Re: IsThere a chip with multiple (4 or 8?) serial ports??
- From: Mike Harrison <mike@xxxxxxxxxxxxxxx>
- Date: Thu, 05 Jul 2007 08:20:38 GMT
On Wed, 04 Jul 2007 18:47:38 -0700, "terry@xxxxxxxxxxxx" <terry@xxxxxxxxxxxx> wrote:
I need to build devices for a Marine application that will receive
multiple (4 or 8) serial signals. Typically the signals are 4800 baud,
N,8,1 with a burst length of up to 80 characters, and a repetition
rate of 1 to 2 per second. (These are NMEA signals). They are
uncoordinated signals from individual devices such as GPS receivers,
Engine monitoring instruments etc...
I'm looking for a chip with multiple serial ports (actually receive -
only would be OK here). I want to interface such a chip or chips to a
PIC which will do a small amount of supervision, possibly filtering,
and use it's main hardware UART or USB or a CAN controller to output
data to a computer.
I've searched thru MicroChip and some on Google etc. What I'd LIKE is
a serial-port chip designed to interface to a microcontroller by SPI,
serial, I2C etc. AND which has 4 to 8 serial ports.
Anyone seen such a beastie?? Any other suggestions other than many
single-channel USARTs (Ughh..)
Thanks!
Maxim do a SPI uart chip but rather expensive.
You can do it in software reasonably easily - 4800 baud is not especially taxing - you just need to
sample an 8-bit input port at 3x the baud rate on a timer interrupt and then process each bit in
turn.
In the past I've implemented 16 channels at 9600 baud on an ATMEGA88, so 8x4800 shouldn't be too
hard.
.
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- IsThere a chip with multiple (4 or 8?) serial ports??
- From: terry@xxxxxxxxxxxx
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