msp430 串口低功耗代码

MSP430是一种低功耗微控制器,它可以使用串口通信.下面是一个简单的MSP430串口低功耗代码示例:

#include <msp430.h>

void main(void)
{
    WDTCTL = WDTPW | WDTHOLD;   // Stop watchdog timer
    DCOCTL = 0;                 // Select lowest DCOx and MODx settings
    BCSCTL1 = CALBC1_1MHZ;      // Set DCO to 1MHz
    DCOCTL = CALDCO_1MHZ;

    P1SEL = BIT1 + BIT2 ;        // P1.1 = RXD, P1.2=TXD
    P1SEL2 = BIT1 + BIT2 ;       // P1.1 = RXD, P1.2=TXD
    UCA0CTL1 |= UCSSEL_2;       // SMCLK
    UCA0BR0 = 104;              // 1MHz 9600
    UCA0BR1 = 0;                // 1MHz 9600
    UCA0MCTL = UCBRS0;          // Modulation UCBRSx = 1
    UCA0CTL1 &= ~UCSWRST;       // **Initialize USCI state machine**
    IE2 |= UCA0RXIE;            // Enable USCI_A0 RX interrupt

    __bis_SR_register(LPM0_bits + GIE); // Enter LPM0, interrupts enabled
}

//  USCI A0/B0 Transmit ISR
#pragma vector=USCIAB0TX_VECTOR
__interrupt void USCI0TX_ISR(void)
{
    UCA0TXBUF = TXData;                 // TX data
    __bic_SR_register_on_exit(CPUOFF);   // Clear LPM0 bits from 0(SR)
}

//  USCI A0/B0 Receive ISR
#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCI0RX_ISR(void)
{
    RXData = UCA0RXBUF;                // Store received data
    __bic_SR_register_on_exit(CPUOFF); // Clear LPM0 bits from 0(SR)
}

这段代码设置了MSP430的串口通信,设置了波特率9600,等待接收串口数据,并在接收到数据时打断进入ISR中处理,可以在处理完数据后进入低功耗模式.