DHT11湿度传感器在MSP430f5529下的驱动以P1.3为端口的程序

以下是DHT11湿度传感器在MSP430f5529下以P1.3为端口的驱动程序的示例代码：

#include <msp430.h>

#define DHT11_PIN BIT3

void delay_us(unsigned int us)
{
    __delay_cycles(us);
}

void delay_ms(unsigned int ms)
{
    __delay_cycles(1000 * ms);
}

void DHT11_start(void)
{
    P1DIR |= DHT11_PIN;
    P1OUT &= ~DHT11_PIN;
    delay_ms(20);
    P1OUT |= DHT11_PIN;
    delay_us(30);
    P1DIR &= ~DHT11_PIN;
}

unsigned char DHT11_read_byte(void)
{
    unsigned char i, res = 0;
    for (i = 0; i < 8; i++)
    {
        while (!(P1IN & DHT11_PIN));
        delay_us(30);
        if (P1IN & DHT11_PIN)
            res |= 1 << (7 - i);
        while (P1IN & DHT11_PIN);
    }
    return res;
}

void DHT11_read_data(unsigned char *temp, unsigned char *humi)
{
    unsigned char buf[5];
    unsigned char i;
    DHT11_start();
    if (P1IN & DHT11_PIN)
        return;
    while (!(P1IN & DHT11_PIN));
    while (P1IN & DHT11_PIN);
    for (i = 0; i < 5; i++)
        buf[i] = DHT11_read_byte();
    if (buf[4] == ((buf[0] + buf[1] + buf[2] + buf[3]) & 0xff))
    {
        *humi = buf[0];
        *temp = buf[2];
    }
}

int main(void)
{
    WDTCTL = WDTPW | WDTHOLD;
    P1SEL = 0;
    P1DIR &= ~DHT11_PIN;
    P1OUT &= ~DHT11_PIN;
    unsigned char temp, humi;
    while (1)
    {
        DHT11_read_data(&temp, &humi);
        // do something with temp and humi
        delay_ms(1000);
    }
    return 0;
}

该程序首先定义了DHT11_PIN为P1.3的宏，然后定义了延时函数delay_us和delay_ms。接下来，定义了DHT11_start函数，用于向DHT11发送起始信号；DHT11_read_byte函数，用于读取一个字节的数据；DHT11_read_data函数，用于读取DHT11传感器的温度和湿度值。在主函数中，首先禁用看门狗定时器，然后初始化P1.3为输入模式，并且不上拉或下拉。接着在一个循环中不断读取DHT11传感器的温度和湿度值，并且可以根据需要对这些值进行处理。最后延时1秒钟后再次读取数据。