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Hello, welcome back.

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In this lesson, we're going to see how to use cues, cues will be used to transfer data from one task

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to another or from a task to an interrupt service routine or from the interrupt service routine to a

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task.

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Basically, you can think of cues, US message boxes that you can use to transmit a piece of information

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from a task to another task.

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OK, I'm going to make a copy of one of our simplest project, O Select.

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Maybe project number four over here, TASC Priorities, copy and paste.

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And then I call this number 14.

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Working with Kyuss.

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Nick.

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Where is it this is it, number 14, open this.

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May not see it over here.

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I'm going to.

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I'm going to clean what we have, yeah.

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I'm going to clean our task Croatian.

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So that we start from scratch, we'll be using different tasks.

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Yeah, OK, so in this experiment, we're going to have two tasks, the sender and the receiver.

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The sender is going to send something and we expect to receive it from the receiver.

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OK, one other thing we have to do is.

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We have to include cues to our project.

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Let me show you what I mean.

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Let's come to free to see over here.

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In here you see we have task that H included.

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We have to include tutorage to have access to the cube APIs to also include over here.

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And task not is included because when we created the very first project from Cuba, makes a default

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task was included to a project, that is why we have this already included for us.

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So our security over here.

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Like this.

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OK, so now I'll come over here, like I said, we're going to have two tasks.

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Oh, just put your prototypes here.

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We're going to have the task function.

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We're going to have one called.

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Send the task.

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And we know the nature of the task function, it takes one argument, which is a pointer, and we often

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call that PVG parameters.

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You can call it whatever you want.

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And then I'm going to copy this and then I'll paste this over here and then I'll call this receiver

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task.

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OK, and I'm going to create Taj condos as well.

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I'll say TASC.

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No, take over here and then.

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I say send a home to.

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Then receive a Honda

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like this, OK, once that is done, I'm going to come over here and I'm going to create a queue, I'll

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come over here and then to create a queue, we create a Honda for it.

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We going to when we create the queue, the queue is going to return a handle and is from the Honda that

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we can use to send and receive data from the queue or to access the queue.

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OK, so secu Honda just like we have type Honda type the rescue Honda type Q handwrote over here.

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We're going to call this year queue.

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Let's see this queue starts the.

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Yes.

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Are we spelling you correctly?

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Yeah, tops, correct.

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OK, so once that is done, I'm going to come in here and the first thing I'll do is create a queue,

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right?

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So to create a Q we used to Q create function.

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This function takes two arguments.

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The first argument is the length of the Q and the second argument is the is the the item size of the

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Q and the item size is basically based on the length of the Q.

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Let me show you what I mean.

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I'm going to see Q Execute, create.

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That's the name of the function, execute, create over here and I'm going to pass.

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I'm going to pass, I want five elements and what is the size of the queue?

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Well, it's going to be size of.

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The size of each item, so the second argument is the size of each item.

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Sorry, the second argument is the size of each item of the queue.

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So the items will be of size you in to.

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OK, so and this will return to Hondo, which we shall store here.

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OK, so this will we end up with, right, and then once this is done, we're going to go ahead to create

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our Task X task, create.

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And the first argument is the task function, so I'm going to start off with this is the task.

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And then the second argument is the name of the task, which is simply a string.

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Then following that, the stock going to give it a stock of one hundred and then following that.

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The the next document is the task parameter.

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We do not have a parameter and then the task handle what we want to study under the priority, first,

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I'm given that priority of one.

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And then finally, Dindo, I want to store this in the hand of variable.

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We created.

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So past the address here.

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Like this.

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OK, then I'm going to copy this.

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And paste this over here and I'll rename this to receive a task, the task function becomes receive

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a task over here and this word here becomes a receiver and then the handler here becomes receiver Hondo

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over here like this.

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OK, so we've created our tasks.

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We have to implement the task functions.

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And then before we forget, we've got to start our scheduler.

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So I'll see if the task starts.

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Scheduler.

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Like this, OK, so I'm going to implement these tasks, I'll copy them.

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Push them over here, the first one open and close, the second one open and close, because it's a

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task I'm going to give the infinite loop in here like this open and close and then here as well.

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Open and close.

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OK, that looks good, so I'm going to come over here and I'm going to, you know, Ascender, we're

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going to create a number of local variables.

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One, to hold the data we wish to to send and another one would hold the status.

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So I'll come over here and then into 30 to underscore.

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OK, you know, see value to send.

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Let's say we wish to send a year 2015 over there and then I'm going to have a base type, yeah, this

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will give us the status of the Q based type unaskable t, I'll call this huge status.

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Okay.

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So to send we have to we have to use the Q Senate function, this function takes three arguments.

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The first argument is the handle of the Q that you want to send to.

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The second argument is the value you want to send.

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And the third argument is like the timeout.

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How long do you want to wait?

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OK, so I'm going to come over here and say, excuse, send and then send here has to be capital.

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Q requires an equal right here.

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The first document, the name of our Q is the Yaku over here controversy.

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You page this over here.

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The value to send this is what we want.

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Is it going to pass this Ambersons sign here?

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Why did you send time out?

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We're going to pass you here and this will retain the status and I'm going to store it in our Q status

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variable here, OK?

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So this argument, like I said, it's the time out, so this is the maximum amount of time we want the

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the queue to wait in the blocked states.

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For data to be for space to become available in it, so should in case the cubie be full, should in

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case there is no space in the queue, we want to wait for X amount of time.

