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Refactor Rust drivers for strict idiomatic documentation and 8-line enforcement
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Kevin Thomas
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|
||||
<text class="grn" x="310" y="395">true</text>
|
||||
<text class="dim" x="400" y="395">Not equal</text>
|
||||
|
||||
<!-- Logical Panel -->
|
||||
<rect class="pnl" x="615" y="110" width="555" height="340" rx="8"/>
|
||||
<text class="sub" x="635" y="145">Logical Operators</text>
|
||||
<text class="dim" x="635" y="175">Combine conditions into one result</text>
|
||||
<rect x="635" y="190" width="515" height="105" rx="6" fill="#0a0a0f" stroke="#1a1a2e"/>
|
||||
<text class="amb" x="655" y="220">&&</text>
|
||||
<text class="dim" x="720" y="220">AND -- both must be true</text>
|
||||
<text class="amb" x="655" y="255">||</text>
|
||||
<text class="dim" x="720" y="255">OR -- at least one true</text>
|
||||
<text class="amb" x="655" y="290">!</text>
|
||||
<text class="dim" x="720" y="290">NOT -- inverts result</text>
|
||||
|
||||
<!-- Truth table for AND -->
|
||||
<text class="dim" x="635" y="320">AND Truth Table</text>
|
||||
<rect x="635" y="330" width="515" height="165" rx="6" fill="#0a0a0f" stroke="#1a1a2e"/>
|
||||
<text class="dim" x="655" y="355">A</text>
|
||||
<text class="dim" x="755" y="355">B</text>
|
||||
<text class="dim" x="855" y="355">A && B</text>
|
||||
<text class="red" x="655" y="385">false</text>
|
||||
<text class="red" x="755" y="385">false</text>
|
||||
<text class="red" x="855" y="385">false</text>
|
||||
<text class="red" x="655" y="415">false</text>
|
||||
<text class="grn" x="755" y="415">true</text>
|
||||
<text class="red" x="855" y="415">false</text>
|
||||
<text class="grn" x="655" y="445">true</text>
|
||||
<text class="red" x="755" y="445">false</text>
|
||||
<text class="red" x="855" y="445">false</text>
|
||||
<text class="grn" x="655" y="475">true</text>
|
||||
<text class="grn" x="755" y="475">true</text>
|
||||
<text class="grn" x="855" y="475">true</text>
|
||||
|
||||
<!-- Bottom: Code Example -->
|
||||
<rect class="pnl" x="30" y="465" width="1140" height="155" rx="8"/>
|
||||
<text class="sub" x="50" y="500">In Our Code (x=6, y=10)</text>
|
||||
<rect x="50" y="515" width="1100" height="85" rx="6" fill="#0a0a0f" stroke="#1a1a2e"/>
|
||||
<text class="cyn" x="70" y="545">bool relational = (x > y);</text>
|
||||
<text class="dim" x="560" y="545">(6 > 10) = false = 0</text>
|
||||
<text class="cyn" x="70" y="580">bool logical = (x>y) && (y>x);</text>
|
||||
<text class="dim" x="560" y="580">false && true = false = 0</text>
|
||||
|
||||
<!-- Key -->
|
||||
<rect class="pnl" x="30" y="635" width="1140" height="100" rx="8"/>
|
||||
<text class="red" x="50" y="670">In the binary:</text>
|
||||
<text class="txt" x="290" y="670">Both compile to immediate #0</text>
|
||||
<text class="dim" x="50" y="700">Compiler pre-computes: constants are known at compile time</text>
|
||||
<text class="dim" x="50" y="720">Result 0 = false, Result 1 = true</text>
|
||||
</svg>
|
||||
|
After Width: | Height: | Size: 4.8 KiB |
@@ -0,0 +1,89 @@
|
||||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 800">
|
||||
<style>
|
||||
.bg{fill:#0a0a0f}.pnl{fill:#12121a;stroke:#1a1a2e}.hdr{fill:#12121a}
|
||||
.title{font:bold 42px 'Courier New',monospace;fill:#00ff41}
|
||||
.sub{font:bold 28px 'Courier New',monospace;fill:#00d4ff}
|
||||
.txt{font:24px 'Courier New',monospace;fill:#c0c0c0}
|
||||
.dim{font:20px 'Courier New',monospace;fill:#888}
|
||||
.grn{font:bold 24px 'Courier New',monospace;fill:#00ff41}
|
||||
.red{font:bold 24px 'Courier New',monospace;fill:#ff0040}
|
||||
.cyn{font:bold 24px 'Courier New',monospace;fill:#00d4ff}
|
||||
.amb{font:bold 24px 'Courier New',monospace;fill:#ffaa00}
|
||||
.badge{stroke:#00ff41;rx:14}
|
||||
</style>
|
||||
<rect class="bg" width="1200" height="800"/>
|
||||
<rect class="hdr" x="0" y="0" width="1200" height="100" rx="0"/>
|
||||
<text class="title" x="600" y="52" text-anchor="middle">Bitwise & Assignment</text>
|
||||
