[chbot] Looking for a micro

[Charles Manning]

Actually it seems the E does have USB. My bad.


On Mon, Jan 8, 2018 at 11:04 AM, Michael Hope <michaelh at juju.net.nz> wrote:

> Ah, sorry.  The ATSAMD21G15B does but it's $1.07.  It can run at USB full
> speed without a crystal but I haven't tried it.
>
> -- Michael
>
> On Sun, 7 Jan 2018, 22:47 Charles Manning, <cdhmanning at gmail.com> wrote:
>
>> 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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>>
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