这篇文章基于上个工程,打开上个工程,将程序改成如下
#include <msp430.h>
#define uint8 unsigned char
#define uint16 unsigned int
uint8 key_data(void)
{
uint8 key_value=0;
if((P1IN&BIT1) == 0)
{
__delay_cycles(10000);
if((P1IN&BIT1) == 0)
{
key_value=1;
while((P1IN&BIT1) == 0);
}
}
return key_value;
}
int main(void)
{
WDTCTL = WDTPW | WDTHOLD; // Stop WDT
// Configure GPIO
P9DIR |= BIT7; // Clear P1.0 output latch for a defined power-on state
P1DIR |= BIT1;
PM5CTL0 &= ~LOCKLPM5; // Disable the GPIO power-on default high-impedance mode
// to activate previously configured port settings
while(1)
{
uint8 key_value=0;
key_value=key_data();
if(key_value==1)
{
key_value=0;
P9OUT ^= BIT7;
}
}
}
编译,运行,即可通过S1(P1.1)控制LED2(P9.7)了