Created
March 8, 2016 01:46
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var SerialPort = require('serialport').SerialPort | |
var bl = require('bl') | |
module.exports = connect | |
function connect (device, cb) { | |
var port = new SerialPort(device, { baudrate: 115200, highWaterMark: 1 }) | |
var timer = null | |
var initialized = false | |
var queue = [] | |
port.on('open', function () { | |
reset() | |
timer = setInterval(tryToEnterBinMode, 20) | |
port.on('data', checkForBinMode) | |
}) | |
function reset () { | |
port.write([0x0d, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d, 0x23]) | |
} | |
function tryToEnterBinMode () { | |
port.write([0x00]) | |
} | |
function checkForBinMode (data) { | |
if (data.toString() === 'BBIO1') { | |
clearInterval(timer) | |
port.removeListener('data', checkForBinMode) | |
startSPI() | |
} | |
} | |
function startSPI () { | |
port.write([0x01]) // SPI mode | |
port.write([0b01000000]) // disable power supplies | |
port.write([0b10001010]) // 3.3v pin mode | |
port.write([0b01100111]) // 8 MHz clock | |
setTimeout(function () { | |
port.write([0b01001000]) // wait 1 second then enable power to avoid spike | |
}, 1000) | |
initialized = true | |
while (queue.length) { | |
write(queue.shift()) | |
} | |
} | |
function write (data) { | |
if (initialized) { | |
var output = bl() | |
output.append(data) | |
for (var i = 0; i < output.length; i += 16) { | |
var chunk = output.slice(i, i + 16) | |
port.write([0b00010000 + chunk.length - 1]) | |
port.write(chunk) | |
} | |
} else { | |
queue.push(data) | |
} | |
} | |
return write | |
} |
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