1 //GoodFET SPI Application
4 //Higher level left to client application.
20 //This could be more accurate.
21 //Does it ever need to be?
23 #define SPIDELAY(x) delay(x)
25 #define SETMOSI P5OUT|=MOSI
26 #define CLRMOSI P5OUT&=~MOSI
27 #define SETCLK P5OUT|=SCK
28 #define CLRCLK P5OUT&=~SCK
29 #define READMISO (P5IN&MISO?1:0)
33 //! Set up the pins for SPI mode.
34 unsigned char spisetup(){
40 //! Read and write an SPI bit.
41 unsigned char spitrans8(unsigned char byte){
43 //This function came from the SPI Wikipedia article.
48 for (bit = 0; bit < 8; bit++) {
49 /* write MOSI on trailing edge of previous clock */
56 /* half a clock cycle before leading/rising edge */
60 /* half a clock cycle before trailing/falling edge */
63 /* read MISO on trailing edge */
73 //! Handles a monitor command.
74 void spihandle(unsigned char app,
78 //PEEK and POKE might come later.
81 cmddata[0]=spitrans8(cmddata[0]);