I’ve only just recently spotted the issue. I was looking at what it would take
to put together a USB to CAN converter. The F103 USB peripheral shares a buffer
with the CAN peripheral. I’m not sure if both CAN and USB can be used at the
same time in this variant.
The F105/7 USB peripheral is on a different clock/bus completely, has OTG, and
there are two CAN peripherals.
So the F105 was the part I was considering.
I saw a Chinese converter based on a F103:
https://www.aliexpress.com/item/Free-shipping-CAN-Bus-Analyzer-USB-to-CAN-USB-CAN-debugger-adapter-communication-converter/32489958299.html
I wondered how they did it, then spotted the CP2102 USB to serial converter.
They don’t use the F103 USB at all!
Does anyone know if anyone has developed a USB-CAN converter using libopencm3?
I’ve used a mictronics.de USB<>CAN (supported by linux SocketCAN), but a CM3
version should result in a good reduction in parts count, and possibly dual CAN
channels...
Edward
> On 12/03/2017, at 2:16 PM, Warren Gay <ve3...@gmail.com> wrote:
>
> On Sat, Mar 11, 2017 at 5:39 PM, Edward Cheeseman <cheesemanedw...@gmail.com
> <mailto:cheesemanedw...@gmail.com>> wrote:
> Stm32f103 has a different USB peripheral to the f105/f107. So you need to
> find the f103 implementation. I believe the Black Magic Debug Probe uses both
> USB and f103, so would be a good place to start.
>
> The USB peripheral is described in the same RM0008 for the 103, as the
> 105/107. However, as you pointed out, there are differences. Ug. The driver I
> was attempting to use assumes OTG support which is absent in the 103.
>
> So clearly, using this driver on the 103 is barking up the wrong tree. Thanks
> for highlighting that issue.
>
> Warren
>
>
> On 12/03/2017, at 11:12 AM, Warren Gay <ve3...@gmail.com
> <mailto:ve3...@gmail.com>> wrote:
>
>> I have been trying to get a usb cdc example app up and running on the
>> stm32f103. My attempt has been adapted from the example at:
>>
>>
>> https://github.com/libopencm3/libopencm3-examples/blob/master/examples/stm32/f3/stm32f3-discovery/usb_cdcacm/cdcacm.c
>>
>> <https://github.com/libopencm3/libopencm3-examples/blob/master/examples/stm32/f3/stm32f3-discovery/usb_cdcacm/cdcacm.c>
>
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Edward Cheeseman
Electrical Engineer
cheesemanedw...@gmail.com
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