msp430f5529驱动dht11代码

以下是msp430f5529驱动dht11的示例代码：

#include <msp430.h>

#define DHT11_PORT P1
#define DHT11_PIN BIT2

unsigned char dht11_data[5];

void dht11_start(void);
unsigned char dht11_read_byte(void);
void dht11_read_data(void);
unsigned char dht11_verify_checksum(void);

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

    P1DIR |= BIT0;  // P1.0 as output

    while (1)
    {
        dht11_start();
        dht11_read_data();

        if (dht11_verify_checksum())
        {
            // Temperature and humidity data is valid
            unsigned int temp = (dht11_data[2] << 8) | dht11_data[3];
            unsigned int humi = (dht11_data[0] << 8) | dht11_data[1];

            // Output temperature and humidity to LED
            P1OUT = (temp & 0xFF) | ((humi & 0xFF) << 4);
        }

        __delay_cycles(1000000);    // Wait for a second
    }
}

void dht11_start(void)
{
    DHT11_PORT->DIR |= DHT11_PIN;
    DHT11_PORT->OUT &= ~DHT11_PIN;
    __delay_cycles(18000);
    DHT11_PORT->OUT |= DHT11_PIN;
    __delay_cycles(40);
    DHT11_PORT->DIR &= ~DHT11_PIN;
    while (DHT11_PORT->IN & DHT11_PIN);
    while (!(DHT11_PORT->IN & DHT11_PIN));
    while (DHT11_PORT->IN & DHT11_PIN);
}

unsigned char dht11_read_byte(void)
{
    unsigned char byte = 0;
    unsigned char i;
    for (i = 0; i < 8; i++)
    {
        while (!(DHT11_PORT->IN & DHT11_PIN));
        __delay_cycles(30);
        if (DHT11_PORT->IN & DHT11_PIN)
            byte |= (1 << (7 - i));
        while (DHT11_PORT->IN & DHT11_PIN);
    }
    return byte;
}

void dht11_read_data(void)
{
    unsigned char i;
    for (i = 0; i < 5; i++)
        dht11_data[i] = dht11_read_byte();
}

unsigned char dht11_verify_checksum(void)
{
    unsigned char sum = dht11_data[0] + dht11_data[1] + dht11_data[2] + dht11_data[3];
    return (dht11_data[4] == sum);
}

这个示例代码通过 MSP430F5529 控制器驱动 DHT11 温湿度传感器，读取传感器的温度和湿度数据，并通过 LED 灯的亮灭来显示温度和湿度值。在这个示例代码中，我们定义了 `DHT11_PORT` 和 `DHT11_PIN` 来控制传感器的读取，然后定义了 `dht11_start`、`dht11_read_byte`、`dht11_read_data` 和 `dht11_verify_checksum` 函数来读取传感器数据。