Re: Need low-cost serial interface
- From: Anton Erasmus <nobody@xxxxxxxxxxxxxxxx>
- Date: Wed, 15 Feb 2006 23:15:08 +0200
On Wed, 15 Feb 2006 00:51:20 +0100, "Ulf Samuelsson"
<ulf@xxxxxxxxxxxxx> wrote:
CBodd wrote:
This is a currently-shipping product, based on a Samsung ARM7 chip
(the nomenclature of the silicon has changed 3x since we've been
using it in '99 -- something like S3C341x or whatever.... my databook
is in the lab right now...)
The ARM is running at 20 MHz and is at 80-85% CPU utilization (using
uC/OS-II, the CPU pct loading is an optional feature that can be
enabled, i.e. I'm pulling the figure out of my you-know-what)
If you add an ATmega162 to the SPI bus you can let it bridge to the two
UARTs.
The GSM 07.10 protocol will let you multiplex two UART channels on the SPI
bus.
Do you perhaps have a link where I can get details on the GSM 07.20
protocol.
Since I used an ATMega162 for this exact application, I agree that it
is a good solution. The ATMega162 has absolutely no problem in
handling 2x full duplex channels at 115200 baud, and using the SPI
channel to multiplex the data.
Regards
Anton Erasmus
.
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