<text class="dim" x="600" y="88" text-anchor="middle">Bit Manipulation and Compound Assignment</text>
|
||||
|
||||
<!-- Bitwise Panel -->
|
||||
<rect class="pnl" x="30" y="110" width="555" height="370" rx="8"/>
|
||||
<text class="sub" x="50" y="145">Bitwise Operators</text>
|
||||
<rect x="50" y="160" width="515" height="200" rx="6" fill="#0a0a0f" stroke="#1a1a2e"/>
|
||||
<text class="amb" x="70" y="190"><<</text>
|
||||
<text class="dim" x="140" y="190">6 << 1 = 12</text>
|
||||
<text class="dim" x="360" y="190">Left shift</text>
|
||||
<text class="amb" x="70" y="220">>></text>
|
||||
<text class="dim" x="140" y="220">6 >> 1 = 3</text>
|
||||
<text class="dim" x="360" y="220">Right shift</text>
|
||||
<text class="amb" x="70" y="250">&</text>
|
||||
<text class="dim" x="140" y="250">6 & 3 = 2</text>
|
||||
<text class="dim" x="360" y="250">AND</text>
|
||||
<text class="amb" x="70" y="280">|</text>
|
||||
<text class="dim" x="140" y="280">6 | 3 = 7</text>
|
||||
<text class="dim" x="360" y="280">OR</text>
|
||||
<text class="amb" x="70" y="310">^</text>
|
||||
<text class="dim" x="140" y="310">6 ^ 3 = 5</text>
|
||||
<text class="dim" x="360" y="310">XOR</text>
|
||||
<text class="amb" x="70" y="340">~</text>
|
||||
<text class="dim" x="140" y="340">~6</text>
|
||||
<text class="dim" x="360" y="340">NOT (invert)</text>
|
||||
|
||||
<!-- Left shift diagram -->
|
||||
<text class="dim" x="50" y="390">Left shift = multiply by 2</text>
|
||||
<rect x="50" y="400" width="515" height="60" rx="4" fill="#0a0a0f" stroke="#00ff41" stroke-width="1"/>
|
||||
<text class="grn" x="70" y="425">0 0 0 0 0 1 1 0</text>
|
||||
<text class="dim" x="370" y="425">= 6</text>
|
||||
<text class="grn" x="70" y="448">0 0 0 0 1 1 0 0</text>
|
||||
<text class="dim" x="370" y="448">= 12</text>
|
||||
|
||||
<!-- Assignment Panel -->
|
||||
<rect class="pnl" x="615" y="110" width="555" height="370" rx="8"/>
|
||||
<text class="sub" x="635" y="145">Assignment Operators</text>
|
||||
<text class="dim" x="635" y="175">Shorthand for math + assign</text>
|
||||
<rect x="635" y="190" width="515" height="200" rx="6" fill="#0a0a0f" stroke="#1a1a2e"/>
|
||||
<text class="amb" x="655" y="220">+=</text>
|
||||
<text class="dim" x="720" y="220">x += 5</text>
|
||||
<text class="dim" x="905" y="220">x = x + 5</text>
|
||||
<text class="amb" x="655" y="255">-=</text>
|
||||
<text class="dim" x="720" y="255">x -= 2</text>
|
||||
<text class="dim" x="905" y="255">x = x - 2</text>
|
||||
<text class="amb" x="655" y="290">*=</text>
|
||||
<text class="dim" x="720" y="290">x *= 3</text>
|
||||
<text class="dim" x="905" y="290">x = x * 3</text>
|
||||
<text class="amb" x="655" y="325">/=</text>
|
||||
<text class="dim" x="720" y="325">x /= 2</text>
|
||||
<text class="dim" x="905" y="325">x = x / 2</text>
|
||||
<text class="amb" x="655" y="360">%=</text>
|
||||
<text class="dim" x="720" y="360">x %= 4</text>
|
||||
<text class="dim" x="905" y="360">x = x % 4</text>
|
||||
|
||||
<!-- Code example -->
|
||||
<text class="dim" x="635" y="415">In our code (x=6 after x++):</text>
|
||||
<rect x="635" y="425" width="515" height="45" rx="4" fill="#0a0a0f" stroke="#ffaa00" stroke-width="1"/>
|
||||
<text class="amb" x="655" y="453">x += 5 --> 6 + 5 = 11</text>
|
||||
|
||||
<!-- Bottom -->
|
||||
<rect class="pnl" x="30" y="495" width="1140" height="120" rx="8"/>
|
||||
<text class="sub" x="50" y="530">In Our Code (x=6, y=10)</text>
|
||||
<rect x="50" y="545" width="1100" height="50" rx="6" fill="#0a0a0f" stroke="#1a1a2e"/>
|
||||
<text class="cyn" x="70" y="575">int bitwise = (x<<1);</text>
|
||||
<text class="dim" x="500" y="575">6 << 1 = 12 (0b0110 --> 0b1100)</text>
|
||||
|
||||
<!-- Binary output preview -->
|
||||
<rect class="pnl" x="30" y="630" width="1140" height="110" rx="8"/>
|
||||
<text class="sub" x="50" y="665">Expected Output</text>
|
||||
<text class="txt" x="50" y="700">bitwise_operator: 12</text>
|
||||
<text class="txt" x="470" y="700">assignment_operator: 11</text>
|
||||
<text class="dim" x="50" y="725">Both pre-computed by compiler as immediates</text>
|
||||
</svg>
|
||||
|
After Width: | Height: | Size: 4.4 KiB |
