49 lines
1.3 KiB
JavaScript
49 lines
1.3 KiB
JavaScript
'use strict';
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// When run, this program will output the same information as the
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// command 'i2cdetect -y -q 1'
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// An error message will be printed on the BeagleBone as it doesn't
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// support the SMBus quick command.
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// This program is similar to i2cdetect.js, but it uses writeQuickSync
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// rather than receiveByteSync to detect devices.
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const fs = require('fs');
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const i2c = require('../');
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const i2c1 = i2c.openSync(1);
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const EBUSY = 16; /* Device or resource busy */
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const scan = (first, last) => {
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fs.writeSync(0, ' 0 1 2 3 4 5 6 7 8 9 a b c d e f');
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for (let addr = 0; addr <= 127; addr += 1) {
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if (addr % 16 === 0) {
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fs.writeSync(0, '\n' + (addr === 0 ? '0' : ''));
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fs.writeSync(0, addr.toString(16) + ':');
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}
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if (addr < first || addr > last) {
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fs.writeSync(0, ' ');
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} else {
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try {
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i2c1.writeQuickSync(addr, 0);
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fs.writeSync(0, ' ' + addr.toString(16)); // device found, print addr
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} catch (e) {
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if (e.errno === EBUSY) {
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fs.writeSync(0, ' UU');
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} else {
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fs.writeSync(0, ' --');
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}
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}
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}
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}
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fs.writeSync(0, '\n');
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};
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if (!i2c1.i2cFuncsSync().smbusQuick) {
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console.log('Error: Can\'t use SMBus Quick Write command on this bus#');
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} else {
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scan(0x3, 0x77);
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}
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