1 00:00:00,800 --> 00:00:01,900 Hello, welcome back. 2 00:00:02,450 --> 00:00:10,340 And this lesson, we see how to work with message cues, so we simply make a copy of the last project. 3 00:00:12,080 --> 00:00:15,890 I copy this and I'll paste this over here. 4 00:00:16,610 --> 00:00:18,620 And I call this message Kyuss. 5 00:00:35,640 --> 00:00:39,600 Then we explain this and then we open this. 6 00:00:40,690 --> 00:00:42,040 Made a seat over here. 7 00:00:43,290 --> 00:00:45,590 OK, so like we always do. 8 00:00:45,630 --> 00:00:51,090 Let's go to the documentation and find out what we need to do to create a new message. 9 00:00:51,130 --> 00:00:54,540 Q I'm going to go to our documentation over here. 10 00:00:56,450 --> 00:00:59,270 So we have to go to the queue management section. 11 00:01:01,780 --> 00:01:05,260 Let's see, there is a message queue over here. 12 00:01:13,850 --> 00:01:16,250 So there is a message you create. 13 00:01:20,060 --> 00:01:25,760 Let's click on this and the message to you also has a structure, it takes attributes like we saw for 14 00:01:25,760 --> 00:01:32,660 semaphores, the SEMAFO mutex in the tasks so we can you know, we have to define a structure for us. 15 00:01:32,690 --> 00:01:34,940 Well, let's click on voice message. 16 00:01:35,010 --> 00:01:38,360 You knew the first argument is the message counts. 17 00:01:38,960 --> 00:01:45,850 And then the second argument is the size, the message size, maximum message size invites, it says 18 00:01:45,860 --> 00:01:46,490 over here. 19 00:01:47,060 --> 00:01:52,160 And the third argument is the attributes, whether we are using attributes or not, we can personally, 20 00:01:52,160 --> 00:02:00,020 if we want or we can assign it, we can use one of the message cue attributes members such as a sign 21 00:02:00,020 --> 00:02:00,920 to cue a name. 22 00:02:01,490 --> 00:02:02,000 OK. 23 00:02:04,000 --> 00:02:10,510 So just to be consistent, we're going to define we're going to define an attribute structure for the 24 00:02:10,510 --> 00:02:12,460 message cue to start off. 25 00:02:12,490 --> 00:02:19,180 I'm going to define I'm going to create a variable to hold the message ID, because when we create the 26 00:02:19,630 --> 00:02:22,540 cue is going to return the ID. 27 00:02:22,570 --> 00:02:24,940 We want to store it somewhere so that we can access it. 28 00:02:25,720 --> 00:02:29,040 So I'll create always message cue ID type. 29 00:02:29,050 --> 00:02:32,440 I'll call this MSG covid like this. 30 00:02:33,280 --> 00:02:40,270 OK, once that is done I'm going to create the voice message, cue attribute type and I'm going to call 31 00:02:40,270 --> 00:02:43,240 this MSG cue attributes like this. 32 00:02:43,760 --> 00:02:48,160 And over here we're using just one member in the attribute structure we just given. 33 00:02:48,580 --> 00:02:50,920 It's a name we're using just the name Amber. 34 00:02:51,500 --> 00:03:00,970 OK, so once that is done, we can create the cue by calling our message cue new function and then it's 35 00:03:00,970 --> 00:03:01,540 going to. 36 00:03:03,420 --> 00:03:09,570 It's going to return the idea of the created message, so I'm going to come down here and create a message 37 00:03:09,570 --> 00:03:13,120 for you and the idea is going to be retained and stored here. 38 00:03:13,590 --> 00:03:15,300 This is going to hold five elements. 39 00:03:15,420 --> 00:03:19,270 This the size screen to hold elements of type you in 16. 40 00:03:19,680 --> 00:03:22,170 And this is the attribute we defined up here. 41 00:03:22,770 --> 00:03:31,320 OK, so once that is done, what are we going to do in this experiment is to, um, let's say use the 42 00:03:31,320 --> 00:03:31,770 red. 43 00:03:32,660 --> 00:03:37,640 LCD controller has to send something to the queue and receive it from the blue task. 44 00:03:38,180 --> 00:03:39,230 OK, so. 45 00:03:40,990 --> 00:03:46,310 I'm going to take out our mutex experiment code, this one here. 46 00:03:46,330 --> 00:03:47,350 I'm going to remove it. 47 00:03:49,530 --> 00:03:50,640 And this one here. 48 00:03:52,880 --> 00:03:57,710 OK, so what we're going to do is we agreed to. 49 00:04:00,780 --> 00:04:04,560 Create a variable over here. 50 00:04:06,940 --> 00:04:13,270 Let's see, we said our Q is going to hold you in 16 type, so I'm going to see you in 16. 