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For space to be available so that we can send this new piece of data, but when we put zero here, it's

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as if put zero here means we do not want to wait at all.

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This will return immediately as it detects that the queue is full in a similar way.

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We can put a time value here.

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We can pass wait for 50 VMS or 250 times, etc. but we pass in zero, meaning just return when it's

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full.

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You need no wait.

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OK, so that's what that means.

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And then so we've, we've sent this, we return this.

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We can use this to check whether it was successful.

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So we're going to see if it is successful or not.

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So I'm going to see if queue status.

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It's not equal to you, please pass, please pass is like true, this is defined in free ARTUS.

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So this is simply a saying.

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If it's not equal to true, then we want to make use of our printf say printf over here erro perhaps

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we can see data could not be sent.

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Then I return you line over here.

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Right, and we can put a bit of delay here or see for over here.

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And I equals zero, I is less than 100000 a plus plus European, and we close over here like this.

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OK, so this descender, how about a receiver over here in the receiver?

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We're going to have a number of local variables, too.

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I'm going to have INT 32 that escort and this is going to be value received.

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This is where we will store what we receive and then we're going to have we're going to allow the receiver

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to wait.

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So I'm going to create a hundred times over here by calling our PDM Static's.

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So I see a constant over here.

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Constance.

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To type Scottie.

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And then I say, wait time over here, which time over here, I'm going to say this because CDMs.

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To takes.

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What we want to do is say we passed 100 here, in a sense, we end up with one hundred is which time.

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So over here to receive we used a Q receive excuse function.

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The first document of this function is the Q handle the Q the handle to the Q from which we want to

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receive.

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The second argument is where to start to receive data.

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And the third argument is how long to wait the time out value.

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So I'm going to say X.

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Excuse receive over here, the first argument is the Q name.

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Q Hondo Yaku, it is called Okay.

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And the next argument is where to store it.

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We store in it and received value over here.

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Okay.

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And then.

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And then the final arguments this week's time.

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OK, and this is going to return a status which we can declare.

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I'm going to do what I did here based type.

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We're going to declare a base type here to hold this Q status here.

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And over here, we can print.

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Well, we received.

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We can see if it is.

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If it's received, we can check for base status what is true or not, and then print something or.

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If it is false, we do not print something OK, over here, I can see.

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I can see if you.

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If Cubase excuse, that is.

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Of course, pass, then we can print what we received print off.

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We said the value received is.

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Percentage of I hear.

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One, two, three, carriage return, new line, then we want to do is pass our volume here, value

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received.

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Okay.

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Then we can have an air condition here and over here, we can say printf.

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Good to see error could not receive.

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Here, Aero Club.

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Could not receive.

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OK.

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So we're looking good.

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Let's build and see what we have.

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Click over here to build.

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We have three arrests.

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OK.

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I see what does this one see?

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Percentage de.

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Aren't we using OK, let's expand here.

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Give us the specify it to use.

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So we should use Helda.

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It's trying to say this is a warning.

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So deal with the warnings.

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First percentage dhody over here.

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Red here implies error.

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OK, so it's a yes.

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That's cute.

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It's not included here.

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This makes your spelling of Honda as correct, the spelling is correct, so it's about including our

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culotte each.

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OK.

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OK, OK, so let's see what happened, right?

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Remember, we, um, we included our culotte itchin free artist Cifas.

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Well, we included it because we saw task that H included here.

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But we know what happens if you including the that file.

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It's not accessible from other files.

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So obviously by including this year, it's not accessible in our mind or Cifas.

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So we can include this in our May not H file alcott's culotte H from here, located from here.

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And then I would open the not H open declaration and then in here I would include Kittridge.

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But I wanted to I want to find out where Task H is included.

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Let's see if we are to reach what is in the.

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Free artist of the house config Dorridge Portable that each.

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OK, OK, let's go back to Main and let's open CMC Storage, we can solve this problem, but I just

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want to put it where Task H is rather than playsets.

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Anyway, this is CMC Storage.

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So Task not exist, CMC Storage.

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That is why we have access to the task functions you may not see.

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So then we're going to include Kudo over here as well.

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No, let's wait and see what we left with.

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OK, no error, no warning, we're looking good.

225
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OK.

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Right, let's download it onto a board or click over here working with number 14 here.

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I say, OK.

228
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And then I'll quick to switch.

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I'm going to open Realto, so I select my port, my border region and my ports, I'm going to click

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to open it and then I'm going to drop this here a bit.

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They're not quick to run.

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OK, but as I see, the value received is to 50, so we receive in it.

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OK.

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Writes.

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So those successful.

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We're going to stop.

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I'm going to play this again and see when I stop this, so we would have to do actually although we

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received it, we had a hard fought.

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00:19:59,570 --> 00:20:08,240
And the reason the reason our Ewart's is not cooperating with us is because of the way it is implemented

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here.

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There is a huge time out value in this.

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You ought to transmit function.

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So what are we going to do?

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Is we going to we're going to write our own implementation of you are to transmit a simplified version

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of you are to transmit where we're going to transmit to use in the data register itself.

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And perhaps that would allow the US to function quicker than it is functioning currently.

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And we may also want to increase some of its configuration parameters.

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Let's see what the board rate is quite high, but we can go higher if we want.

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And then the speed.

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Yeah, so anyway, we would start off with a Ewart's, we would we would implement a new you are to

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function so that where we retargeted to print, if we don't use how you are to transmit, we would use

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a simple function that, you know, reads the data register of the other peripheral directly.

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OK, so we'll do that in the next lesson.