@@ -0,0 +1,72 @@
|
||||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 800">
|
||||
<style>
|
||||
.bg{fill:#0a0a0f}.pnl{fill:#12121a;stroke:#1a1a2e}.hdr{fill:#12121a}
|
||||
.title{font:bold 42px 'Courier New',monospace;fill:#00ff41}
|
||||
.sub{font:bold 28px 'Courier New',monospace;fill:#00d4ff}
|
||||
.txt{font:24px 'Courier New',monospace;fill:#c0c0c0}
|
||||
.dim{font:20px 'Courier New',monospace;fill:#888}
|
||||
.grn{font:bold 24px 'Courier New',monospace;fill:#00ff41}
|
||||
.red{font:bold 24px 'Courier New',monospace;fill:#ff0040}
|
||||
.cyn{font:bold 24px 'Courier New',monospace;fill:#00d4ff}
|
||||
.amb{font:bold 24px 'Courier New',monospace;fill:#ffaa00}
|
||||
.badge{stroke:#00ff41;rx:14}
|
||||
</style>
|
||||
<rect class="bg" width="1200" height="800"/>
|
||||
<rect class="hdr" x="0" y="0" width="1200" height="100" rx="0"/>
|
||||
<text class="title" x="600" y="52" text-anchor="middle">DHT11 Sensor</text>
|
||||
<text class="dim" x="600" y="88" text-anchor="middle">Single-Wire Temperature and Humidity</text>
|
||||
|
||||
<!-- Left: Pinout and Specs -->
|
||||
<rect class="pnl" x="30" y="110" width="555" height="260" rx="8"/>
|
||||
<text class="sub" x="50" y="145">DHT11 Pinout</text>
|
||||
|
||||
<rect x="180" y="165" width="120" height="80" rx="4" fill="#0a0a0f" stroke="#00ff41" stroke-width="2"/>
|
||||
<text class="grn" x="205" y="212">DHT11</text>
|
||||
<text class="dim" x="180" y="265">1:VCC 2:DATA 3:NC 4:GND</text>
|
||||
|
||||
<text class="dim" x="50" y="300">Humidity: 20-90% RH (+/-5%)</text>
|
||||
<text class="dim" x="50" y="325">Temp: 0-50C (+/-2C)</text>
|
||||
<text class="dim" x="50" y="350">Protocol: custom one-wire</text>
|
||||
|
||||
<!-- Right: Wiring -->
|
||||
<rect class="pnl" x="615" y="110" width="555" height="260" rx="8"/>
|
||||
<text class="sub" x="635" y="145">Wiring to Pico 2</text>
|
||||
|
||||
<rect x="635" y="165" width="100" height="45" rx="4" fill="#0a0a0f" stroke="#00d4ff" stroke-width="1"/>
|
||||
<text class="cyn" x="655" y="194">Pico</text>
|
||||
|
||||
<rect x="1040" y="165" width="100" height="45" rx="4" fill="#0a0a0f" stroke="#00ff41" stroke-width="1"/>
|
||||
<text class="grn" x="1055" y="194">DHT11</text>
|
||||
|
||||
<line x1="735" y1="178" x2="1040" y2="178" stroke="#ffaa00" stroke-width="2"/>
|
||||
<line x1="735" y1="198" x2="1040" y2="198" stroke="#888" stroke-width="2"/>
|
||||
|
||||
<text class="dim" x="635" y="230">GPIO 4 = DATA</text>
|
||||
<text class="dim" x="635" y="255">3.3V = VCC</text>
|
||||
<text class="dim" x="635" y="280">GND = GND</text>
|
||||
|
||||
<!-- Communication Protocol -->
|
||||
<rect class="pnl" x="635" y="295" width="555" height="75" rx="6"/>
|
||||
<text class="dim" x="655" y="320">1. Host pulls LOW 18ms</text>
|
||||
<text class="dim" x="655" y="345">2. DHT11 responds, sends 40 bits</text>
|
||||
|
||||
<!-- Source Code -->
|
||||
<rect class="pnl" x="30" y="385" width="1140" height="380" rx="8"/>
|
||||
<text class="sub" x="50" y="420">Source Code: 0x001a_operators.c</text>
|
||||
<rect x="50" y="435" width="1100" height="310" rx="6" fill="#0a0a0f" stroke="#1a1a2e"/>
|
||||
<text class="cyn" x="70" y="465">int x = 5, y = 10;</text>
|
||||
<text class="txt" x="70" y="495">int arithmetic = (x * y);</text>
|
||||
<text class="dim" x="530" y="495">// 50</text>
|
||||
<text class="txt" x="70" y="525">int increment = x++;</text>
|
||||
<text class="dim" x="530" y="525">// 5 (post)</text>
|
||||
<text class="txt" x="70" y="555">bool relational = (x > y);</text>
|
||||
<text class="dim" x="530" y="555">// false</text>
|
||||
<text class="txt" x="70" y="585">bool logical = (x>y)&&(y>x);</text>
|
||||
<text class="dim" x="530" y="585">// false</text>
|
||||
<text class="txt" x="70" y="615">int bitwise = (x<<1);</text>
|
||||
<text class="dim" x="530" y="615">// 12</text>
|
||||
<text class="txt" x="70" y="645">int assignment = (x += 5);</text>
|
||||
<text class="dim" x="530" y="645">// 11</text>
|
||||
<text class="cyn" x="70" y="680">float hum, temp;</text>
|
||||
<text class="txt" x="70" y="710">dht11_read(&hum, &temp);</text>
|
||||
</svg>
|
||||
|