51 00:04:19,950 --> 00:04:25,460 And then we're going to call this value to send we want to send the year 2050 to the queue. 52 00:04:26,110 --> 00:04:32,460 OK, so then to send we use the always message queue put function to do this. 53 00:04:32,970 --> 00:04:36,660 So I'm simply going to send this by voice message queue put. 54 00:04:37,530 --> 00:04:39,540 This is the one to send to this queue. 55 00:04:39,840 --> 00:04:42,210 So we pass on the idea of the queue here. 56 00:04:42,540 --> 00:04:43,580 Message queue ID. 57 00:04:44,400 --> 00:04:45,660 This is what we want to send. 58 00:04:46,910 --> 00:04:53,340 Over here and then the priority of the message, it's allows us to set priorities and then time out. 59 00:04:53,900 --> 00:05:00,320 OK, let's go to the documentation and find out what we mean by this priority of the message. 60 00:05:03,890 --> 00:05:04,900 Let's see, where are we? 61 00:05:06,300 --> 00:05:10,230 I'm going to click back here so that we can have all the functions. 62 00:05:11,180 --> 00:05:12,980 That's a message you put. 63 00:05:14,060 --> 00:05:16,910 OK, first argument is the message ID. 64 00:05:18,200 --> 00:05:26,150 Pointer to the buffer that contains the data you want to send in a priority and then time out over here, 65 00:05:26,150 --> 00:05:31,400 it says message priority so we can assign priority to the message and then the timeout. 66 00:05:32,420 --> 00:05:37,580 Tynemouth Value O0 in case of Norteños, so we pass in zero for no time. 67 00:05:37,820 --> 00:05:39,250 That's what we have over here. 68 00:05:39,970 --> 00:05:40,490 OK. 69 00:05:42,900 --> 00:05:50,850 So once we've sent this, then we expect to receive this somewhere, we going to use the blue led task 70 00:05:50,850 --> 00:05:51,690 to receive this. 71 00:05:52,710 --> 00:05:54,540 So we're going to declare. 72 00:05:57,110 --> 00:06:03,120 We going to declare two variables here in the blue LCD task. 73 00:06:03,140 --> 00:06:07,220 I'm going to have received message and I'm going to update. 74 00:06:07,620 --> 00:06:17,810 OK, so what I'm going to do is use the OS who has a message to get function to get the message from 75 00:06:17,810 --> 00:06:25,940 the Q The first document is the Q idea of the Q you want to get from the second document over here is 76 00:06:25,940 --> 00:06:29,850 the is the way where you want to store it. 77 00:06:31,580 --> 00:06:36,560 The third argument is the priority and then the last document is the time out. 78 00:06:36,950 --> 00:06:41,690 Over here we say wait forever and once we receive this, it's going to be stored here. 79 00:06:42,050 --> 00:06:48,890 We're going to read it and storage in our data variable and we can print this to our serial port. 80 00:06:51,860 --> 00:06:58,700 I'm making it global, just in case you want to view this and the live expressions, but we can make 81 00:06:58,700 --> 00:06:59,380 this local. 82 00:07:01,140 --> 00:07:06,310 OK, so we still have this because we made a copy of our time, a project. 83 00:07:06,320 --> 00:07:09,230 This can be removed, but I don't want to mess it up, so I'll leave it. 84 00:07:10,340 --> 00:07:12,800 So once we have this, we can print. 85 00:07:15,100 --> 00:07:24,070 We can see the message received is this, and I'll just typecast this to an end to avoid warnings, 86 00:07:25,090 --> 00:07:33,850 so we're simply using message puts and the message you get a squeakier to build. 87 00:07:39,350 --> 00:07:40,010 It's Beurden. 88 00:07:46,410 --> 00:07:47,520 We have one warning. 89 00:07:47,580 --> 00:07:48,600 I see where that is. 90 00:08:00,910 --> 00:08:07,480 Oh, so because we're not using this, OK, so the plan was to view the date or one of the variables 91 00:08:07,480 --> 00:08:08,310 in a watch window. 92 00:08:09,440 --> 00:08:13,070 Since the data is redundant, we can remove the data variable. 93 00:08:14,390 --> 00:08:14,910 OK? 94 00:08:16,400 --> 00:08:16,880 Right. 95 00:08:20,900 --> 00:08:23,250 Let's do it and see a click over here to view it. 96 00:08:28,530 --> 00:08:29,640 To build successfully. 