机接收不到

只看该作者 · 2019-9-8 19:19

主机程序：
#include  <msp430x14x.h>
char MST_Data = 0x00；

void main(void)
{
  unsigned int i;
  WDTCTL = WDTPW + WDTHOLD;                // Stop WDT
  P3SEL = 0x00E;                         // Setup P3 for SPI mode
  P3OUT = 0x020;                         // Setup P3.4 for Scope trigger and
  P3DIR |= 0x030;                         // P3.5 for slave initialization
  U0CTL = CHAR + SYNC + MM + SWRST;       // 8-bit, SPI, Master
  U0TCTL = CKPL + SSEL1 + STC;             // Polarity, SMCLK, 3-wire
  U0BR0 = 0x002;                         // SPICLK = SMCLK/2
  U0BR1 = 0x000;
  U0MCTL = 0x000;
  ME1 = USPIE0;                            // Module enable
  U0CTL &= ~SWRST;                         // SPI enable
  IE1 |= URXIE0;                         // Recieve interrupt enable
  _EINT();                               // Enable interrupts
  P3OUT &= ~0x020;                         // Toggle P3.5: slave reset
  P3OUT |= 0x020;
  i = 50000;                               // Delay
  do (i--);
  while (i != 0);
  while (1)
  {
TXBUF0 = MST_Data;                   // Transmit first character
LPM0;                                  // CPU off
  }
} // End Main
#pragma vector=USART0RX_VECTOR
__interrupt void SPI0_rx (void)
{

  P3OUT ^= 0x010;                         // XOR P3.4 for scope trigger
  while ((IFG1 & UTXIFG0) == 0);          // USART0 TX buffer ready?

TXBUF0 = 0x0F;

}

从机程序：
#include  <msp430x14x.h>
char MST_Data = 0x00, SLV_Data = 0xFF;
void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                // Stop WDT
  P3SEL |= 0x0E;                            // Setup P3 for SPI mode
  U0CTL &=~MM;
  U0CTL = CHAR + SYNC + SWRST;             // 8-bit, SPI, Slave
  U0TCTL = CKPL + STC;                   // Polarity, UCLK, 3-wire
  ME1 = USPIE0;                            // Module enable
  U0CTL &= ~SWRST;                         // SPI enable

  while (1)
  {
if(IFG1 & URXIFG0)
{
   while (!(IFG1 & UTXIFG0));
   TXBUF0 = U0RXBUF;
   LPM4;
}
  }
}
刚开始测试的时候发现不能进入中断服务函数，所以我直接改成了现在查询方式输出，这样可以吗？