1 00:00:00,750 --> 00:00:07,590 Hi and welcome to a new section in this discourse, in this section of several lectures where I'll show 2 00:00:07,590 --> 00:00:13,590 you some topics that are specifically related to working with Michael Python on the E.S.P. 3 00:00:13,590 --> 00:00:19,980 Thirty two, for example, in this first lecture of the section, I'll show you a couple of ways by 4 00:00:19,980 --> 00:00:27,720 which he can interact with the micro python show and run interactive programs or even execute programs 5 00:00:27,720 --> 00:00:31,230 that are already stored on the file system. 6 00:00:31,590 --> 00:00:38,520 Then in the next lecture, I'll show you how to upload and download files using thony from your computer's 7 00:00:38,640 --> 00:00:45,990 file system to the security file system and vice versa, and how to do things such as interrupt a running 8 00:00:45,990 --> 00:00:47,280 program and so on. 9 00:00:47,910 --> 00:00:50,330 So let's begin here with the shell. 10 00:00:50,650 --> 00:00:55,020 The shell, of course, is running on the E.S.P 32 note on Sony. 11 00:00:55,380 --> 00:00:58,350 Sony just gives us access to the shell. 12 00:00:58,530 --> 00:01:02,880 And it's just one of the various ways by which you can access said we're going to show you how to do 13 00:01:02,880 --> 00:01:04,050 that with Sony. 14 00:01:04,050 --> 00:01:06,600 And this is something that you've already seen in previous lectures. 15 00:01:06,960 --> 00:01:13,680 But I'm going to show you an alternative here where I use a program called Serial, which gives me access 16 00:01:13,680 --> 00:01:18,510 to the exact same schill running on the E.S.P 32. 17 00:01:19,110 --> 00:01:21,900 So I'm going to keep those two side by side. 18 00:01:21,900 --> 00:01:29,040 And of course, only one of the two tools can be connected to the micro python show on the E at a time. 19 00:01:29,040 --> 00:01:32,490 And right now I have connected Thorney to the show. 20 00:01:32,490 --> 00:01:39,600 You can see that micro python device is available here on the left side of the Tony Idy and of course, 21 00:01:39,600 --> 00:01:42,600 the shopfront right here waiting for my command. 22 00:01:43,560 --> 00:01:53,220 So to demonstrate a couple of things here, I have connected a rate ality to Gibril twenty one and then 23 00:01:53,220 --> 00:02:02,670 via a two hundred and twenty ohm resistor current the meeting resistor to ground the C here, the cathode 24 00:02:02,820 --> 00:02:08,370 of the LDA goes towards ground and let me just put that back in place. 25 00:02:09,360 --> 00:02:09,960 All right. 26 00:02:11,210 --> 00:02:17,990 When you work with the show exclusively and let's imagine that we are not doing this on phonier right 27 00:02:17,990 --> 00:02:24,920 now, so we don't have access to this file browser in particular here, one of the modules that you 28 00:02:24,920 --> 00:02:29,960 want to be familiar with is the OS or the operating system. 29 00:02:29,960 --> 00:02:36,220 So this module is a core module with Python or that is C Python. 30 00:02:36,680 --> 00:02:43,310 And in this case, because we are working with Micro Python, there is a micro operating system where 31 00:02:43,310 --> 00:02:51,230 you OS or micro OS services module, which contains a subset of the functions that you'll find in the 32 00:02:51,230 --> 00:02:54,330 full blown C OS module. 33 00:02:54,650 --> 00:02:59,720 The functions are listed here looking at the macro python documentation and you can see some of those, 34 00:02:59,840 --> 00:03:06,620 for example, that you named the the micro main function gives you a table that contains those items 35 00:03:06,620 --> 00:03:16,820 in it that helps you identify which device your script is working with, this random object with random 36 00:03:16,820 --> 00:03:18,250 numbers, et cetera, et cetera. 37 00:03:18,260 --> 00:03:24,590 But the one that I find interesting and we're going to use in the moment is this one here list directory. 38 00:03:24,600 --> 00:03:31,460 So I'm going to use this directory to see what files are already running on my show, and then I'll 39 00:03:31,460 --> 00:03:33,290 show you how to execute those files. 40 00:03:34,750 --> 00:03:40,310 We can create directories or remove files, et cetera, so we can have a look at this location to see 41 00:03:40,700 --> 00:03:46,520 what kind of functions are available to inside the OS services module. 42 00:03:47,120 --> 00:03:48,060 So this is very useful. 43 00:03:48,080 --> 00:03:48,980 Let's try it out. 44 00:03:49,020 --> 00:03:53,480 I'm going to import U. 45 00:03:53,660 --> 00:03:58,770 S first, and then I'm going to do a listing to see what files are available. 