Tiny RISC-V Microcontroller Board
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Specifications
We are doing a second round of the LoFive R1 campaign:
https://groupgets.com/campaigns/812-lofive-r1-round-2
With some help from GroupGets, we now have LoFive R1 stocked at Digikey.
https://www.digikey.com/product-detail/en/groupgets-llc/LOFIVE-R1/2077-LOFIVE-R1-ND/10186935
https://groupgets.com/campaigns/533-lofive-r1
The new FE310-G002 provides I2C and a second UART. Lets you add all of those sensors and wireless co-processors. Get one while the campaign lasts for $24.99.
Been kicking around some stretch goals for the campaign. Add some ideas in the comments if you have something worth adding to the campaign.
After quite a long break, LoFive is back with a new revision. LoFive R1 uses the new FE310-G002 processor which provides I2C and an additional UART.
Got the first article built up and everything appears to be working so far.
Next step is more thorough testing followed by a new campaign on GroupGets.
Today Miodrag Milanovic got an initial port of Micropython running on LoFive.
https://twitter.com/micko_mame/status/965213234679738368
This might become the new deploy firmware.
Check out this awesome robot using LoFive:
https://hackaday.io/project/28930-lofive-riscbot
The second round of funding is still up for anyone that wants to one up Kurt. :)
The product listing on Tindie has been retired while the second round of the campaign is running.
If you want to get a LoFive join the campaign on GroupGets.
https://groupgets.com/campaigns/376-lofive-risc-v-round-2
It may be relisted on Tindie after the second round is complete. I don't want people to waitlist on Tindie instead of just joining the new GroupGets campaign.
LoFive is back for another round of funding on GroupGets.
So the LoFive campaign is over but you can still get one if you hurry.
GroupGets posted their spare units to their store here:
LoFive RISC-V on GroupGets Store
I also decide to post a few of the spare units from the early run on Tindie here:
All of the LoFive orders are now shipped and they are starting to show up in the wild.
https://twitter.com/beriberikix/status/934620025180143616
Basic documentation was started on the Github wiki for the LoFive.
https://github.com/mwelling/lofive/wiki
The wiki references the LoFivified Freedom-E SDK which is also hosted on Github.
https://github.com/mwelling/freedom-e-sdk
As support questions roll in, I will create a FAQ and update the documentation as required.
In other news, LoFive was OSHWA certified. This is a self certification so if anyone see areas that are lacking in terms of the certification please tell.
Thank you everyone for supporting this project!
Hello, I ported the Espruino, Javascript for microcontrollers, to the HiFive1 that uses the same MCU the FE310. Maybe it's interesting for LoFive. Check it out: https://github.com/microhobby/Espruino
It looks like the input to U5 (the SN74LVC1G07 buffer for JTAG_TRST_N is floating. What prevents it from floating low and triggering a reset? With the high input impedance of this chip, it seems like you could trigger this by just putting one finger on this pin and another on GND.
Depends on what you are using to drive the JTAG. If you use the dual FTDI it works without a pull-up. But when I used the PocketBeagle to jam the JTAG, I had to pull the line up to 3.3V with an external resistor.
Oh you mean when the JTAG is not connected. It is open drain.
The output is open drain, but what about the input of U5? Can't that drift low, which would force the output low as well?
very awesome michael!!!! Is it easy to get samples of the chip?
Not too bad. I just had to create the design and ask nicely.
A finished design helps.
Cool project. I have their first board.
Can we buy these fully assembled from you? If yes, what price?
I haven't assembled any quite yet. That is coming up next week. I will post when/if they are available.
Very nice. I really wanted to get a project going using this chip, so I emailed sifive at their listed email address to ask about availability. This was almost two months ago... still unanswered. Looking forward to seeing how this goes.
I think that it is still a little early for public availability.
Just an update - I did receive a reply from the company and they will be available soon on CrowdSupply. I didn't want anyone reading this to be misled - thanks for sharing your design!
Where do you source FE310 MCUs? I cannot find any supplier (if we omit desoldering from HiFive1).
Michael Welling
vysocan76
NuclearPhoenix
Stefan Kremser
Jeremy
After some googling I found the following guide explaining how you can use your J-Link with this board:
https://wiki.segger.com/GroupGets_LoFive_R1_1
I hope this is useful for some of you.