56 lines
1.9 KiB
JavaScript
56 lines
1.9 KiB
JavaScript
#!/usr/bin/env node
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/*
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* Author: Brendan Le Foll <brendan.le.foll@intel.com>
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* Copyright (c) 2014 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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var m = require('mraa'); //require mraa
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// helper function to go from hex val to dec
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function char(x) { return parseInt(x, 16); }
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x = new m.I2c(0)
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x.address(0x77)
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// initialise device
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if (x.readReg(char('0xd0')) != char('0x55')) {
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console.log("error");
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}
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// we want to read temperature so write 0x2e into control reg
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x.writeReg(char('0xf4'), char('0x2e'))
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// read a 16bit reg, obviously it's uncalibrated so mostly a useless value :)
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console.log(x.readWordReg(char('0xf6')))
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// and we can do the same thing with the read()/write() calls if we wished
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// thought I'd really not recommend it!
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buf = new Buffer(2)
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buf[0] = char('0xf4')
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buf[1] = char('0x2e')
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console.log(buf.toString('hex'))
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x.write(buf)
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x.writeByte(char('0xf6'))
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d = x.read(2)
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