https://www.sparkfun.com/tutorials/215
in the end i went with this for the router, using an IMD2A for the two transistors.
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.
You don't generally find a computer with a RS232 port today (except mine), so you anyway need some USB dongle, and then you can just as well use a "TTL" USB serial dongle with suitable voltage.
Regards Henrik
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.
l.
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
On Tue, Nov 19, 2013 at 12:50 PM, mike.valk@gmail.com mike.valk@gmail.com wrote:
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.
USB-to-TTL.... ah, because that would take out one of the 4 USB ports. in this "product" there's only 1 4-port hub.
l.
2013/11/19 luke.leighton luke.leighton@gmail.com
On Tue, Nov 19, 2013 at 12:50 PM, mike.valk@gmail.com mike.valk@gmail.com wrote:
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.
USB-to-TTL.... ah, because that would take out one of the 4 USB ports. in this "product" there's only 1 4-port hub.
No, not on the hub. As as separate usb "slave" port.
USB Host Port-1 -\ USB Host Port-2 -\ |----HUB----[USB-Host SoC UART]--[TTL-USB Slave (USB Serial debug)]--[USB Slave]---[USB-Host/OTG]--[PC,Tablet,etc.] USB Host Port-3 -/ USB Host Port-4 -/
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
On Tue, Nov 19, 2013 at 3:41 PM, mike.valk@gmail.com mike.valk@gmail.com wrote:
2013/11/19 luke.leighton luke.leighton@gmail.com
On Tue, Nov 19, 2013 at 12:50 PM, mike.valk@gmail.com mike.valk@gmail.com wrote:
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.
USB-to-TTL.... ah, because that would take out one of the 4 USB ports. in this "product" there's only 1 4-port hub.
No, not on the hub. As as separate usb "slave" port.
ok so free-standing effectively. so the BOM comparison would be a USB port (slave. B is it? like those you find on printers) plus USB-to-serial converter IC vs a-bit-of-logic plus an RS232 DB9. and it would save a hell of a lot of board space - DB9s are big.
hmm... it has merit.
l.
arm-netbook@lists.phcomp.co.uk
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