2013/11/16 luke.leighton luke.leighton@gmail.com
On Sat, Nov 16, 2013 at 8:22 PM, Henrik Nordström henrik@henriknordstrom.net wrote:
lör 2013-11-16 klockan 13:23 +0000 skrev luke.leighton:
https://www.sparkfun.com/tutorials/215
in the end i went with this for the router, using an IMD2A for the two transistors.
Personally I haven't used RS232 in ages, only different "TTL" serial variants of 5V or 3.3V.
yehh i have to be reaasonably compatible with RS232, as this is actually going to have a 9-pin header on it. although the only thing it will be connected to in most cases is one of those... yup, USB serial converters.
Why don't we include a USB to TTL-Serial chip on the card and/or carrier. Just like Solid_run did/does with their CuBoxes.
Pro's: - nobody need to have a RS-232 or TTL dongle. - we can tune the usb-ttl chip to the SoC/MicroController - No fiddeling with voltage levels outside the both - USB-Interface are everyware - USB has standardized cables - USB ports are fixed. Doesn't get lost in the rubble. - Amateur developers aren't required to invest in additional hardware to get started or helpout.
Con's - Extra space needed - Extra chips / costs - USB-TTL chips sometimes require drivers to operate.
http://www.solid-run.com/mw/index.php/Serial_console
l.
arm-netbook mailing list arm-netbook@lists.phcomp.co.uk http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to arm-netbook@files.phcomp.co.uk