1 00:00:00,900 --> 00:00:01,980 Hello, welcome back. 2 00:00:02,190 --> 00:00:04,230 In this lesson, we should talk about soft. 3 00:00:04,290 --> 00:00:05,040 What time is? 4 00:00:06,500 --> 00:00:14,450 Software timers are used to schedule the execution of a function at a set time in the future or periodically 5 00:00:14,450 --> 00:00:22,230 with a fixed frequency, the function executed by the software timer is called the software time as 6 00:00:22,230 --> 00:00:23,240 a callback function. 7 00:00:24,160 --> 00:00:29,350 This time is different from our hardware, time is such as time. 8 00:00:29,420 --> 00:00:30,910 One, two, three, etc.. 9 00:00:31,210 --> 00:00:35,620 These timers are implemented under the control of the artist Toscano. 10 00:00:35,800 --> 00:00:41,290 They do not require hardware support and are not related to the hardware timers. 11 00:00:41,980 --> 00:00:49,570 So to use this time as we have to go to our free Archos config that each file and sets config use underscore 12 00:00:49,570 --> 00:00:53,950 time is to one before we are able to use this time in our project. 13 00:00:55,330 --> 00:01:02,290 So there are two types, the risk, the auto reload time out and the one short timer, the auto reload 14 00:01:02,290 --> 00:01:07,150 time out once we started it would restart itself after it expires. 15 00:01:07,450 --> 00:01:11,320 And this result in a periodic execution of its callback function. 16 00:01:11,890 --> 00:01:19,210 And the one shot timer when we restarted and it's execute its callback function was in its expires. 17 00:01:19,460 --> 00:01:21,310 It doesn't restart itself. 18 00:01:21,850 --> 00:01:23,940 We have to manually restarted. 19 00:01:23,980 --> 00:01:26,080 That is why it is called one short. 20 00:01:27,720 --> 00:01:33,930 The key parameter when talking about these times is the period, the period is the time between the 21 00:01:33,930 --> 00:01:39,390 software time are being started and the software time as a callback function executing. 22 00:01:39,690 --> 00:01:46,650 So this time period is quite a period of time between starting the timer and executing the time as a 23 00:01:46,650 --> 00:01:47,530 callback function. 24 00:01:47,850 --> 00:01:50,910 It's known as the period the timer has to state. 25 00:01:50,910 --> 00:01:55,100 It has the dormant state and the running states in the dormant state. 26 00:01:55,110 --> 00:01:58,830 The callback function does not execute in the running states. 27 00:01:59,520 --> 00:02:01,740 The callback function is being executed. 28 00:02:02,220 --> 00:02:04,260 So we can look at the state diagram. 29 00:02:05,130 --> 00:02:11,300 This state diagram here represented to the state of the auto reload timer. 30 00:02:11,580 --> 00:02:16,680 So when the time is created, as you can see in this diagram, it's in the Dormont State. 31 00:02:16,950 --> 00:02:23,340 We can call the time I start the next time I restart or the next time I change period to move. 32 00:02:23,340 --> 00:02:26,400 The time when we call any of these functions. 33 00:02:26,640 --> 00:02:32,880 The timer moves from the dormant state to the run in the state, in the auto reload case when the timer 34 00:02:32,880 --> 00:02:39,220 expires in the running state, still remains in the running state to reload itself. 35 00:02:39,870 --> 00:02:46,110 However, when we call the next time I stop, that is when the timer moves from the running state back 36 00:02:46,110 --> 00:02:47,160 to the dormant state. 37 00:02:48,680 --> 00:02:54,530 This is the version for the wine short timer who created the timer, the timer starts in the domain 38 00:02:54,550 --> 00:02:55,030 state. 39 00:02:55,070 --> 00:02:59,350 We can move the timer from Dorman's to running by calling either Eckstut. 40 00:02:59,630 --> 00:03:04,220 Next time I start, next time I restart or reset, it should be. 41 00:03:04,430 --> 00:03:08,590 And then when we also change the timer period, it moves to the running stage. 42 00:03:08,890 --> 00:03:14,330 However, over here there are two things that move the timer from the running state to the Domar state. 43 00:03:14,630 --> 00:03:18,340 When the timer expires, it automatically moves the dormant state. 44 00:03:18,350 --> 00:03:19,000 That is one. 45 00:03:19,190 --> 00:03:25,190 The second thing is when we call the time a stop function, the timer would move to the dormant state. 46 00:03:26,960 --> 00:03:31,640 So let's see some commonly used APIs when we're dealing with a wire timer. 47 00:03:32,750 --> 00:03:38,450 OK, so we have the X time to create this function is used to create a timer. 48 00:03:38,480 --> 00:03:40,640 It takes five arguments. 49 00:03:40,640 --> 00:03:41,750 As you can see over here. 50 00:03:41,750 --> 00:03:45,710 The first argument is just a readable name that we can give the timer. 51 00:03:45,890 --> 00:03:49,310 And a second argument is the the period. 52 00:03:50,060 --> 00:03:54,860 And then the third argument allows us to indicate whether we want to set or reload. 53 00:03:54,860 --> 00:03:59,270 True or false, if we said is to force, it will become a Y short time. 54 00:03:59,270 --> 00:04:06,470 If we said is to true, then it becomes an auto reload timer and then over here we give it a timer on 55 00:04:06,470 --> 00:04:09,980 it and then the callback function that the time I should execute. 56 00:04:10,490 --> 00:04:11,600 So these are the argument. 57 00:04:11,630 --> 00:04:13,070 We'll see how it is done in code. 58 00:04:14,560 --> 00:04:19,850 And also, there is the next time I start to function, this function is used to start the timer. 59 00:04:20,170 --> 00:04:27,610 It just takes the time of Handler's argument and then we can give a wait time, how much time we should 60 00:04:27,610 --> 00:04:30,760 wait for this function to execute X to wait. 61 00:04:31,030 --> 00:04:36,660 OK, and then we have the the functions for dealing with the time. 62 00:04:37,150 --> 00:04:43,390 We can set the idea and we can read the idea and we'll see the use of it when we could in the timer. 63 00:04:44,350 --> 00:04:52,210 Right, so they saw the race for timers, so let's go ahead and write some practical code using our 64 00:04:52,210 --> 00:04:54,280 software, telling us I'll see you the next lesson.