1 00:00:02,940 --> 00:00:04,770 Delegates Welcome back. 2 00:00:04,800 --> 00:00:10,010 So in this lesson we're going to learn how to use multiple ADC channels. 3 00:00:10,160 --> 00:00:16,670 We did DMA I'm going to stun my Cuban mix and in this project I'm going to use to ADC Chanos. 4 00:00:16,840 --> 00:00:22,570 So I come over here create a new project I click and then I select my board. 5 00:00:22,570 --> 00:00:31,060 That's the discovery board then it's this one here for than it is this a double click to choose 6 00:00:34,740 --> 00:00:36,500 so once that is done I come over here. 7 00:00:36,520 --> 00:00:44,760 Claire or pins and this time I'm going to use channel 1 and Channel 2 so I can right click a one here 8 00:00:45,240 --> 00:00:52,320 and set it as a DC one input one and then a P2 as ADC 1 input 2. 9 00:00:52,590 --> 00:00:58,560 Once that is done we'll leave the clock configuration the same which the default setting now come to 10 00:00:58,560 --> 00:01:06,610 the configurations stop and then click under analogue here will click ADC 1 and then we come to parameter 11 00:01:06,610 --> 00:01:14,130 certain Mr said the ADC and this time we can reduce our ADC quick by providing a pre-schooler divide 12 00:01:14,130 --> 00:01:17,590 of 8 and then we can keep the resolution the same. 13 00:01:18,120 --> 00:01:22,580 And in this project what we want is we want to use the continuous mode. 14 00:01:22,590 --> 00:01:30,680 So I'm going to enable continuous mode here and I'm going to enable DMA here and I'm going to enables 15 00:01:30,680 --> 00:01:34,390 con mode as well like this enable. 16 00:01:34,630 --> 00:01:41,350 Then once that is done we come here and then because we've got two channels we said the number of conversions 17 00:01:41,350 --> 00:01:48,050 to two and then once we set a number of conversions to two you see the number of ranks have increased 18 00:01:48,050 --> 00:01:48,660 here. 19 00:01:48,740 --> 00:01:53,860 If I'm to set the number of conversions to 1 their rank will be just one rank. 20 00:01:53,960 --> 00:02:00,360 So because we are using to Chanos we said the number of conversions here to 2 like this. 21 00:02:00,380 --> 00:02:10,120 So I'm going to said the rank number one for China number one and then rank number two when set it to 22 00:02:10,120 --> 00:02:16,600 China number two like this and I'm going to say the sampling time to for eighty cycles. 23 00:02:16,720 --> 00:02:19,140 Green said this to four psychos as well. 24 00:02:19,830 --> 00:02:22,900 And then this is all there is to it. 25 00:02:23,530 --> 00:02:29,280 So remember if you have any questions as usual just send me a message or leave in the form. 26 00:02:29,680 --> 00:02:35,260 Once that is done we come to DME settings because we using DME and don't worry about using DME. 27 00:02:35,260 --> 00:02:42,550 Here we're going to treat the DME module on its own right to when we get here what we have to do is 28 00:02:42,670 --> 00:02:49,780 add DMA and when we add we select we select ADC 1 cos that's the only peripheral we've initialized and 29 00:02:49,780 --> 00:02:53,020 we want to check the data with size. 30 00:02:53,140 --> 00:02:55,720 This one here says half would fit. 31 00:02:55,720 --> 00:03:00,390 So let's just set it to a word which is 32 bit data size. 32 00:03:00,490 --> 00:03:06,250 What we want is one in a circular manner so that when is stores India in the memory of course up to 33 00:03:06,250 --> 00:03:06,810 the top. 34 00:03:07,720 --> 00:03:12,450 So we change here to a circular circular mode. 35 00:03:12,670 --> 00:03:16,810 Then once that is done actually this there isn't much to do. 36 00:03:16,810 --> 00:03:17,990 Just click OK. 37 00:03:18,100 --> 00:03:25,360 Then we generate the project click over here to generate the code and then I'll give my project a name. 38 00:03:25,390 --> 00:03:29,820 I'll call this ADC Kimi 39 00:03:32,810 --> 00:03:39,590 and then I'll select my two chain which they call you visioned version 5 and I click Okay over here 40 00:03:40,280 --> 00:03:48,590 and then it generates the code and then once it's done I click over here to open the project and then 41 00:03:48,590 --> 00:03:50,340 the project is open. 42 00:03:50,450 --> 00:03:57,330 So like I do always I'm just going to rebuild everything by clicking here. 43 00:03:57,920 --> 00:03:59,120 I just explained this a bit 44 00:04:03,540 --> 00:04:04,130 right. 45 00:04:04,150 --> 00:04:05,840 Zero errors to a is. 46 00:04:05,860 --> 00:04:14,530 So once this is done remember we assigned our PINs PSU and we use in p a one in P two we can verify 47 00:04:14,530 --> 00:04:15,150 that here. 48 00:04:15,240 --> 00:04:21,400 P1 appear to be a 1 is our ADC Channel 1 and Pier 2 so our ADC Channel 2. 