ez430-CC2500 SPI Kommunikation

#define nSS   P3OUT_bit.P3OUT_0

#define MISO  P3IN_bit.P3IN_2

void init_SPI() {

  UCB0CTL1 = UCSWRST;                           

  UCB0CTL1 = UCSWRST | UCSSEL1;                 

  UCB0CTL0 = UCCKPH | UCMSB | UCMST | UCSYNC;   

  UCB0BR0  = 2;                                 

  UCB0BR1  = 0;                                 

  P3OUT_bit.P3OUT_0 = 1;

  P3DIR_bit.P3DIR_0 = 1;

  P3SEL = 0x0E;               

  UCB0CTL1 &= ~UCSWRST;                         

}

uint8 read_SPI(uint8_t addr)

{

    uint8 recieve;

    nSS = 0;               // Chip Select

    while(MISO);           // Warten bis CC2500 MISO low zieht

    UCB0TXBUF = addr;      // Addresse in Register laden

    while(!(IFG2 & UCB0RXIFG));  // Warten bis empfangen fertig

    recieve = UCB0RXBUF;    // Dummy mal auslesen

    UCB0TXBUF = addr;       // Dummy reinschreiben

    while(!(IFG2 & UCB0RXIFG));  // Warten bis was ankommt

    recieve = UCB0RXBUF;    // Auslesen! 

    nSS = 1;                // Chip Select 

    return(recieve);         

}