1 00:00:03,530 --> 00:00:04,040 Hello. 2 00:00:04,100 --> 00:00:04,790 Welcome back. 3 00:00:04,790 --> 00:00:12,560 So in this lesson we're going to create an ADC continuous conversion project to ADC continuous conversion 4 00:00:12,980 --> 00:00:20,180 is actually used for much more rapid ADC conversion to a single mode converts in a very slow manner. 5 00:00:20,210 --> 00:00:25,580 But if you want the conversion to be happening very rapidly let's say you're doing some form of signal 6 00:00:25,580 --> 00:00:29,880 processing that requires your conversion to be going into microseconds. 7 00:00:30,410 --> 00:00:36,440 Then it's better to use the ADC continuous conversion mode and if you need more information about continuous 8 00:00:36,440 --> 00:00:38,120 conversion you can send the message. 9 00:00:38,330 --> 00:00:44,610 So let's go to Cuba mix come over here and this where we left off with the other project. 10 00:00:44,610 --> 00:00:50,340 I just click here to greet a new project and I'm going to select my board. 11 00:00:50,340 --> 00:00:52,270 It's the SDM that's to a full board 12 00:00:55,090 --> 00:00:56,630 Discovery. 13 00:00:56,780 --> 00:01:02,860 Assume that two for this one here's my board and I'm still going to use my p zero which is connected 14 00:01:02,890 --> 00:01:11,080 to a DC 1 0 0 0 0 pins and ADC 1 Over here enable the 0. 15 00:01:11,140 --> 00:01:18,460 Once that is done I'll just come to the configurations and configure the ADC and this time we're going 16 00:01:18,460 --> 00:01:23,910 to mess up with it a bit more first of all we need to scale down the clock. 17 00:01:23,980 --> 00:01:27,720 We have to set a clock free clock pre-schooler here before we do that. 18 00:01:27,730 --> 00:01:31,780 Let's verify the clock of the ATC from my User Guide. 19 00:01:31,780 --> 00:01:40,720 I know my ADC is connected to APB 2 so if I come here this the clock of a people to the clock of APB 20 00:01:40,720 --> 00:01:42,910 2 is forty eight megahertz. 21 00:01:42,910 --> 00:01:50,920 So this is actually the clock off my ADC because my ADC is connected to the APB to bus so I could either 22 00:01:50,950 --> 00:01:59,170 keep that ATC clock or I could choose a preschooler in a pre-schooler basically a divider perhaps the 23 00:01:59,170 --> 00:02:04,030 clock is too fast for my application perhaps a want day clock to run. 24 00:02:04,030 --> 00:02:07,030 Perhaps I wanted to run out less a twenty four megahertz. 25 00:02:07,060 --> 00:02:12,760 If that's the case I'll choose a pre-schooler of two but I don't want to. 26 00:02:12,950 --> 00:02:15,550 I think twenty four megahertz is fine. 27 00:02:15,560 --> 00:02:20,820 So I'm not just going to change this I'll leave the default setting which is a pre-schooler of two and 28 00:02:20,830 --> 00:02:28,440 what we want is we want to enable continuous conversion over here so our community enable and data alignment. 29 00:02:28,450 --> 00:02:34,720 We shall leave it right aligned a number of channels we have just one channel and if we want to customize 30 00:02:34,720 --> 00:02:35,860 it any further. 31 00:02:35,860 --> 00:02:41,590 In fact you can come over here we can expand the rank and choose to something time. 32 00:02:41,620 --> 00:02:47,170 This one says the something time is three cycles but according to the data sheet there is a constant 33 00:02:47,200 --> 00:02:50,180 twelve cycles that each ADC conversion takes. 34 00:02:50,230 --> 00:02:55,120 So the value you see here is this value plus twelve cycles. 35 00:02:55,120 --> 00:02:59,440 So our ADC is going to take 15 psychos to sample. 