At 08:05 AM 11/28/02 +0000, you wrote:

>The SSPIF bit is set when the byte in SSPBUF has been transmitted, but there
>is no requirement for this to fire an interrupt.  You can simply mask off
>the MSSP interrupt (SSPIE = 0) and poll the SSPIF bit in a loop.
>
>If you really want to use interrupts, then you will have to make some
>arrangement so the ISR knows how many bytes it needs to send.  When sending
>data on the SPI, set a counter holding the number of bytes to send.  After
>sending each byte, the counter can be decremented in the ISR until it is
>zero.

IMO, there's little reason to use interrupts with an SPI master running at
high speed, the cycles after a transfer is initiated are both few
in number and fixed.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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