Hi to all,

I got basic spi running now I am having hard time to get odd parity bit  
9-th  bit  working
here is the code any help will appreciate.

void ps2_out(BYTE data)
{
      BYTE i;
      int temp=1,data_copy,count;
      data_copy=data;
      output_low(PS2_CLK_OUT);  // start bit
       delay_us(35);
      for(i=0;i<8;++i)
      {
      output_bit(PS2_DATA_OUT, shift_left(&data,1,0));
      OUTPUT_HIGH(PS2_CLK_OUT); //
      delay_us(35);
      output_low(PS2_CLK_OUT);
      delay_us(35);
      }
      data_copy &= 0x7f; //trim to 7 bit ASCII
      temp^=((data_copy) & 1);
      for (count = 0; count < 8; ++count) {temp ^= ((data_copy >> count) 
& 1);}
      if (temp==0){output_high(PS2_DATA_OUT);} // even
      if (temp==1){output_low(PS2_DATA_OUT);} // odd
      output_high(PS2_CLK_OUT);  // stop bit
      delay_us(200);
     
}


thanks again

Andre
 

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