spi_m_mode.c

TI MSP430 SPI通信的主从模式

#include<msp430x44x.h>
char MST_Data=0X00,SLV_Data=0XFF;
void Init(void);
void main(void)
{ 
  unsigned int i;
  WDTCTL=WDTPW+WDTHOLD;
  Init();
  _EINT();
  P3OUT&=~0X020;
  P3OUT|=0X020;
  i=50000;
  do(i--);
  while(i!=0);
  while(1)
  {
    TXBUF0=MST_Data;
    LPM0;
  }
}
void Init(void)
{
  P1OUT=0X000;
  P1DIR=0X001;
  P3SEL=0X00E;
  UCTL0=CHAR+SYNC+MM+SWRST;
  UTCTL0=STC+SSEL1+CKPL;
  UBR00=0X02;
  UBR01=0X00;
  UMCTL0=0;
  ME1=USPIE0;
  UCTL0&=~SWRST;
  IE1=URXIE0;
 }
#pragma vector=USART0RX_VECTOR
__interrupt void SPI0_rx(void)
{
  P3OUT^=0X010;
  while ((IFG1&UTXIFG0)==0);
  if (U0RXBUF==SLV_Data)
  {
    SLV_Data=SLV_Data-1;
    MST_Data=MST_Data+1;
    TXBUF0=MST_Data;
    P1OUT|=0X001;
    P1OUT&=~0X001;
  }  
  else 
  {
    TXBUF0=MST_Data;
    P1OUT|=0X001;
  }
}