2019-06-16 15:39:06 +00:00
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< title > Fomu: An FPGA in your USB Port< / title >
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< meta name = "author" content = "Sean "xobs" Cross" >
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< a class = "url" href = "https://p.xobs.io/td19/" > p.xobs.io/td19< / a >
< span class = "theme" > Teardown 2019< / span > < span class = "hashtag" > | #teardown2019< / span > < span class = "twitter" > |
@teardown< / span >
< / div >
< div class = "slides" >
< section >
< h2 > Fomu: an FPGA in your USB Port< / h2 >
< img src = "img/tomu-fomu-case-superwide.jpg" >
< p >
Fomu (with case): an FPGA in your USB port. Crowdfunding now! One week to go. < a href = "https://t.xobs.io/fomu" > t.xobs.io/fomu< / a >
< / p >
< / section >
< section data-background-image = "css/theme/lca2019-title-bg-transparent.svg" >
< h1 > Fomu: An FPGA in your USB Port< / h1 >
< h4 > A whirlwind introduction to Fomu and FPGAs< / h4 >
< p align = "right" >
< small > Sean Cross - < a href = "https://xobs.io/" > https://xobs.io/< / a > - @xobs< / small >
< / p >
< / section >
< section >
< h3 > Outline< / h3 >
< ol >
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< li > Fomu Firmware Layout< / li >
< li >
< ol >
< li > Bootloader< / li >
< li > Recovery< / li >
< li > Magic constants< / li >
< li > Interpreters< / li >
< li > Updates< / li >
< / ol >
< / li >
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< li > Loading firmware onto Fomu< / li >
< li > Blinkenlights< / li >
< / ol >
< / section >
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< section >
< h2 > Workshop Outline< / h2 >
< ol >
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< li > What do I need to get started?< / li >
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< li > What is Fomu, and what is an FPGA?< / li >
< li > What can I do with Fomu?< / li >
< li > What makes Fomu special?< / li >
< / ol >
< / section >
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< section >
< section >
< h2 > What do I need to get started?< / h2 >
< ol >
< li > Synthesis< / li >
< li > Place-and-Route< / li >
< li > Packer< / li >
< / ol >
< / section >
< / section >
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< section >
< section >
< h2 > What is an FPGA?< / h2 >
< p >
An FPGA is like a hardware emulator. It can change itself so that it can take on the characteristics of any other digital logic.
< / p >
< p >
FPGAs are measured in resources called LUTs or LCs.
< / p >
< / section >
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< section >
< h2 > What is Fomu?< / h2 >
< p >
Fomu is an FPGA that fits in your USB port. It has foru buttons, 2 MB of SPI flash, an RGB LED, and an ICE40UP5K with 5280 LCs. It also has 128 kB of dedicated RAM, not counting the block RAM.
Unlike many other PCBs, Fomu does not have a separate USB controller chip. This means that any projects that want to use the USB port must include a USB softcore.
< / p >
< / section >
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< section >
< h2 > Fomu Block Design Diagram< / h2 >
< / section >
< section >
< h2 > ICE40 Features< / h2 >
< / section >
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< section >
< h2 > What is this PCB?< / h2 >
< p >
This is Fomu EVT1. This is the original stretch prototype of Fomu. The schematics are the same, but much has changed:
* Name changed from Tomu-FPGA to Fomu
* Package changed from SG48 to WLCSP32
Additionally, some patches were needed to get this PCB working:
* SO-8 for SPI flash was too small
* Crystal footprint was upside-down
These are yours to take home with you!
