STM CircleOS forum / CAN and USB at same time?

sima · 2008-12-18 22:28:11

Hello

I have not yet read deeply about the STM32. But I heard today that it is not possible to use USB and CAN at the same time!?!? Is that true?

lou · 2008-12-18 23:00:16

sima :
I have not yet read deeply about the STM32. But I heard today that it is not possible to use USB and CAN at the same time!?!? Is that true?

The datasheet says this:
"The USB and CAN share a dedicated 512-byte SRAM memory for data transmission and
reception, and so they cannot be used concurrently (the shared SRAM is accessed through
CAN and USB exclusively). The USB and CAN can be used in the same application but not
at the same time."

Kind of makes it hard to make a USB <-> CAN gateway. You'd need a different chip for that.

sima · 2008-12-19 06:22:31

Why this illogical compromise?

Are there other ARM Cortex M3 MCUs available that supports simultaneous CAN and USB?

lou · 2008-12-20 15:59:57

sima :
Why this illogical compromise?

I don't know. That's just what the datasheet says.

sima :
Are there other ARM Cortex M3 MCUs available that supports simultaneous CAN and USB?

It is likely. You're on your own for that research, but you could start by looking at every vendor that has Cortex M3 products. It's a short list, but promises to get longer as more adopt.

Francis · 2008-12-20 17:21:12

Don't know if it is acceptable, but note that the data sheet says:
"The USB and CAN can be used in the same application but not at the same time."

ben · 2008-12-20 20:24:42

Hi all,

Read this FAQ from ST : http://www.st.com/stonline/faq/faqview.php?ids=1228

Regards,

Ben,

gedass · 2009-02-10 20:17:32

sima :
Hello

I have not yet read deeply about the STM32. But I heard today that it is not possible to use USB and CAN at the same time!?!? Is that true?

STM32F105 will have possibility to use USB and CAN at same time.
STR750 has this posibility.I had a similar project some time ago: www.edevices.lt

Last edited by gedass (2009-02-23 19:29:49)

sima · 2009-02-11 09:43:38

That is good news :-)

# 1 2008-12-18 22:28:11 CAN and USB at same time?

CAN and USB at same time?

# 2 2008-12-18 23:00:16 CAN and USB at same time?

Re: CAN and USB at same time?

sima :

# 3 2008-12-19 06:22:31 CAN and USB at same time?

Re: CAN and USB at same time?

# 4 2008-12-20 15:59:57 CAN and USB at same time?

Re: CAN and USB at same time?

sima :

sima :

# 5 2008-12-20 17:21:12 CAN and USB at same time?

Re: CAN and USB at same time?

# 6 2008-12-20 20:24:42 CAN and USB at same time?

Re: CAN and USB at same time?

# 7 2009-02-10 20:17:32 CAN and USB at same time?

Re: CAN and USB at same time?

sima :

# 8 2009-02-11 09:43:38 CAN and USB at same time?

Re: CAN and USB at same time?

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