MSP430F149学习之路——SPI

代码一：

 //******************************************************************************
 //Description:SPI slave talks to SPI master using 3-wire mode. Data is sent
 //to the master starting at 0x00 and increments. Received data from the
 //master is expected to start at 0xff and decrements with each transmission.
 //******************************************************************************
 #include <msp430x14x.h>
 char MST_data = 0x00,SLV_data = 0XFF;
 void main()
 {
   WDTCTL = WDTPW + WDTHOLD;

   P6DIR |= BIT0;
   P6OUT |= BIT0;
   P3SEL = 0X0E;                        //P3.1,2,3 SPI option select
   P3DIR |= BIT1;
   P3OUT |= BIT1;

   U0CTL |= SWRST + SYNC + MM +CHAR;   //master spi 8-bit
   U0TCTL |= CKPH + SSEL1 + STC;
   U0TCTL &= ~CKPL;

   U0BR0 = 0X02;                      //SPICLK = SMCLK/2
   U0BR1 = 0X00;
   U0MCTL = 0X00;

   ME1 = USPIE0;
   U0CTL &= ~SWRST;
   IE1 |= URXIE0;     //receive enable
   _EINT();

   while()
   {
     TXBUF0 = MST_data;
     LPM0;
   }
 }
 #pragma vector=USART0RX_VECTOR
 __interrupt void SPI_RX()
 {
   P6OUT ^= BIT0;
   while((IFG1 & UTXIFG0)==);
   if(U0RXBUF == SLV_data)
   {
     SLV_data = SLV_data - ;
     MST_data = MST_data + ;
     U0TXBUF  = MST_data;
   }
   else
     TXBUF0 = MST_data;
 }

代码二：

 #include <msp430x14x.h>
 char MST_data = 0x00,SLV_data = 0xff;
 void main()
 {
   WDTCTL = WDTPW + WDTHOLD;
   P3SEL = 0X0E;
   UOCTL = CHAR + SYNC + SWRST;
   U0TCTL = CKPL + SSEL1 + STC;
   U0CLT &= ~CKPH;

   ME1 |= USPIE0;
   U0CTL &= ~SWRST;
   IE1 |= URXIE0;
   _EINT();
   while()
   {
     TXBUF0 = SLV_data;
     LMP4;
   }
 }
 #pragma vector=USART0RX_VECTOR
 __interrupt void USART0_RX()
 {
   while((IFG1 & OFIFG)==);
   if(U0RXBUF == MST_data)
   {
     SLV_data = SLV_data - ;
     MST_data = MST_data + ;
     TXBUF0 = SLV_data;
   }
   else
     TXBUF0 = SLV_data;
 }