[Arm-netbook] stm32f072 usb firmware

[Luke Kenneth Casson Leighton]

hi peter, et al,

i managed to find a variant of libopencm3 which has usb support for
the stm32f072, i compiled the cdcacm example and it worked. i will
write up some notes later but here's a start:

https://github.com/kuldeepdhaka/libopencm3/tree/usb-rewrite
https://github.com/kuldeepdhaka/libopencm3-examples/tree/usb-rewrite
http://hands.com/~lkcl/usb_req_done.patch

peter i sent phil the ssh key, please do consider joining the mailing
list so that things can be coordinated without cc.

the above branch is... well... it's literally one of the first times
that libopencm3 has run usb code on an stm32f072 nucleo board. it
means that certain things aren't going to be there. with two of us,
peter, doing testing and development, the libopencm3 team on
irc.freenode.net will have the encouragement they need to move things
forward: we are, however, going to have to help them out, they're
pretty busy.

the similarity to the stm32f1 series is sufficiently strong that i
have confidence in their work, which means we can both press ahead
with firmware development whilst the usb code is moved mainline and
stabilised with unit testing.

l.

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[Peter Bouda]

Post by Luke Kenneth Casson Leighton
hi peter, et al,
i managed to find a variant of libopencm3 which has usb support for
the stm32f072, i compiled the cdcacm example and it worked. i will
https://github.com/kuldeepdhaka/libopencm3/tree/usb-rewrite
https://github.com/kuldeepdhaka/libopencm3-examples/tree/usb-rewrite
http://hands.com/~lkcl/usb_req_done.patch
peter i sent phil the ssh key, please do consider joining the mailing
list so that things can be coordinated without cc.
the above branch is... well... it's literally one of the first times
that libopencm3 has run usb code on an stm32f072 nucleo board. it
means that certain things aren't going to be there. with two of us,
peter, doing testing and development, the libopencm3 team on
irc.freenode.net will have the encouragement they need to move things
forward: we are, however, going to have to help them out, they're
pretty busy.
the similarity to the stm32f1 series is sufficiently strong that i
have confidence in their work, which means we can both press ahead
with firmware development whilst the usb code is moved mainline and
stabilised with unit testing.
l.

hi,

my new nucleo board arrived this week (yeah!) and I will now setup my
dev environment and see if I can get the code running. Is there any
specific thing I could test?

Best,
Peter


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[Luke Kenneth Casson Leighton]

hi,
my new nucleo board arrived this week (yeah!) and I will now setup my dev
environment

you don't need that patch btw. and apparently there's now usb
support in the main branch for stm32f072

and see if I can get the code running. Is there any specific
thing I could test?

the main thing is to get the miniblink example up and running, first.
i use dfu-util with the following in the Makefile:

BINARY = usbhid

dfu:
dfu-util -v -S FFFFFFFEFFFF -a 0 --dfuse-address 0x08000000 -R
-D ./$(BINARY).bin


keep the little piece of card, you need it! it has the pin-out
assignments. so forget powering by the micro-usb, do this:

* flip the jumper from E5V to U5V
* cut off a random USB cable and strip down the black, red, white and green
* solder 5V (Red) to pin 6 of CN7
* solder GND (black) to pin 8 of CN7
* solder USB+ (green) to pin 12 (PA12) of CN10
* solder USB- (white) to pin 14 (PA11) of CN10

then, plug it into a USB port of the development machine. then, use a
screwdriver to short BOOT0 (pin 7 of CN7) to E5V (pin 6 of CN7), and
at the same time press and then release the reset button (B2).

if you then do "lsusb" you should see a device come up "DFU mode" in
the description. ta-daa, you can now upload a .bin file to it. you
do that with any of the libopencm3-examples, you must do "make bin".

you don't need to modify any of kuldeep's examples, he's made a
suitable stm32f072-discovery.ld file, so you might prefer initially to
use kuldeep's branch.

l.

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[Peter Bouda]

Post by Luke Kenneth Casson Leighton
keep the little piece of card, you need it! it has the pin-out
* flip the jumper from E5V to U5V
* cut off a random USB cable and strip down the black, red, white and green
* solder 5V (Red) to pin 6 of CN7
* solder GND (black) to pin 8 of CN7
* solder USB+ (green) to pin 12 (PA12) of CN10
* solder USB- (white) to pin 14 (PA11) of CN10
then, plug it into a USB port of the development machine. then, use a
screwdriver to short BOOT0 (pin 7 of CN7) to E5V (pin 6 of CN7), and
at the same time press and then release the reset button (B2).
if you then do "lsusb" you should see a device come up "DFU mode" in
the description. ta-daa, you can now upload a .bin file to it. you
do that with any of the libopencm3-examples, you must do "make bin".

hm, that did not work, unfortunately, I cannot get into the DFU mode
somehow. It will just start into the mode that is described in the Quick
start section of the manual. I found some forum posts where people
suggest to solder resistors to PA11 and PA12... but that should not
alter the start mode, right? Any ideas what I could have done wrong?

