PIC 18F family - Actual use of WCOL flag (SSPCON1,7)

[atferrari]

SPI - micro has to transmit only.

I couldn't find a good (practical) use for the WCOL flag (Write collision detect bit).

The way I understand it, I should first write to SSPBUF and then check that flag to see if I was allowed to write. Kind of: "do it and I will tell you if you did right or wrong".

I expected to have a "busy" flag, pretty much like the one in the classic LCD displays that when it is cleared, you know you can go ahead with the next byte.

Is my interpretation wrong?

 

[languer]

If your send routine sort of looks like this:

Proc spi_send(spi_data As Byte)
	While SSPSTAT.BF = 0
	Wend  'Wait until buffer is clear
	SSPBUF = spi_data
End Proc

then and you're only sending/transmitting, there is little chance the WCOL bit will ever be set. The WCOL will be set if the Buffer is full and you attempt to write to it before it's emptied.

 

[atferrari]

Thanks for replying