1 00:00:00,780 --> 00:00:01,420 Hello. 2 00:00:01,500 --> 00:00:02,720 Welcome back. 3 00:00:02,730 --> 00:00:09,060 So this is this state of Iowa GPL u in its function or subroutine. 4 00:00:09,240 --> 00:00:11,670 We initialize clock access. 5 00:00:11,670 --> 00:00:18,100 And over here we set GPL u p f one as output. 6 00:00:18,690 --> 00:00:22,930 And then we digitally enabled P.F. 1. 7 00:00:22,950 --> 00:00:34,020 Now we're going to unlock our PFC row and then we can add green as another output and then add the switches. 8 00:00:34,020 --> 00:00:38,890 So I'm gonna come over here right after initializing clock. 9 00:00:38,910 --> 00:00:41,600 I'm going to unlock it. 10 00:00:41,660 --> 00:00:46,140 Oh she went on lock PFC through by saying Lord 11 00:00:49,410 --> 00:00:51,090 are 1 with the GPA f 12 00:00:54,430 --> 00:01:00,520 0 she could register and then load r 0 13 00:01:03,290 --> 00:01:07,670 we did lock key which we could lock a key simply lucky 14 00:01:12,940 --> 00:01:14,600 and then start a. 15 00:01:14,840 --> 00:01:18,460 So I'd say store our 0 16 00:01:21,810 --> 00:01:22,220 R1 17 00:01:29,580 --> 00:01:30,000 right. 18 00:01:31,500 --> 00:01:36,510 So this would unlock this will not PFC or for us. 19 00:01:36,510 --> 00:01:40,310 So now once we've done that we've got to commit. 20 00:01:42,960 --> 00:01:45,120 I'm gonna come over here and say 21 00:01:47,810 --> 00:01:58,470 Lord oh Lord a comet's register Lord I want a course GPA U F C R R and then I'm simply going to move 22 00:02:00,650 --> 00:02:01,770 or simply use 23 00:02:05,660 --> 00:02:12,800 user x f f over here and then store out as you are one 24 00:02:18,000 --> 00:02:18,660 right. 25 00:02:19,530 --> 00:02:22,980 So we've unlocked and we've committed. 26 00:02:22,980 --> 00:02:31,650 Next we have our direction register here over here we just set in P F one as output. 27 00:02:32,460 --> 00:02:39,150 So what I'm gonna do is I'm going to add the green LCD and to add that in C language I'll simply add 28 00:02:39,150 --> 00:02:46,410 this and do Ellie de Green and this also will be set over here to add it's in assembly. 29 00:02:46,410 --> 00:02:48,300 I'll have to use the O operation 30 00:02:53,560 --> 00:02:54,230 um 31 00:02:57,600 --> 00:03:00,510 so I'm gonna start off first. 32 00:03:00,660 --> 00:03:05,400 I can't read with the current value of our zero. 33 00:03:05,730 --> 00:03:13,560 Once I start I'm going to perform another or iris zero then a green. 34 00:03:13,560 --> 00:03:17,220 This would add green to it. 35 00:03:17,220 --> 00:03:17,780 Right. 36 00:03:17,800 --> 00:03:20,530 As simple as that. 37 00:03:21,110 --> 00:03:22,870 So does the direction register. 38 00:03:23,030 --> 00:03:29,510 Remember to set a pin to to output in the direction register you've got to set the bit to 1. 39 00:03:29,510 --> 00:03:35,030 That's why we're doing this to set to input you've got to set it to 0 but because the default state 40 00:03:35,030 --> 00:03:35,600 is 0. 41 00:03:35,600 --> 00:03:41,580 I'm not going to set anything for the switches caused by default I already input. 42 00:03:41,690 --> 00:03:45,360 That is why I'm only doing it for the M for the output. 43 00:03:45,380 --> 00:03:51,790 The red and green lady now on digital enable from digital enable to digitally enable a pin you've got 44 00:03:51,790 --> 00:03:54,970 a set it built into digital enabled register to 1. 45 00:03:54,980 --> 00:04:02,800 So we've got a set one for the LCD screen one for elderly red one for switch one one for switch to. 46 00:04:03,260 --> 00:04:11,650 So this was going to be a little red like this in C language a Lady Green 47 00:04:16,790 --> 00:04:24,720 switch one switch to this is going to be like this right. 48 00:04:24,860 --> 00:04:31,970 So I can either use a plus sign a lady red plus a lady green plus which one plus switch to or I can 49 00:04:31,970 --> 00:04:35,170 simply use the operator the. 50 00:04:35,330 --> 00:04:42,590 Yeah perform an operation so I'm simply going to do this and then this becomes 51 00:04:45,850 --> 00:04:46,740 Lady Green. 52 00:04:46,800 --> 00:04:50,680 This becomes a sloppy one. 53 00:04:50,680 --> 00:04:51,430 This becomes 54 00:04:54,300 --> 00:04:56,210 messed up too right. 55 00:04:57,710 --> 00:05:01,510 So once that is done we need to set the um the pool up. 56 00:05:01,640 --> 00:05:06,570 We need to go to the pool up register and sets the pool up for our switches. 