After Width: | Height: | Size: 3.6 KiB |
@@ -0,0 +1,75 @@
|
||||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 800">
|
||||
<style>
|
||||
.bg{fill:#0a0a0f}.pnl{fill:#12121a;stroke:#1a1a2e}.hdr{fill:#12121a}
|
||||
.title{font:bold 42px 'Courier New',monospace;fill:#00ff41}
|
||||
.sub{font:bold 28px 'Courier New',monospace;fill:#00d4ff}
|
||||
.txt{font:24px 'Courier New',monospace;fill:#c0c0c0}
|
||||
.dim{font:20px 'Courier New',monospace;fill:#888}
|
||||
.grn{font:bold 24px 'Courier New',monospace;fill:#00ff41}
|
||||
.red{font:bold 24px 'Courier New',monospace;fill:#ff0040}
|
||||
.cyn{font:bold 24px 'Courier New',monospace;fill:#00d4ff}
|
||||
.amb{font:bold 24px 'Courier New',monospace;fill:#ffaa00}
|
||||
.badge{stroke:#00ff41;rx:14}
|
||||
</style>
|
||||
<rect class="bg" width="1200" height="800"/>
|
||||
<rect class="hdr" x="0" y="0" width="1200" height="100" rx="0"/>
|
||||
<text class="title" x="600" y="52" text-anchor="middle">Variable Flow</text>
|
||||
<text class="dim" x="600" y="88" text-anchor="middle">Tracing x Through Every Operator</text>
|
||||
|
||||
<!-- Variable trace table -->
|
||||
<rect class="pnl" x="30" y="110" width="1140" height="650" rx="8"/>
|
||||
<text class="sub" x="50" y="150">Tracing x Step-by-Step</text>
|
||||
|
||||
<!-- Header row -->
|
||||
<text class="amb" x="50" y="195">Line</text>
|
||||
<text class="amb" x="520" y="195">x</text>
|
||||
<text class="amb" x="640" y="195">Result</text>
|
||||
<line x1="50" y1="205" x2="1140" y2="205" stroke="#1a1a2e" stroke-width="1"/>
|
||||
|
||||
<!-- Row 1: init -->
|
||||
<text class="cyn" x="50" y="240">int x = 5, y = 10;</text>
|
||||
<text class="grn" x="520" y="240">5</text>
|
||||
<text class="dim" x="640" y="240">x initialized to 5</text>
|
||||
|
||||
<!-- Row 2: arithmetic -->
|
||||
<text class="txt" x="50" y="280">int arithmetic = (x * y);</text>
|
||||
<text class="grn" x="520" y="280">5</text>
|
||||
<text class="txt" x="640" y="280">arithmetic = 50</text>
|
||||
|
||||
<!-- Row 3: post-increment -->
|
||||
<text class="txt" x="50" y="320">int increment = x++;</text>
|
||||
<text class="red" x="520" y="320">5-->6</text>
|
||||
<text class="txt" x="640" y="320">increment = 5</text>
|
||||
<text class="dim" x="640" y="345">use THEN increment</text>
|
||||
|
||||
<!-- Row 4: relational -->
|
||||
<text class="txt" x="50" y="385">bool relational = (x > y);</text>
|
||||
<text class="grn" x="520" y="385">6</text>
|
||||
<text class="txt" x="640" y="385">relational = false</text>
|
||||
<text class="dim" x="640" y="410">6 > 10 is false</text>
|
||||
|
||||
<!-- Row 5: logical -->
|
||||
<text class="txt" x="50" y="450">bool logical = (x>y)&&(y>x);</text>
|
||||
<text class="grn" x="520" y="450">6</text>
|
||||
<text class="txt" x="640" y="450">logical = false</text>
|
||||
<text class="dim" x="640" y="475">false AND true = false</text>
|
||||
|
||||
<!-- Row 6: bitwise -->
|
||||
<text class="txt" x="50" y="515">int bitwise = (x<<1);</text>
|
||||
<text class="grn" x="520" y="515">6</text>
|
||||
<text class="txt" x="640" y="515">bitwise = 12</text>
|
||||
<text class="dim" x="640" y="540">0b0110 << 1 = 0b1100</text>
|
||||
|
||||
<!-- Row 7: assignment -->
|
||||
<text class="txt" x="50" y="580">int assignment = (x += 5);</text>
|
||||
<text class="red" x="520" y="580">6-->11</text>
|
||||
<text class="txt" x="640" y="580">assignment = 11</text>
|
||||
<text class="dim" x="640" y="605">6 + 5 = 11</text>
|
||||
|
||||
<!-- DHT11 output -->
|
||||
<line x1="50" y1="635" x2="1140" y2="635" stroke="#1a1a2e" stroke-width="1"/>
|
||||
<text class="sub" x="50" y="670">DHT11 Output</text>
|
||||
<text class="grn" x="50" y="705">Humidity: 51.0%</text>
|
||||
<text class="grn" x="400" y="705">Temperature: 23.8C</text>
|
||||
<text class="dim" x="50" y="735">dht11_read(&hum, &temp) -- passes addresses so function can write values</text>
|
||||
</svg>
|
||||
|
After Width: | Height: | Size: 3.3 KiB |
@@ -0,0 +1,77 @@
|
||||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 800">
|
||||
<style>
|
||||
.bg{fill:#0a0a0f}.pnl{fill:#12121a;stroke:#1a1a2e}.hdr{fill:#12121a}
|
||||
