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stm32 уроки
stm32
stm32cubeide
stm32 программирование
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программирование stm32
cubeide
stm32 cubeide
аналого-цифровой преобразователь
stm32 ацп
stm32f103
stm32f103 adc
stm32f103 прошивка
stm32f411
stm32f401
stm32 осциллограф
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00:00:00
I started studying such interesting
00:00:02
things as analog-to-digital
00:00:04
converters stm32, looking ahead and
00:00:08
sterilizing these peripherals with an extremely
00:00:10
rich variety of options for setting up
00:00:12
installation modes. To be honest, I wanted to
00:00:15
quickly go over the basics for myself,
00:00:17
but in the course of this, in the elevator, the whole next
00:00:19
work, which I will now tell you about
00:00:22
checks, I assembled a small
00:00:23
test bench and in order to somehow
00:00:25
limit the task, I will tell you about
00:00:27
the use of only one
00:00:29
cbs channel of multi-channel polling, the main
00:00:33
goal I will set is to achieve maximum
00:00:35
digitization speed on this one channel. In
00:00:38
the process of experiments, I even
00:00:40
got some semblance of an
00:00:41
oscilloscope, they want words in a graph it can be
00:00:43
called with a very big stretch; in general, the
00:00:45
purpose of all this was in no way
00:00:48
connected with log graphs; what happened
00:00:50
was rather an accidental practical
00:00:52
application; the first version did not
00:00:54
have the ability to synchronize at all and
00:00:56
simply drew a piece of the input signal at an
00:00:58
arbitrary moment in time,
00:01:00
although it already looked quite
00:01:01
interesting later I made some
00:01:05
pathetic attempt to write a
00:01:07
synchronization system, but more on that a little later, so
00:01:10
I conduct experiments on a black
00:01:12
blue pill scarf and the differences from the
00:01:14
original are blue in most colors
00:01:16
and end in new ones, we took
00:01:17
duplicate power supply pins to the ground and
00:01:20
also slightly redistributed the rest of the
00:01:22
LEDs we made on the pin pibi 12 they are
00:01:25
on pis 13 as in the original and to be
00:01:28
honest, I didn’t immediately understand why it didn’t
00:01:30
blink for me the first time,
00:01:33
as far as I know the same
00:01:35
103 controller is in the oscilloscope up to
00:01:37
138
00:01:39
and there the general program of work
00:01:40
has already been brought to mind as far as this is concerned
00:01:42
perhaps for this type of oscilloscope
00:01:45
in general I was more interested in the general
00:01:47
principles of managing the configuration of
00:01:49
data reception from this periphery, so we know
00:01:52
that an ADC
00:01:53
is a device for converting an
00:01:54
analog signal; a proportional
00:01:56
digital code that transmits information
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about some physical parameters,
00:02:01
voltage, temperature, acceleration, and so
00:02:04
on is
00:02:05
typical for all ADCs that they find
00:02:07
some approximation of the true
00:02:09
signal, while the accuracy in
00:02:11
voltage measurement will be related to the bit depth
00:02:13
cp and the accuracy in time with the speed of
00:02:16
its operation after all these vicissitudes,
00:02:18
the signal can be represented in the form of steps,
00:02:21
this can be called a quantum signal
00:02:23
both in amplitude and in time or in
00:02:25
other words discrete or digital in
00:02:28
general, what can be said about how
00:02:31
it works for digital conversion
00:02:32
in system32 controllers, but probably
00:02:35
in a nutshell, the
00:02:37
functioning mechanism is depicted in the block diagram
00:02:39
in the reference manual. Is anything clear from
00:02:42
this diagram? I’m up for debate
00:02:44
so I still decided to go through
00:02:46
trial and error, for this I generated
00:02:48
several test signals from the generator,
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threw them into the furnace, my fathers looked at what
00:02:53
came out initially, I didn’t have
00:02:55
a screen, I did everything in a more labor-intensive
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but more informative way, in
00:02:59
fact, I’m going to tell you about this
00:03:01
except f1 family of controllers on
00:03:03
aliexpress you can buy these
00:03:05
boards with f 411 and f 401 chips,
00:03:10
they are called black saw and are actually a
00:03:12
logical continuation of the family of
00:03:14
32-bit microcontrollers.
00:03:16
take away they are built on a more
00:03:18
modern core
00:03:19
arm cortex m4 they have higher frequencies
00:03:22
hardware support for floating point
00:03:24
faster cp an expanded set of
00:03:26
commands for digital mathematical
00:03:28
signal processing a number of other useful
00:03:30
goodies but in general the logic of working with chick
00:03:32
except for a couple of new useful features
00:03:34
similar to saw one family, so at
00:03:36
least in this video I wo
00:03:38
n’t focus on them separately.