46 00:03:58,790 --> 00:04:03,470 Of course, we can see those files here, but I'm going to do that one on the show. 47 00:04:04,040 --> 00:04:06,230 So let's pick this command. 48 00:04:06,410 --> 00:04:13,940 It's this just copy and paste in here, open close parentheses. 49 00:04:14,180 --> 00:04:17,560 And you can see that in the root directory of these three files. 50 00:04:17,960 --> 00:04:25,940 Of course, the whole world wide contains this script and I can just type it in the shell and run it 51 00:04:25,940 --> 00:04:26,720 interactively. 52 00:04:26,730 --> 00:04:30,960 I just say hello here and it will come back. 53 00:04:31,460 --> 00:04:38,930 Now, let's say that instead of you typing the interactive comment into the show, you want to execute 54 00:04:38,930 --> 00:04:42,770 an existing file like the Arrow and the score will be Wi-Fi. 55 00:04:42,800 --> 00:04:43,100 Right. 56 00:04:43,670 --> 00:04:44,670 So how do you do that? 57 00:04:45,080 --> 00:04:53,180 There's a python command called Exec File, which I find very useful for exactly this purpose. 58 00:04:53,210 --> 00:04:56,000 So I'm going to copy the name of the file. 59 00:04:58,330 --> 00:05:06,820 And pasted in here, you can see as I clicked on this item in the array, the object inspector came 60 00:05:06,820 --> 00:05:11,560 out and he told me what the contents of this array are, just pretty interesting. 61 00:05:11,560 --> 00:05:16,430 And you get such beautiful partnership data and we close it for now. 62 00:05:16,840 --> 00:05:24,520 So I have used a file past the argument, which is the name of the file and enter, and that would just 63 00:05:24,520 --> 00:05:30,880 execute the program that is contained inside this file here. 64 00:05:31,570 --> 00:05:37,090 So let's go over to the alternative, which is just another way of connecting to the exact same shell 65 00:05:37,090 --> 00:05:39,100 in achieving the exact same thing. 66 00:05:39,580 --> 00:05:42,490 So the first thing to do here is to disconnect. 67 00:05:43,600 --> 00:05:48,970 And release my especially two and then I'm going to connect. 68 00:05:50,240 --> 00:05:57,950 Heat control command to deal on my computer, but you can also do the terminal connect and that will 69 00:05:57,950 --> 00:06:02,630 connect you to the shell hit enter to get the prompt and the prompt. 70 00:06:03,020 --> 00:06:05,500 And I can do the exact same thing as I did in Sony. 71 00:06:05,510 --> 00:06:17,000 So import your as so micro OS and then try out the directory Alistaire function where it is code completion 72 00:06:17,000 --> 00:06:23,860 as well as I can hit tab and I'll get a code completion feature activated. 73 00:06:24,530 --> 00:06:28,360 So these are the three of the two files plus the directory. 74 00:06:28,370 --> 00:06:36,680 At this level there is no differentiation between a file in the directory and I'll use exec file to 75 00:06:36,680 --> 00:06:37,520 execute. 76 00:06:38,270 --> 00:06:43,190 Hello World P y and it works. 77 00:06:43,310 --> 00:06:44,110 No problem at all. 78 00:06:45,430 --> 00:06:54,430 So I'm going to disconnect from Serial and continue with a couple of other experiments in the. 79 00:06:56,530 --> 00:06:58,440 She provided by Sony. 80 00:06:59,500 --> 00:07:06,520 So let's click on Stop to actually start and the connections a bit counter, but still potentially to 81 00:07:06,520 --> 00:07:09,800 stop and restart the back end so easily. 82 00:07:10,150 --> 00:07:11,440 Three, two is connected again. 83 00:07:11,440 --> 00:07:12,430 You can see it here. 84 00:07:12,890 --> 00:07:14,190 It is good to go. 85 00:07:15,910 --> 00:07:22,510 This is a look at another example here that involves the ability to now copy some code from the Python 86 00:07:22,510 --> 00:07:26,350 file here on my local file system onto the shelf. 87 00:07:27,010 --> 00:07:34,360 So first of all, there is the machine module, which contains various modules, including Pend, that 88 00:07:34,360 --> 00:07:36,580 allows me to work with pins. 89 00:07:36,580 --> 00:07:42,910 And I've got a lot more information about this in Sections seven and on which where I'm going to go 90 00:07:42,910 --> 00:07:44,460 deep into those modules. 91 00:07:44,460 --> 00:07:46,060 So for now, don't worry too much about them. 92 00:07:46,060 --> 00:07:51,120 Just play along and see how this works then. 93 00:07:51,460 --> 00:07:55,230 Actually, I'm not going to import any time or micro time. 94 00:07:55,240 --> 00:07:56,810 I'm not going to worry about that for now. 95 00:07:57,130 --> 00:07:59,740 Next thing to do is to create the ality object. 