ADC in STM32 || Single Channel || Keil

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[@noweare1]

I did not know that the dma actually causes an interrupt. I thought only adc_start_it would cause the interrupt. I also thought a "word" is 32 bits and 1/2 word is 16 bits so that it would be more efficient for storage. I have more trouble with multiple channels using continuous conversion mode. Might be that my sample time is too low. Thanks for your tutorials, they are awesome. I do like the hal low level drivers better as the reference manual describes how things work with respect to the registers. The Low Level drivers are kind of self documenting functions for manipulating the registers. Sometimes with the HAL drivers it takes a bit more studying to find out what the function does.

[@gavinhuang424]

No need HAL_ADCEx_Calibration_Start() ?

[@krzysztofkabaa3522]

Thanks Dude, grate work! Almost everything working. Interrupt, and Pollforconversion methods work great. I only can't figure out why DMA method won't work in my system. I watched Your video five times, everything looks fine, but on screen still have "0". I use Nucleo F303RE, so there is a few hardware difrents. Do You have some idea, what could i did wrong?

[@sunita31415]

Enable DMA Continuous Requests.

[@toan3931]

Great tuturior. Sir, can you explain some information about calibration, plus_side and minus_side. Thank you so much.

[@electrolabs337]

I love your videos... thank you for your time and effort.

[@ControllersTech]

👍

[@prashantwaiba2290]

Can you make a video on differential ADC mode?

[@junnanpan7409]

excellent video! thx! I have a question. how do we konw, that the interrupt get triggered on conversion? The HAL_ADC_Start_IT function was not place in the while-loop. that means adc_started only once, wenn the program ran.

[@ControllersTech]

HAL uses callbacks for all the interrupts. So whenever a interrupt is triggered, it will serve the interrupt, and call the callback in the end. This is where we write our code. The purpose of the interrupt is that it will be called only once and then it will automatically trigger, whenever the data is available. In some peripherals, like uart, HAL disables the interrupt after serving it once, but that is not the case with ADC. So we can just call it once and it will keep triggering whenever the conversion is complete.

[@EmbSysDev]

Excellent videos !! Thank you very much!!

[@miguelangelyepesvalencia9424]

Excelent video. Hey how you make to set se font color on sublime text?

[@orph4nsx]

Best channel for STM32

[@bennguyen1313]

For the HAL_ADC_Start / HAL_ADC_PollForConversion, does the '100' refer to the a timeout.. in cycles/microseconds? I assume the timeout should be based on the ADC clock and the conversion time setting? Regarding the interrupt method (HAL_ADC_Start_IT() and HAL_ADC_Start_DMA()), if the interrupt/callback happens immediately after ADC conversion, is it possible the DMA has not yet transferred the data to the memory?

[@ControllersTech]

100 refers to the time in milliseconds Once the interrupt happens, the ISR takes care of the rest. That means it transfers the value to the variable and sets the conversion complete interrupt bit. When we read the value inside the conversion complete function, that bit ( conversion complete bit) gets cleared.

[@martinlintzgy1361]

why use a 32 bit variable to store a 12 bit result? Sureley, a half word (16 bit) would be a better fit?

[@ControllersTech]

Yeah it is.. 32 bit is the argument of that function, so i did..

[@MsSuperasdfghjkl]

Hi. Found this informative. But can someone help me. I want to read 1024 values from same adc using dma mode. Can i just pass a buffer of size 1024 and set dma read size to 1024? Will that do or i shud do the same as this and memcpy to my buffer. This might slow down for my application.

[@ControllersTech]

You can do the first case…

[@MsSuperasdfghjkl]

@@ControllersTech thank you for the reply. Will try!

[@ibrahimshasirajithin9150]

Hey this is Very nice. And my kindly req. pls avoid the background Music.. 😀

[@ControllersTech]

It's not there in the new videos

[@EmbSysDev]

I have one issue with the ADC. The maximum value i am getting is 4024 counts instead of 4095.All voltage are equal to 3.3V,which I verified. Is there any calibration , needed before using ADC ?

[@ControllersTech]

I don't know. If u have any other sensor, check with that. Or better check with potentiometer. I get proper values myself.

[@EmbSysDev]

@@ControllersTech I am using a potentiometer for the trial. Will revert if I get the problem.Thanks!

[@EmbSysDev]

Ok calling HAL_ADCEx_Calibration_Start(&hadc1); Solved the problem of the maximum counts.

[@ahmedahmed-yg5fl]

I can't read voltage less than 80mv the adc value 0x0000 at 50mv 😢

[@ControllersTech]

Whats the range of voltages you are reading ? And whats the ADC resolution ?