00:03:41
Another important question that I had to
00:03:43
solve before starting the fcp test
00:03:45
is full-featured in-circuit
00:03:47
debugging. The simplest and most common
00:03:49
programmers, Stalin KV-2, require
00:03:52
some hardware modifications to
00:03:53
be able to receive data. about
00:03:55
variables while working in real
00:03:57
time, by the way, using the link in the description, you
00:04:00
can look at the starting article pstn
00:04:03
if there are those who don’t know
00:04:04
what I’m talking about and what kind of things I’m twisting my hands
00:04:07
and so the revision and Stalin is you have
00:04:10
one connector for two more legs
00:04:11
of the microcontroller
00:04:12
this is from its own and the signals grow while its
00:04:15
own this leg is for output
00:04:17
data from a programmable device in
00:04:19
debug mode and rst can perform a
00:04:21
hardware restart of a programmable
00:04:23
controller specifically in these experiments I
00:04:25
will use only from mine
00:04:27
but it makes sense to remake and Stalinka
00:04:29
immediately and for outputting a reset in general In these
00:04:31
programmers, the Chinese install controllers
00:04:34
on the principle that this is what it will be, in
00:04:35
most cases the circuit will be
00:04:37
similar to the 100 third ones, like mine, the
00:04:39
reworking of these whistles was discussed by
00:04:42
many bloggers telling us we’ll
00:04:44
leave 32, so there’s plenty of information on what and how to
00:04:47
solder, so here’s
00:04:50
how it turned out I'm
00:04:51
using useless 5 volt
00:04:54
leads, they were connected
00:04:56
through via vias so
00:04:58
on one side I isolated 4 and of course
00:05:01
you need to remember to break the track with the
00:05:03
incoming 5 volt voltage and
00:05:05
now let's get back to the real topic of the video
00:05:08
this is analogue digital conversion is
00:05:10
actually the general idea This thing is to
00:05:12
get numbers instead of volts at the input,
00:05:14
etc.
00:05:15
but the implementation of the analog-to-digital
00:05:17
converters themselves may
00:05:19
differ significantly; follow the link in the description to find
00:05:21
an article in which, among other things, the
00:05:23
operating principle of
00:05:25
successive approximation ADCs
00:05:26
used in stm32 is briefly described and, in general, everything
00:05:29
that is unclear here you can try to
00:05:31
clarify from this article for my
00:05:34
tests I use a generator Signals
00:05:36
specifically, the first test I carried out was
00:05:38
on a sawtooth signal, this allows you to
00:05:40
clearly see problems in the data flow
00:05:42
if they arise, it is also convenient to read the
00:05:44
frequency in general, and in general, all this
00:05:47
was placed on the table in the form of an
00:05:48
improvised stand, and so for
00:05:51
programming from the general settings, an
00:05:53
external quartz was used according to the standard
00:05:57
and in the system settings, debug is enabled,
00:05:59
and in order to be able to send data, a
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three-wire one with
00:06:03
asynchronous transmission is selected;
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the compartment is configured with a one-time
00:06:07
single-channel measurement with soft
00:06:09
start, as I already said, everything that I
00:06:11
describe here, you can look at the article in general
00:06:14
on setting up the debug, Westie has from road in
00:06:16
which everything is explained how and in a
00:06:19
nutshell, the idea is that to
00:06:21
output information from the microcontroller to the computer,
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use the
00:06:25
printf command, which is familiar to many,
00:06:27
but in order for everything to work correctly in debug mode,
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we need to redefine the
00:06:30
wrike functions,
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how to make our own is written
00:06:34
right there, from the same document, we find out what else
00:06:36
needs to be checked so you have the frequency in the
00:06:39
configurations debug, in fact, now we do
00:06:41
everything as the smart guys told us, we add a
00:06:43
library from etc.
