[chbot] Looking for a micro

[Charles Manning]

Thanks Blokes

For me the STM32F0x2s are still winning over other STM32F070 because they
don't need a crystal - even for USB.

I see that the Kinetis devices from NXP seem to support crystal-less USB
too. Anybody played with those?

Michael: the ATSAMD21E15A/B don't seem to have USB.

Any more candidates?

Thanks

Charles


On Mon, Jan 8, 2018 at 10:35 AM, Michael Hope <michaelh at juju.net.nz> wrote:

> I'm enjoying porting Zephyr to the SAMD series that's also used in the
> Arduino Zero.
>
> If I've read it right, the ATSAMD21E15A with 32 k flash is 0.48 / 100 at
> Digikey.
>
> On Sun, 7 Jan 2018, 20:39 Charles Manning, <cdhmanning at gmail.com> wrote:
>
>> Happy New Year y'all!
>>
>> A new year, a new project.
>>
>> I need a supervisory micro for an FPGA-based system. It needs to be:
>> * Low cost (sub $1US @10k).
>> * USB device + UART. It will make a CDC class "virtual comm port".
>> * Low cost (sub $1US @10k).
>> * A few GPIOs for LEDs + switch + controlling main power supply to turn
>> on FPGA.
>> * Low cost (sub $1US @10k).
>>
>> Other engineering driven requirements:
>> * ARM Cortex M0/3. Life's too short to mess about with esoteric tool
>> chains and instruction sets.
>> * Small  footprint.
>>
>> So far my eye is drawn to the STM32F042 which is all of these and it
>> seems does not need a crystal making for even more cost + board space
>> saving.
>>
>> Anybody got other options?
>>
>> Thanks
>>
>> Charles
>>
>>
>>
>>
>>
>>
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