1 May
2012
1 May
'12
10:11 a.m.
Chuck Guzis wrote:
On 1 May 2012 at 17:54, Holm Tiffe wrote:
Not only that, I think there are some opensource libs that make
an USB device out of a plain Atmega w/o some hardware USB Support like
on chip devices or FTDI and I have 90% of the flash ROM left over free.
(It's because of Atmels politics to not making Devices with enough RAM in
them, you get more Flash than you need and only 4 Kbytes of RAM)
I'm simply don't need USB in that class of Hardware.
But there is another Problem raising in the meantime, I should change the
Motherboard from my PeeCee this year I think. There are some Capacitors
on the Voltage converters blowing up AGAIN and performance wise it isn't
that good anymore altough it is running with FreeBSD 365 day/year.
I have to buy somehing next time that don't has the features I want.
(Have an PCI COM Card additionally to the onbord COM ports in there already).
But this changes nothing about that what I think cwabout the Promer interface.
Regards,
Holm
--
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...simple or not, I for my self think that
classic interfaces are
better fit MY needs. I've finished to build an Programmer for CY7C291
and Am27C291 Chips yesterday and it has a simple AtMega644P CPU on it.
This way I have enough RAM to buffer the ROM contents + some extra for
the Program on the device. Could have build it with an FTDI in it, but
what for?
I understand. Even when working with MCUs with native USB support
built-in, I'll dedicate some pins to driving a MAX232 for RS-232
serial interface for debugging, even though it may be feeding a RS232-
to-USB adapter. It's just that 232 is simple and less prone to
coding errors. I suppose that I could go to USB using one of the
FTDI, but it's really a wash.
--Chuck