1 00:00:00,680 --> 00:00:01,080 Hello. 2 00:00:01,100 --> 00:00:01,970 Welcome back. 3 00:00:01,970 --> 00:00:06,980 So in the previous lesson we saw how to configure and detect GPI. 4 00:00:06,980 --> 00:00:16,310 You interrupt and we used GPI report F and we were able to execute what was in the GPI you put f interrupt 5 00:00:16,310 --> 00:00:20,360 handler whenever it switch one or switch to is pressed. 6 00:00:20,510 --> 00:00:26,630 But I suppose that left you wondering how do we differentiate switch one from switch two since we were 7 00:00:26,630 --> 00:00:29,010 using the same interrupt handler for that. 8 00:00:29,180 --> 00:00:36,110 What if we want a different set of instructions to execute when it's a switch one and then another different 9 00:00:36,110 --> 00:00:43,610 set for switch to how do we do that given that both of them are connected to port F and we've got just 10 00:00:43,610 --> 00:00:50,990 one port f interrupt request handler so we're going to show that in this lesson I'm going to create 11 00:00:50,990 --> 00:00:58,910 a copy of the last project and I'll paste this copy here and then rename it to version 2 and then we 12 00:00:58,910 --> 00:01:00,020 continue from there. 13 00:01:02,480 --> 00:01:11,630 Port underscore fee 2 Over here then I'm going to open this and I'm going to close this project then 14 00:01:11,630 --> 00:01:14,530 I'm going to open fee 2 and then I'll open from here 15 00:01:18,670 --> 00:01:19,060 right. 16 00:01:19,150 --> 00:01:26,770 So this our previous projects and we've got GPL you put F over here aren't we totally into green LCD. 17 00:01:26,860 --> 00:01:34,330 Three times when the GPL you put a forecast in this case when we press any of these switches we have 18 00:01:34,370 --> 00:01:36,580 on our team that to our seaboard. 19 00:01:36,610 --> 00:01:42,550 Now what we're going to do is we're going to let one switch target with a red LCD and another one is 20 00:01:42,650 --> 00:01:44,070 toggle the green one. 21 00:01:44,080 --> 00:01:48,370 So currently we are totally in the red already in the infinite while one loop. 22 00:01:48,430 --> 00:01:53,260 I'm going to delete that so that there'll be nothing happening in a while one loop is just going to 23 00:01:53,260 --> 00:01:53,830 be empty 24 00:01:56,650 --> 00:02:06,600 like this and to detect which interrupt or cared we're going to use an if and check the Empire's register 25 00:02:06,600 --> 00:02:11,910 to see whether the interrupt is from pin for or pin 0. 26 00:02:12,120 --> 00:02:14,040 So let's do that now. 27 00:02:14,250 --> 00:02:17,190 I'm going to come up here. 28 00:02:17,470 --> 00:02:21,540 I'm going to just bring it here because we need what is up here. 29 00:02:21,540 --> 00:02:31,050 So we're going to start by saying well GPL you f minus 30 00:02:34,360 --> 00:02:37,410 is not equal to zero. 31 00:02:37,870 --> 00:02:41,870 Then we open this block and then we'll check if it is. 32 00:02:41,870 --> 00:02:47,820 Which one by saying if you call your f am I s 33 00:03:01,630 --> 00:03:05,020 and you're X once you're 34 00:03:24,120 --> 00:03:27,120 if this is the case then we're going to target with the. 35 00:03:27,870 --> 00:03:34,300 I'm just going to fudge this code over here to target the green entity gonna fetch all of this actually 36 00:03:36,100 --> 00:03:38,230 all of this screen to be fetched 37 00:03:43,290 --> 00:03:53,180 and pasted in here so if this is the case wanted to go the green LCD three times right. 38 00:03:53,260 --> 00:03:55,140 So we have to come out here and do. 39 00:03:55,140 --> 00:03:55,930 Else if 40 00:04:01,080 --> 00:04:12,540 you play your f m s and sure of X through one and this chick this is chick 41 00:04:18,560 --> 00:04:27,590 chick if esta Picchu which is PFC PSU if that's the case I'm going to paste this I'm going to change 42 00:04:27,590 --> 00:04:38,570 it to be the red LCD and we have to do is change this to 0 2 over here and shoot you over here right. 43 00:04:38,570 --> 00:04:41,030 Often the interrupt should should should. 44 00:04:41,030 --> 00:04:44,870 CLAIRE Well with Claire it and when we read back. 45 00:04:44,960 --> 00:04:51,920 But if all of this doesn't make sure the interrupt is Claire we've got to force it to Claire and to 46 00:04:51,920 --> 00:04:52,310 do that. 47 00:04:52,340 --> 00:04:56,200 I'm gonna come over here and say. 48 00:04:56,220 --> 00:05:12,080 Else open a block here and see GPI you f I see are you cause you f m my ass. 49 00:05:12,350 --> 00:05:18,680 And we do read back because you play F I see ya. 50 00:05:19,810 --> 00:05:20,260 Right. 51 00:05:21,040 --> 00:05:27,400 So now we should be able to execute we should be able to execute based on the. 52 00:05:27,450 --> 00:05:36,870 We should be able to execute different instructions based on the um the pin so this block here 53 00:05:40,530 --> 00:05:50,070 is for switch one and this other block here for switch to CODIS PSU ISO 54 00:05:54,420 --> 00:05:56,310 PFC or ISIS touch here 55 00:06:03,420 --> 00:06:04,280 right. 56 00:06:04,320 --> 00:06:07,310 So like I said we're just using the utilities as examples here. 57 00:06:10,310 --> 00:06:11,500 Right. 58 00:06:11,600 --> 00:06:14,720 So let's build and see how it looks. 59 00:06:14,930 --> 00:06:20,430 Click here to build let's get it on our board. 60 00:06:20,430 --> 00:06:20,850 Right. 61 00:06:20,850 --> 00:06:25,680 So before we download onto our board we first need to enable global interrupt. 62 00:06:25,680 --> 00:06:30,840 Over here we disabled interrupt globally and we've got to enable interrupt back in order to be able 63 00:06:30,840 --> 00:06:31,630 to interrupt. 64 00:06:32,110 --> 00:06:35,540 So C enable our over here. 65 00:06:35,540 --> 00:06:38,700 And once that is done are revealed by clicking over here 66 00:06:42,100 --> 00:06:48,110 and click here to download onto the board. 67 00:06:48,550 --> 00:06:50,980 And once that's done we can see. 68 00:06:51,020 --> 00:06:52,620 So this our board. 69 00:06:52,610 --> 00:06:55,440 Now there is no LCD blinking at all. 70 00:06:55,530 --> 00:07:02,990 And we said we should blink the LCD when once we should blink the LCD based on the interrupt that occurs 71 00:07:03,020 --> 00:07:07,220 and with attached interrupt to our switch zero and switch one. 72 00:07:07,280 --> 00:07:10,630 So if I press the switch you can see the green energy blink. 73 00:07:10,700 --> 00:07:17,210 If I press this the red LCD is blinking and this is because an interrupt or cared and we just use an 74 00:07:17,300 --> 00:07:23,840 entity blink in here as an example you can put any type of code here you can put an algorithm here that 75 00:07:23,840 --> 00:07:31,830 would be executed if the switch is pressed or if the GPL or pin detect detects a fall in edge. 76 00:07:32,480 --> 00:07:35,030 So that's all there is for this lesson if you have any questions at all. 77 00:07:35,030 --> 00:07:38,930 Just send me a message or leave them in the questions area and I shall see you later. 78 00:07:38,930 --> 00:07:39,670 Have a good day.