.title{font:bold 42px 'Courier New',monospace;fill:#00ff41}
|
||||
.sub{font:bold 28px 'Courier New',monospace;fill:#00d4ff}
|
||||
.txt{font:24px 'Courier New',monospace;fill:#c0c0c0}
|
||||
.dim{font:20px 'Courier New',monospace;fill:#888}
|
||||
.grn{font:bold 24px 'Courier New',monospace;fill:#00ff41}
|
||||
.red{font:bold 24px 'Courier New',monospace;fill:#ff0040}
|
||||
.cyn{font:bold 24px 'Courier New',monospace;fill:#00d4ff}
|
||||
.amb{font:bold 24px 'Courier New',monospace;fill:#ffaa00}
|
||||
.badge{stroke:#00ff41;rx:14}
|
||||
</style>
|
||||
<rect class="bg" width="1200" height="800"/>
|
||||
<rect class="hdr" x="0" y="0" width="1200" height="100" rx="0"/>
|
||||
<text class="title" x="600" y="52" text-anchor="middle">Vector Table</text>
|
||||
<text class="dim" x="600" y="88" text-anchor="middle">Finding Reset_Handler and main()</text>
|
||||
|
||||
<!-- Vector Table Structure -->
|
||||
<rect class="pnl" x="30" y="110" width="555" height="280" rx="8"/>
|
||||
<text class="sub" x="50" y="150">ARM Vector Table</text>
|
||||
<text class="dim" x="50" y="178">Base address: 0x10000000</text>
|
||||
|
||||
<text class="amb" x="50" y="215">Offset</text>
|
||||
<text class="amb" x="180" y="215">Contents</text>
|
||||
<text class="amb" x="400" y="215">Purpose</text>
|
||||
<line x1="50" y1="225" x2="565" y2="225" stroke="#1a1a2e" stroke-width="1"/>
|
||||
|
||||
<text class="grn" x="50" y="255">0x00</text>
|
||||
<text class="txt" x="180" y="255">Initial SP</text>
|
||||
<text class="dim" x="400" y="255">Stack ptr</text>
|
||||
|
||||
<text class="grn" x="50" y="290">0x04</text>
|
||||
<text class="cyn" x="180" y="290">Reset_Handler</text>
|
||||
<text class="dim" x="400" y="290">Entry point</text>
|
||||
|
||||
<text class="grn" x="50" y="325">0x08</text>
|
||||
<text class="txt" x="180" y="325">NMI_Handler</text>
|
||||
<text class="dim" x="400" y="325">NMI</text>
|
||||
|
||||
<text class="grn" x="50" y="360">0x0C</text>
|
||||
<text class="txt" x="180" y="360">HardFault</text>
|
||||
<text class="dim" x="400" y="360">Fault</text>
|
||||
|
||||
<!-- Little-Endian + Thumb Bit -->
|
||||
<rect class="pnl" x="615" y="110" width="555" height="280" rx="8"/>
|
||||
<text class="sub" x="635" y="150">Decoding the Address</text>
|
||||
|
||||
<text class="txt" x="635" y="190">At 0x10000004:</text>
|
||||
<text class="grn" x="635" y="225">Bytes: 5d 01 00 10</text>
|
||||
|
||||
<text class="amb" x="635" y="265">Step 1: Reverse (little-endian)</text>
|
||||
<text class="txt" x="635" y="295">10 00 01 5d = 0x1000015d</text>
|
||||
|
||||
<text class="amb" x="635" y="330">Step 2: Remove Thumb bit</text>
|
||||
<text class="txt" x="635" y="360">0x1000015d - 1 = 0x1000015c</text>
|
||||
|
||||
<!-- Reset_Handler Flow -->
|
||||
<rect class="pnl" x="30" y="410" width="1140" height="350" rx="8"/>
|
||||
<text class="sub" x="50" y="450">Reset_Handler --> main()</text>
|
||||
|
||||
<text class="dim" x="50" y="485">Reset_Handler at 0x1000015c calls 3 functions:</text>
|
||||
|
||||
<rect x="50" y="505" width="1100" height="230" rx="6" fill="#0a0a0f" stroke="#1a1a2e"/>
|
||||
<text class="txt" x="70" y="540">Call 1: some_init()</text>
|
||||
<text class="dim" x="450" y="540">Hardware initialization</text>
|
||||
|
||||
<text class="cyn" x="70" y="580">Call 2: main()</text>
|
||||
<text class="amb" x="450" y="580">THIS IS WHAT WE WANT</text>
|
||||
<text class="dim" x="450" y="605">Address: 0x10000234</text>
|
||||
|
||||
<text class="txt" x="70" y="645">Call 3: exit()</text>
|
||||
<text class="dim" x="450" y="645">Never returns</text>
|
||||
|
||||
<text class="dim" x="70" y="685">The MIDDLE function call is always main()</text>
|
||||
<text class="dim" x="70" y="710">Navigate to 0x10000234 in Ghidra to find it</text>
|
||||
</svg>
|
||||
|
After Width: | Height: | Size: 3.4 KiB |
@@ -0,0 +1,81 @@
|
||||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 800">
|
||||
<style>
|
||||
.bg{fill:#0a0a0f}.pnl{fill:#12121a;stroke:#1a1a2e}.hdr{fill:#12121a}
|
||||
.title{font:bold 42px 'Courier New',monospace;fill:#00ff41}
|
||||
.sub{font:bold 28px 'Courier New',monospace;fill:#00d4ff}
|
||||
