MSP430F5438A USCI_B I2C Slave模式无响应

user6352220

采用官方代码

unsigned char TXData;
unsigned char i=0;

int main(void)
{
WDTCTL = WDTPW + WDTHOLD;               // Stop WDT

P3SEL |= 0x06;                          // Assign I2C pins to USCI_B0
UCB0CTL1 |= UCSWRST;                       // Enable SW reset
UCB0CTL0 = UCMODE_3 + UCSYNC;             // I2C Slave, synchronous mode
UCB0I2COA = 0x48;                         // Own Address is 048h
UCB0CTL1 &= ~UCSWRST;                  // Clear SW reset, resume operation
UCB0IE |= UCTXIE + UCSTTIE + UCSTPIE;     // Enable TX interrupt
                                          // Enable Start condition interrupt
TXData = 0;                               // Used to hold TX data

__bis_SR_register(LPM0_bits + GIE);    // Enter LPM0 w/ interrupts
__no_operation();                      // For debugger
}

// USCI_B0 State ISR
#pragma vector = USCI_B0_VECTOR
__interrupt void USCI_B0_ISR(void)
{
switch(__even_in_range(UCB0IV,12))
{
case 0: break;                           // Vector 0: No interrupts
case 2: break;                           // Vector 2: ALIFG
case 4: break;                           // Vector 4: NACKIFG
case 6:                                   // Vector 6: STTIFG
     UCB0IFG &= ~UCSTTIFG;   // Clear start condition int flag
     break;
case 8:                                   // Vector 8: STPIFG
    TXData++;                               // Increment TXData
    UCB0IFG &= ~UCSTPIFG;    // Clear stop condition int flag
    break;
case 10: break;                         // Vector 10: RXIFG
case 12:                                 // Vector 12: TXIFG
    UCB0TXBUF = TXData;        // TX data
    break;
default: break;
}
}