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Hello.

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Welcome back.

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In this lesson we should take a look at another digital input output example.

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This lesson also teach us how to unlock sets in locked panes.

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So some of the pins on a wire microcontroller because they are used for other functions by default they

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are locked in order to use them.

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We need to unlock them.

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This lesson is going to show us how to perform such on lock in so I'm going to create a new project

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over here.

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Create this new vision project or save Main.

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We have projects.

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Come over here.

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Great new photo for it.

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I call this GPI you unlock it

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and then we didn't fold our creative forward GPO a unlock in and then team 4C.

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One two three.

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U h 6 p.m..

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Select the board.

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Okay.

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Over here.

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She says isolate the core device isolate the startup over here like this.

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Okay.

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And Target over here.

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I'm going to see a Tim 4C One two three and I'm going to expand their source group or select Oh.

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Change the name to AP and GONNA COME TO TARGET OPTIONS set the X all to 16 over here and debug outcrop

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down in select SD link select still areas I CDI yeah And over here I'll take this.

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And then.

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Okay.

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And then.

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Okay come over here right click each new item.

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See and then I'll give it a name.

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Main here like this.

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Right.

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And I'm going to bring our pin out.

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Going copy and paste our pin up here so that we know which pins we are dealing with right to proceed

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by including my microcontroller header followed by right clicking include this over here like this.

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So in this example we're going to use the switch too which is connected to PFC row and we'll use this

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switch too because p of zero is locked.

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By default it's connected to something known as the enemy.

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And because of this by default it is locked.

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If we want to configure it we've got to tell the microcontroller we've got to sort of take extra steps

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in order to use PFO 0 right and unjust and enabling the pin to because of that would practice with P.F.

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0 in this course.

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In this lesson.

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So come over here.

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Create the main enemy over here

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and open and close and we're going to initialize clock access to port F so RC GC GPA will register pass

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you X

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to zero over here like this.

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Once that is done so to unlock the pin we've got to access the Dethklok register as a block register

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we've got to access the clock register and write a particular proc code to it to there's a particular

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32 bit value we need to write this register in order for you to unlock and the value we need to write

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this time is this one here we need to write 0 x for C for F for 3 and 4 b in order to unlock PSU.

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So I'm going to come over here and I'm going to access GPI or port F and then the lock register and

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then I'm going to write this file due to the lock register

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core this

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unlock value like this

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right.

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I'm going to write this so once we've written this value to the unlock once we've written this to the

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lock register we have to take another step we have to access to see our register and enable the um the

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bids for PSU before we can configure it so to do that I'm going to come over here and see GPI.

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F

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and then see R and then I'm going to set the pin 0 the bits corresponding to 0 high and I'm going to

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do that by simply writing your ex 0 1 and you know if I expand this this corresponds to bit zero off

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the of this nimble being set high.

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Once that is done I'll put some committee actually

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and over here we've seen

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on lock commits register so this the commits register we first need to unlock the comet's register before

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we're able to tell the comet's registered to make PFC real configurable.

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Once that is done we can proceed with a normal sequence by accessing the direction register.

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I'll say keep you f over here.

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Ah.

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And then I'll say 0 x says you X over here and your x 0 8.

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We still work in your X A2 actually because we're dealing with the green entity which is this one here

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P F three the green and the DP F 3 0 8 like this.

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Right.

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And we can expand this to C we set in 0 8 as outputs so as your aids gives us binary one two three four

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and one one two three.

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Right.

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So this corresponds to P.F. 3 we set an output once that is done.

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We accessed the enable registered GPI or f the end and we set both our switch and both our switch and

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our P F three which is the elder pin as these two pins.

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So they switch is connected to peer four over here.

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Four bit four so bit voice zero one two three four.

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So by here to get here for we simply do 0 x 1 0 and this one here corresponds to 4.

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So we change this to 8 over here.

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So we're dealing with PFC you over here right.

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So we want to set SPF 0 1 to enable PSU.

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So we simply need to change this bit here to 1 2 what we have to do in hexadecimal is we've got to do

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0 0 0 4 zeros and then 1 0 0 1.

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Right.

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So we've got to have this in hexadecimal form so we can simply pass the number nine here.

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This corresponds to 0 x 0 9 so x 0 9 here would set both our sets.

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Both our PSU and P F three US digital teams.

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That's what we're doing here.

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I'll put a comment here.

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Right.

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We've got to enable the pull up register come over here and see GPA you f and then P U R pull up is

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connected to our bits 0 of port F so I say is your x.

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Sure wonder why here to enable it.

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And once that is done we can come over here and do what we did before we can say while 1 and we have

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to read the State of the GPL FDA to register and perform a bit twice and with which pin 0 and c to come

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over here and see if GPL u f data register and 0 x 0 1.

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If this is false because this is also an active Lupin.

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If this is false it means that the button has been pressed right.

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If this forced then what we want to do is

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turn on our ability and we do that by seeing GP I o f the LSD is connected to P F 3 which is your x

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8 a data register true 2 x 8.

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Want to set this high.

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If this not if this is not a case we can point out before getting it brackets here actually

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if this is not a case we can put an LS condition here.

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Else we open close and in here we see a GP.

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F

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data and then we use the amber sunshine and to add a sign here to just disable this bit like this.

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So once this is done we can build and see what it looks like.

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Click over here to build.

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Now let's download onto our board.

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Quint Click here to download onto the board and it's downloaded.

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Now let's see what we have.

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Click over here and I say press the switch.

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No one would say press I say.

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And I say and I say press switch to here which is connected to PFC row.

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We can see the LCD on.

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You can see the LCD tan on how about we comment out a code.

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These new lines we added the unlock lines.

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Let's see what happens if we fail to unlock the PFC row.

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So I reveal this and I don't go down to the board.

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So these green LCD is on because P FS you over here PFC over here and it's locked.

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St..

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Reed zero when we read PFC row.

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It's locked.

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We get a values you.

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Once we unlock it then it is associated to the switch the S.W. W2 here and DSW too is an octave low

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as W2.

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So once we unlock it it states becomes high with without we pressing it.

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When we press it it goes slow but when it's locked it is zero.

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Once it's unlocked it becomes an active low switch and by active low it means its default state is high.

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When we press.

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And then of course load to going to comments this.

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So now we unlock the pin click over here to build click here to download onto the board and I can see

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it's unlocked now and the ladies off because it's octave low because this condition is was met.

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Now.

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Right.

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I'm going to press it and I can see it comes on I say.

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Press So this order is for this lesson.

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If you have any questions at all just let me know and I shall see you in the next lesson.

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Have a good day.