1 00:00:02,210 --> 00:00:02,740 Hello. 2 00:00:02,810 --> 00:00:03,370 Welcome back. 3 00:00:03,450 --> 00:00:09,410 So we still need general purpose input output section and in this lesson we're going to demonstrate 4 00:00:09,410 --> 00:00:15,880 how to create an external input interrupt function using the and 132 cubit next. 5 00:00:15,980 --> 00:00:16,930 Well we want to do it. 6 00:00:16,940 --> 00:00:24,290 We want to see the interrupt lines connected to the various GPO pins and we can find that from the reference 7 00:00:24,740 --> 00:00:28,770 the reference module of the estimate that the microcontroller. 8 00:00:28,770 --> 00:00:33,940 And this time we don't need to go to Google to look for a cause call your vision has assembled the books 9 00:00:33,940 --> 00:00:34,380 here. 10 00:00:34,750 --> 00:00:37,640 I could just come over here and go to the reference module. 11 00:00:37,640 --> 00:00:46,070 This particular book double click to open and once it opens I can search extend or interrupt again it 12 00:00:46,070 --> 00:00:50,640 is extend or interrupt slash defense control of this what we're looking for. 13 00:00:50,750 --> 00:00:53,650 It's on this page here one hundred and ninety eight. 14 00:00:53,680 --> 00:00:54,900 Or just click it. 15 00:00:55,100 --> 00:00:56,750 And then what I want is down here. 16 00:00:56,750 --> 00:01:01,440 I just want to see which interrupts line my push button is connected to. 17 00:01:01,520 --> 00:01:06,910 So as we can see P A zero is connected to extend interrupts line zero. 18 00:01:07,190 --> 00:01:13,880 And if we want to use a different pin for extend or interrupt we have the option is to use to zero pieces 19 00:01:13,880 --> 00:01:16,820 you APD you use your X etc.. 20 00:01:16,880 --> 00:01:19,660 So what we need to program is to extend all interrupt lines here. 21 00:01:20,150 --> 00:01:20,800 That's good. 22 00:01:20,810 --> 00:01:23,750 And we already know where our LCD is connected. 23 00:01:23,750 --> 00:01:28,990 So we have all we need to go to Cuba makes to create a new projects to demonstrate this. 24 00:01:29,000 --> 00:01:30,510 So let's head to Cuba next. 25 00:01:30,510 --> 00:01:32,260 Now this is our own project. 26 00:01:32,270 --> 00:01:41,080 And what I'm going to do is I'm just going to create a new project or just minimize all of this this 27 00:01:41,090 --> 00:01:42,570 creates a new project from here. 28 00:01:42,590 --> 00:01:48,760 You project and I'm still using the same boat as the estimate. 29 00:01:48,760 --> 00:01:59,170 That's a two disco board by microcontrollers to the same double click this office cleaned up paints 30 00:01:59,170 --> 00:02:01,960 by just going to clamping out. 31 00:02:01,960 --> 00:02:03,290 Yes. 32 00:02:03,310 --> 00:02:10,370 And this time I want to activate PD to us extend or interrupt like this. 33 00:02:10,510 --> 00:02:13,280 And then we still use our PD 13. 34 00:02:13,420 --> 00:02:20,140 So keep your output to two lights up our entity and let's get another entity for this project. 35 00:02:20,720 --> 00:02:22,810 I'll just use this one here. 36 00:02:22,900 --> 00:02:23,810 I don't know which color. 37 00:02:23,830 --> 00:02:29,580 This is but I'll just use it and I'm not going to change the label so I'm just going to keep them. 38 00:02:29,630 --> 00:02:31,100 Remember them later. 39 00:02:31,450 --> 00:02:33,550 And yes this is all there is to it. 40 00:02:33,710 --> 00:02:39,900 And we have to settle on debugger or just select the zero Y overhead and it's initialized for me. 41 00:02:40,150 --> 00:02:47,260 Next I can I can leave the configuration to the default settings and over here. 42 00:02:47,330 --> 00:02:53,840 Now we have to configure to interrupt what we want to do is click the ethic and select the interrupt 43 00:02:53,860 --> 00:02:56,280 we use in the external interrupts lines here. 44 00:02:56,300 --> 00:02:59,920 So we just have to take this one here and that's all there is to it. 45 00:02:59,930 --> 00:03:06,620 And then I click OK next i click over here to generate my code and I give my project a name call it 46 00:03:06,620 --> 00:03:19,640 extend or interrupt external on the school interrupt and I'm using the call and decoded version 5 and 47 00:03:19,870 --> 00:03:22,340 I leave everything else the same I click OK 48 00:03:25,360 --> 00:03:29,970 it generates it then once it's done I click open project 49 00:03:33,820 --> 00:03:37,480 and once this is done I can just expand this and take a look at this. 50 00:03:38,150 --> 00:03:41,930 And to bind everything together I'll just rebuild the project 51 00:03:47,390 --> 00:03:53,960 so this time what we want is we want to keep our orange LCD on at all times and we can put that in the 52 00:03:53,960 --> 00:03:55,170 infinite loop here. 53 00:03:55,190 --> 00:03:59,090 I can come over here and see Hall GPI. 54 00:03:59,090 --> 00:03:59,860 All right. 