alpha and all of the performance and feedback has been great. Watching someone get a cellular “Hello World” app up and running in minutes without special libraries has been really gratifying. I can’t wait to see how you all change the world once you get these boards in your hands.

If you’re interested in participating in our beta, we will be shipping out units in the late June early July time frame.

Join the Hardware Discussion! 

You can find another version of this update on the Konekt Community Support page as well. Please feel free to jump into the hardware discussion thread and give us your feedback – we want to hear (more) from you, so jump in and tell us what you think about all of this! (You can also feel free to comment directly on this post.)

Konekt Dash Hardware Update: A Flexible New Secondary MCU

Check Out Our Online Store! (Dash Beta Kits Available)

We’ll be adding some awesome new items to the Konekt storefront very soon. Take a look at what’s currently available!

Konekt Dash Hardware Update: A Flexible New Secondary MCU

 


If you’re reading this and thinking, “uh… what’s the Konekt Dash?” don’t worry! You can get the complete scoop on the official Konekt Dash Cellular Dev Kit Kickstarter page!

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