[@ahmedahmed-yg5fl]

@@ControllersTech i use stm32f103 with 12bit adc . My adc read 60mv to 3v but i want to read from 1mv to 3v

[@truongquangbaokhanh2910]

the Temperature on STM32 board so suck right. whatever. Thank u so much

[@k1t5un31]

Thank you very much great videos

[@andresceballos2709]

hello great video I have a question How can I use the ADC's calibration functions? * HAL_ADCEx_Calibration_Start (); * HAL_ADCEx_Calibration_SetValue (); * HAL_ADCEx_Calibration_GetValue ();

[@voidzs8882]

i just here for listen song because idk songs name lol

[@pusatberk4193]

thanks I m wait usb HID

[@ControllersTech]

Will work on that soon..

[@pusatberk4193]

@@ControllersTech Thank you so much

[@babotvoj]

Hallo, when I put the potentiometer in the middle and measure it with the multimeter it has 1,6V. When I connect the adc to the potentiometer it drops to 0.1V. Do you maybe know what's the problem?

[@АндрійБогдан-д8ь]

Hello! If I have all the ADC channels connected to pins, how exactly should I determine in the function which channel to read data from? I will be grateful for the answer!

[@ControllersTech]

If ypu are using multiple channels, you can't read single channel officially. I have made a video on how to do it though. The video title is " read multiple adc channels without DMA"

[@АндрійБогдан-д8ь]

@@ControllersTech Aw, thank you very much! The video really helped.

[@Just_Vishal]

can you explain how code work and dma call function and get adc value ?

[@blasalvadorwii]

Excellent ! Thanks

[@dajianghe]

Nice tutorial. Have you done OPAMP + ADC for G4 before?

[@GlorytoourGod_Jehovah]

Sir, your way of explanation is great. sir, can you please explain how to use more than one input(2,3,4..) in single adc channel thank you in advance

[@ControllersTech]

What you mean more than 1 input ? If you have multiple devices, use multiple channels.

[@briant4326]

I've been going through some of you videos step by step and really appreciate your work. Quick question: I've been able to work with the stm32cubeide on my windows pc but on my linux I can't get the ide debugger to connect with my nucleo board. any advice? I can just keep working on windows for now but would be really nice if i could be my linux to handshake with my nucleo board. thanks

[@ControllersTech]

I don’t know. I used windows, linux and now mac. I never faced any issues with debugger so far.

[@briant4326]

Thanks for replying. I got it to work. I had to use the "serial scan" feature in the debug config option in the ide. I sort of don't know what serial number it is refering too. maybe the serial number of the uC on my nucleo board? anyways thanks for the great tutorials again. @@ControllersTech

[@kiausiniukova2842]

Any ideas how to improve accuracy on adc ? I use timer interrupts to run and stop adc to get 1 value of a battery. I get +-0.2 (sometimes even 0.4 ) Volts error which is not suitable for me.

[@ControllersTech]

depends on a lot of things. like the power supply, other components, soldering, wires, etc.. ST have a big PDF on this. google it

[@mikejones-vd3fg]

One way to reduce error is to take an average. So instead of one voltage reading, you make a "for loop" that does it 100 times, each time adding to a running total, then dividing that total by how many your loop went around gives you an average. Then those random off results get minimized in the average.

[@FunSpark-Horizon]

I have a question. why did you defined a 32bit variable (adc_val)? since our data is 16 bit (word), we did not need 32 bit variable right?

[@ControllersTech]

No we don't. We can use 16 bit variable..

[@FunSpark-Horizon]

@@ControllersTech thank you very much

[@egar1956]

Hi, in ADC_DMA example, I've tried to put some code in WHILE loop( gpio toggle w/delay) but it didn't work . I had to configure ADC without INTERRUPT and restart ADC with DMA inside the while every time. Thanks for yours videos and blog

[@ControllersTech]

Reduce the ADC clock, it will work

[@egar1956]

@@ControllersTech First of all, I'm very glad for your soon reply. I'm working on NUCLEOF091 and stm32cubeide. The posibilities of settings for the ADC clock are: 14MHZ internal or APB1_clk /4. I've got results when the APB1 clock was reduced or when I increased the Sampling time. My conclusion is to make slower the ADC for this feature. Thanks again. PD:I chose 239.3 cycles of sampling time and APB1 CLOCK can stay at 48 MHz (maximum speed for this micro)

[@ControllersTech]

Basically what happens is when you are sampling at higher rates, the dma interrupts get triggered at higher rates too. So the control always remain in those interrupt handlers. Most of these adc devices Don't need high sample frequency anyway

[@egar1956]

@@ControllersTech understood

[@YauheniyLoika]

Hello. Thank you. I Use board NUCLEO-F446RE. Continuousconversion mode is enable (hadc1.Init.ContinuousConvMode = ENABLE;) . But using Interrupt or DMA I get only one conversion and then no interrupts. Therfore I added in HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc) start the ADC again.(in your code it's comment// HAL_ADC_Start_IT(&hadc1);) and it works. This is strange ))

[@sunita31415]

+1