.txt{font:24px 'Courier New',monospace;fill:#c0c0c0}
|
||||
.dim{font:20px 'Courier New',monospace;fill:#888}
|
||||
.grn{font:bold 24px 'Courier New',monospace;fill:#00ff41}
|
||||
.red{font:bold 24px 'Courier New',monospace;fill:#ff0040}
|
||||
.cyn{font:bold 24px 'Courier New',monospace;fill:#00d4ff}
|
||||
.amb{font:bold 24px 'Courier New',monospace;fill:#ffaa00}
|
||||
.badge{stroke:#00ff41;rx:14}
|
||||
</style>
|
||||
<rect class="bg" width="1200" height="800"/>
|
||||
<rect class="hdr" x="0" y="0" width="1200" height="100" rx="0"/>
|
||||
<text class="title" x="600" y="52" text-anchor="middle">IEEE-754 Floats</text>
|
||||
<text class="dim" x="600" y="88" text-anchor="middle">How Computers Store Decimal Numbers</text>
|
||||
|
||||
<!-- Float Layout Diagram -->
|
||||
<rect class="pnl" x="30" y="110" width="1140" height="190" rx="8"/>
|
||||
<text class="sub" x="50" y="150">32-bit Float Structure</text>
|
||||
|
||||
<!-- Bit field boxes -->
|
||||
<rect x="50" y="170" width="80" height="50" rx="4" fill="#ff0040" fill-opacity="0.2" stroke="#ff0040"/>
|
||||
<text class="red" x="70" y="202">S</text>
|
||||
<text class="dim" x="55" y="240">1 bit</text>
|
||||
|
||||
<rect x="150" y="170" width="320" height="50" rx="4" fill="#ffaa00" fill-opacity="0.2" stroke="#ffaa00"/>
|
||||
<text class="amb" x="260" y="202">Exponent</text>
|
||||
<text class="dim" x="270" y="240">8 bits</text>
|
||||
|
||||
<rect x="490" y="170" width="660" height="50" rx="4" fill="#00d4ff" fill-opacity="0.2" stroke="#00d4ff"/>
|
||||
<text class="cyn" x="740" y="202">Mantissa (Fraction)</text>
|
||||
<text class="dim" x="760" y="240">23 bits</text>
|
||||
|
||||
<text class="dim" x="50" y="280">Value = (-1)^S x (1 + Mantissa) x 2^(Exponent - 127)</text>
|
||||
|
||||
<!-- Example: Decoding 0.1f -->
|
||||
<rect class="pnl" x="30" y="320" width="1140" height="220" rx="8"/>
|
||||
<text class="sub" x="50" y="360">Example: Decoding 0.1f</text>
|
||||
|
||||
<text class="txt" x="50" y="400">Little-endian bytes:</text>
|
||||
<text class="grn" x="380" y="400">cd cc cc 3d</text>
|
||||
|
||||
<text class="txt" x="50" y="435">Reversed (big-endian):</text>
|
||||
<text class="grn" x="380" y="435">0x3dcccccd</text>
|
||||
|
||||
<text class="amb" x="50" y="475">Sign: 0</text>
|
||||
<text class="amb" x="250" y="475">Exp: 01111011 = 123</text>
|
||||
<text class="amb" x="580" y="475">Mantissa: 1001100...</text>
|
||||
|
||||
<text class="txt" x="50" y="510">Exp - 127 = -4, so value = 1.6 x 2^(-4)</text>
|
||||
<text class="grn" x="680" y="510">= 0.1</text>
|
||||
|
||||
<!-- Float Reference Table -->
|
||||
<rect class="pnl" x="30" y="560" width="1140" height="200" rx="8"/>
|
||||
<text class="sub" x="50" y="600">IEEE-754 Quick Reference</text>
|
||||
|
||||
<text class="amb" x="50" y="635">Value</text>
|
||||
<text class="amb" x="200" y="635">Hex</text>
|
||||
<text class="amb" x="430" y="635">Bytes (LE)</text>
|
||||
<line x1="50" y1="645" x2="1140" y2="645" stroke="#1a1a2e" stroke-width="1"/>
|
||||
|
||||
<text class="txt" x="50" y="675">0.1</text>
|
||||
<text class="grn" x="200" y="675">0x3dcccccd</text>
|
||||
<text class="dim" x="430" y="675">cd cc cc 3d</text>
|
||||
<text class="txt" x="700" y="675">1.0</text>
|
||||
<text class="grn" x="820" y="675">0x3f800000</text>
|
||||
<text class="dim" x="1020" y="675">00 00 80 3f</text>
|
||||
|
||||
<text class="txt" x="50" y="710">5.0</text>
|
||||
<text class="grn" x="200" y="710">0x40a00000</text>
|
||||
<text class="dim" x="430" y="710">00 00 a0 40</text>
|
||||
<text class="txt" x="700" y="710">10.0</text>
|
||||
<text class="grn" x="820" y="710">0x41200000</text>
|
||||
<text class="dim" x="1020" y="710">00 00 20 41</text>
|
||||
|
||||
<text class="txt" x="50" y="740">-1.0</text>
|
||||
<text class="grn" x="200" y="740">0xbf800000</text>
|
||||
<text class="dim" x="430" y="740">00 00 80 bf</text>
|
||||
</svg>
|
||||
|
After Width: | Height: | Size: 3.6 KiB |
@@ -0,0 +1,64 @@
|
||||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 800">
|
||||
<style>
|
||||
.bg{fill:#0a0a0f}.pnl{fill:#12121a;stroke:#1a1a2e}.hdr{fill:#12121a}
|
||||