55 00:04:05,200 --> 00:04:09,270 And I could just give the ports no cheaper imports D. 56 00:04:10,700 --> 00:04:14,780 And GPI you 10 13 57 00:04:19,910 --> 00:04:22,210 and I could just write it to one. 58 00:04:23,060 --> 00:04:28,120 We initialize them just go and verify this quickly pan out. 59 00:04:28,780 --> 00:04:30,470 So we have 12 and 13. 60 00:04:30,470 --> 00:04:38,270 So let's just keep the entity connected to pin twelve on all the time and let's still control the orange 61 00:04:38,360 --> 00:04:40,600 energy use in our push button. 62 00:04:40,670 --> 00:04:47,480 So when I compile this we are just going to see that one end to be on this reboot and in fact you can 63 00:04:47,480 --> 00:04:50,510 verify which entity it is from the user guide. 64 00:04:50,830 --> 00:04:56,880 And once that is done building it can reset and I can see that green entity is on. 65 00:04:56,900 --> 00:05:06,110 So we want to keep the green energy on at all times and we can have our of our button 10 on the the 66 00:05:06,110 --> 00:05:08,780 orange LRT and we can do this in the interrupt. 67 00:05:08,780 --> 00:05:11,840 So what we want is to use interrupts to do this. 68 00:05:11,840 --> 00:05:16,440 So we have to populate the interrupt callback function to do that. 69 00:05:16,500 --> 00:05:21,530 Let's just assume I don't remember the nature of the function cyclic functions that come overhead. 70 00:05:21,530 --> 00:05:28,700 I select this particular module the GPI and then I expanded and it should tell me over here how it you 71 00:05:28,700 --> 00:05:35,150 tell you extend an interrupt and it should give me the external interrupt. 72 00:05:35,510 --> 00:05:42,550 So this what I need to extend or interrupt callback so I can I have to edit this function by put in 73 00:05:43,180 --> 00:05:49,920 the code I want to execute when to interrupt OK is inside this function without using this key word 74 00:05:50,010 --> 00:05:51,360 weak key word here. 75 00:05:51,560 --> 00:05:55,270 This week key word means you can redefine the function. 76 00:05:55,430 --> 00:05:56,560 You can customize it. 77 00:05:57,200 --> 00:06:02,150 And the next time the compiler is looking for that particular function you would use the function you 78 00:06:02,150 --> 00:06:06,080 have defined without the weak keyword. 79 00:06:06,080 --> 00:06:09,990 So what I want is I just want to paste up function here and clean this here. 80 00:06:10,730 --> 00:06:16,490 And in fact I don't even need to read the pin I don't need to write the code to read the pain because 81 00:06:16,490 --> 00:06:21,850 as soon as the pen is pressed the interrupt to interrupt to detect the presence of the pin. 82 00:06:21,860 --> 00:06:29,120 So all I want to do is turn on the entity here so I can see how and I'm sure some of you are familiar 83 00:06:29,120 --> 00:06:43,740 with interrupt already rights being GPL Hootie API you pin 13 and that's all there is to it. 84 00:06:44,090 --> 00:06:56,300 And I just write to high class argument so I can build head and I'll just enable the reset and run option 85 00:06:57,980 --> 00:06:59,390 by ticking like this. 86 00:06:59,500 --> 00:07:00,110 Okay. 87 00:07:00,140 --> 00:07:00,470 And then. 88 00:07:00,470 --> 00:07:06,890 Okay then I'll download onto my boat and it's finished downloading. 89 00:07:06,930 --> 00:07:14,590 And as you can see it credibility entity is on when I press this the instructive case the audience goes 90 00:07:14,590 --> 00:07:18,220 on and I didn't put in a code to turn it back off. 91 00:07:18,220 --> 00:07:20,420 So this is what we expect. 92 00:07:20,470 --> 00:07:25,390 You can toggle here or you can do it in a form of computation here in.