Best,
Peter


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[Luke Kenneth Casson Leighton]

Post by Peter Bouda

Post by Luke Kenneth Casson Leighton
keep the little piece of card, you need it! it has the pin-out
* flip the jumper from E5V to U5V
* cut off a random USB cable and strip down the black, red, white and green
* solder 5V (Red) to pin 6 of CN7
* solder GND (black) to pin 8 of CN7
* solder USB+ (green) to pin 12 (PA12) of CN10
* solder USB- (white) to pin 14 (PA11) of CN10
then, plug it into a USB port of the development machine. then, use a
screwdriver to short BOOT0 (pin 7 of CN7) to E5V (pin 6 of CN7), and
at the same time press and then release the reset button (B2).
if you then do "lsusb" you should see a device come up "DFU mode" in
the description. ta-daa, you can now upload a .bin file to it. you
do that with any of the libopencm3-examples, you must do "make bin".

hm, that did not work, unfortunately, I cannot get into the DFU mode
somehow. It will just start into the mode that is described in the Quick
start section of the manual. I found some forum posts where people suggest
to solder resistors to PA11 and PA12... but that should not alter the start
mode, right?

that's for very older STM32F devices, where they did not have the
resistors built-in. occasionally you might need 22R resistors to stop
signals bouncing back-and-forth with incorrect impedance, but you
shouldn't.

Post by Peter Bouda
Any ideas what I could have done wrong?

it's not amazingly hard, this, there's not actually a lot to do, so
the number of things wrong will be very small.

can you take a picture and make it available online, also compare
against the photo here:
http://rhombus-tech.net/community_ideas/laptop_15in/news/PCB2_prototype_progress_14oct2015/

btw if you haven't re-flashed the firmware at all, then by default it
will come up with LD2 blinking happily. check first that that's what
happens by returning the U5V jumper and plugging in a mini-usb cable.

btw you should *NOT* plug in a mini-usb cable at the same time as the
USB cable across PA12 and PA11!

also make sure BOOT0 is shorted to E5V *before* pressing reset, then
hold reset for at least 0.5 seconds, *then* release reset, then
release BOOT0 screwdriver-short.

l.

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[Peter Bouda]

Post by Luke Kenneth Casson Leighton
btw if you haven't re-flashed the firmware at all, then by default it
will come up with LD2 blinking happily. check first that that's what
happens by returning the U5V jumper and plugging in a mini-usb cable.

Yes, that's what's happening. Maybe I missed sth, do I have to reflash
before I do anything else?

Best,
Peter

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[Peter Bouda]

Post by Luke Kenneth Casson Leighton

Post by Peter Bouda
Any ideas what I could have done wrong?

it's not amazingly hard, this, there's not actually a lot to do, so
the number of things wrong will be very small.
can you take a picture and make it available online, also compare
http://rhombus-tech.net/community_ideas/laptop_15in/news/PCB2_prototype_progress_14oct2015/
btw if you haven't re-flashed the firmware at all, then by default it
will come up with LD2 blinking happily. check first that that's what
happens by returning the U5V jumper and plugging in a mini-usb cable.
btw you should *NOT* plug in a mini-usb cable at the same time as the
USB cable across PA12 and PA11!
also make sure BOOT0 is shorted to E5V *before* pressing reset, then
hold reset for at least 0.5 seconds, *then* release reset, then
release BOOT0 screwdriver-short.

hey, I got it finally. I think I made something wrong with the
screwdriver (noob!), but after some more attempts it worked and I got
the miniblink working. I will go on with the usb-rewrite stuff now, and
see how it works.

Peter

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[Luke Kenneth Casson Leighton]

Post by Luke Kenneth Casson Leighton

Post by Peter Bouda
Any ideas what I could have done wrong?

it's not amazingly hard, this, there's not actually a lot to do, so
the number of things wrong will be very small.
can you take a picture and make it available online, also compare
http://rhombus-tech.net/community_ideas/laptop_15in/news/PCB2_prototype_progress_14oct2015/
btw if you haven't re-flashed the firmware at all, then by default it
will come up with LD2 blinking happily. check first that that's what
happens by returning the U5V jumper and plugging in a mini-usb cable.
btw you should *NOT* plug in a mini-usb cable at the same time as the
USB cable across PA12 and PA11!
also make sure BOOT0 is shorted to E5V *before* pressing reset, then
hold reset for at least 0.5 seconds, *then* release reset, then
release BOOT0 screwdriver-short.

hey, I got it finally. I think I made something wrong with the screwdriver
(noob!), but after some more attempts it worked and I got the miniblink
working.

yaaaa sounds familiar :)

I will go on with the usb-rewrite stuff now, and see how it works.

you should actually be able to use libopencm3 master, now, because
some usb commits for stm32f072 were made last week.

l.

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