.title{font:bold 42px 'Courier New',monospace;fill:#00ff41}
|
||||
.sub{font:bold 28px 'Courier New',monospace;fill:#00d4ff}
|
||||
.txt{font:24px 'Courier New',monospace;fill:#c0c0c0}
|
||||
.dim{font:20px 'Courier New',monospace;fill:#888}
|
||||
.grn{font:bold 24px 'Courier New',monospace;fill:#00ff41}
|
||||
.red{font:bold 24px 'Courier New',monospace;fill:#ff0040}
|
||||
.cyn{font:bold 24px 'Courier New',monospace;fill:#00d4ff}
|
||||
.amb{font:bold 24px 'Courier New',monospace;fill:#ffaa00}
|
||||
.badge{stroke:#00ff41;rx:14}
|
||||
</style>
|
||||
<rect class="bg" width="1200" height="800"/>
|
||||
<rect class="hdr" x="0" y="0" width="1200" height="100" rx="0"/>
|
||||
<text class="title" x="600" y="52" text-anchor="middle">Hacking the Float</text>
|
||||
<text class="dim" x="600" y="88" text-anchor="middle">Changing the DHT11 Scaling Constant</text>
|
||||
|
||||
<!-- DHT11 Scaling Formula -->
|
||||
<rect class="pnl" x="30" y="110" width="1140" height="150" rx="8"/>
|
||||
<text class="sub" x="50" y="150">DHT11 Scaling Calculation</text>
|
||||
<text class="txt" x="50" y="190">result = integer + (decimal x 0.1)</text>
|
||||
<text class="dim" x="50" y="218">Example: temp = 23 + (8 x 0.1) = 23.8C</text>
|
||||
<text class="amb" x="700" y="190">0.1f is our target!</text>
|
||||
|
||||
<!-- Key Offsets -->
|
||||
<rect class="pnl" x="30" y="280" width="1140" height="200" rx="8"/>
|
||||
<text class="sub" x="50" y="320">Key Offsets in Binary</text>
|
||||
|
||||
<text class="amb" x="50" y="360">Offset</text>
|
||||
<text class="amb" x="200" y="360">Bytes</text>
|
||||
<text class="amb" x="480" y="360">Meaning</text>
|
||||
<line x1="50" y1="370" x2="1140" y2="370" stroke="#1a1a2e" stroke-width="1"/>
|
||||
|
||||
<text class="grn" x="50" y="400">0x410</text>
|
||||
<text class="txt" x="200" y="400">a6 ee 25 7a</text>
|
||||
<text class="dim" x="480" y="400">vfma.f32 s14,s12,s11 (humidity)</text>
|
||||
|
||||
<text class="grn" x="50" y="435">0x414</text>
|
||||
<text class="txt" x="200" y="435">e6 ee a5 7a</text>
|
||||
<text class="dim" x="480" y="435">vfma.f32 s15,s13,s11 (temp)</text>
|
||||
|
||||
<text class="red" x="50" y="470">0x42C</text>
|
||||
<text class="cyn" x="200" y="470">cd cc cc 3d</text>
|
||||
<text class="amb" x="480" y="470">0.1f -- the scaling constant</text>
|
||||
|
||||
<!-- The Hack -->
|
||||
<rect class="pnl" x="30" y="500" width="1140" height="260" rx="8"/>
|
||||
<text class="sub" x="50" y="540">The Hack: 0.1f --> 5.0f</text>
|
||||
|
||||
<text class="txt" x="50" y="580">At offset 0x42C, change:</text>
|
||||
|
||||
<rect x="50" y="600" width="500" height="50" rx="6" fill="#0a0a0f" stroke="#ff0040"/>
|
||||
<text class="red" x="70" y="632">Original: cd cc cc 3d</text>
|
||||
<text class="dim" x="380" y="632">(0.1f)</text>
|
||||
|
||||
<rect x="600" y="600" width="500" height="50" rx="6" fill="#0a0a0f" stroke="#00ff41"/>
|
||||
<text class="grn" x="620" y="632">Patched: 00 00 a0 40</text>
|
||||
<text class="dim" x="930" y="632">(5.0f)</text>
|
||||
|
||||
<text class="txt" x="50" y="685">New result: 23 + (8 x 5.0) = 63.0C</text>
|
||||
<text class="dim" x="50" y="715">Decimal part is now multiplied by 5.0 instead of 0.1</text>
|
||||
<text class="dim" x="50" y="740">Export .bin from Ghidra, convert to UF2, flash to Pico</text>
|
||||
</svg>
|
||||
|
After Width: | Height: | Size: 3.0 KiB |
@@ -0,0 +1,97 @@
|
||||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 800">
|
||||
<style>
|
||||
.bg{fill:#0a0a0f}.pnl{fill:#12121a;stroke:#1a1a2e}.hdr{fill:#12121a}
|
||||
.title{font:bold 42px 'Courier New',monospace;fill:#00ff41}
|
||||
.sub{font:bold 28px 'Courier New',monospace;fill:#00d4ff}
|
||||
.txt{font:24px 'Courier New',monospace;fill:#c0c0c0}
|
||||
.dim{font:20px 'Courier New',monospace;fill:#888}
|
||||
.grn{font:bold 24px 'Courier New',monospace;fill:#00ff41}
|
||||
.red{font:bold 24px 'Courier New',monospace;fill:#ff0040}
|
||||
.cyn{font:bold 24px 'Courier New',monospace;fill:#00d4ff}
|
||||
.amb{font:bold 24px 'Courier New',monospace;fill:#ffaa00}
|
||||
.badge{stroke:#00ff41;rx:14}
|
||||
</style>
|
||||
<rect class="bg" width="1200" height="800"/>