57 00:05:06,590 --> 00:05:07,990 I'm gonna come over here. 58 00:05:08,350 --> 00:05:08,770 Okay. 59 00:05:08,780 --> 00:05:10,120 I forgot the C language. 60 00:05:10,130 --> 00:05:11,260 I've not done that for a while. 61 00:05:11,280 --> 00:05:20,620 Also GPL you f pull up register and I'm going to enable it for switch one and switch to like this. 62 00:05:20,650 --> 00:05:40,910 So an assembly load R1 because GPA F P you are on the score R and then load r 0 are 1 and then we do 63 00:05:40,910 --> 00:05:44,550 an all operation or r 0 64 00:05:47,560 --> 00:06:04,970 with switch one and then all our 0 we switch to and then we can store no SDR r 0 R1 and then we return 65 00:06:05,060 --> 00:06:09,990 would be X a la like this okay. 66 00:06:10,380 --> 00:06:10,840 Right. 67 00:06:11,280 --> 00:06:14,620 So we're looking good now. 68 00:06:14,880 --> 00:06:24,630 Now we can um we have to write a subroutine to two to root D pin to read the buttons I should say I'm 69 00:06:24,630 --> 00:06:26,280 going to delete a while 70 00:06:29,380 --> 00:06:36,460 I'm gonna delete or delay and blink subroutines here we don't need them I'm gonna write a new subroutine 71 00:06:36,460 --> 00:06:37,630 for GPL you read 72 00:06:48,250 --> 00:06:52,480 and I'm going to load the data register load 73 00:06:59,920 --> 00:07:06,880 GPL you f on this court data on the score register then 74 00:07:10,150 --> 00:07:20,620 load C row are 1 here and then I'm going to check I'm gonna check if this switches suppressed and I 75 00:07:20,620 --> 00:07:26,260 will do that by course the content of the data register is going to be an R1 so I'm gonna use the end 76 00:07:27,130 --> 00:07:35,530 operation I'll end r 0 the content of Iris Zero which I you a check without data on pressed or not 77 00:07:38,740 --> 00:07:40,550 when I use three or approaches. 78 00:07:40,660 --> 00:07:45,420 Just think of the third one as the destination when I do this. 79 00:07:46,920 --> 00:07:48,980 It's the same as doing this right. 80 00:07:49,000 --> 00:07:52,350 Do not be confused okay. 81 00:07:52,390 --> 00:07:59,010 So I'm going to say check PFC row and pay for what I do pressed or not. 82 00:07:59,620 --> 00:08:00,010 Right. 83 00:08:00,040 --> 00:08:06,560 And the result is going to be put the output of this and operation is going to be an Irish euro. 84 00:08:06,910 --> 00:08:11,440 So I'm gonna do B X LR to return from the subroutine 85 00:08:14,320 --> 00:08:14,910 right. 86 00:08:21,930 --> 00:08:22,300 Okay. 87 00:08:22,450 --> 00:08:26,210 So um let's see what we have. 88 00:08:26,260 --> 00:08:28,240 This is our main. 89 00:08:28,600 --> 00:08:31,270 We start off by GPL U in it. 90 00:08:31,570 --> 00:08:33,730 We don't we no longer have blink. 91 00:08:34,000 --> 00:08:42,070 But what we have is GPL you read so I'm gonna come over here once we've initialize our GPL you will 92 00:08:42,070 --> 00:08:45,580 read it by doing branch to GPI you read 93 00:08:49,180 --> 00:08:50,630 on this will read both. 94 00:08:50,740 --> 00:08:52,470 Um this will read on what you call it. 95 00:08:52,500 --> 00:08:56,640 Both of the the switches and the results is going to be in Irish euro. 96 00:08:56,640 --> 00:08:59,790 So now let's compare what is in Irish euro. 97 00:08:59,900 --> 00:09:01,820 So I'm going to use this GMP instruction. 98 00:09:01,830 --> 00:09:07,130 Compare the content of Irish euro which switch pressed 99 00:09:14,180 --> 00:09:21,360 and then we'll say if so if it is switch one pressed then we say BQ here. 100 00:09:21,470 --> 00:09:26,390 If a switch one press then we're going to create another subroutine for what we want to execute. 101 00:09:26,390 --> 00:09:28,270 In the case of switch one pressed. 102 00:09:29,030 --> 00:09:35,830 So I'm gonna come down here and outputs which one pressed here. 103 00:09:35,880 --> 00:09:36,690 Switch one. 104 00:09:37,210 --> 00:09:38,000 Yeah. 105 00:09:38,150 --> 00:09:40,730 And what we want to do is turn on the red LCD. 106 00:09:42,860 --> 00:09:44,990 So sorry go there. 