1. Buffer command byte
2. Buffer data byte
3. send a extra byte for "end of message" i.e. 0x0A
4. when 0x0A is received, handle buffer.

Augusto

----- Original Message -----
From: "thomasn101" <thomasn101@HOTMAIL.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, December 17, 2002 6:23 AM
Subject: [PIC]: SPI Protocol


> Hi Everyone,
>
> I am stuck and I need your help!  I have 2 PIC16F877 Micros.  They are
> communicating with each other through SPI (One master and one slave).
> The Master sends 2 bytes of data to the Slave - one is the "command"
> byte and one is the "data" byte.  The Master IC always sends out the
> "command" byte first follows by a "data" byte. The Slave IC gets
> interrupted every time the SPI reception is completed.
>
> Here is my question:  How do I write the code so that the Slave knows
> which byte is the "command" byte and which byte is a "data" byte?
>
> Thank you in advance.
> Regards,
> Thomas
>
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