msp430g2553智能窗帘代码

以下是一个基于MSP430G2553的智能窗帘控制代码的示例：

#include <msp430.h>

#define OPEN 0
#define CLOSE 1

void initPWM(void);
void setPWM(int dutyCycle);
void openCurtain(void);
void closeCurtain(void);

int main(void)
{
    WDTCTL = WDTPW | WDTHOLD;   // stop watchdog timer

    P1DIR |= BIT2;              // P1.2 as output for PWM signal
    P1OUT &= ~BIT2;             // initialize to off

    P1DIR &= ~BIT3;             // P1.3 as input for open button
    P1REN |= BIT3;              // enable pull-up resistor
    P1OUT |= BIT3;              // initialize to high

    P1DIR &= ~BIT4;             // P1.4 as input for close button
    P1REN |= BIT4;              // enable pull-up resistor
    P1OUT |= BIT4;              // initialize to high

    initPWM();                  // initialize PWM module

    while(1)
    {
        if(!(P1IN & BIT3))      // check if open button is pressed
        {
            openCurtain();      // open the curtain
            __delay_cycles(1000000); // add delay to prevent button bouncing
        }
        else if(!(P1IN & BIT4)) // check if close button is pressed
        {
            closeCurtain();     // close the curtain
            __delay_cycles(1000000); // add delay to prevent button bouncing
        }
    }
}

void initPWM(void)
{
    TA0CCR0 = 100;              // set period to 100 cycles
    TA0CCTL1 = OUTMOD_7;        // set PWM mode to reset/set
    TA0CCR1 = 0;                // set initial duty cycle to 0
    TA0CTL = TASSEL_2 + MC_1;   // select SMCLK as clock source and up mode
}

void setPWM(int dutyCycle)
{
    TA0CCR1 = dutyCycle;        // set duty cycle
}

void openCurtain(void)
{
    int i;
    for(i = 0; i <= 100; i++)   // gradually increase duty cycle to open curtain
    {
        setPWM(i);
        __delay_cycles(10000);  // add delay for smoother transition
    }
}

void closeCurtain(void)
{
    int i;
    for(i = 100; i >= 0; i--)   // gradually decrease duty cycle to close curtain
    {
        setPWM(i);
        __delay_cycles(10000);  // add delay for smoother transition
    }
}

该代码使用了MSP430G2553的PWM模块来控制窗帘的开合，使用P1.2口输出PWM信号。同时，该代码还使用了P1.3和P1.4口作为开和关按钮的输入口，通过检测这两个按钮的状态来控制窗帘的开合。

`initPWM()`函数用于初始化PWM模块，`setPWM()`函数用于设置PWM占空比，`openCurtain()`和`closeCurtain()`函数用于控制窗帘的开合。在`openCurtain()`和`closeCurtain()`函数中，通过逐渐增加或逐渐减少PWM占空比来实现平滑的开合过程。在每次改变PWM占空比后，通过添加适当的延时来确保窗帘可以平稳地运动。