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ETHERNET Configuration PART 2
Jul 17, 2021
Purchase the Products shown in this video from :: https://controllerstech.store ________________________________________________________________________________________ ETHERNET PART1 ::: https://youtu.be/8r8w6mgSn1A ETHERNET PART2 UDP Server :::: https://youtu.be/l193dYefUE8 STM32 Ethernet Playlist :::: https://www.youtube.com/playlist?list=PLfIJKC1ud8ggZKVtytWAlOS63vifF5iJC STM32 Playlist :::: https://www.youtube.com/playlist?list=PLfIJKC1ud8gga7xeUUJ-bRUbeChfTOOBd DOWNLOAD THIS PROJECT FROM :::: https://controllerstech.com/stm32-ethernet-1-connection/ ________________________________________________________________________________________ ******* SUPPORT US BY DONATING****** https://paypal.me/controllertech *******Join the Membership******* https://www.youtube.com/channel/UCkdqtSMnhYuMsJkyHOxiPZQ/join
View Video Transcript
0:00
[Music]
0:09
welcome to the second video of the
0:11
ethernet configuration
0:14
you must watch part one before watching
0:16
this video
0:18
in the previous video we configured the
0:20
mii with the memory configuration
0:22
and as i mentioned this video will cover
0:25
the rmii without memory configuration
0:28
option
0:34
so let's start the cube id
0:40
i am using stm 32 f 7 5 0
0:43
discovery board and here is the ethernet
0:46
port on it
0:49
give some name to the project and click
0:52
finish
0:54
let's see the board schematics
1:03
here is the ethernet module and as you
1:06
can see
1:07
it have the rmii connection type
1:15
first of all i am selecting the external
1:17
crystal for the clock
1:25
the ball have 25 megahertz crystal and i
1:28
am running it at the maximum
1:30
216 megahertz frequency
1:43
now let's go to the ethernet tab and
1:46
enable it
1:51
this entire thing looks too messy let me
1:53
clear the pin outs first
2:12
okay now let's enable the ethernet rmii
2:16
we will configure the parameters later
2:18
let's check the pins
2:19
first as i mentioned in the first video
2:23
also
2:23
the cube mx will mostly configure the
2:26
wrong pins
2:27
so make sure the pins are configured
2:29
exactly as they are in the schematics
2:39
apparently they are correct here but if
2:41
any pin is incorrect
2:42
all you have to do is click on the
2:44
correct pin and choose the function
2:47
the other one will disable itself
3:01
the pins are fine so let's go to the
3:04
parameter setting
3:06
notice that unlike the first video here
3:09
we don't have the option to configure
3:11
the memory
3:12
so let's configure the rest of the
3:14
options
3:16
make sure the p-h-y address is zero
3:19
this zero should be selected for
3:21
on-board ethernet port
3:23
just like i have on my discovery board
3:26
if you are using any external module
3:29
like the one
3:29
shown in the picture i think you need to
3:32
keep it one
3:33
i am not very sure about this i will
3:36
leave the comment later
3:38
if i find anything
3:43
now leave everything to default
3:49
this is it for the ethernet
3:51
configuration
3:53
now let's configure the lwip
4:04
again we have d h c p and we will
4:07
disable it
4:09
now we will manually configure the i p
4:12
subnet
4:12
and the gateway this will be the static
4:16
ip for our board
4:18
leave everything to default and go to
4:21
second option
4:23
here we will configure the heap size
4:26
just like the first video we will keep
4:28
it 10 kilobytes
4:31
notice here that we don't have the
4:32
option to configure the address for the
4:34
heap
4:36
but that's ok leave the rest of them to
4:39
default settings
4:41
we don't need to configure these
4:44
make sure the checksum is enabled
4:48
that's it for the lwip configuration
4:52
this was considerably easier as compared
4:55
to the previous video
4:57
now i am enabling the cache
5:02
and finally we will configure the mpu
5:09
but before that let's build the code
5:12
once
5:12
to check for the sizes
5:21
i only have one ram here and everything
5:24
is packed in it
5:32
the txdma descriptor is 128 bytes in
5:36
size
5:38
also there is tx buffer which wasn't
5:40
present in the previous video
5:43
also keep an eye on their locations in
5:46
the memory
5:50
we have r x buffer and e m a descriptor
5:54
also
6:04
if we check the ethernet if dot c file
6:07
here you will notice that
6:08
there are no sections defined for the
6:10
buffers if you remember
6:12
the previous video this is how they were
6:15
defined
6:16
well there is a valid reason for that
6:22
this is the memory organization for the
6:24
f-75 series mcu
6:29
the ram is made up of dtcm sram
6:32
1 and s ram 2. if you notice the memory
6:36
locations of all the descriptors and
6:38
buffers
6:38
they are all defined in the dtcm region
6:42
if you have watched my previous videos
6:44
on memory configurations
6:46
you might remember that the tcm memories
6:48
are non-cachable
6:50
so if we keep the dma descriptors in the
6:52
tcm region
6:54
we don't need to worry about cache
6:55
coherency and that's what is happening
6:58
here
6:59
technically if i don't do any memory or
7:01
mpu configuration
7:03
the code will still work all right this
7:06
i will show in the end of the video
7:09
but this won't be the case for everyone
7:11
so i am going to go ahead with memory
7:13
configuration
7:15
i am going to shift the descriptors and
7:17
buffers to this sram 1 region
7:23
so let's go back to our cube mx and
7:26
configure the mpu first
7:34
enable the region
7:37
the base address will be the address for
7:39
the sram 1.