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and we redefine the right function, I
00:06:47
already wrote it behind the scenes in a slightly
00:06:49
modified form by combining two
00:06:51
pieces of code
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is up now the into 1 so that we don’t have to
00:06:55
get up twice, let’s see what next I declared an
00:06:57
array of 256 16-bit variables, this
00:07:01
will be needed to store ccp data
00:07:04
before with an infinite loop it would be nice to
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calibrate the ADC, in this case
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we calibrate and cp number one actually
00:07:11
exists in the document, all the functions of the
00:07:14
hal library are described, including if you go to the
00:07:16
cp section, then there we will find everything related to
00:07:18
this block,
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the only thing is the
00:07:26
main functions, there is also a block of
00:07:28
advanced functions, it is also only here
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just below
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and here is the
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most ingenious code of the main program, everything
00:07:38
that is done here in the first for loop
00:07:40
is launched, the ADC
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is expected to be ready, the data is stored
00:07:43
in an array, and so all two hundred and
00:07:46
fifty-six memory cells are filled, the next
00:07:49
for loop transfers all this to the debug
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interface using the printer a function
00:07:53
to highlight the beginning and the end of the data I
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printed a lot of asterisks, then
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the LED just blinks to know
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the controller is not frozen, we will also need to
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configure the debug parameters
00:08:10
here you can scan it on the
00:08:12
link if it is connected via USB then
00:08:14
its serial number will be indicated, but in general this is not
00:08:16
necessary, you need to include
00:08:18
serial in the viewer and here you can specify the
00:08:20
clock frequency that is the same as in the
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clock settings of the microcontroller; in
00:08:24
a specific case, this is 72 megahertz, the
00:08:27
word frequency can also be set,
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or you can leave it on auto, then we can
00:08:33
click the bug in the toolbar and
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after that we get into the debug mode,
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here you can already add variables
00:08:39
that we want to look at
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step-by-step debugging
00:08:48
I carry out
00:08:50
di si and I will get mappings of all members of
00:08:52
this array also to
00:09:07
break points, I will do this at the end of the
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work from the circuit and after working with the
00:09:12
printf function, we will
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then do one more very important
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thing that will allow us to receive
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data from prints console
00:09:23
on the move
00:09:25
from q and t m data console turn it on and
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then go to its settings on the top
00:09:32
left the frequency of our processor will be indicated on the bottom
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left turn on part
00:09:36
number zero by checking the box I
00:09:38
already had a check mark here since I turned it on
00:09:41
during checks earlier then you can click
00:09:44
on the start button and we will be at a previously
00:09:47
designated breakpoint, all the
00:09:49
commands above will already be executed, and
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sometimes my own has some
00:09:53
problems during transfer and losing some of the
00:09:54
data, for example, it is clear that the transfer
00:09:57
was not completed with asterisks, or maybe
00:09:59
I was unlucky, so in general, restarting the
00:10:01
debug solves this problem
00:10:03
also information We have created a buffer that
00:10:06
has blocks for viewing variables on the right,
00:10:08
if you restart the debug and transfer the
00:10:10
data again, everything has already been transferred
00:10:12
correctly, in general, I take all these
00:10:14
numbers and throw them into excel, where a graph is immediately
00:10:17
built from the graph, we will
00:10:19
