forked from Apple-2-HW/Apple2-IO-RPi
75 lines
1.8 KiB
JavaScript
75 lines
1.8 KiB
JavaScript
var fs = require('fs');
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var gpio = require('onoff').Gpio;
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var out_write = new gpio(5, 'high', {activeLow: true});
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var out_read = new gpio(11, 'high', {activeLow: true});
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var out_command1 = new gpio(9, 'low', {activeLow: false});
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var out_command2 = new gpio(10, 'low', {activeLow: false});
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var out_bit3 = new gpio(22, 'low', {activeLow: false});
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var out_bit2 = new gpio(27, 'low', {activeLow: false});
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var out_bit1 = new gpio(17, 'low', {activeLow: false});
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var out_bit0 = new gpio(4, 'low', {activeLow: false});
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var in_write = new gpio(12, 'in', 'both');
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var in_read = new gpio(16, 'in', 'both');
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var in_command1 = new gpio(20, 'in');
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var in_command2 = new gpio(21, 'in');
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var in_bit3 = new gpio(26, 'in');
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var in_bit2 = new gpio(19, 'in');
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var in_bit1 = new gpio(13, 'in');
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var in_bit0 = new gpio(6, 'in');
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function onCleanUp() {
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in_write.unwatchAll();
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in_write.unexport();
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}
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function onWriteChanged(err, value) {
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if (err) {
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}
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else {
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//console.log(`value: ${value}`);
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}
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}
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number = 0;
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startTime = Date.now();
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function onReadChanged(err, value) {
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if (err) {
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}
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else {
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if (value == 1) {
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//console.log("Nibble has been read");
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out_write.writeSync(0);
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}
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else {
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writeNibble(number++);
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if(number >= 4096) {
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seconds = Date.now() - startTime;
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console.log(`Sent 2 KiB in ${seconds} milliseconds.`);
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process.exit()
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}
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}
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}
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}
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in_write.watch(onWriteChanged);
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in_read.watch(onReadChanged);
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function writeNibble(nibble) {
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out_bit3.writeSync((nibble&8)>>3);
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out_bit2.writeSync((nibble&4)>>2);
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out_bit1.writeSync((nibble&2)>>1);
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out_bit0.writeSync(nibble&1);
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out_command1.writeSync(0);
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out_command2.writeSync(0);
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out_read.writeSync(0);
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out_write.writeSync(1);
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}
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writeNibble(0);
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process.on('SIGINT', onCleanUp);
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