betty/spi.c

   1 /*
   2  * spi.c - serial peripheral interface 0/1
   3  *
   4  * author: hackbard@hackdaworld.org
   5  *
   6  */
   7
   8 #include "spi.h"
   9
  10 /*
  11  * functions
  12  */
  13
  14 void spi1_init(u8 width,u8 type,u8 div) {
  15
  16         if((width<8)|(width>16))
  17                 width=8;
  18         if(width==16)
  19                 width=0;
  20
  21         div&=0xfe;
  22         if(div<8)
  23                 div=8;
  24
  25         S1SPCR=(1<<2)|(width<<8)|(type<<5);
  26         S1SPCCR=div;
  27 }
  28
  29 void spi1_send(u16 data) {
  30
  31         S1SPDR=data;
  32
  33         while(!(S1SPSR&(1<<7)))
  34                 continue;
  35 }