1 00:00:04,050 --> 00:00:04,560 Hello. 2 00:00:04,620 --> 00:00:10,620 Welcome to the timeless section in this section we shall learn how to create time up for more applications 3 00:00:10,620 --> 00:00:12,370 using the Cuban mix. 4 00:00:12,390 --> 00:00:19,840 So let's start by creating a delay with time to create a project that uses time to create delays. 5 00:00:20,030 --> 00:00:24,960 And that's the most basic application of time is to create accurate delays. 6 00:00:25,000 --> 00:00:30,000 So let's see how we're going to go about that using a Cuban mix click over here to create a new project 7 00:00:31,790 --> 00:00:33,670 and select my board. 8 00:00:33,680 --> 00:00:36,870 My board is DST and threats to this country report. 9 00:00:37,040 --> 00:00:45,340 An F for board and this my particular microcontroller DoubleClick and then it opens and well what I 10 00:00:45,340 --> 00:00:50,800 want to do is first and foremost clear pin out and then I'll click yes over here. 11 00:00:50,980 --> 00:00:57,730 What I want to do is select a time a module in set time a module to provide a delay for us let's use 12 00:00:57,760 --> 00:01:04,240 timeout to him going to click time to show once we select our time I we have to enable a clock source 13 00:01:04,240 --> 00:01:09,760 that a timer and I want to use internal clocks also just come over here disrupt our menu select the 14 00:01:09,780 --> 00:01:16,090 internal clock to run the experiment How about we enable the orange entity to demonstrate this. 15 00:01:16,300 --> 00:01:22,800 So I'm just going to enable PD 30 and the GPI output so this all there is to it. 16 00:01:22,900 --> 00:01:29,980 Now we can come to configuration tab to configure our timer so click over here and we need to set a 17 00:01:29,980 --> 00:01:34,300 pre-schooler for a timer in the counter mode as well as the counter period. 18 00:01:34,360 --> 00:01:38,660 So we're going to put a pre-schooler here based on the time of clock frequency. 19 00:01:38,740 --> 00:01:43,330 Let's see the clock frequency of the timer by going to the clock configuration to see the clock. 20 00:01:43,330 --> 00:01:50,140 Treat this the clock tree from the tree we can see our timer so all time a frequency is forty eight 21 00:01:50,380 --> 00:01:53,890 megahertz meaning forty eight clock cycles per second. 22 00:01:54,280 --> 00:02:00,520 So what we want to do is we want to bring our time into the millisecond unit since forty eight million 23 00:02:00,520 --> 00:02:02,560 clock cycles give us one second. 24 00:02:02,560 --> 00:02:08,290 Then we know that forty eight thousand cycles gives us one millisecond. 25 00:02:08,290 --> 00:02:14,590 So when we use this preschooler we've brought our time eye unit into millisecond unit and what we want 26 00:02:14,590 --> 00:02:20,950 is to give the the count up period and we want to set it count accurate to be one second a second at 27 00:02:20,950 --> 00:02:21,650 a time. 28 00:02:21,970 --> 00:02:24,290 And that is 1000. 29 00:02:24,370 --> 00:02:30,520 So yeah this all we need and we have to keep this one here update event time trigger selection. 30 00:02:30,520 --> 00:02:36,380 We have to select update event to keep it updating and going on and on right. 31 00:02:36,430 --> 00:02:37,570 Moving on. 32 00:02:37,570 --> 00:02:42,600 So once we've done this we have to enable the timer to interrupt so I'll just take it over here then 33 00:02:42,610 --> 00:02:44,410 I click Okay. 34 00:02:44,560 --> 00:02:47,480 Now we can generate our code a click over here. 35 00:02:47,500 --> 00:02:54,160 If my project her name and this project I'm going to call it delete M.S. meaning delay me delay s actually 36 00:02:54,520 --> 00:02:59,200 because we delay and in seconds and I'm going to choose my tool chain. 