36 00:02:59,500 --> 00:03:02,740 You can verify this from the data sheet of the MCU. 37 00:03:02,740 --> 00:03:06,800 If you meet any difficulties in verifying that you can send me a message. 38 00:03:07,240 --> 00:03:08,080 So this is it. 39 00:03:08,680 --> 00:03:10,390 And it's as simple as this. 40 00:03:10,390 --> 00:03:12,150 We just go and generally tell. 41 00:03:12,160 --> 00:03:17,240 No I'm just going to click Okay over here and then come to code generation. 42 00:03:17,270 --> 00:03:22,520 I'll expand this and then give my project a name I'll call it ADC continuous 43 00:03:25,100 --> 00:03:29,250 and then I'll select my two chain which they call him to give version 5. 44 00:03:29,390 --> 00:03:33,290 Then I'll click Okay over here and then it generates the code for me. 45 00:03:33,590 --> 00:03:36,370 Once that is done I just click here to open my project. 46 00:03:41,950 --> 00:03:44,070 And the project is opened. 47 00:03:44,070 --> 00:03:45,130 Click it to rebuild it. 48 00:03:45,180 --> 00:03:45,480 Oh 49 00:03:49,380 --> 00:03:56,810 and it's finished rebuild and 0 0 warning so I just come over here and then send my debugger to run 50 00:03:56,840 --> 00:03:58,870 and reset like this. 51 00:03:59,110 --> 00:03:59,750 Okay. 52 00:03:59,830 --> 00:04:06,920 And then okay now all we have to do is start the ATC like we did before and then after that we use the 53 00:04:07,010 --> 00:04:12,770 get value to storage in the particular new instead of to a variable like we did. 54 00:04:12,770 --> 00:04:14,980 So let's do that now show. 55 00:04:15,170 --> 00:04:20,870 So this time rather than keeping it all in the one one loop we just want to start the ATC outside while 56 00:04:20,900 --> 00:04:27,530 one loop and then just receive the converted value in the infinite while one loop is different from 57 00:04:27,530 --> 00:04:34,100 what we did before what we did before we kept start and get to value both in the while one loop because 58 00:04:34,100 --> 00:04:40,520 now a single conversion mode for continuous conversion mode is going to automatically convert rapidly 59 00:04:40,550 --> 00:04:43,470 without we and every now and then. 60 00:04:43,880 --> 00:04:52,070 So I'll just I'll just come here and use the same API we used ATC on the score ATC school starts 61 00:04:55,130 --> 00:04:59,450 and we know it takes it takes one argument 62 00:05:03,830 --> 00:05:10,680 the handle of the ADC then like we did before we're going to create a global grade book with 32 on the 63 00:05:10,690 --> 00:05:17,510 school team sense of value and sense of value is going to hold it's going to get conversion I'm going 64 00:05:17,510 --> 00:05:29,300 to come over NC so so funny because on a school ADC pone for conversion and then this one also takes 65 00:05:29,300 --> 00:05:35,480 the ADC on classic argument and then the the time and then I'll just for one millisecond here and then 66 00:05:35,630 --> 00:05:37,130 it should be fine. 67 00:05:37,130 --> 00:05:47,710 I reviewed all and download onto my board and once that is done I can get before I just go to the debugger 68 00:05:48,130 --> 00:05:50,020 and I'll add this to watch when the 1 69 00:05:53,420 --> 00:05:56,170 and then I'll just disable hexadecimal display. 70 00:05:56,270 --> 00:06:02,680 Now click here to learn the code and it's running and I'm moving my potential me to know yes the value 71 00:06:02,680 --> 00:06:07,540 is stopped because we're using the wrong API here called ADC gets value only. 72 00:06:07,750 --> 00:06:10,270 So I'll just change this to get value. 73 00:06:10,530 --> 00:06:18,910 Of funny and I'll disable my debugger cause I'm still doing this in a debugger. 