96 00:08:01,990 --> 00:08:10,360 Connect the object to PIN twenty one and configure it as an output, then I'm going to use Alyda on. 97 00:08:13,270 --> 00:08:25,690 To turn on the radio and really off to turn it off, very simple, so you can now control hardware resources 98 00:08:25,690 --> 00:08:30,640 from the shell, but the show also allows you to create blocks of code. 99 00:08:30,650 --> 00:08:34,030 So, for example, here there's a block of code, there's an infinite loop. 100 00:08:34,630 --> 00:08:41,200 This is going to execute forever because the condition here is true. 101 00:08:41,210 --> 00:08:42,010 It doesn't change. 102 00:08:42,370 --> 00:08:48,040 So it's going to turn on the ality, hold it on for half a second and then turn it off and leave it 103 00:08:48,040 --> 00:08:49,230 off for another second. 104 00:08:49,630 --> 00:08:54,520 And this will give you the opportunity to show you how to work with loops on the comment on the shell 105 00:08:54,670 --> 00:08:56,370 and also how to interrupt them. 106 00:08:57,100 --> 00:09:06,250 So because we're using the Sleeth function here, I need to import sleep from the MICRA time module. 107 00:09:06,370 --> 00:09:09,220 So there's sleep and I'm just going to take this. 108 00:09:09,430 --> 00:09:18,070 So while true, don't forget the the two dots, in the end I can see that the shell is waiting for me 109 00:09:18,400 --> 00:09:22,990 with indentation type something in that is going to be part of this wire block. 110 00:09:23,590 --> 00:09:26,800 So Nelida on. 111 00:09:28,010 --> 00:09:40,240 Then sleep or have a second and then the early days of and sleep for another half a second. 112 00:09:40,850 --> 00:09:41,740 So now I'm done. 113 00:09:42,130 --> 00:09:45,900 I've got to go back up and put the parentheses there. 114 00:09:46,300 --> 00:09:48,880 So there is some intelligence in the show. 115 00:09:48,880 --> 00:09:50,710 So you see that the show didn't panic. 116 00:09:51,070 --> 00:09:58,360 I was just able to use the Iraqis to go back up one line and add the missing parentheses. 117 00:09:58,360 --> 00:10:03,670 And they showed that show, knew there was something wrong there because they did had the Korei highlight 118 00:10:03,670 --> 00:10:04,300 like that. 119 00:10:04,930 --> 00:10:10,290 So you know that you need to close the parentheses to match the opening parentheses. 120 00:10:11,170 --> 00:10:15,670 So done with that line and I'm actually done with the blog. 121 00:10:15,670 --> 00:10:17,350 So I'm going to hit Enter one more time. 122 00:10:17,650 --> 00:10:26,020 And now the entity is blinking on of half a second each time and you can see them not having the prompter 123 00:10:26,020 --> 00:10:26,670 down here. 124 00:10:26,680 --> 00:10:33,370 I don't see the prompter because my micro python instance is busy blinking this time. 125 00:10:33,940 --> 00:10:38,350 So my DP 32 can't really do anything else right now. 126 00:10:38,440 --> 00:10:45,700 It's locked up in this infinite loop to stop the infinite loop and to be able to do something else like 127 00:10:45,700 --> 00:10:47,020 upload or download a file. 128 00:10:47,410 --> 00:10:56,440 I need to either go in to run and say interrupt execution or just hit control, see, which is what 129 00:10:56,440 --> 00:10:56,860 I'll do. 130 00:10:58,000 --> 00:11:03,760 And that we interrupt the execution and break out of the loop forcefully, but it does break out of 131 00:11:03,760 --> 00:11:07,040 the loop, the memory is not quite it's still there. 132 00:11:07,060 --> 00:11:12,370 So I can still go back or turn on or off senility. 133 00:11:12,940 --> 00:11:14,890 So the objects are still in memory. 134 00:11:16,410 --> 00:11:17,070 And. 135 00:11:20,030 --> 00:11:26,330 And she can see I am able to use the shield to write simple programs, test concepts out, and then 136 00:11:26,330 --> 00:11:34,160 go in to my script and work on larger programs as part of a file one or more files. 137 00:11:34,850 --> 00:11:39,380 So this was a demonstration of the things that you can do with the show, regardless of how you are 138 00:11:39,380 --> 00:11:44,540 connected to the show, either using phony or some other tool. 139 00:11:44,900 --> 00:11:51,440 In the next lecture, I'll show you how to do file management operations using phony phony. 140 00:11:51,450 --> 00:11:58,940 It's a very convenient file manager, these two windows here which allow you to send files back and 141 00:11:58,940 --> 00:12:04,380 forth between your host computer and the spirit listening post.