1 00:00:00,630 --> 00:00:00,950 Hello. 2 00:00:00,960 --> 00:00:01,650 Welcome back. 3 00:00:01,650 --> 00:00:08,910 In this lesson we're going to see how to set up GPA you interrupt for our team 4C 1 2 3 microcontroller 4 00:00:09,390 --> 00:00:15,060 and this simple experiment Well we're going to do is we going to be controlling one output device in 5 00:00:15,050 --> 00:00:22,500 a wire infinite while one loop in the main function and when we press our switch one and switch to on 6 00:00:22,500 --> 00:00:29,970 the TVC board and interrupt the screen to occur and upon occurence of this interrupt the content of 7 00:00:30,030 --> 00:00:36,300 an interrupt service routine or an interrupt handler is going to execute and this interrupt handler 8 00:00:36,690 --> 00:00:39,450 we're going to be blinking our green algae in there. 9 00:00:39,690 --> 00:00:45,240 And remember these are just used as examples entities are just examples you can replace the blinking 10 00:00:45,240 --> 00:00:53,160 of the LRT with your own complex algorithm more complex control of any you know eye or device you are 11 00:00:53,160 --> 00:00:58,470 dealing with so I'm going to create a new project by coming over the New Vision project 12 00:01:05,650 --> 00:01:07,580 or create a photo for the project. 13 00:01:07,590 --> 00:01:11,010 I call this GPL you interrupt GPL you underscore interrupt 14 00:01:13,560 --> 00:01:18,060 and the project is going to be called GPL you interrupt to swirl 15 00:01:25,220 --> 00:01:27,440 and I'm going to like the board to foresee. 16 00:01:27,440 --> 00:01:32,500 1 2 3 0 page 6 p.m. and this is it. 17 00:01:32,650 --> 00:01:33,760 Okay. 18 00:01:33,850 --> 00:01:40,070 And over here understand this I'm going to select core on the device which starts up over here and then. 19 00:01:40,120 --> 00:01:40,870 Okay. 20 00:01:40,950 --> 00:01:42,770 Going to rename this to the name of the board. 21 00:01:42,790 --> 00:01:47,440 Tim 4C One two three. 22 00:01:47,560 --> 00:01:49,070 Going to click a dropdown over here. 23 00:01:49,090 --> 00:01:55,090 So group I'm going to rename it to AP AP and I'm to come over here. 24 00:01:55,090 --> 00:02:02,310 Target options X total I'm going to set to 16 megahertz debug group down over here. 25 00:02:02,310 --> 00:02:06,400 Still there is ICD I am going to click over here reset and run. 26 00:02:06,490 --> 00:02:07,040 Okay. 27 00:02:07,060 --> 00:02:07,370 And then. 28 00:02:07,420 --> 00:02:08,380 Okay. 29 00:02:08,590 --> 00:02:12,160 Once they start I'm going to right click you I turn it a C file. 30 00:02:12,160 --> 00:02:13,370 I'll give it a name. 31 00:02:13,480 --> 00:02:18,080 Man over here and a right click to include the port header. 32 00:02:18,100 --> 00:02:19,890 This is it. 33 00:02:20,140 --> 00:02:22,150 Once they start we're going to dive straight in. 34 00:02:22,180 --> 00:02:28,530 We start off by enabling our entities in the course we're going to use the switch one and switch two. 35 00:02:28,780 --> 00:02:33,740 We need to unlock the switch one which is locked by default. 36 00:02:33,830 --> 00:02:42,730 Gonna open one stop with its main course and open enclosure over here and I'm going to start off by 37 00:02:42,730 --> 00:02:47,530 enabling clock access to port F so see system control and then I come here. 38 00:02:47,540 --> 00:02:56,640 RC GC GPL you and she's your ex over here to see you once that's done port. 39 00:02:56,770 --> 00:02:59,410 F pins you it's locked. 40 00:02:59,410 --> 00:03:03,030 So we need to unlock this in order to be able to use this switch. 