|
|
|
'use strict';
|
|
|
|
|
|
|
|
var helper = helper || {};
|
|
|
|
|
|
|
|
helper.mspQueue = (function (serial, MSP) {
|
|
|
|
|
|
|
|
var publicScope = {},
|
|
|
|
privateScope = {};
|
|
|
|
|
|
|
|
privateScope.queue = [];
|
|
|
|
|
|
|
|
privateScope.portInUse = false;
|
|
|
|
|
|
|
|
/**
|
|
|
|
* This method is periodically executed and moves MSP request
|
|
|
|
* from a queue to serial port. This allows to throttle requests,
|
|
|
|
* adjust rate of new frames being sent and prohibit situation in which
|
|
|
|
* serial port is saturated, virtually overloaded, with outgoing data
|
|
|
|
*
|
|
|
|
* This also implements serial port sharing problem: only 1 frame can be transmitted
|
|
|
|
* at once
|
|
|
|
*
|
|
|
|
* MSP class no longer implements blocking, it is queue responsibility
|
|
|
|
*/
|
|
|
|
publicScope.executor = function () {
|
|
|
|
|
|
|
|
/*
|
|
|
|
* if port is blocked or there is no connection, do not process the queue
|
|
|
|
*/
|
|
|
|
if (privateScope.portInUse || serial.connectionId === false) {
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
var request = privateScope.get();
|
|
|
|
|
|
|
|
if (request !== undefined) {
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Lock serial port as being in use right now
|
|
|
|
*/
|
|
|
|
privateScope.portInUse = true;
|
|
|
|
|
|
|
|
//TODO implement timeout scenario
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set receive callback here
|
|
|
|
*/
|
|
|
|
MSP.putCallback(request);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Send data to serial port
|
|
|
|
*/
|
|
|
|
serial.send(request.requestBuffer, function (sendInfo) {
|
|
|
|
if (sendInfo.bytesSent == request.requestBuffer.byteLength) {
|
|
|
|
/*
|
|
|
|
* message has been sent, check callbacks and free resource
|
|
|
|
*/
|
|
|
|
if (request.onSend) {
|
|
|
|
request.onSend();
|
|
|
|
}
|
|
|
|
privateScope.portInUse = false;
|
|
|
|
}
|
|
|
|
});
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
|
|
|
privateScope.get = function () {
|
|
|
|
return privateScope.queue.shift();
|
|
|
|
};
|
|
|
|
|
|
|
|
publicScope.flush = function () {
|
|
|
|
privateScope.queue = [];
|
|
|
|
};
|
|
|
|
|
|
|
|
publicScope.freeSerialPort = function () {
|
|
|
|
privateScope.portInUse = false;
|
|
|
|
};
|
|
|
|
|
|
|
|
publicScope.put = function (mspRequest) {
|
|
|
|
privateScope.queue.push(mspRequest);
|
|
|
|
};
|
|
|
|
|
|
|
|
publicScope.getLength = function () {
|
|
|
|
return privateScope.queue.length;
|
|
|
|
};
|
|
|
|
|
|
|
|
setInterval(publicScope.executor, 20);
|
|
|
|
|
|
|
|
return publicScope;
|
|
|
|
})(serial, MSP);
|