//! Set up the pins for SPI mode.
-unsigned char spisetup(){
+void spisetup(){
P5DIR|=MOSI+SCK+SS;
P5DIR&=~MISO;
P5OUT|=SS;
//This function came from the SPI Wikipedia article.
//Minor alterations.
- P5OUT&=~SS;
-
for (bit = 0; bit < 8; bit++) {
/* write MOSI on trailing edge of previous clock */
if (byte & 0x80)
CLRCLK;
}
- P5OUT|=SS;
-
return byte;
}
void spihandle(unsigned char app,
unsigned char verb,
unsigned char len){
+ unsigned char i;
switch(verb){
//PEEK and POKE might come later.
case READ:
case WRITE:
- cmddata[0]=spitrans8(cmddata[0]);
- txdata(app,verb,1);
+ P5OUT&=~SS; //Drop !SS to begin transaction.
+ for(i=0;i<len;i++)
+ cmddata[i]=spitrans8(cmddata[i]);
+ P5OUT|=SS; //Raise !SS to end transaction.
+ txdata(app,verb,len);
break;
case SETUP:
spisetup();