41 00:03:03,070 --> 00:03:12,550 When I say GPL you f over here I'm going to access the lock register and I'm going to pass the special 42 00:03:12,640 --> 00:03:19,310 unlock value which is this value over here. 43 00:03:19,590 --> 00:03:24,800 They put a comment here for you on lock PFC. 44 00:03:26,200 --> 00:03:27,480 That's what we're doing here. 45 00:03:27,520 --> 00:03:34,910 Once that's done I'm going to access the comments register and make it configurable so I see a GPL you 46 00:03:34,950 --> 00:03:43,390 f c are over here and then I'm going to punch your ex through one and then once they shut down I'm going 47 00:03:43,390 --> 00:03:53,350 to go to GPL u f and then look over here and then I'm going to post here right. 48 00:03:54,050 --> 00:04:01,390 So once this is done we've got to configure port f for this switch in the LCD so I'm going to come down 49 00:04:01,390 --> 00:04:01,810 here 50 00:04:03,670 --> 00:04:18,910 G P i o f direction register I'm gonna see it and you cross and I'm going to see one one over here 51 00:04:26,060 --> 00:04:27,620 see it's your x 1 one 52 00:04:32,800 --> 00:04:41,250 essentially you're saying make P F 1 A P of 4 on the PFC your 53 00:04:46,780 --> 00:04:48,910 input penis that's what we're doing here. 54 00:04:49,000 --> 00:04:58,680 By disabling them once they started we're going to make P F 3 into output pin we're going to set P.F. 55 00:04:58,690 --> 00:05:05,680 3 2 and 1 into output pins and these are where the ladies are connected so come over and see you can 56 00:05:05,680 --> 00:05:14,320 you f direction register pass your ex over here it's your E 57 00:05:17,520 --> 00:05:18,620 right. 58 00:05:18,750 --> 00:05:19,800 Once that's done. 59 00:05:19,860 --> 00:05:26,520 Gonna come down here and I'm going to set them all up Teach to parents by setting the stage to enable 60 00:05:26,840 --> 00:05:37,620 them to kill you f or I hear the n gonna pass your effects point F over here and I'm going to enable 61 00:05:37,620 --> 00:05:46,860 pull up registers for PFC Ram P.F. one to do this I'm going to see GPO F by a p r register 62 00:05:49,620 --> 00:05:53,190 and I'm going to pass your X one one over here 63 00:06:05,200 --> 00:06:16,170 P.F. 4 and PFC Maria once that's done well I'm going to do is disable interrupt globally by saying disabled 64 00:06:16,170 --> 00:06:19,900 by our queue we need to do this before we configure interrupt. 65 00:06:20,100 --> 00:06:23,550 I'm going to configure P for PFC row for fallen edge. 66 00:06:23,550 --> 00:06:27,330 Trigger interrupt to do this. 67 00:06:27,330 --> 00:06:32,600 I start off by saying GPL you f i s. 68 00:06:32,610 --> 00:06:38,610 And then course gratuities signing is your ex on one 69 00:06:48,060 --> 00:06:54,040 making them each sensitive. 70 00:06:54,500 --> 00:07:07,890 I'm just gonna say GPA F over here IP and then to X on one and then we're going to make sure we're detecting 71 00:07:07,920 --> 00:07:19,200 forward we're going to set it to detect falling edge by saying apply f GPA you f I E3 and over here 72 00:07:25,730 --> 00:07:28,020 2 x 1 1 73 00:07:40,800 --> 00:07:46,650 wants test done we've got to clear any prior interrupt and then unmask to interrupt 74 00:07:49,110 --> 00:07:52,980 or come down here and she tell you f 75 00:07:56,850 --> 00:08:05,790 I she r you want to punch your ex when one over here. 76 00:08:11,910 --> 00:08:16,220 And then I said GPL you f I am 77 00:08:19,960 --> 00:08:30,380 you know punch your ex one one over here. 78 00:08:34,240 --> 00:08:39,670 Right after that we've got to enable interrupt in the end Vic and set the priority. 