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node_modules/i2c-bus/example/i2cdetect-quick.js

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