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LoFive

Tiny RISC-V Microcontroller Board

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Small breadboard friendly development board using the SiFive FE310 RISC-V Microcontroller.

Specifications

  • MCU – SiFive Freedom E310 (FE310) 32-bit RV32IMAC processor @ up to 320+ MHz (1.61 DMIPS/MHz)
  • Storage - 128-Mbit SPI flash (ISSI IS25LP128)
  • Expansion - 2x 14-pin headers with JTAG, GPIO, PWM, SPI, UART, 5V, 3.3V and GND
  • Misc - 1x reset button, 16 MHz crystal
  • Power Supply - 5V via pin 1 on header; Operating Voltage: 3.3 V and 1.8 V
  • Dimensions - 38 x 18 mm (estimated)
  • License - CERN Open Hardware Licence v1.2

  • 1 × FE310-G000 SiFive Freedom E310
  • 1 × IS25LP128-JBLE 128 Mbit SPI Flash
  • 1 × SPX3819M5-L-3-3 Power Management ICs / Linear Voltage Regulators and LDOs
  • 1 × SPX3819M5-L-1-8 Power Management ICs / Linear Voltage Regulators and LDOs
  • 1 × SN74LVC1G07 Logic ICs / Gates and Inverters

View all 13 components

  • LoFive Funded!

    Michael Welling10/10/2017 at 20:45 0 comments

    If you haven't heard the LoFive group buy at groupgets.com was successfully funded!

    We have over 250 units on order.

    Thanks for all of the support and I can't wait to see all of the LoFive based projects.

    For anyone that missed this first round, we are looking into making these boards available on the GroupGets store with more shipping options. Check back for information after the first round of boards go out.

  • Want a board?

    Michael Welling09/07/2017 at 03:21 3 comments

    Decided to post a group buy campaign to release a few of these out into the wild:

    https://groupgets.com/campaigns/353-lofive-risc-v

    Get them while they are hot.

  • LoFive is alive!!!

    Michael Welling08/29/2017 at 01:25 5 comments

    Tonight I assembled the first article of the LoFive.

    Here are a few pictures of the process.

    Pre-oven component placement:

    Fresh out of the oven:

    Few pictures of the de-panelized board:

    Comparison to the Teensy (~same form factor):

    Picture of the 16Mhz crystal jamming and power supply current:

    Next up JTAG and software tests.

    Hmmmm .. now how do I put the bootloader on there...

  • PCB panels are in!

    Michael Welling08/19/2017 at 23:15 1 comment

    So the first panels of the PCB arrived today courtesy of @oshpark.

    The rest of the components are on the way for assembly next week.

  • OSH Stencils \o/

    Michael Welling08/19/2017 at 22:13 0 comments

    Assembly begins soon.

View all 5 project logs

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Discussions

Adam Vadala-Roth wrote 08/29/2017 at 03:10 point

very awesome michael!!!! Is it easy to get samples of the chip?

  Are you sure? yes | no

Michael Welling wrote 08/29/2017 at 20:04 point

Not too bad. I just had to create the design and ask nicely.

A finished design helps.

  Are you sure? yes | no

Anders Dam Kofoed wrote 08/20/2017 at 16:39 point

Cool project. I have their first board. 

Can we buy these fully assembled from you? If yes, what price?

  Are you sure? yes | no

Michael Welling wrote 08/20/2017 at 17:03 point

I haven't assembled any quite yet. That is coming up next week. I will post when/if they are available.

  Are you sure? yes | no

Stephen Newberry wrote 08/20/2017 at 01:51 point

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.

  Are you sure? yes | no

Michael Welling wrote 08/20/2017 at 17:12 point

I think that it is still a little early for public availability.

  Are you sure? yes | no

Stephen Newberry wrote 09/06/2017 at 01:00 point

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!

  Are you sure? yes | no

arnaud.durand wrote 08/20/2017 at 00:32 point

Where do you source FE310 MCUs? I cannot find any supplier (if we omit desoldering from HiFive1).

  Are you sure? yes | no

Michael Welling wrote 08/20/2017 at 01:18 point

Engineering samples only for now.

  Are you sure? yes | no

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