97 00:08:31,890 --> 00:08:33,330 All right, click over here. 98 00:08:34,970 --> 00:08:35,630 I'll see. 99 00:08:36,640 --> 00:08:38,580 Keep us ASTM 30 to. 100 00:08:39,970 --> 00:08:42,160 Double click forty four over here. 101 00:08:45,990 --> 00:08:47,700 And then I'll say, OK, over here. 102 00:08:52,890 --> 00:08:53,580 It's open in. 103 00:08:56,220 --> 00:08:57,000 Click to switch. 104 00:09:00,560 --> 00:09:02,810 Then I'll give space. 105 00:09:08,110 --> 00:09:15,310 And I'll clear what we have over here, open this report, then click to run. 106 00:09:16,550 --> 00:09:24,680 OK, so the message you received is getting this number here, OK, so that is why I think I had the 107 00:09:24,680 --> 00:09:28,730 dates for before because I had tested this. 108 00:09:30,560 --> 00:09:37,040 OK, so to receive it, once we receive from the Buffa, we're going to store it in our variable outdates 109 00:09:37,040 --> 00:09:38,430 variable before we print. 110 00:09:39,150 --> 00:09:39,650 OK. 111 00:09:48,870 --> 00:09:54,920 So over here, I'll simply have a date over here. 112 00:09:56,440 --> 00:10:05,380 And I'll come over here and see when we receive the data storage in the buffer dates because received 113 00:10:05,380 --> 00:10:06,570 message indexer. 114 00:10:09,620 --> 00:10:11,000 Indexer over here. 115 00:10:12,030 --> 00:10:14,130 And this time. 116 00:10:15,200 --> 00:10:19,100 We're going to print dates, this word should be dates, not data. 117 00:10:23,600 --> 00:10:24,050 So. 118 00:10:25,990 --> 00:10:28,030 We print the deeds variable here. 119 00:10:31,830 --> 00:10:32,670 OK, let's see. 120 00:10:34,410 --> 00:10:35,610 Click over here to build. 121 00:10:43,360 --> 00:10:48,850 It's built in to build successfully, and then I'll click to go to the burger. 122 00:10:54,430 --> 00:10:55,090 To in. 123 00:11:02,020 --> 00:11:02,800 Click to switch. 124 00:11:14,830 --> 00:11:16,330 And I'll make way. 125 00:11:19,470 --> 00:11:20,360 Eau Claire, this. 126 00:11:22,320 --> 00:11:23,790 And then a click to run. 127 00:11:26,480 --> 00:11:27,590 That's right, a strange. 128 00:11:29,300 --> 00:11:31,940 OK, let's try to find out where the issue is. 129 00:11:37,070 --> 00:11:37,400 See? 130 00:11:39,080 --> 00:11:39,580 OK. 131 00:11:41,350 --> 00:11:43,090 So we're going to exit this. 132 00:11:47,110 --> 00:11:47,740 Let's see. 133 00:11:49,290 --> 00:11:52,200 Whether we are sending and receiving the right information. 134 00:11:57,100 --> 00:12:01,300 Value to send over here, we send in this. 135 00:12:04,540 --> 00:12:05,110 And then. 136 00:12:07,970 --> 00:12:08,930 A message. 137 00:12:12,660 --> 00:12:13,630 During this year. 138 00:12:14,480 --> 00:12:17,440 And dates and then Prince dates. 139 00:12:20,010 --> 00:12:24,100 To solve this, we can simply make our buffer here global. 140 00:12:24,150 --> 00:12:25,590 I'm going to cut this. 141 00:12:25,920 --> 00:12:27,050 I received a. 142 00:12:28,020 --> 00:12:34,590 And then make Globo over here, we don't need we don't need data anymore, we simply going to print 143 00:12:34,590 --> 00:12:36,460 the contents directly. 144 00:12:37,110 --> 00:12:37,590 Right. 145 00:12:37,710 --> 00:12:39,360 So I'll see print receive. 146 00:12:40,530 --> 00:12:41,940 Message index zero. 147 00:12:42,000 --> 00:12:46,890 I'll type cause this to end, it's already on edge, isn't it? 148 00:12:47,460 --> 00:12:48,630 It's into too. 149 00:12:48,750 --> 00:12:49,740 So we don't need this. 150 00:12:50,350 --> 00:12:51,060 We don't need this. 151 00:12:51,090 --> 00:12:53,550 OK, now let's run and see. 152 00:12:53,550 --> 00:12:54,870 OK, click over here to build. 153 00:13:00,320 --> 00:13:01,010 It's Putin. 154 00:13:02,580 --> 00:13:06,420 It's built successfully and click here to run. 155 00:13:16,080 --> 00:13:16,770 Und. 156 00:13:18,070 --> 00:13:19,030 Let's wait for it. 157 00:13:19,420 --> 00:13:21,850 OK, I'm going to open my cereal port. 158 00:13:24,310 --> 00:13:32,110 And I can see receiving a message receives 20, 50, OK, so this is it, this is how to use message 159 00:13:32,110 --> 00:13:34,910 cues with our Simms's ourselves apps. 160 00:13:35,260 --> 00:13:36,190 So that's all there is. 161 00:13:36,220 --> 00:13:37,030 I'll see you later. 162 00:13:37,060 --> 00:13:37,740 Have a nice day.