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lunchpad MSP430G2553上使用SPI的问题?

bryant peter
Intellectual 370 points
Other Parts Discussed in Thread: MSP430G2553

lunchpad  MSP430G2553上使用SPI的官方例程如下:

//****************************************************************************** #include "msp430g2553.h"

void main(void) {   WDTCTL = WDTPW + WDTHOLD;                 // Stop watchdog timer   while (!(P1IN & BIT4));                   // If clock sig from mstr stays low,                                             // it is not yet in SPI mode     P1SEL = BIT1 + BIT2 + BIT4;   P1SEL2 = BIT1 + BIT2 + BIT4;   UCA0CTL1 = UCSWRST;                       // **Put state machine in reset**   UCA0CTL0 |= UCCKPL + UCMSB + UCSYNC;      // 3-pin, 8-bit SPI master   UCA0CTL1 &= ~UCSWRST;                     // **Initialize USCI state machine**   IE2 |= UCA0RXIE;                          // Enable USCI0 RX interrupt

  __bis_SR_register(LPM4_bits + GIE);       // Enter LPM4, enable interrupts }

// Echo character #pragma vector=USCIAB0RX_VECTOR __interrupt void USCI0RX_ISR (void) {   while (!(IFG2 & UCA0TXIFG));              // USCI_A0 TX buffer ready?   UCA0TXBUF = UCA0RXBUF; }

我下载进去,调试的时候,程序一直死在 while (!(P1IN & BIT4));     这个语句上...请问这是什么原因??SPI也不能自发自收...

  • 0
    Intellectual 370 points

    上面程序没发清楚....我再重新发下:

    #include "msp430g2553.h"

    void main(void)

    {  

       WDTCTL = WDTPW + WDTHOLD;                 // Stop watchdog timer

      while (!(P1IN & BIT4));                   // If clock sig from mstr stays low,                                             // it is not yet in SPI mode  

      P1SEL = BIT1 + BIT2 + BIT4;

      P1SEL2 = BIT1 + BIT2 + BIT4;

      UCA0CTL1 = UCSWRST;                       // **Put state machine in reset**

      UCA0CTL0 |= UCCKPL + UCMSB + UCSYNC;      // 3-pin, 8-bit SPI master   UCA0CTL1 &= ~UCSWRST;                     // **Initialize USCI state machine**  

     IE2 |= UCA0RXIE;                          // Enable USCI0 RX interrupt

      __bis_SR_register(LPM4_bits + GIE);       // Enter LPM4, enable interrupts }

    // Echo character #pragma vector=USCIAB0RX_VECTOR __interrupt void USCI0RX_ISR (void)

    {  

     while (!(IFG2 & UCA0TXIFG));              // USCI_A0 TX buffer ready?

      UCA0TXBUF = UCA0RXBUF;

    }

  • 0 回复 bryant peter
    Prodigy 20 points

     

    #include "msp430g2553.h"

    void main(void)

     {   WDTCTL = WDTPW + WDTHOLD;                 // Stop watchdog timer

      while (!(P1IN & BIT4));                   // If clock sig from mstr stays low,                                             // it is not yet in SPI mode

        P1SEL = BIT1 + BIT2 + BIT4;  

       P1SEL2 = BIT1 + BIT2 + BIT4;

       UCA0CTL1 = UCSWRST;                       // **Put state machine in reset**  

       UCA0CTL0 |= UCCKPL + UCMSB + UCSYNC;      // 3-pin, 8-bit SPI master  

       UCA0CTL1 &= ~UCSWRST;                     // **Initialize USCI state machine**

       IE2 |= UCA0RXIE;                          // Enable USCI0 RX interrupt

      __bis_SR_register(LPM4_bits + GIE);       // Enter LPM4,

     enable interrupts;

     }// Echo character

    #pragma vector=USCIAB0RX_VECTOR

    __interrupt void USCI0RX_ISR (void)

     {  

     while (!(IFG2 & UCA0TXIFG));              // USCI_A0 TX buffer ready?

       UCA0TXBUF = UCA0RXBUF;

    }

  • 0 回复 jin yuan
    TI__Mastermind 26435 points

    楼主，

     首先这是SPI的一个master程序，你搭建的平台，slave那一段少写了相应的程序吗？

    另外关于SPi的接线，先确认mosi，miso，clk都有接正确，同时slave的cs拉低了。

    谢谢