7:46
now the size let's see how the memory
7:49
will be allocated
7:51
the allocation starts at 2 million 10
7:53
000
7:54
and here we will keep the dma rx
7:57
descriptor
7:58
this will occupy 128 bytes
8:02
and there we will keep the d-m-a-t-x
8:04
descriptor
8:05
which will occupy another 128 bytes
8:09
then we have the rx buffer and the tx
8:12
buffer
8:13
they both are taking 5.95 kilobytes of
8:16
memory each
8:23
altogether they will take 12.15
8:26
kilobytes of memory
8:34
so in the mpu configuration choosing a
8:37
16 kilobytes region will do the job
8:45
now just like previous video we will
8:48
make this region as non-cachable
8:55
so select that x 1 commit all access
8:58
and set up the shareable non cacheable
9:00
region
9:05
that's it for the mpu configuration
9:08
the other configuration is for qspi
9:11
and you don't need to worry about that
9:13
right now
9:29
now we need to add the sections in the
9:31
flash script
9:34
here i have added them starting with dma
9:37
descriptors
9:38
and then the buffers the memories are
9:41
spaced as per the size requirement for
9:43
each section
9:55
but the objects will not relocate just
9:57
yet because they are not linked to those
9:59
sections we defined so we need to link
10:03
them ourselves
10:09
everything i am doing now has been
10:12
covered in the memory configuration
10:14
video
10:15
so if you don't understand this watch
10:17
them first
10:19
this will be our section and we will
10:21
link it to the dmarx descriptor
10:30
similarly we need to link others also
10:42
now comment out this part and build the
10:45
code
10:56
note here the locations for the tx
10:59
descriptor and buffer has been shifted
11:01
to sram 1.
11:03
so we are good to go let's write our
11:06
basic code
11:07
just like we did in the previous video
11:24
let's debug it and check if we have any
11:27
memory issue
11:39
it hit the break point so everything is
11:42
working fine
11:44
now we will let it run freely and ping
11:46
to this address
11:54
so it's working perfectly
11:59
one last thing i wanted to show you here
12:03
remember when i said the buffers and
12:05
descriptors are placed in the tcm ram
12:07
so they don't need the mpu or any memory
12:10
configuration
12:12
let's comment out this part now the
12:15
descriptors are placed in their default
12:17
location
12:18
and we can check it in the memory
12:22
details
12:27
you can see the location here it's in
12:29
the d t
12:30
c m ram region
12:34
also remember that m p u is not
12:36
configured for dtcm
12:38
we have configured it only for the sram
12:40
1.
12:42
so this is basically the default setup
12:44
with no modifications for the memory
12:47
let me comment out this part also just
12:50
for the satisfaction
12:59
let's debug this
13:12
so we hit the break point means
13:14
everything is ok
13:16
and if we ping the address we do get the
13:19
response
13:20
so this was the configuration for the
13:22
ethernet
13:24
i know for some of you this will be as
13:26
simple as the default setup
13:28
and for the rest it could get very
13:30
complicated
13:32
that's why i have covered every possible
13:34
scenario
13:36
every complicated thing shown in the
13:38
video have already been explained in the
13:40
previous videos
13:42
watch the cortex m7 series videos from
13:45
the beginning
13:46
and you will understand everything the
13:49
next video on ethernet will cover the
13:51
udp protocol
13:53
this is it for today you can download
13:56
the code from the link in the
13:58
description
13:59
keep watching be safe and have a nice
14:02
day ahead
14:23
you
#Internet & Telecom
#Networking