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Ryan Malloy 86a5db5b08 Optimize pin mapping for direct bitwise GPIO ops 
Rewire GPIO↔HMC472A so GPIO(n) = step bit (n-1):
  GPIO1→V6(0.5dB), GPIO2→V5(1dB), ... GPIO6→V1(16dB)

This enables single-instruction GPIO updates:
  GPIO.out_w1tc = (step & 0x3F) << 1
  GPIO.out_w1ts = (~step) & 0x7E

Replaces 28-line loop with 4-line bitwise code.
2026-02-03 00:28:33 -07:00

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<!-- Title -->
<text x="400" y="28" text-anchor="middle" class="title">HMC472A Attenuator Controller Wiring</text>
<text x="400" y="46" text-anchor="middle" class="subtitle">Optimized Mapping: GPIO(n) = Step Bit (n-1) — Enables Direct Bitwise Ops</text>
<!-- ESP32-S2 Mini Board -->
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<text x="170" y="116" text-anchor="middle" class="pin-label-white">(WEMOS/LOLIN)</text>
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<rect x="0" y="60" width="25" height="10" class="pin"/><text x="30" y="69" class="pin-label-white">GPIO4</text>
<rect x="0" y="75" width="25" height="10" class="pin"/><text x="30" y="84" class="pin-label-white">GPIO5</text>
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<rect x="0" y="0" width="25" height="10" class="pin"/><text x="-5" y="9" text-anchor="end" class="pin-label-white">5V</text>
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<!-- HMC472A Module Board -->
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<text x="620" y="102" text-anchor="middle" class="board-label">HMC472A Module</text>
<text x="620" y="116" text-anchor="middle" class="pin-label-white">6-bit RF Attenuator</text>
<!-- HMC472A chip representation -->
<rect x="555" y="130" width="60" height="40" rx="2" class="chip"/>
<text x="585" y="155" text-anchor="middle" style="font-size:8px;fill:#666;">HMC472A</text>
<!-- SMA Connectors -->
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<text x="540" y="228" text-anchor="middle" class="pin-label-white">RF IN</text>
<ellipse cx="700" cy="200" rx="15" ry="20" class="sma"/>
<text x="700" y="228" text-anchor="middle" class="pin-label-white">RF OUT</text>
<!-- HMC472A Control Header (8-pin) - optimized order -->
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<rect x="0" y="0" width="25" height="10" class="pin"/><text x="30" y="9" class="pin-label-white">+5V</text>
<rect x="0" y="15" width="25" height="10" class="pin"/><text x="30" y="24" class="pin-label-white">V6 (0.5dB) bit0</text>
<rect x="0" y="30" width="25" height="10" class="pin"/><text x="30" y="39" class="pin-label-white">V5 (1dB) bit1</text>
<rect x="0" y="45" width="25" height="10" class="pin"/><text x="30" y="54" class="pin-label-white">V4 (2dB) bit2</text>
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<!-- Wiring: GND - Black -->
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<circle cx="110" cy="305" r="4" fill="#333"/>
<circle cx="595" cy="360" r="4" fill="#333"/>
<!-- Straight-through data wiring (optimized - no crossovers!) -->
<!-- GPIO1 → V6 -->
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<circle cx="595" cy="270" r="3" fill="#2196F3"/>
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<circle cx="595" cy="285" r="3" fill="#2196F3"/>
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<circle cx="110" cy="245" r="3" fill="#2196F3"/>
<circle cx="595" cy="300" r="3" fill="#2196F3"/>
<!-- GPIO4 → V3 -->
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<circle cx="110" cy="260" r="3" fill="#2196F3"/>
<circle cx="595" cy="315" r="3" fill="#2196F3"/>
<!-- GPIO5 → V2 -->
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<circle cx="110" cy="275" r="3" fill="#2196F3"/>
<circle cx="595" cy="330" r="3" fill="#2196F3"/>
<!-- GPIO6 → V1 -->
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<circle cx="595" cy="345" r="3" fill="#2196F3"/>
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<text x="400" y="428" text-anchor="middle" style="font-weight:bold;" class="note">Optimized Bitwise Mapping</text>
<line x1="285" y1="445" x2="305" y2="445" stroke="#2196F3" stroke-width="3"/>
<text x="310" y="449" class="note">Data: GPIO(n) → V(7-n)</text>
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<line x1="285" y1="485" x2="305" y2="485" stroke="#333" stroke-width="3"/>
<text x="310" y="489" class="note">Ground</text>
<text x="400" y="503" text-anchor="middle" class="code">GPIO.out_w1tc = (step &amp; 0x3F) &lt;&lt; 1</text>
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