72 lines
2.0 KiB
TypeScript
72 lines
2.0 KiB
TypeScript
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/**
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* Shared 40-pin GPIO header layout used by every Raspberry Pi from the
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* 1B+ onwards (Zero W, 1B+, 2, 3, 4, 5). Same physical positions, same
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* BCM GPIO assignment, same naming convention — so wires drawn against
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* a Pi 3 example transfer to a Pi 4 or Pi 5 board without re-routing.
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*
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* Coordinates are in CSS pixels relative to the board element's top-left,
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* sized to fit the 250×160 footprint shared by every Velxio Pi element.
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* Pin "1" sits top-left; odd pins on the top row, even on the bottom.
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*
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* Names follow the Pi 3 wrapper convention (BCM GPIO numbers like
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* "GPIO14" plus power/ground labels) so example wires using those names
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* resolve to the same physical position on every Pi model.
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*/
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export interface PinInfo {
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name: string;
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x: number;
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y: number;
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signals: string[];
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}
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const PIN_X_START = 20;
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const PIN_X_STEP = 10;
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const PIN_Y_TOP = 10;
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const PIN_Y_BOT = 20;
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const PI_PIN_NAMES: Record<number, string> = {
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1: '3V3', 2: '5V',
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3: 'GPIO2', 4: '5V',
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5: 'GPIO3', 6: 'GND',
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7: 'GPIO4', 8: 'GPIO14',
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9: 'GND', 10: 'GPIO15',
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11: 'GPIO17', 12: 'GPIO18',
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13: 'GPIO27', 14: 'GND',
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15: 'GPIO22', 16: 'GPIO23',
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17: '3V3', 18: 'GPIO24',
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19: 'GPIO10', 20: 'GND',
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21: 'GPIO9', 22: 'GPIO25',
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23: 'GPIO11', 24: 'GPIO8',
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25: 'GND', 26: 'GPIO7',
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27: 'ID_SD', 28: 'ID_SC',
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29: 'GPIO5', 30: 'GND',
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31: 'GPIO6', 32: 'GPIO12',
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33: 'GPIO13', 34: 'GND',
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35: 'GPIO19', 36: 'GPIO16',
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37: 'GPIO26', 38: 'GPIO20',
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39: 'GND', 40: 'GPIO21',
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};
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export function buildPi40PinHeader(): PinInfo[] {
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const pins: PinInfo[] = [];
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for (let col = 0; col < 20; col++) {
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const oddPin = col * 2 + 1; // top row
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const evenPin = col * 2 + 2; // bottom row
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const px = PIN_X_START + col * PIN_X_STEP;
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pins.push({
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name: PI_PIN_NAMES[oddPin] ?? `P${oddPin}`,
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x: px,
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y: PIN_Y_TOP,
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signals: [],
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});
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pins.push({
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name: PI_PIN_NAMES[evenPin] ?? `P${evenPin}`,
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x: px,
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y: PIN_Y_BOT,
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signals: [],
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});
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}
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return pins;
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}
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