|
||||
<rect class="hdr" x="0" y="0" width="1200" height="100" rx="0"/>
|
||||
<text class="title" x="600" y="52" text-anchor="middle">Operators & DHT11 Hacking</text>
|
||||
<text class="dim" x="600" y="88" text-anchor="middle">Operators, DHT11, IEEE-754, and Hacking</text>
|
||||
|
||||
<!-- Left: 6 Operator Types -->
|
||||
<rect class="pnl" x="30" y="110" width="555" height="280" rx="8"/>
|
||||
<text class="sub" x="50" y="150">6 Operator Types</text>
|
||||
|
||||
<text class="grn" x="50" y="185">Arithmetic</text>
|
||||
<text class="dim" x="260" y="185">x * y = 50</text>
|
||||
|
||||
<text class="grn" x="50" y="215">Increment</text>
|
||||
<text class="dim" x="260" y="215">x++ returns 5, x becomes 6</text>
|
||||
|
||||
<text class="grn" x="50" y="245">Relational</text>
|
||||
<text class="dim" x="260" y="245">(6 > 10) = false</text>
|
||||
|
||||
<text class="grn" x="50" y="275">Logical</text>
|
||||
<text class="dim" x="260" y="275">false && true = false</text>
|
||||
|
||||
<text class="grn" x="50" y="305">Bitwise</text>
|
||||
<text class="dim" x="260" y="305">6 << 1 = 12</text>
|
||||
|
||||
<text class="grn" x="50" y="335">Assignment</text>
|
||||
<text class="dim" x="260" y="335">x += 5 = 11</text>
|
||||
|
||||
<text class="dim" x="50" y="370">Post-increment: use THEN increment</text>
|
||||
|
||||
<!-- Right: Key Addresses -->
|
||||
<rect class="pnl" x="615" y="110" width="555" height="280" rx="8"/>
|
||||
<text class="sub" x="635" y="150">Key Addresses</text>
|
||||
|
||||
<text class="cyn" x="635" y="190">0x10000000</text>
|
||||
<text class="dim" x="870" y="190">Vector table</text>
|
||||
|
||||
<text class="cyn" x="635" y="225">0x10000004</text>
|
||||
<text class="dim" x="870" y="225">Reset_Handler addr</text>
|
||||
|
||||
<text class="cyn" x="635" y="260">0x10000234</text>
|
||||
<text class="dim" x="870" y="260">main()</text>
|
||||
|
||||
<text class="cyn" x="635" y="295">0x10000410</text>
|
||||
<text class="dim" x="870" y="295">Humidity vfma</text>
|
||||
|
||||
<text class="cyn" x="635" y="330">0x10000414</text>
|
||||
<text class="dim" x="870" y="330">Temp vfma</text>
|
||||
|
||||
<text class="red" x="635" y="365">0x1000042C</text>
|
||||
<text class="dim" x="870" y="365">0.1f constant (hack)</text>
|
||||
|
||||
<!-- IEEE-754 -->
|
||||
<rect class="pnl" x="30" y="410" width="555" height="160" rx="8"/>
|
||||
<text class="sub" x="50" y="450">IEEE-754 Format</text>
|
||||
<text class="txt" x="50" y="485">S(1) + Exp(8) + Mantissa(23)</text>
|
||||
<text class="dim" x="50" y="515">(-1)^S x (1+M) x 2^(E-127)</text>
|
||||
<text class="dim" x="50" y="545">0.1f = 0x3dcccccd = cd cc cc 3d</text>
|
||||
|
||||
<!-- Hack Workflow -->
|
||||
<rect class="pnl" x="615" y="410" width="555" height="160" rx="8"/>
|
||||
<text class="sub" x="635" y="450">Hack Workflow</text>
|
||||
<text class="txt" x="635" y="485">1. Analyze in Ghidra</text>
|
||||
<text class="txt" x="635" y="515">2. Find float at 0x42C</text>
|
||||
<text class="txt" x="635" y="545">3. Patch cd cc cc 3d</text>
|
||||
|
||||
<!-- Bottom: Steps -->
|
||||
<rect class="pnl" x="30" y="590" width="1140" height="170" rx="8"/>
|
||||
<text class="sub" x="50" y="630">Binary Hacking Steps</text>
|
||||
|
||||
<text class="amb" x="50" y="665">Analyze</text>
|
||||
<text class="txt" x="200" y="665">--></text>
|
||||
<text class="amb" x="260" y="665">Identify</text>
|
||||
<text class="txt" x="410" y="665">--></text>
|
||||
<text class="amb" x="470" y="665">Offset</text>
|
||||
<text class="txt" x="600" y="665">--></text>
|
||||
<text class="amb" x="660" y="665">Patch</text>
|
||||
<text class="txt" x="790" y="665">--></text>
|
||||
<text class="amb" x="850" y="665">Export</text>
|
||||
<text class="txt" x="990" y="665">--></text>
|
||||
<text class="amb" x="1050" y="665">Test</text>
|
||||
|
||||
<text class="dim" x="50" y="700">Project: 0x001a_operators</text>
|
||||
<text class="dim" x="50" y="730">Source: 0x001a_operators.c with DHT11 sensor on GPIO 4</text>
|
||||
</svg>
|
||||
|
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Reference in New Issue
Block a user