37 00:02:59,230 --> 00:03:06,730 I'm using the call and decay version 5 will select this click OK and it begins that generation process 38 00:03:07,180 --> 00:03:13,500 and then once that is done I can click overhead to open my project and it takes a while to open. 39 00:03:13,600 --> 00:03:14,680 And here we are. 40 00:03:14,850 --> 00:03:19,330 I'll just rebuild to unify Everything Click Here. 41 00:03:19,420 --> 00:03:26,970 Then it rebuilds and before I move on I'll just update my debugger here to reset and run. 42 00:03:27,440 --> 00:03:32,080 Press the reset button when I load new code and then I'll click Okay. 43 00:03:32,980 --> 00:03:39,970 It's open here and what we need to basically do is start our timer and we can just come here and see 44 00:03:40,480 --> 00:03:53,370 call it go on this quarter I am on the score and the score starts on that score 80. 45 00:03:53,500 --> 00:03:59,820 This function takes the timer instance assets arguments and it's all time milestones as defining this 46 00:03:59,830 --> 00:04:05,450 the time a handler sorry as its arguments and a time a handler just defined here. 47 00:04:05,710 --> 00:04:11,240 So we just need to point to the time a handler put this pulley on the Sunshine here like this. 48 00:04:11,330 --> 00:04:15,650 Then we've started our time with basically no he's fine. 49 00:04:15,690 --> 00:04:19,780 So now our time has started and it's going to reload every second. 50 00:04:19,980 --> 00:04:27,120 Now what we want to do is we want to implement the callback function that should run whenever this time 51 00:04:27,150 --> 00:04:28,370 comes to 1. 52 00:04:28,380 --> 00:04:30,430 One second just like we set it. 53 00:04:30,450 --> 00:04:33,000 We said that time to reload every second. 54 00:04:33,000 --> 00:04:38,280 Now we have to implement the callback function and a callback function is going to contain the code 55 00:04:38,330 --> 00:04:40,170 that will run every second. 56 00:04:40,170 --> 00:04:42,360 So that's our delay is going to occur. 57 00:04:42,420 --> 00:04:46,290 We're going to put the LCD toggle in that function. 58 00:04:46,620 --> 00:04:49,620 So then we create a delay like the show. 59 00:04:49,770 --> 00:04:58,640 Let's move on and the API we need in order to perform this is known as the period elapsed API to quickly 60 00:04:58,640 --> 00:04:59,090 find it. 61 00:04:59,090 --> 00:05:03,350 We can come over here and we can jump straight to where we can find it. 62 00:05:03,380 --> 00:05:11,060 So click the timeout model here and our search for how time a period and lots and I'll just open this 63 00:05:11,060 --> 00:05:16,040 up a bit this one this one we're looking for. 64 00:05:16,070 --> 00:05:17,090 So we just copy this. 65 00:05:17,090 --> 00:05:22,090 This is our time a callback function period. 66 00:05:22,090 --> 00:05:27,660 The last callback a copy of this and then I implemented with the weak keyword. 67 00:05:28,010 --> 00:05:31,830 So I just put this here like this and I can clean this. 68 00:05:32,090 --> 00:05:34,580 And in fact I can take all of this. 69 00:05:34,720 --> 00:05:38,090 And in this one here now I can talk it my elegy. 70 00:05:38,090 --> 00:05:47,420 I can see how on a school G.P. I go on a school talking little pain and then what's the pain I want 71 00:05:47,420 --> 00:05:48,200 to talk to. 72 00:05:48,230 --> 00:05:52,900 This one takes first before the court and then the pain as GPI. 73 00:05:53,420 --> 00:05:59,980 On the school pain on the school 13 4 0 0 0 range LTE. 74 00:06:00,040 --> 00:06:00,800 So I've reviewed 75 00:06:04,000 --> 00:06:12,060 and then download onto my board and as you can see the orange reality is totally. 76 00:06:12,200 --> 00:06:19,490 So this how to create simple delays using a timer in the next lesson we show you should take a look 77 00:06:19,490 --> 00:06:23,480 at more applications of the timer and then I'll see you in the next lesson yet.