Dia antes primera install

node_modules/i2c-bus/integration-test/sync-many-instances.js

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+'use strict';
+
+const i2c = require('../');
+
+const DS1621_ADDR = 0x48;
+const DS1621_CMD_ACCESS_TH = 0xa1;
+const DS1621_CMD_ACCESS_TL = 0xa2;
+
+const TSL2561_ADDR = 0x39;
+const TSL2561_CMD = 0x80;
+const TSL2561_REG_ID = 0x0a;
+
+const useBusMoreThanMaxFdTimes = _ => {
+  // Assuming that less than 2000 files can be opened at the same time,
+  // open and close /dev/i2c-1 2000 times to make sure it works and to ensure
+  // that file descriptors are being freed.
+  for (let i = 1; i <= 2000; i += 1) {
+    const i2c1 = i2c.openSync(1);
+    i2c1.readWordSync(DS1621_ADDR, DS1621_CMD_ACCESS_TL);
+    i2c1.closeSync();
+  }
+};
+
+const useMultipleObjectsForSameBusConcurrently = _ => {
+  const buses = [];
+
+  // Make sure many Bus objects can be opened and used for the same I2C bus at
+  // the same time.
+  for (let i = 1; i <= 128; i += 1) {
+    buses.push(i2c.openSync(1));
+  }
+  buses.forEach(bus => bus.readWordSync(DS1621_ADDR, DS1621_CMD_ACCESS_TL));
+  buses.forEach(bus => bus.closeSync());
+};
+
+const useTwoObjectsForSameBusConcurrently = _ => {
+  const ds1621 = i2c.openSync(1);
+  const tsl2561 = i2c.openSync(1);
+  const ds1621TempHigh = ds1621.readWordSync(DS1621_ADDR, DS1621_CMD_ACCESS_TH);
+  const tsl2561Id = tsl2561.readByteSync(TSL2561_ADDR, TSL2561_CMD | TSL2561_REG_ID);
+
+  console.log('  ds1621TempHigh: ' + ds1621TempHigh);
+  console.log('  tsl2561Id: ' + tsl2561Id);
+};
+
+useBusMoreThanMaxFdTimes();
+useMultipleObjectsForSameBusConcurrently();
+useTwoObjectsForSameBusConcurrently();
+
+console.log('ok - sync-many-instances');
+