AVR-Chat

I seem to have SPI communication problems, my guess is the 
hardware/register setup.  Can anyone offer suggestions??  

I seem to drop bits.  I am sending the byte 0x1c (00011100),  on the 
receive I get 0x0e ( 00001110 ) occasionally, and its completely 
random in occurance.

I have set up counters on the slave device, on some tests I will get 
> 50 million bytes sent before errors occur, on some runs < 1000 
before errors, once errors occur they continue to happen more 
frequent.

I do not believe there is any software related issues, all ISR's are 
only a couple of lines long, and my spi freq 115.2khz ( 14.7456 mhz 
clock) 

My hardware setup is a self made protoboard, plenty of 5v clean 
power, 10k pullups on the 3 spi lines, ss line tied to gnd.  LCD 
telling me what is happening in the processor.
I only have the two processors, supporting  r's and c's and an LCD.  

I question the register setup and data direction, and internal pullup 
usage.  What is the correct configuration of each?

I hope someone can help, I'm a little lost here.

Thanks in Advance -

Ray





CodeVision compiler used, here is my setup configurations:

slave device:

PORTB=0x52; // State0=0 State1=P State2=0 State3=0 State4=1 State5=0 
State6=P State7=0         ORIGINAL SET SORT OF WORKS
DDRB=0xBD; // Func0=Out Func1=In Func2=Out Func3=Out Func4=Out 
Func5=Out Func6=In Func7=Out 


// SPI initialization
// SPI Type: Slave
// SPI Clock Rate: 115.200 kHz
// SPI Clock Phase: Cycle Half
// SPI Clock Polarity: Low
// SPI Data Order: MSB First
SPCR=0xC2;




SPDR = 0x00;// an initial setting
#asm
    in   r30,spsr
    in   r30,spdr
#endasm 


interrupt [SPI_STC] void SPI_Recv_ISR(void)
{ 

unsigned char chardata;  

 chardata = SPDR;
 SPDR = 0;
 if(chardata != 28)
 {
   if(++ErrorCount == 0)            // sent to display
   {
    ++erroverflow;                  //  sent to display
   }

 }

 if(++BytesReceived == 0) 
 {
   if(++BytesRecvOverflow == 0)        //  sent to display
   {
     ++Overflow2;                      //  sent to display
   }
 }




Master Device:

#include <spi.h>

PORTB=0x40; // State0=T State1=T State2=T State3=T State4=0 State5=0 
State6=P State7=0
DDRB=0xB0; //  Func0=In Func1=In Func2=In Func3=In Func4=Out 
Func5=Out Func6=In Func7=Out

// SPI Type: Master  Clock Rate: 115.200 kHz  Clock Phase: Cycle Half 
Polarity: Low   Data Order: MSB First
SPCR=0x53;
SPSR=0x00;  

void main(void)
{ 
  while(1)
  { 
    spi(28);           
  };
}