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maxrate
Joined: 01 Jan 2007 Posts: 38 Location: Mississauga, Ontario, Canada
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Two serial ports - define in C |
Posted: Mon Oct 13, 2008 4:40 pm |
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Hello, I'm using a 16F877A and I need two serial ports. I'm using the hardware UART to connect with a GSM modem (at 9600 baud), and I would like to establish a software UART (USART) on a different set of pins to receive NEMA GPS data (at 4800 baud). How in C do I define a second RS232 instance and how would I use the printf command? I've been looking thru the forum for about an hour to shed some light on this, but I can't seem to find what I'm looking for (apologies if something like this has already been posted)
Happy Thanksgiving & Columbus Day! |
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dyeatman
Joined: 06 Sep 2003 Posts: 1924 Location: Norman, OK
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PCM programmer
Joined: 06 Sep 2003 Posts: 21708
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maxrate
Joined: 01 Jan 2007 Posts: 38 Location: Mississauga, Ontario, Canada
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Posted: Mon Oct 13, 2008 5:22 pm |
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Thanks for the feedback, that looks like it will do the trick! Subsequent question would be, why doesn't the CCS C compiler reference manual show the 'stream' directive in the book in the #use rs232 section? I feel like I'm missing something.. |
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dyeatman
Joined: 06 Sep 2003 Posts: 1924 Location: Norman, OK
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Posted: Mon Oct 13, 2008 5:37 pm |
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The current manual page 133
Printf/fprintf and the stream parameter is shown on page 203 |
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maxrate
Joined: 01 Jan 2007 Posts: 38 Location: Mississauga, Ontario, Canada
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Posted: Mon Oct 13, 2008 6:06 pm |
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I have two reference manuals, one from Sep 2006 and one from Aug 2007. I'll be upgrading later this year. I found a section called 'How can I use two or more rs-232 ports on one PIC?" - it answers my streaming questions as well. Thanks for all the help everyone! |
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PCM programmer
Joined: 06 Sep 2003 Posts: 21708
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