Posted on January 25, 2006 at 06:49Hi,
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