107 00:09:46,310 --> 00:09:48,740 So I'm simply going to move the red LCD 108 00:09:51,420 --> 00:09:54,000 simply going to say move 109 00:09:57,300 --> 00:10:04,740 I wish you pushed uh put this into our sewer a little red and I'm going to branch into another subroutine 110 00:10:04,740 --> 00:10:12,600 that would I would turn on the LCD which we shall call a lady on a lot of branch and going on here and 111 00:10:12,600 --> 00:10:12,930 then 112 00:10:15,660 --> 00:10:24,180 um we can return to the um to loop once we've done this once we've executed and turn on the LCD we want 113 00:10:24,180 --> 00:10:33,120 to return to the top of the main loop while one loop so see a b loop over here and I'm gonna put loop 114 00:10:33,120 --> 00:10:35,720 here this label here right. 115 00:10:35,940 --> 00:10:45,880 So we we have to implement a lady on we have LCD on over here this reads the um 116 00:10:48,970 --> 00:10:54,100 this reads our data register and then okay. 117 00:10:54,160 --> 00:11:02,230 We've got a delete this and yeah this is our lady on and I changed a spelling I made it into a lady 118 00:11:02,260 --> 00:11:03,680 on like this. 119 00:11:03,670 --> 00:11:09,430 So if so which one is price we're going to put a lady red into our zero. 120 00:11:09,460 --> 00:11:10,230 Right. 121 00:11:10,270 --> 00:11:15,010 So then our jury is gonna come to early on and then we take what is in our sewer and put into a data 122 00:11:15,010 --> 00:11:18,800 register and in effect the red readily do turn on right. 123 00:11:18,820 --> 00:11:21,750 This what we get if switch one is pressed. 124 00:11:22,360 --> 00:11:29,890 Okay now let's do the same for switch to when I say RCMP 125 00:11:33,530 --> 00:11:45,060 are 0 switch to pressed BQ on this call switch to. 126 00:11:45,140 --> 00:11:47,480 So we're going to right switch to here 127 00:11:54,370 --> 00:11:57,620 this should be switch one this is switch to 128 00:12:00,270 --> 00:12:14,830 and we start off by moving the green LCD move our zero LCD green and then Bill and a score early on 129 00:12:15,980 --> 00:12:19,170 and then we print Park to the top of the loop to start again 130 00:12:24,220 --> 00:12:25,500 right. 131 00:12:25,590 --> 00:12:26,620 So now let's check. 132 00:12:28,720 --> 00:12:34,360 Um we've checked the switch one switch to and then um I think I can leave it here. 133 00:12:34,380 --> 00:12:36,140 I'll leave it for your assignment. 134 00:12:36,150 --> 00:12:41,060 I'll leave on exercise for you to implement both pressed and no price. 135 00:12:41,060 --> 00:12:44,660 What should happen if both of them are pressed or if none of them is pressed. 136 00:12:44,700 --> 00:12:47,340 That will be your exercise for this lesson. 137 00:12:48,360 --> 00:12:49,860 So let's see what we have. 138 00:12:52,300 --> 00:12:52,770 Okay. 139 00:12:52,810 --> 00:12:57,120 After switch to I'm gonna branch back to loop so I'm gonna be here 140 00:13:01,210 --> 00:13:01,690 okay. 141 00:13:03,070 --> 00:13:04,460 Let's pull it and see what we have. 142 00:13:06,190 --> 00:13:06,750 Okay. 143 00:13:06,790 --> 00:13:08,540 Click it to build. 144 00:13:08,600 --> 00:13:14,720 I've caught one error it says switch one not defined 145 00:13:20,450 --> 00:13:23,470 here I put two underscores here. 146 00:13:24,010 --> 00:13:28,000 Let's build to peel successfully installed onto the board 147 00:13:31,390 --> 00:13:33,550 it's finished downloading. 148 00:13:33,560 --> 00:13:41,380 As you can see when I press this the green LCD is on when I press this the red LCD on green red green 149 00:13:41,710 --> 00:13:44,830 red green red light. 150 00:13:45,160 --> 00:13:51,550 So like I said for your exercise I would like you to implement what happens when both buttons are pressed 151 00:13:51,970 --> 00:13:53,900 and when none of them is pressed. 152 00:13:53,950 --> 00:13:55,080 None of them is pressed. 153 00:13:55,090 --> 00:13:58,300 I would like for you to turn off the LCD. 154 00:13:58,300 --> 00:14:04,270 Now you can see that the last LCD the last one that I pressed is still on on the board. 155 00:14:04,420 --> 00:14:09,640 So if nothing is being pressed I'd like for you to implement a subroutine though. 156 00:14:09,640 --> 00:14:10,600 Turn it off. 157 00:14:10,600 --> 00:14:18,160 And if both are pressed I'd like for you to implement you know to turn on the blue LCD or turn on both 158 00:14:18,220 --> 00:14:20,590 LCD when they're both pressed at the same time. 159 00:14:21,130 --> 00:14:25,630 And if you face the questions with regards to the exercise just let me know and I'll see you in the 160 00:14:25,630 --> 00:14:26,290 next lesson. 161 00:14:26,290 --> 00:14:27,030 Have a nice day.