DVP3 spi Bug

[sjo]

Posted on January 25, 2006 at 06:49

DVP3 spi Bug

[sjo]

Posted on January 25, 2006 at 06:49

Hi,

Found really strange one with the DVP3 emulating a ST72F264 spi.

If i set the spi clock mode as below it works ok

SPISR = 0b00000011;

SPICR = 0b01111100; // CPOL=1, CPHA=1

If i change the clock mode to CPOL=0, CPHA=0 it gets stuck waiting for the SPIF bit to set.

SPISR = 0b00000011;

SPICR = 0b01110000;

I have tried using the MISCR2 instead but that does made no differance.

The same code works ok if using an indart on an actual device.

As a further test i used an old DVP2 setup as a 254 all the modes tried worked ok.

The code has been used on many st7 applications and like i mentioned above works on the actual silicon.

this is my spi send routine

BYTE SendSPI(BYTE uData)

{

SPIDR = uData;

do {

// check for write collision

if( ValBit( SPISR, WCOL ))

{

_asm(''tnz _SPISR'');

_asm(''tnz _SPIDR'');

SPIDR = uData;

}

} while(!ValBit( SPISR, SPIF ));

return SPIDR;

}

Is this a DVP3 bug ?

Spen