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add initial python section

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Signed-off-by: Sean Cross <sean@xobs.io>
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Sean Cross 2019-06-18 15:56:54 -07:00
parent 4f50750b32
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@ -89,43 +89,37 @@
<h2>Fomu: an FPGA in your USB Port</h2> <h2>Fomu: an FPGA in your USB Port</h2>
<img src="img/tomu-fomu-case-superwide.jpg"> <img src="img/tomu-fomu-case-superwide.jpg">
<p> <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> Pre-order now on Crowd Supply! <a href="https://t.xobs.io/fomu">t.xobs.io/fomu</a>
</p> </p>
</section> </section>
<section data-background-image="css/theme/lca2019-title-bg-transparent.svg"> <section data-background-image="css/theme/lca2019-title-bg-transparent.svg">
<h1>Fomu: An FPGA in your USB Port</h1> <h1>Fomu: An FPGA in your USB Port</h1>
<h4>A whirlwind introduction to Fomu and FPGAs</h4> <h4>A whirlwind introduction to Fomu; a workshop in three levels</h4>
<p align="right"> <p align="right">
<small>Sean Cross - <a href="https://xobs.io/">https://xobs.io/</a> - @xobs</small> <small>Sean Cross - <a href="https://xobs.io/">https://xobs.io/</a> - @xobs</small>
</p> </p>
</section> </section>
<section> <section>
<h3>Outline</h3> <h2>Levels of Fomu</h2>
<ol> <p>
<li>Fomu Firmware Layout</li> Fomu aims to be accessable on three levels:
<li> <ol>
<ol> <li>Python / Interpreted</li>
<li>Bootloader</li> <li>RISC-V</li>
<li>Recovery</li> <li>Verilog / FPGA</li>
<li>Magic constants</li> </ol>
<li>Interpreters</li> </p>
<li>Updates</li>
</ol>
</li>
<li>Loading firmware onto Fomu</li>
<li>Blinkenlights</li>
</ol>
</section> </section>
<section> <section>
<h2>Workshop Outline</h2> <h2>Workshop Outline</h2>
<ol> <ol>
<li>What do I need to get started?</li> <li>What do I need to get started?</li>
<li>What is Fomu, and what is an FPGA?</li> <li>What is an FPGA, and what is Fomu?</li>
<li>What can I do with Fomu?</li>
<li>What makes Fomu special?</li> <li>What makes Fomu special?</li>
<li>What can I do with Fomu?</li>
</ol> </ol>
</section> </section>
@ -133,9 +127,13 @@
<section> <section>
<h2>What do I need to get started?</h2> <h2>What do I need to get started?</h2>
<ol> <ol>
<li>DFU utilities</li>
<li>Serial console</li>
<li>RISC-V toolchain</li>
<li>Synthesis</li> <li>Synthesis</li>
<li>Place-and-Route</li> <li>Place-and-Route</li>
<li>Packer</li> <li>Packer</li>
<li>Python 3</li>
</ol> </ol>
</section> </section>
</section> </section>
@ -143,34 +141,65 @@
<section> <section>
<section> <section>
<h2>What is an FPGA?</h2> <h2>What is an FPGA?</h2>
<p> <img data-src="img/ice40-lut.png" alt="SB_LUT4">
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>
<p> An FPGA is a chip that executes logic.
FPGAs are measured in resources called LUTs or LCs. </p>
</p> <p>
FPGAs are measured in resources called LUTs or LCs.
</p>
-->
</section> </section>
<section>
<h2>What is an FPGA?</h2>
<pre><code class="verilog" data-trim>
module DFF (output reg Q, input C, D, R);
always @(posedge C)
if (~R) begin
Q <= 1'b0;
end else begin
Q <= D;
end
endmodule
</code></pre>
</section>
<section>
<h2>About the ICE40UP5K</h2>
<ol>
<li>5280 4-input LUTs (LC)</li>
<li>16 kilobytes BRAM</li>
<li class="fragment highlight-blue">128 kilobytes "SPRAM"</li>
<li>Current-limited 3-channel LED</li>
<li>2x I2C and 2x SPI</li>
<li>8 16-bit DSP units</li>
<li>Warmboot capability</li>
</ol>
</section>
<section> <section>
<h2>What is Fomu?</h2> <h2>What is Fomu?</h2>
<p> <ul>
<li>ICE40UP5K in your USB port</li>
<li>2MB flash memory</li>
<li>Four edge-plated pads</li>
<li>ESD protection</li>
<li>USB implemented in HDL</li>
</ul>
<!-- <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. 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. 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> </p> -->
</section>
<section>
<h2>Fomu Block Design Diagram</h2>
</section>
<section>
<h2>ICE40 Features</h2>
</section> </section>
<section> <section>
<h2>What is this PCB?</h2> <h2>What is this PCB?</h2>
