#include <msp430x16x.h>
/***************************************************************************************
describe:UART SPI  mode  example
***************************************************************************************/
//definition
#define LEDPORT P5OUT
#define LEDDIR  P5DIR
#define RLEDBIT 1<<4

//MCU init
void MCUInit(void)
{
   //using 4M external oscillator crystal
 volatile unsigned int i;



  BCSCTL1 &= ~XT2OFF;                       // XT2= HF XTAL

   while ((IFG1 & OFIFG))
  {
  IFG1 &= ~OFIFG;                           // Clear OSCFault flag
  for (i = 0xFF; i > 1; i--);               // Time for flag to set
  }
                  // OSCFault flag still set?

 //BCSCTL2 |= SELM_2 +  SELS ;                        // SMCLK = MCLK= XT2 (safe) = 4M
BCSCTL2 |= SELM_1 +DIVM_3 +DIVS_3;   
}

//Led Init
void LedInit()
 {
  //Init
  LEDDIR = LEDDIR | RLEDBIT ;
  LEDPORT = LEDPORT | RLEDBIT ;

 }


//RLedOn
void RLedOn()
 {
  LEDPORT &= ~RLEDBIT;
 }
void RLedOff()
{
  LEDPORT |= ~RLEDBIT;
}
//spi init
int init_SPI()
{
    U0CTL |= SYNC;    //disableUART
    U0CTL &= ~I2C;    //disableI2C

      P4DIR |= 0x02;    //p4.2->2420_CS
      P3SEL |= 0x0E;    //P3.1,2,3 MODFUNC;	
                        //TOSH_SEL_SIMO0_MODFUNC();
                        //TOSH_SEL_SOMI0_MODFUNC();
                        //TOSH_SEL_UCLK0_MODFUNC();
      IE1 &= ~(UTXIE0 | URXIE0);  // interrupt disable
		
      U0CTL = SWRST;
      U0CTL |= CHAR | SYNC | MM;  // 8-bit char, SPI-mode, USART as master
      U0CTL &= ~(0x20);          //spi mode
		
      U0TCTL = STC ;     // 3-pin
      U0TCTL |= CKPH;    // half-cycle delayed UCLK
		

      U0TCTL &= ~(SSEL1 | SSEL0 );
      U0TCTL |= SSEL1; // use SMCLK, assuming 1MHz

	
      U0MCTL = 0;
		
      ME1 &= ~(UTXE0 | URXE0); //USART UART module disable
      ME1 |= USPIE0;   // USART SPI module enable
      U0CTL &= ~SWRST;
		
      IFG1 &= ~(UTXIFG0 | URXIFG0);
      IE1 &= ~(UTXIE0 | URXIE0);  // interrupt disabled
    return 1;
}


void main()
{
    int flag =0;
    WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
    MCUInit();
    LedInit();
    flag = init_SPI();
    if(flag)
    RLedOn();
}