79 00:08:39,670 --> 00:08:47,410 Show the are what you pay your interrupt port F is Ira q 30 to anybody interrupted said a priority I'm 80 00:08:47,410 --> 00:08:48,520 going to do and Vic 81 00:08:53,260 --> 00:09:02,830 interrupts priority thirty over here and I'm going to say three shifts five over here we're going to 82 00:09:02,830 --> 00:09:04,540 set it to a priority of three 83 00:09:17,890 --> 00:09:27,760 Mr. Stone I'm going to a neighborhood interrupt by doing and Vic I as a neighbor will register in next 84 00:09:27,770 --> 00:09:35,570 year over here you course sure x 4 and then one two three four five six seven seven zeros 85 00:09:46,820 --> 00:09:47,500 right. 86 00:09:48,270 --> 00:09:49,510 So this is it. 87 00:09:49,530 --> 00:09:55,530 This should set up or interrupt our switches for detecting fallen edges whenever I fallen agents detected 88 00:09:55,590 --> 00:09:56,460 an interrupt. 89 00:09:56,500 --> 00:09:56,940 Okay. 90 00:09:57,750 --> 00:10:03,630 Let's continue with our main function I'm just going to put some content into you while one loop over 91 00:10:03,630 --> 00:10:03,960 here 92 00:10:07,410 --> 00:10:15,320 and over here we going to blink the red LCD so I'm gonna tell you f data register then I'm gonna pass 93 00:10:15,330 --> 00:10:21,380 your x 2 over here and I'm going to see it the M S 94 00:10:24,570 --> 00:10:26,450 see you want to blink. 95 00:10:26,490 --> 00:10:31,680 That's one hundred over here and we're going to disable it by doing GPL you f 96 00:10:36,000 --> 00:10:40,930 data register then I'll put Ampersand to it it over here 97 00:10:45,170 --> 00:10:54,250 sure to like this delay the same amount today and this one hundred yeah okay. 98 00:10:54,440 --> 00:11:00,650 Once that's done we can implement or interrupt handler I'm going to come down here to put the interrupt 99 00:11:00,680 --> 00:11:03,650 callback function here so it's void 100 00:11:07,050 --> 00:11:15,220 and it has to be written this way void GPL you f underscore handler 101 00:11:19,950 --> 00:11:24,960 then I'm going to pass for it in here and open close. 102 00:11:24,980 --> 00:11:27,650 This right here is 103 00:11:33,020 --> 00:11:37,010 the red LCD in here we're going to target the green Naledi. 104 00:11:37,100 --> 00:11:41,030 We're going to talk good screen for three times whenever the interrupt occurs. 105 00:11:46,800 --> 00:11:48,740 We can use a loop to accomplish this. 106 00:11:48,760 --> 00:11:50,780 I'll save for it. 107 00:11:50,790 --> 00:11:53,100 Are you close your eyes. 108 00:11:53,100 --> 00:12:00,070 Less than three hours plus plus over here open and close. 109 00:12:00,540 --> 00:12:10,410 I'm going to do GPL you f data register then I'm going to pass a pax sure page over here then delay 110 00:12:10,420 --> 00:12:14,250 m s gonna pass. 111 00:12:14,340 --> 00:12:20,560 Why should I help pass one hundred then turn it back off GPA you f 112 00:12:23,170 --> 00:12:29,210 data and then no sunshine and an activity over here. 113 00:12:29,410 --> 00:12:38,100 X 0 8 delay I can clear this one hundred here like this. 114 00:12:40,780 --> 00:12:48,700 So once that is done we need to clear the interrupt flag before we return to our shape over here. 115 00:12:48,720 --> 00:12:56,610 Keep your f ICR in or pass your X one one over here. 116 00:13:09,550 --> 00:13:10,960 This one last step we could take. 117 00:13:10,960 --> 00:13:16,780 It's not absolutely necessary but sometimes the interrupt flag is not cleared. 