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1 // Copyright (c) 2015, the Fletch project authors. Please see the AUTHORS file | 1 // Copyright (c) 2015, the Dartino project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE.md file. | 3 // BSD-style license that can be found in the LICENSE.md file. |
4 | 4 |
5 /// API for HTS221 "capacitive digital sensor for relative humidity and | 5 /// API for HTS221 "capacitive digital sensor for relative humidity and |
6 /// temperature" chip using the I2C bus. | 6 /// temperature" chip using the I2C bus. |
7 /// | 7 /// |
8 /// Currently this has only been tested with a Raspberry Pi 2 and the Sense HAT. | 8 /// Currently this has only been tested with a Raspberry Pi 2 and the Sense HAT. |
9 library hts221; | 9 library hts221; |
10 | 10 |
11 import 'dart:typed_data'; | 11 import 'dart:typed_data'; |
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120 var status = _device.readByte(_statusReg); | 120 var status = _device.readByte(_statusReg); |
121 if ((status & 0x03) == 0x03) break; | 121 if ((status & 0x03) == 0x03) break; |
122 } | 122 } |
123 } | 123 } |
124 | 124 |
125 int _signed16(int msb, int lsb) { | 125 int _signed16(int msb, int lsb) { |
126 var x = msb << 8 | lsb; | 126 var x = msb << 8 | lsb; |
127 return x < 0x7fff ? x : x - 0x10000; | 127 return x < 0x7fff ? x : x - 0x10000; |
128 } | 128 } |
129 } | 129 } |
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