49 00:04:21,400 --> 00:04:26,630 So what we're going to do is we're going to create an array of size 2 to store the resource of both 50 00:04:26,630 --> 00:04:34,270 the channels which come here in demand at TFR I'm going to come here I'll put it here make it global 51 00:04:34,870 --> 00:04:42,130 and I'm going to use you into 32 underscore T and I'm going to call it sense of value this time it's 52 00:04:42,220 --> 00:04:50,600 it's an array with size 2 and right here we need just one line of code to start the ADC and stock conversion 53 00:04:51,170 --> 00:05:04,490 and it is it is called a D.C. start DMA and we can double click here to see the parameters of this function 54 00:05:05,420 --> 00:05:07,430 and we can see the parameters. 55 00:05:07,560 --> 00:05:18,890 It says here is the ADC type typedef the ADC Hondo and then this one here is way to store the resource. 56 00:05:18,900 --> 00:05:21,130 This one here is the length. 57 00:05:21,130 --> 00:05:27,620 Like it says the length of data to be transferred from ADC pair forward to memory and P data here is 58 00:05:27,620 --> 00:05:32,360 the disk the destination buffer address and then the handler. 59 00:05:32,810 --> 00:05:41,850 Okay so I'm just going to come here and our ADC handle has been declared to us H A ADC 1. 60 00:05:41,890 --> 00:05:45,030 I just copy this and then bring it here. 61 00:05:47,260 --> 00:05:49,780 Would it embossed Amberson sign like this. 62 00:05:52,630 --> 00:05:57,150 And then the reader would just created to store the resource. 63 00:05:57,160 --> 00:06:01,160 I put it here and we looking for two resorts. 64 00:06:01,360 --> 00:06:04,330 So I put you here and that's all we need to do. 65 00:06:04,330 --> 00:06:11,290 So what I've done here in my setup is of connected to potential meters to one to be a one and another 66 00:06:11,290 --> 00:06:12,620 one to two. 67 00:06:12,670 --> 00:06:18,730 So I'm going to download onto my board and then go to the debug view and see whether indeed the changes 68 00:06:18,820 --> 00:06:21,870 occur as I turn my potential meter. 69 00:06:22,120 --> 00:06:31,840 So before I do that actually I'll just come to my debugger here and set this to reset and run like this 70 00:06:31,920 --> 00:06:33,730 and then okay and then okay. 71 00:06:34,030 --> 00:06:35,410 Then I click here to reboot 72 00:06:38,790 --> 00:06:44,320 and then I download onto my board so to test the code I'll just click over here to go to the debugger 73 00:06:50,550 --> 00:06:56,430 what I'm going to do is I'm going to add this to the watch window by double click in right click to 74 00:06:56,430 --> 00:06:58,270 watch window 1. 75 00:06:58,320 --> 00:07:03,600 Then I'll expand this and then I'll disable hexadecimal display like this. 76 00:07:03,600 --> 00:07:08,220 And once they start I'm going to click here to run the code and we'll see what happens. 77 00:07:08,220 --> 00:07:14,580 So currently I've position both potential meter to the opposite direction which would give the lowest 78 00:07:14,580 --> 00:07:15,480 value. 79 00:07:15,620 --> 00:07:21,390 So I'm going to run the code and I'm going to turn to potential meter to the other end of the to the 80 00:07:21,390 --> 00:07:25,940 other end which will give the maximum value of the potential meter. 81 00:07:26,150 --> 00:07:33,240 And that would in effect give the maximum voltage reading to the ADC so I'll click here to run and as 82 00:07:33,240 --> 00:07:40,750 I said there's the lowest value so I'm going to turn one potential meter as you can see it's showing 83 00:07:40,750 --> 00:07:47,310 the highest value so I'm going to change this channel to the highest finally as well just by turning 84 00:07:47,310 --> 00:07:50,570 the knob to the opposite direction. 85 00:07:51,110 --> 00:07:53,590 And as you can see it's also changed by others. 86 00:07:53,670 --> 00:07:58,530 So this is how we enable the ADC with DMA capability. 87 00:07:58,530 --> 00:08:04,810 And this is the best way to use multi-channel ADC by enabling them in this way that we've done. 88 00:08:04,860 --> 00:08:08,930 If you want to use five channels you can use the same method we just showed. 89 00:08:09,150 --> 00:08:11,440 Just by going through what we did. 90 00:08:11,640 --> 00:08:15,990 If you use in five channels you're going to have five rungs and you're going to go through five set 91 00:08:15,990 --> 00:08:17,700 of configurations. 92 00:08:17,700 --> 00:08:25,530 Over here over here if we are to use five channels then things like this. 93 00:08:25,530 --> 00:08:31,410 This would change to five and when we get to rank we would have to set a rank of five different channels 94 00:08:31,980 --> 00:08:32,900 and the rest. 95 00:08:33,060 --> 00:08:34,860 This side remains the same too. 96 00:08:34,920 --> 00:08:36,000 This is all there is to it. 97 00:08:36,000 --> 00:08:41,270 If you have any questions or you need more explanation don't hesitate to send me a message. 98 00:08:41,390 --> 00:08:42,570 Now see you in the next.