determine the sampling frequency knowing the
00:10:21
original frequency of the signal and the number of
00:10:23
points in the period of
00:10:24
points turned out to be exactly 100, while the
00:10:27
period of the signal is 500 microseconds and
00:10:29
we have 5 microseconds or 200 kilohertz, these
00:10:32
are the pies, let me remind you that this is a
00:10:35
single measurement mode, launch on all with the
00:10:38
skoda function, the program is the next mode
00:10:41
that we will look at is the
00:10:43
single-channel continuous
00:10:44
conversion mode, the
00:10:45
feature is that it is not necessary
00:10:47
restart the ADC and when the data is ready, the
00:10:50
next conversion will go immediately,
00:10:52
select the appropriate mode in the
00:10:54
configuration of the pulp and paper mill and rebuild the project
00:11:05
according to the code,
00:11:07
jump out of the loop to the top and in fact you
00:11:11
can start debugging again,
00:11:14
turn everything on
00:11:16
again, run the debug to the breakpoint,
00:11:27
the data
00:11:29
poured into the console from where we
00:11:31
successfully let's copy and paste it
00:11:38
into the
00:11:40
target and see that everything is cool, but not a single
00:11:42
period fits in, it's not very
00:11:44
convenient, so what we'll do is increase the
00:11:46
frequency of our saws from two kilohertz to
00:11:49
four kilohertz, and then at the tempo of a waltz
00:11:51
we'll repeat all the steps again,
00:12:04
now everything is great
00:12:06
apple counting
00:12:07
and period the duration of the period this time is
00:12:10
250 microseconds,
00:12:17
you get
00:12:19
436 kilohertz and this is good news the
00:12:23
following modes will work through a
00:12:26
direct memory access unit or Dima
00:12:28
this thing can transfer data and
00:12:30
pour it directly into our array bypassing
00:12:33
the process and this is a very convenient thing
00:12:35
to remove loads from the main core,
00:12:37
we go to the dm configuration and create a
00:12:40
new channel there, tell it to transfer from the
00:12:43
ADC to memory, and in general, here
00:12:47
we comment on everything we wrote earlier
00:12:49
and write a hal function to start the ADC in the
00:12:51
transmission mode, raise it, and give it
00:12:54
a pointer to our buffer array and
00:12:56
write its length 256, then
00:13:04
everything goes according to the old scheme, we go to
00:13:07
debug, run it, take the numbers and
00:13:09
draw hyssop in Excel,
00:13:17
the problem is that due to the increase in the frequency of selection, they
00:13:19
go to the point so often that for two hundred and
00:13:21
fifty-six pieces there is not a single
00:13:23
period,
00:13:24
but we- then we already know how to deal with this
00:13:25
problem, we go to control the generator and
00:13:28
change the frequency to 8 kilohertz and of course
00:13:30
we repeat everything again,
00:13:40
read
00:13:42
the points and it turns out 107 points
00:13:44
per period, calculate the frequency and it turns out
00:13:46
856 kilohertz and this is a wonderful miracle
00:13:50
since we are already one step away from megahertz, the question is
00:13:52
why not megahertz is decided by the
00:13:54
operating frequency of the ADC
00:13:55
since the core frequency was set to
00:13:57
72 megahertz, the maximum permissible
00:14:00
ADC frequency is 12
00:14:03
megahertz, go to the
00:14:05
clock configuration and change the frequency there to 56
00:14:08
megahertz, while the ADC can now be
00:14:10
set to 14 megahertz and this is what we
00:14:13
need Perry, we collect everything, we go to debug and
00:14:16
again we turn everything on again, we received
00:14:18
the data and what kind of crap is this, we go to
00:14:28
hell, we register the frequency of 56 megahertz and
00:14:31
again now we count the
00:14:45
points, remember that our frequency is 8
00:14:47
kilohertz, they drink accordingly 125
00:14:49
microseconds, in total we have a wonderful miracle 125
00:14:53
divided by 125 it turns out to be exactly 1
00:14:55
megahertz
00:14:58
and what do you think
00:15:00
everyone got a megahertz and we’re happy but there’s
00:15:02
no there is another mode now I’ll show you
00:15:04
this mode of simultaneous operation of two ADCs
00:15:07
with alternation for 7 cycles if this is
00:15:09
applied to the same channel then
00:15:11
it’s doubled conversion speed
00:15:13
test program looks like this you need to
00:15:15
register the launch of the second cp and the next
00:15:17
line use multi mode start
00:15:19
to launch the first leading cp the data
00:15:22
is saved all the same variable, with
00:15:25
one exception the Odessa variable
00:15:27
now needs 32-bit it’s all about the
00:15:29
way the data is saved in
00:15:31
interleaved mode they are stored in 1 32-
00:15:34
bit register and the high half is
00:15:36
cp number 2, the low half is cp number one,
00:15:39
respectively, when we work with
00:15:41
