WEBVTT 00:00.180 --> 00:07.810 Let's write some values inside the memory and then let's retrieve them after we restart the program. 00:08.040 --> 00:13.890 So first of all, if you want to be able to use EPROM functionality in your code, you have to include 00:14.010 --> 00:15.740 the library. 00:16.350 --> 00:18.450 We include like this. 00:19.260 --> 00:25.190 Again, this is the first library that we import and actually the library is already installed. 00:25.200 --> 00:33.100 So you just need to do include and then break it up from that H so EPROM all uppercase. 00:33.660 --> 00:35.310 That age lowercase. 00:36.390 --> 00:39.870 And this way, you can use it in your program. 00:40.740 --> 00:41.850 Let's remove this. 00:44.850 --> 00:47.280 So here, I'm going to write stuff in the. 00:47.700 --> 00:52.730 OK, don't write in the loop funnel if you want to follow what I'm doing right in the city. 00:52.900 --> 00:53.910 That's very important. 00:54.600 --> 00:57.580 One thing to do is simply do it from DOT. 00:58.050 --> 00:58.640 Right. 00:59.400 --> 01:02.100 OK, you can see it then arrange to. 01:03.150 --> 01:10.950 So from that right, you can simply write a volume inside it from memory, so you have to give two arguments 01:10.950 --> 01:11.150 here. 01:11.370 --> 01:13.740 The first one is the other. 01:14.380 --> 01:20.090 So the other race goes from zero to one thousand twenty three. 01:20.220 --> 01:23.270 OK, you have one thousand twenty four values. 01:23.760 --> 01:27.620 So of course, in programming we start to count at zero. 01:27.630 --> 01:30.370 So the maximum is one thousand twenty three. 01:31.020 --> 01:36.800 So I'm just going to use the algorithm zero and then I can write a bite. 01:37.020 --> 01:40.870 So any value between zero and two hundred fifty five. 01:41.310 --> 01:43.740 So let's say I write forty four. 01:44.820 --> 01:48.240 All right, let's use another EPROM. 01:49.200 --> 01:49.480 Right. 01:49.500 --> 01:54.860 So if you want to write on two addresses like this, you can just write EPROM, right twice. 01:55.560 --> 01:57.360 Let's say what to write on the other. 01:57.600 --> 02:01.890 Two hundred and I want to write one hundred fifty. 02:02.640 --> 02:10.410 So with this good, I'm going to write Disvalue 44 inside the other a zero and Disvalue 150. 02:10.410 --> 02:11.830 Inside the address 200. 02:12.810 --> 02:16.230 And let's actually run that code like this so. 02:17.260 --> 02:19.480 To a prom, right, only in the. 02:20.020 --> 02:25.480 Don't write them in the loop, because if you put that in the loop, it is going to go very, very, 02:25.480 --> 02:26.170 very fast. 02:26.620 --> 02:33.520 And then you are going to write on the address is very fast and reach the one hundred thousand right 02:33.520 --> 02:38.360 cycle and then the other is zero and the address 200 will be gone. 02:38.530 --> 02:43.050 You still have the other ones, but then you are just destroying two addresses here. 02:43.060 --> 02:44.250 We just write ones. 02:44.260 --> 02:45.710 So that's completely fine. 02:46.600 --> 02:48.000 So two bodies. 02:48.010 --> 02:49.450 OK, upload. 02:51.100 --> 02:51.780 EPROM. 02:54.810 --> 02:58.960 OK, Don, applauding so well here you don't have any output. 02:59.040 --> 03:03.530 OK, you don't have anything on sale, you don't have any LCD blinking or whatever. 03:03.930 --> 03:05.280 You don't have anything. 03:05.370 --> 03:07.950 You just have written values in the paper. 03:08.220 --> 03:10.110 OK, what I'm going to do. 03:10.140 --> 03:11.790 I'm going to comment this. 03:13.190 --> 03:17.270 So this will not be executed and I'm going to do so. 03:19.250 --> 03:20.360 Footprint print, Ellen. 03:21.360 --> 03:25.120 EPROM reboot with zero. 03:26.130 --> 03:31.820 So if you want to write a value, you just do it right with the address and the value. 03:32.100 --> 03:34.530 If you want to read a value, it's very simple. 03:34.540 --> 03:40.740 You do it from the tree and then the other is OK and you will get the value that was stored in that. 03:40.750 --> 03:44.640 Otherwise, of course, you sell print and insole. 03:45.900 --> 03:47.280 So they'll begin. 03:50.650 --> 03:52.420 And I'm going to do this. 03:54.780 --> 03:56.680 One or two more times. 03:56.700 --> 03:58.960 OK, I'm going to read from the other. 03:59.430 --> 04:00.570 Let's see. 04:01.090 --> 04:04.550 Eighty nine and the address, two hundred. 04:05.130 --> 04:06.760 And let's see what it does. 04:06.810 --> 04:13.320 So, of course I have this is important commented are removed those two lines and also upload code. 04:15.540 --> 04:18.780 Don't applauding and to say on Moniteau. 04:21.680 --> 04:24.370 And you can see so what do we have here? 04:24.710 --> 04:33.060 Quite interesting, we have 44 which correspond to the address zero and then we have 255 for the address. 04:33.080 --> 04:36.350 Eighty nine and one hundred fifty for the address. 04:36.560 --> 04:45.380 Two hundred he and this program, we don't write to the market, so value 44 that we read from the address. 04:45.410 --> 04:48.340 Zero is here because it was told in April. 04:48.560 --> 04:53.030 OK, I have restarted the program but the value is still here. 04:53.570 --> 05:00.410 OK, so all the variables in the program are gone, but what you have saved in the memory stays there. 05:01.000 --> 05:03.630 We have added value 44 and the other is zero. 05:04.070 --> 05:08.350 We also retrieve the value one hundred fifty and the other is two hundred. 05:08.450 --> 05:11.350 So that's the exact values we have written previously. 05:12.050 --> 05:13.940 And then you can see I just. 05:13.940 --> 05:15.970 But any random address. 05:15.980 --> 05:18.000 Eighty nine and we have the value. 05:18.020 --> 05:19.370 Two hundred fifty five. 05:19.850 --> 05:26.350 So basically if you have not written anything you will get 255 or so, maybe zero. 05:26.540 --> 05:32.390 Depends on if you have read it by yourself, do it from memory with zero before you can see we have 05:32.390 --> 05:33.050 this value. 05:33.050 --> 05:40.010 If you have not written to me from before so great, you have saved your first values inside the memory 05:40.250 --> 05:47.810 and you were able to reach them in another run of the program with a different program actually using 05:47.810 --> 05:51.050 so EPROM write to write and to read. 05:51.170 --> 05:57.620 And now once again, make sure you don't do it from the right in the void loop like this directly in 05:57.620 --> 05:59.930 an infinite loop that goes very fast. 06:00.620 --> 06:04.110 But it doesn't mean that you can't use it from right in the loop. 06:04.250 --> 06:06.810 Only use it with a condition. 06:06.840 --> 06:12.080 OK, we've if condition with something that only happens not frequently. 06:12.080 --> 06:18.860 For example, when you get data from the sale communication or if you want to price the pushbutton, 06:19.980 --> 06:20.840 stuff like this. 06:21.260 --> 06:24.950 So you make sure that you don't write in from memory to often. 06:26.740 --> 06:28.880 All right, and that's pretty much it for the economy. 06:29.070 --> 06:31.840 So, as you can see, that is quite simple to use.