118 00:13:16,780 --> 00:13:19,330 We've got to force read it to clear it. 119 00:13:19,610 --> 00:13:28,150 So create a volatile variable here so volatile and call this read back and we're going to force read 120 00:13:28,150 --> 00:13:28,990 it. 121 00:13:28,990 --> 00:13:39,510 Here have I seen read back you cause GPL you f ICR register like this. 122 00:13:39,730 --> 00:13:45,960 So the reason we've got some arrows is because we don't have our shoot or delay function here. 123 00:13:46,060 --> 00:13:52,870 You can bring an actual function using the timer that we learned how to build or you can just use the 124 00:13:52,900 --> 00:13:55,090 pseudo delay function it's quick to work with. 125 00:13:55,090 --> 00:14:08,170 I just use the pseudo delay here Floyd delay in this thing to delay the open enclosure over here and 126 00:14:08,170 --> 00:14:16,480 then I have my nested loop to perform the delay for me also for int i equals zero. 127 00:14:16,650 --> 00:14:26,530 It's less than that delay amount passed by the user by plus plus and open enclosure by here in the loop 128 00:14:26,530 --> 00:14:39,270 RC for int j because you j is less than three thousand one hundred and eighty J plus plus open enclosure 129 00:14:39,430 --> 00:14:45,350 here and then I'm going to fetch the prototype of this put it up here and we don't need to fetch the 130 00:14:45,350 --> 00:14:47,480 prototype of the interrupt handler. 131 00:14:47,540 --> 00:14:49,150 The system recognizes this. 132 00:14:49,160 --> 00:14:54,070 So you need not fetch the prototype here and it has to be written exactly this way. 133 00:14:54,410 --> 00:14:55,230 Right. 134 00:14:55,230 --> 00:14:58,060 So once this is done we can build and see what we have. 135 00:14:58,060 --> 00:15:03,950 I'm going to click here to build let's get it on our board and see how it looks. 136 00:15:04,160 --> 00:15:09,880 So I'm going to click here to download onto a board and I can see the red LDS blinking. 137 00:15:09,890 --> 00:15:15,120 No I'm going to press a wire switches and see what happens. 138 00:15:15,170 --> 00:15:17,200 Nothing happens here. 139 00:15:17,570 --> 00:15:18,550 Nothing happens yes. 140 00:15:18,590 --> 00:15:21,470 Well let's see. 141 00:15:21,650 --> 00:15:22,100 Okay. 142 00:15:22,100 --> 00:15:25,660 It's because we we've not enabled global interrupt. 143 00:15:25,760 --> 00:15:29,930 Remember before we configured to interrupt we had to disable it globally. 144 00:15:29,930 --> 00:15:36,710 So I'm going to come here and enable that underscore underscore and enable I argue like this right. 145 00:15:36,740 --> 00:15:42,160 And when we press our button regardless of the button with press we want to see that green LCD blink. 146 00:15:42,510 --> 00:15:43,500 OK. 147 00:15:43,700 --> 00:15:51,200 I'm going to click over here then it's going to toggle so fast we wouldn't see we wanted to talk the 148 00:15:51,230 --> 00:15:52,940 three times right. 149 00:15:52,940 --> 00:15:53,890 This the new could. 150 00:15:53,920 --> 00:15:58,120 The red is still blinking because the red is what's in the main function. 151 00:15:58,130 --> 00:16:01,530 The main function is infinite loop over here. 152 00:16:01,530 --> 00:16:09,530 So I'm gonna press the push button that you can see the green is blinking and then this one too. 153 00:16:09,930 --> 00:16:14,470 So whenever I would press the push button the interrupter cares and what is within the interrupt handler 154 00:16:14,480 --> 00:16:16,200 is executed. 155 00:16:16,670 --> 00:16:25,420 Right here the green entity comes on when we press this right. 156 00:16:25,490 --> 00:16:28,340 So this order is what is less than you have any questions at all. 157 00:16:28,550 --> 00:16:30,980 Just send me a message and I shall see you later. 158 00:16:30,980 --> 00:16:31,570 Have a good day.