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PIC16F877 SPI and I2C at the same time possible?

 
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djpark



Joined: 02 Mar 2004
Posts: 49

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PIC16F877 SPI and I2C at the same time possible?
PostPosted: Sat Mar 27, 2004 9:14 am     Reply with quote
I have an application using 16F877 with both I2C component and another PIC on SPI. Both functions are multiplexed on the same pins.

pin/SPI/I2C
RC3/SCK/SCL
RC4/SDI/SDA
RC5/SDO

Is it possible (electronically) to connect both on the same pin and communicate individually (of course one at a time)?

The reason for SPI to another PIC is that 16F877 UART is connected to modem. Besides using a software async to communicate with the second PIC, is there a better way?

Thanks in advance.

-- DJP
Jos



Joined: 15 Sep 2003
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PostPosted: Sat Mar 27, 2004 11:47 am     Reply with quote
Why not use a software SPI-function in your program? It work's fine for me!

Jos
djpark



Joined: 02 Mar 2004
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PostPosted: Sat Mar 27, 2004 12:56 pm     Reply with quote
Jos wrote:
Why not use a software SPI-function in your program? It work's fine for me!

Jos


Thanks for the suggestion.

Do you mean s/w-SPI on the master PIC to communicate with slave PIC?

How stable is it? Is there a sample from CCS or example to point to?

Thanks.

-- DJP
Neutone



Joined: 08 Sep 2003
Posts: 839
Location: Houston

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PostPosted: Sat Mar 27, 2004 1:38 pm     Reply with quote
You can dynamicaly reconfigure the port. I don't know what problems you will have but it can be multiplexed.
Haplo



Joined: 06 Sep 2003
Posts: 659
Location: Sydney, Australia

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PostPosted: Sat Mar 27, 2004 5:32 pm     Reply with quote
This may be helpful:
http://www.ccsinfo.com/forum/viewtopic.php?t=18731&highlight=
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