74 00:06:18,910 --> 00:06:33,690 Come here now revealed 0 0 exited Tonga on a dude says I've got one area called ADC on a school rugby 75 00:06:35,220 --> 00:06:39,150 and it doesn't take a timeout because it's continuous conversion. 76 00:06:39,160 --> 00:06:45,060 You don't need to put timeouts there so we can verify this API by double clicking and come in here and 77 00:06:45,100 --> 00:06:47,210 as you can see gets the converted file. 78 00:06:47,250 --> 00:06:56,250 It takes just the adc can ADC Honduras argument so I'll rebuild this time it should be fine then I'll 79 00:06:56,250 --> 00:06:57,330 download onto my board 80 00:07:02,390 --> 00:07:05,330 once that is done I'll click over here to return to the De Backer 81 00:07:10,440 --> 00:07:15,750 and then I'll click here to run my code and I'm moving my potential meta now. 82 00:07:17,280 --> 00:07:19,180 And it's not change in values. 83 00:07:19,480 --> 00:07:26,190 So the reason why it's stuck is because the conversion cycles we said was too little for the ADC. 84 00:07:26,380 --> 00:07:29,410 In fact we demanded it to work too rapidly. 85 00:07:29,410 --> 00:07:32,570 Let's go back to Cuba makes me show you what I mean. 86 00:07:32,570 --> 00:07:37,170 Well I here we said something time should be three cycles. 87 00:07:37,300 --> 00:07:39,670 So this is too too little. 88 00:07:39,670 --> 00:07:46,420 The number of cycles for the ADC and we can change this to for eighty cycles and give him more time 89 00:07:46,420 --> 00:07:48,830 to convert or we can change it from the code. 90 00:07:48,940 --> 00:07:52,350 This time I'm going to show you how to change it from the code. 91 00:07:52,450 --> 00:07:57,850 Sometimes when you do your Cuban make sets in and you want to quickly change something all of it is 92 00:07:57,850 --> 00:07:58,920 generated in code. 93 00:07:58,930 --> 00:08:04,630 So if you know that a particular parameter structure you know exactly what to change one way would be 94 00:08:04,630 --> 00:08:09,260 to change it and Cuba makes and regenerates that code and then it would take effect here. 95 00:08:09,340 --> 00:08:11,860 Another way is to come straight here. 96 00:08:11,860 --> 00:08:18,350 So this where the code for the sub sampling time is as you can see over here says something time time 97 00:08:18,380 --> 00:08:23,430 ADC sample time three cycles just like we chose over here. 98 00:08:23,620 --> 00:08:25,280 Just like we chose three cycles. 99 00:08:25,840 --> 00:08:32,320 So I'm just going to change this to the largest number available which is for 80 cycles. 100 00:08:32,360 --> 00:08:37,840 I'm going to come over here and change this number three to four eighty and then we are still in the 101 00:08:37,850 --> 00:08:41,020 debug fuse on the screen to exit and then redo it. 102 00:08:41,020 --> 00:08:47,920 My project once that's done I'll just download onto my board then we'll return to the debugger. 103 00:08:47,920 --> 00:08:55,210 I'll click here now or just click here to continuously run my code and move in a potential meta now. 104 00:08:55,220 --> 00:09:01,300 And as you can see the funding is changing as I rotate the potential into I'm going to rotate it to 105 00:09:01,300 --> 00:09:02,270 the lowest value. 106 00:09:02,340 --> 00:09:03,570 You can see. 107 00:09:03,580 --> 00:09:04,090 This is it. 108 00:09:04,090 --> 00:09:06,590 And then I rotate it to the opposite direction. 109 00:09:06,640 --> 00:09:10,540 The value increases as I move towards the opposite right. 110 00:09:10,570 --> 00:09:13,060 So this is a DC continuous conversion. 111 00:09:13,090 --> 00:09:19,120 If you have any questions or you need further elaboration don't hesitate to send me a message and I'll 112 00:09:19,120 --> 00:09:20,800 see you in the next lesson.