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node_modules/i2c-bus/integration-test/scan.js

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+'use strict';
+
+const lodash = require('lodash');
+const assert = require('assert');
+const i2c = require('../');
+
+const TSL2561_ADDR = 0x39;
+const DS1621_ADDR = 0x48;
+
+const bus = i2c.openSync(1);
+
+const scanSyncRange = _ => {
+  const devices = bus.scanSync(TSL2561_ADDR, DS1621_ADDR);
+
+  assert(devices.length === 2, 'expected 2 devices');
+  assert(
+    devices[0] === TSL2561_ADDR,
+    'expected device at address 0x' + TSL2561_ADDR.toString(16)
+  );
+  assert(
+    devices[1] === DS1621_ADDR,
+    'expected device at address 0x' + DS1621_ADDR.toString(16)
+  );
+
+  console.log('ok - scan');
+};
+
+const scanSyncForSingleDevice = _ => {
+  const devices = bus.scanSync(DS1621_ADDR);
+
+  assert(devices.length === 1, 'expected 1 device');
+  assert(
+    devices[0] === DS1621_ADDR,
+    'expected device at address 0x' + DS1621_ADDR.toString(16)
+  );
+
+  scanSyncRange();
+};
+
+const scanRange = _ => {
+  bus.scan(TSL2561_ADDR, DS1621_ADDR, (err, devices) => {
+    assert(!err, 'can\'t scan range');
+    assert(devices.length === 2, 'expected 2 devices');
+    assert(
+      devices[0] === TSL2561_ADDR,
+      'expected device at address 0x' + TSL2561_ADDR.toString(16)
+    );
+    assert(
+      devices[1] === DS1621_ADDR,
+      'expected device at address 0x' + DS1621_ADDR.toString(16)
+    );
+
+    scanSyncForSingleDevice();
+  });
+};
+
+const scanForSingleDevice = _ => {
+  bus.scan(DS1621_ADDR, (err, devices) => {
+    assert(!err, 'can\'t scan for single device');
+    assert(devices.length === 1, 'expected 1 device');
+    assert(
+      devices[0] === DS1621_ADDR,
+      'expected device at address 0x' + DS1621_ADDR.toString(16)
+    );
+
+    scanRange();
+  });
+};
+
+const scanDefaultRange = _ => {
+  const addresses = bus.scanSync();
+
+  bus.scan((err, devices) => {
+    assert(!err, 'can\'t scan default range');
+    assert(lodash.isEqual(addresses, devices), 'sync and async scan differ');
+
+    scanForSingleDevice();
+  });
+};
+
+scanDefaultRange();
+