<p> <img data-src="img/tomu-fpga-evt-1-small.jpg" alt="Fomu EVT1">
<h3>Fomu EVT1</h3>
<!-- <p>
This is Fomu EVT1. This is the original stretch prototype of Fomu. The schematics are the same, but much has changed: 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 * Name changed from Tomu-FPGA to Fomu
@ -189,19 +218,35 @@
* Populate Raspberry Pi header * Populate Raspberry Pi header
* Add PMOD pins to touchpads * Add PMOD pins to touchpads
* Swap PMODa pins for I3C * Swap PMODa pins for I3C
</p> </p> -->
</section> </section>
<section> <section>
<h2>What modifications does it have?</h2> <h2>What modifications does it have?</h2>
<ul> <ul>
<li>Shorting out two zero-ohm resistors</li> <li>Shorting out two zero-ohm resistors (R7, PU)</li>
<li>Programming SPI flash</li> <li>Programming SPI flash</li>
<li>Bending SPI flash pins inward</li> <li>Bending SPI flash pins inward (U4)</li>
<li>Mounting crystal on its side</li> <li>Mounting crystal on its side (U7)</li>
<li>Attaching power to crystal</li> <li>Attaching power to crystal</li>
</ul> </ul>
</section> </section>
<section>
<h2>Fomu Block Design Diagram</h2>
</section>
<section>
<h2>Fomu SPI Flash Layout</h2>
<img data-src="img/fomu-memory-layout.png" alt="Fomu memory layout">
<!-- <ol>
<li>Bootloader</li>
<li>Recovery</li>
<li>Magic constants</li>
<li>Interpreters</li>
<li>Updates</li>
</ol> -->
</section>
</section> </section>
<section> <section>
@ -214,70 +259,17 @@
</section> </section>
<section> <section>
<h2>Updating Fomu</h2> <h2>Updating Fomu</h2>
<code> <pre><code>$ dfu-util -l
sean@PAZUZU  ~\Code\Fomu\foboot\releases\v1.8.1   master ≢  [10:45] Found DFU: [1209:5bf0] name="Fomu DFU Bootloader v1.7.2"
❯ dfu-util -l $ dfu-util -D evt-installable.dfu
dfu-util 0.9 Download [========= ] 36% 38912 bytes
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 -D .\pvt-installable.dfu
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. Download done.
state(7) = dfuMANIFEST, status(0) = No error condition is present $ dfu-util -l
state(8) = dfuMANIFEST-WAIT-RESET, status(0) = No error condition is present Found DFU: [1209:5bf0] name="Fomu DFU Bootloader v1.8.1"
Done! $</code></pre>
sean@PAZUZU  ~\Code\Fomu\foboot\releases\v1.8.1   master ≢  [10:45]
❯ dfu-util -l
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> </section>
</section> </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>
<section> <section>
<h2>Python / Interpreted</h2> <h2>Python / Interpreted</h2>
@ -289,25 +281,46 @@ sean@PAZUZU  ~\Code\Fomu\foboot\releases\v1.8.1   master ≢ 
<section> <section>
<h2>Loading Programs onto Fomu</h2> <h2>Loading Programs onto Fomu</h2>
<code>dfu-util -l</code> <pre><code>
<code>dfu-util -D update.bin</code> $ dfu-util -l
Found DFU: [1209:5bf0] name="Fomu DFU Bootloader v1.8.1"
$ dfu-util -e # Boot current program
$ dfu-util -D new-image.dfu # Load new program</code></pre>
<h3 class="fragment">u<code>5b f0</code>mu</h3>
</section> </section>
<section> <section>
<h2>Loading MicroPython</h2> <h2>Loading MicroPython</h2>
<code>dfu-util -D micropython.dfu</code> <pre><code>$ dfu-util -D micropython-fomu.dfu</code></pre>
</section> </section>
<section> <section>
<h2>Connecting via serial</h2> <h2>Connecting via serial</h2>
<pre class="fragment"><code>screen /dev/cu.usbserial*</code></pre>
<pre class="fragment"><code>screen /dev/ttyACM*</code></pre>
<pre class="fragment"><code>Teraterm</code></pre>
<pre class="fragment"><code>MicroPython v1.10-296-g0a5a77a on 2019-06-18; fomu with vexriscv
>>></code></pre>
</section> </section>
<section> <section>
<h2>Interacting with Fomu</h2> <h2>Interacting with Fomu</h2>
<pre><code class="python" data-trim>
>>> import fomu
>>> rgb = fomu.rgb()
>>> rgb.mode("error")
>>>
</code></pre>
</section> </section>
<section> <section>
<h2>RGB LEDD reference</h2> <h2>RGB LEDD reference</h2>
<img data-src="img/ice40-ledd.png" alt="ICE40 LEDD registers">
<pre class="fragment"><code class="python" data-trim>>>> rgb.write_raw(0b0001, 255)
>>> rgb.write_raw(0b1010, 14)
>>> rgb.write_raw(0b1011, 1)
>>>
</code></pre>
</section> </section>
<section> <section>