3 serial ports with only 1 pic - Electronic Circuits Projects Diagrams Free

Algerian · 30th June 2007, 10:09 AM

Hello, I want to ask help
Does anybody know how to do to use 3 serial ports with only 1 pic16f877,
I want to use 1 serial port rs232 to communicat with PC and 2 others to communicat with Barometer, and Thermometer.
Thanks in advance for any help or advice you might provid.

**Nigel Goodwin** · 30th June 2007, 10:21 AM

Simply use two software UART's, and one hardware one.

Algerian · 30th June 2007, 10:32 AM

Thanks for reply, but could you give me more explication please.
I can't enter the site you gave me.

**Nigel Goodwin** · 30th June 2007, 10:40 AM

Quote:

Originally Posted by Algerian

Thanks for reply, but could you give me more explication please.
I can't enter the site you gave me.

I would use software UARTS for receiving the data, and the hardware UART for sending it to the PC - both are covered in my tutorials - just checked it, the site is working fine.

Pommie · 30th June 2007, 10:57 AM

The only problem with the serial routines on Nigel's page is that they can't send and receive at the same time.

In this thread I posted code that allows 8 channel RS232 to run simultaneously.

Mike.

Papabravo · 30th June 2007, 01:14 PM

If your PIC has an SPI peripheral you could use a pair of MAX-3100 UARTS. It is a very capable chip, with an excellent datasheet. One nice feature is that they have receive FIFOs which are 8 bytes deep so you don't have to service them each time a character comes in but can do it in bursts.

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30th June 2007, 10:09 AM	(permalink)
Algerian	3 serial ports with only 1 pic Hello, I want to ask help Does anybody know how to do to use 3 serial ports with only 1 pic16f877, I want to use 1 serial port rs232 to communicat with PC and 2 others to communicat with Barometer, and Thermometer. Thanks in advance for any help or advice you might provid.

30th June 2007, 10:21 AM	(permalink)
Nigel Goodwin	Simply use two software UART's, and one hardware one. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

30th June 2007, 10:32 AM	(permalink)
Algerian	Thanks for reply, but could you give me more explication please. I can't enter the site you gave me.

30th June 2007, 10:57 AM	(permalink)
Pommie	The only problem with the serial routines on Nigel's page is that they can't send and receive at the same time. In this thread I posted code that allows 8 channel RS232 to run simultaneously. Mike.

30th June 2007, 01:14 PM	(permalink)
Papabravo	If your PIC has an SPI peripheral you could use a pair of MAX-3100 UARTS. It is a very capable chip, with an excellent datasheet. One nice feature is that they have receive FIFOs which are 8 bytes deep so you don't have to service them each time a character comes in but can do it in bursts.