58 lines
952 B
JavaScript
58 lines
952 B
JavaScript
'use strict';
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let { Driver } = require( './driver' );
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let fs = require( 'fs' );
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class PimoroniUnicorn extends Driver {
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constructor() {
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super();
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this.spi = false;
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}
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/**
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* Write buffer to the SPI device if possible
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*/
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write( buffer = false ) {
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if ( this.spi === false) {
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if ( fs.existsSync( '/dev/spidev0.0' ) ) {
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let SPI = require( 'pi-spi' );
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this.spi = SPI.initialize( '/dev/spidev0.0' );
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} else {
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console.warn( 'Device path \'/dev/spidev0.0\' was unavailable.' );
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return;
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}
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}
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if ( buffer === false ) {
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buffer = this.getBuffer();
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}
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this.spi.write(
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Buffer.concat(
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[
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new Buffer( [ 0x72 ] ),
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buffer
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]
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),
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function ( err ) {
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if ( err ) {
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throw 'Failed writing buffer';
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}
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}
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);
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}
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/**
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* Close lingering SPI device for test runner
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*/
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cleanup() {
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if ( this.spi !== false ) {
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this.spi.close();
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}
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}
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}
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exports.PimoroniUnicorn = PimoroniUnicorn; |