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Discussion Groups | Piclist | Multiple software USART's

A discussion group for the PICMicro microcontroller. Also called the Microchip PIC, this list is dedicated to the use and abuse of this fine, simple, microcontroller. Close to topic posts are welcome, ie. general electronics.

Multiple software USART's - Milton Medicinteknik KB - Dec 29 13:17:00 2003

Hello all

The best way for a PIC to communicate with a device over RS 232 is to
use a USART equipped PIC. However, if volume is high and the PIC may be
a small one, it is cheaper to use a software USART.

This can be a timer interrupted testing process of a pin, shifting the
result (High/Low) through the status carry bit into a "RecByte"
register.

However - in my case I would like to test 5 pins in such way
(timerinterrupted as other processes are active as well) by
oversampling, and also send RS 232 data over 5 other pins. Thus, the
PIC becomes a "RS 232 hub"; for 9600 Baud.

My question to the group is: has anyone done this already ? Willing to
pay for code already up and running.

Kindly reply directly to Sven in Sweden


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Re: Multiple software USART's - Leon Heller - Dec 29 14:13:00 2003


----- Original Message -----
From: "Milton Medicinteknik KB" <>
To: <>
Sent: Monday, December 29, 2003 6:17 PM
Subject: [piclist] Multiple software USART's > Hello all
>
> The best way for a PIC to communicate with a device over RS 232 is to
> use a USART equipped PIC. However, if volume is high and the PIC may be
> a small one, it is cheaper to use a software USART.
>
> This can be a timer interrupted testing process of a pin, shifting the
> result (High/Low) through the status carry bit into a "RecByte"
> register.
>
> However - in my case I would like to test 5 pins in such way
> (timerinterrupted as other processes are active as well) by
> oversampling, and also send RS 232 data over 5 other pins. Thus, the
> PIC becomes a "RS 232 hub"; for 9600 Baud.
>
> My question to the group is: has anyone done this already ? Willing to
> pay for code already up and running.

I developed a high-speed comms hub a couple of years ago using 2313 AVRs for
the UARTS and a PIC controlling the whole thing. The AVRs were interfaced to
the PIC via SPI. I think it handled four channels at 115k.

Leon
--
Leon Heller, G1HSM
Email:
My low-cost Philips LPC210x ARM development system:
http://www.geocities.com/leon_heller/lpc2104.html





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