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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 LPS25H "MEMS pressure sensor: 260-1260 hPa absolute digital output | 5 /// API for LPS25H "MEMS pressure sensor: 260-1260 hPa absolute digital output |
6 /// barometer" chip using the I2C bus. | 6 /// barometer" 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 lps25h; | 9 library lps25h; |
10 | 10 |
11 import 'dart:typed_data'; | 11 import 'dart:typed_data'; |
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90 var x = msb << 8 | lsb; | 90 var x = msb << 8 | lsb; |
91 return x < 0x7fff ? x : x - 0x10000; | 91 return x < 0x7fff ? x : x - 0x10000; |
92 } | 92 } |
93 | 93 |
94 int _signed24(int msb, int mb, int lsb) { | 94 int _signed24(int msb, int mb, int lsb) { |
95 var x = msb << 16 | mb << 8 | lsb; | 95 var x = msb << 16 | mb << 8 | lsb; |
96 return x < 0x7fffff ? x : x - 0x1000000; | 96 return x < 0x7fffff ? x : x - 0x1000000; |
97 } | 97 } |
98 } | 98 } |
99 | 99 |
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