Differences between EVT1 and EVT3:
* Silkscreen on Raspberry Pi header
* Populate Raspberry Pi header
* Add PMOD pins to touchpads
* Swap PMODa pins for I3C
< / p >
< / section >
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< section >
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< h2 > What modifications does it have?< / h2 >
< ul >
< li > Shorting out two zero-ohm resistors< / li >
< li > Programming SPI flash< / li >
< li > Bending SPI flash pins inward< / li >
< li > Mounting crystal on its side< / li >
< li > Attaching power to crystal< / li >
< / ul >
< / section >
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< / section >
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< section >
< section >
< h2 > Working with Fomu< / h2 >
< / section >
< section >
< h2 > "fail safe" bootloader< / h2 >
Using dfu
< / section >
< section >
< h2 > Updating Fomu< / h2 >
< code >
sean@PAZUZU ~\Code\Fomu\foboot\releases\v1.8.1 master ≢ [10:45]
❯
dfu-util 0.9
Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2016 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to http://sourceforge.net/p/dfu-util/tickets/
Found DFU: [1209:5bf0] ver=0101, devnum=16, cfg=1, intf=0, path="1-1.1.2", alt=0, name="Fomu DFU Bootloader v1.7.2", serial="UNKNOWN"
sean@PAZUZU ~\Code\Fomu\foboot\releases\v1.8.1 master ≢ [10:45]
❯
dfu-util 0.9
Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2016 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to http://sourceforge.net/p/dfu-util/tickets/
Match vendor ID from file: 1209
Match product ID from file: 5bf0
Opening DFU capable USB device...
ID 1209:5bf0
Run-time device DFU version 0101
Claiming USB DFU Interface...
Setting Alternate Setting #0 ...
Determining device status: state = dfuIDLE, status = 0
dfuIDLE, continuing
DFU mode device DFU version 0101
Device returned transfer size 1024
Copying data from PC to DFU device
Download [========= ] 36% 38912 bytes
Download done.
state(7) = dfuMANIFEST, status(0) = No error condition is present
state(8) = dfuMANIFEST-WAIT-RESET, status(0) = No error condition is present
Done!
sean@PAZUZU ~\Code\Fomu\foboot\releases\v1.8.1 master ≢ [10:45]
❯
dfu-util 0.9
Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2016 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to http://sourceforge.net/p/dfu-util/tickets/
Found DFU: [1209:5bf0] ver=0101, devnum=14, cfg=1, intf=0, path="1-1.1.2", alt=0, name="Fomu DFU Bootloader v1.8.1", serial="UNKNOWN"
sean@PAZUZU ~\Code\Fomu\foboot\releases\v1.8.1 master ≢ [10:47]
❯
< / code >
< / section >
2019-06-18 17:11:09 +00:00
< / section >
< section >
< h2 > Levels of Fomu< / h2 >
< p >
Fomu aims to be accessable on three levels:
< ol >
< li > Python / Interpreted< / li >
< li > RISC-V< / li >
< li > Verilog / FPGA< / li >
< / ol >
< / p >
< / section >
< section >
< section >
< h2 > Python / Interpreted< / h2 >
< ol >
< li > < strong > Goal:< / strong > Multiple interpreters, auto-reload, USB disk interface< / li >
< li > < strong > Now:< / strong > MicroPython binary< / li >
< / ol >
< / section >
< section >
< h2 > Loading Programs onto Fomu< / h2 >
< code > dfu-util -l< / code >
< code > dfu-util -D update.bin< / code >
< / section >
< section >
< h2 > Loading MicroPython< / h2 >
< code > dfu-util -D micropython.dfu< / code >
< / section >
< section >
< h2 > Connecting via serial< / h2 >
< / section >
< section >
< h2 > Interacting with Fomu< / h2 >
< / section >
< section >
< h2 > RGB LEDD reference< / h2 >
< / section >
< section >
< h2 > Future Work< / h2 >
CircuitPython, etc.
< / section >
< / section >
< section >
< section >
< h2 > RISC-V code< / h2 >
< / section >
< section >
< h2 > LiteX Machine Model< / h2 >
< / section >
< section >
< h2 > Wishbone Interface< / h2 >
< / section >
< section >
< h2 > Wishbone Bridge< / h2 >
< / section >
< section >
< h2 > Interacting with LEDD directly< / h2 >
< / section >
< section >
< h2 > Writing RISC-V Code< / h2 >
< / section >
< / section >
< section >
< section >
< h2 > Hardware Description Language< / h2 >
< / section >
< section >
< h2 > Yosys and NextPNR< / h2 >
< / section >
< section >
< h2 > Blinking an LED< / h2 >
< / section >
< section >
< h2 > LiteX and MiGen< / h2 >
< / section >
< section >
< h2 > VexRiscv< / h2 >
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< / section >
< / section >
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