DHT11代码CC2530
时间: 2023-07-03 12:30:56 浏览: 53
以下是基于CC2530芯片的DHT11温湿度传感器代码示例:
```c
#include "ioCC2530.h"
#define DHT11_PORT P2_1
#define DHT11_DIR P2DIR
#define DHT11_PIN P2
void delay_us(unsigned int time)
{
unsigned int i = 0;
while(time--)
{
for(i = 0; i < 5; i++);
}
}
void delay_ms(unsigned int time)
{
unsigned int i = 0;
while(time--)
{
for(i = 0; i < 5000; i++);
}
}
void DHT11_Init(void)
{
DHT11_DIR |= 0x02;
DHT11_PIN |= 0x02;
}
unsigned char DHT11_Read_Byte(void)
{
unsigned char i, dat = 0;
for(i = 0; i < 8; i++)
{
while(!(DHT11_PIN & 0x02));
delay_us(30);
if(DHT11_PIN & 0x02)
{
dat |= (1 << (7 - i));
}
while(DHT11_PIN & 0x02);
}
return dat;
}
void DHT11_Read_Data(unsigned char *temp, unsigned char *humi)
{
unsigned char buf[5] = {0}, i;
DHT11_Init();
DHT11_PIN &= ~0x02;
delay_ms(20);
DHT11_PIN |= 0x02;
delay_us(30);
DHT11_DIR &= ~0x02;
if(!(DHT11_PIN & 0x02))
{
while(!(DHT11_PIN & 0x02));
delay_us(80);
if(DHT11_PIN & 0x02)
{
while(DHT11_PIN & 0x02);
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];
}
}
}
DHT11_DIR |= 0x02;
DHT11_PIN |= 0x02;
}
```
这个代码中,先定义了DHT11所连接的IO口为P2_1,然后定义了延时函数。在DHT11_Init()函数中,将P2_1口设置为输出模式,并将其置高电平。在DHT11_Read_Byte()函数中,通过逐位读取的方式读取DHT11传输的8个二进制位,并返回读取到的数据字节。在DHT11_Read_Data()函数中,先初始化DHT11,然后按照DHT11的数据传输协议,读取5个字节的数据,计算校验和,最终得到温度和湿度数据。