our buffer, this must be taken into account; we
00:15:44
will transfer to the base in two passes,
00:15:46
first shift to the right by 16 bits,
00:15:49
we form the data of hook number 2 and
00:15:51
then transfer it to the next one
00:15:53
we update the senior half of the lines and leave
00:15:56
only the lower two bytes, this is the
00:15:58
given social one died and we transmit,
00:16:01
repeat all two hundred and fifty-six times
00:16:03
and voila, when I saw the data that arrived, I grew up
00:16:06
a little and started moving because the points from
00:16:08
different fathers jumped
00:16:09
and I already thought that this was not we’ll fix it,
00:16:12
but then I remembered that I don’t
00:16:13
calibrate the second cp anywhere,
00:16:15
this must be corrected, otherwise it
00:16:17
will be crooked and then I started digitizing to
00:16:20
increase the frequency of the saw to 20 kilohertz
00:16:23
and everything became beautiful, that is, the channels
00:16:25
work very smoothly and nothing jumps,
00:16:29
here is a graph of speed characteristics by
00:16:31
mode, let's look at more digitization for a more
00:16:35
complex signal, here's a burst
00:16:37
because the loop tells us that this
00:16:39
is called a cardinal sine,
00:16:41
the highest frequency of this signal
00:16:43
is 162 kilohertz, so it
00:16:47
will look scary at 436
00:16:50
kilohertz to the bottom megahertz and it already
00:16:53
looks like the truth if you connect the lines
00:16:55
spline, it will be perfect, and two
00:16:59
megahertz creates a very beautiful
00:17:01
picture and, by the way, very clean, and in
00:17:04
the end I made a pathetic attempt to make something
00:17:06
like an oscilloscope using a
00:17:09
128 by 64 pixel screen, I also made an attempt,
00:17:11
but without
00:17:12
some synchronization, the results of its
00:17:14
work are more random than constant
00:17:17
Well, don’t blame me, just ten lines of
00:17:19
Indian code,
00:17:20
that’s all I tried, really, so like it, oh
00:17:38
well

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Привет! Занялся я тут изучением такой интересной штуки как аналого-цифровые преобразователь в STM32. Интересные сайты: Паяльник https://cxem.net/ ST реализовали эту периферию с крайне богатым разнообраpием вариантов настроек, режимов и установок. Я если честно хотел для себя быстренько пробежаться, но походу этого влип в целую исследовательскую работу, о которой расскажу в этом видео. *************************************** Для прямой помощи каналу, перевод с банковских карт: https://yoomoney.ru/to/4100116712276152 Модули производства TDM Lab: https://vk.link/tdm_lab Группа ВК: https://vk.com/tdm_lab Рекомендованная литература: *************************************** STM32 «Работа с АЦП — независимый режим» https://dzen.ru/a/YA2Efs35qwValMuY STM32 ч.1 «Первые шаги» https://dzen.ru/a/XtI1xJMqhzbvNJHD Статья про АЦП в моей группе ВК, там код программ в более человеческом виде представлен https://vk.com/@tdm_lab-stm32-i-cube-ide-izuchaem-s-nulya-do-mastera-za-rnd-dnei-ch *************************************** Учебный проект из видео: https://drive.google.com/drive/folders/1AHhqWyEpOa4VCzVhGOrud3UN-dkKxO8o?usp=sharing *************************************** Алиэкспресс: ***************STM32*************** STM32F103C8T6 Black http://ali.pub/579d2l STM32F401CCU6 http://ali.pub/56s1yb STM32F411CEU6 http://ali.pub/56s1yb STM32F103C8T6 Blue http://ali.pub/4s0k7j Программатор ST-Link V2 http://ali.pub/56weqg *************************************** 3,5" TFT LCD http://ali.pub/56w5gl 1,8" TFT SPI LCD http://ali.pub/56w4oe 1,3" OLED I2C LCD http://ali.pub/56w8vh ЖК-экран с клавиатурой, 1602 для Arduino Uno http://ali.pub/56wau2 MAX7219 модуль 8-сегментный http://ali.pub/56waa1 TM1637 Модуль http://ali.pub/579dmt Arduino Mega Atmega2560 http://ali.pub/56w5jb Arduino Uno Atmega328p http://ali.pub/56s0bz Arduino Leonardo ATmega32u4 http://ali.pub/56weg5 ESP-12E WeMos D1 WiFi ESP8266 http://ali.pub/56whd5 Arduino Nano ATmega328 http://ali.pub/56weyt Модуль клавиатуры 3 x 4 http://ali.pub/56w9sx TTP229L сенсорная клавиатура http://ali.pub/579pie Фотоэлектрический модуль http://ali.pub/56wh5r ADS1115 АЦП 16 бит http://ali.pub/56s0mv MCP4725 ЦАП 12 бит http://ali.pub/56s2f8 MCP3421 АЦП 18 бит I2C http://ali.pub/56s17o MCP23017 12864 128*64 LCD I2C адаптера http://ali.pub/56w58f PCF8574 адаптер I2C для LCD http://ali.pub/56waqd ACS712 Датчик тока http://ali.pub/56s27u nRF24L01+ беспроводной радиомодуль http://ali.pub/56wgx7 AD9850 DDS генератор http://ali.pub/56s0yq SI5351 генератор сигналов 8KHz-160MHz http://ali.pub/56s3dg KY-008 лазерный модуль для Arduino http://ali.pub/56whg9 Реле электромагнитное 5В http://ali.pub/56wh2u XL6009 DC-DC Вход: 5-32В Выход: 5-55В в http://ali.pub/56w5m8 Повышающе-понижающий DC-DC 5A/80 Вт http://ali.pub/579qeh AC-DC 12V 1.5A 5V 2A http://ali.pub/56w9xs AC-DC 5В/12В/100мА/500мА http://ali.pub/56w9zx

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