MSP430FR2633怎么打开单键扫描？

你说的是按键中断程序吗？

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* MSP430 CODE EXAMPLE DISCLAIMER
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* MSP430 code examples are self-contained low-level programs that typically
* demonstrate a single peripheral function or device feature in a highly
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* register values and settings such as the clock configuration and care must
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//******************************************************************************
// MSP430FR243x Demo - LPM4.5, Device enters LPM4.5 waiting for a port
// interrupt on P1.3
//
// Description: Download and run the program. Program automatically enters
// LPM4.5 and measure the current. Use button SW2 (or P1.3) on the
// Target board to wake the device up from LPM4.5. This enables
// the LFXT oscillator and blink the LED (on P1.0).
//
// ACLK = XT1 = 32kHz, MCLK = SMCLK = default DCODIV = ~1MHz.
//
// MSP430FR2433
// -----------------
// /|\| |
// | | |
// | | XIN(P2.0)|--
// --|RST | 32768Hz
// | XOUT(P2.1)|--
// | |
// | P1.0|-->LED
// | |
// | P1.3|<---Button
//
// Ling Zhu
// Texas Instruments Inc.
// Feb 2015
// Built with IAR Embedded Workbench v6.20 & Code Composer Studio v6.0.1
//******************************************************************************
#include <msp430.h>

void initGpio(void);

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

// Configure GPIO
initGpio();

// Determine whether we are coming out of an LPMx.5 or a regular RESET.
if (SYSRSTIV == SYSRSTIV_LPM5WU) // MSP430 just woke up from LPMx.5
{

// Initialize XT1 32kHz crystal
P2SEL0 |= BIT0 | BIT1; // set XT1 pin as second function
do
{
CSCTL7 &= ~(XT1OFFG | DCOFFG); // Clear XT1 and DCO fault flag
SFRIFG1 &= ~OFIFG;
} while (SFRIFG1 & OFIFG); // Test oscillator fault flag
}
else
{
// Device powered up from a cold start.
// It configures the device and puts the device into LPM4.5

P1DIR &= ~(BIT3); // Configure P1.3 as input direction pin
P1OUT |= BIT3; // Configure P1.3 as pulled-up
P1REN |= BIT3; // P1.3 pull-up register enable
P1IES |= BIT3; // P1.3 Hi/Low edge
P1IFG = 0; // Clear all P1 interrupt flags
P1IE |= BIT3; // P1.3 interrupt enabled

// Explicitly clear RTC control registers to disable it
// just incase if the RTC was previously enabled
RTCCTL = 0;

PMMCTL0_H = PMMPW_H; // Open PMM Registers for write
PMMCTL0_L |= PMMREGOFF; // and set PMMREGOFF
PMMCTL0_H = 0; // Lock PMM Registers

// Enter LPM4 Note that this operation does not return. The LPM4.5
// will exit through a RESET event, resulting in a re-start
// of the code.
__bis_SR_register(LPM4_bits | GIE);
}

// Now blink the LED in an endless loop.
while (1)
{
P1OUT ^= BIT0; // P1.0 = toggle
__delay_cycles(100000);
}
}

void initGpio()
{
P1DIR = 0xFB; P2DIR = 0xFF; P3DIR = 0xFF;
P1REN = 0xFF; P2REN = 0xFF; P3REN = 0xFF;
P1OUT = 0x00; P2OUT = 0x00; P3OUT = 0x00;

// Disable the GPIO power-on default high-impedance mode
// to activate previously configured port settings
PM5CTL0 &= ~LOCKLPM5;
}