CC2530的DHT11驅(qū)動(dòng),可用于協(xié)議棧!!!

1、共2個(gè)文件：DHT11.c和DHT11.hDHT11.c#include "DHT11.h"/* 函數(shù)名稱(chēng)： Set_32MHZ* 功能 ： 設(shè)置系統(tǒng)時(shí)鐘為32MHZ* 參數(shù)列表： 無(wú) * 返回值 ： 無(wú)*/void Set_32MHZ(void) CLKCONCMD &= 0x40; /系統(tǒng)時(shí)鐘源為32MHZ晶振； while(CLKCONSTA & 0x40); /等待時(shí)鐘穩(wěn)定； CLKCONCMD &= 0x47; /系統(tǒng)主時(shí)鐘頻率：32MHZ;/* dht11.c*/32MHZ us延時(shí)函數(shù)；#pragma optimize=nonevoid

2、 dht11_delay_us(unsigned int n) n>>=1; while(n-) asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP"); asm

3、("NOP"); asm("NOP"); asm("NOP"); asm("NOP"); void delay_ms(uint32_t time) while(time-) dht11_delay_us(1000); unsigned char dht11_read_byte(void) unsigned char r_val = 0; unsigned char t_count = 0; /計(jì)時(shí)器，防止超時(shí)； unsigned char i; for(i = 0 ; i < 8 ; i+) t_count

4、= 0; /低電平50us后開(kāi)始一個(gè)數(shù)據(jù)位讀?。?while( !DHT11_PIN ) asm("NOP"); t_count+; if(t_count > 250) /超時(shí)； return 100; t_count = 0; dht11_delay_us(32); /高電平2628us表示'0',70us表示'1' if( DHT11_PIN = 1 ) r_val <<= 1; r_val |= 1; else r_val <<= 1; continue; /等待DHT11數(shù)據(jù)輸出結(jié)束； while( DH

5、T11_PIN = 1) asm("NOP"); t_count+; if(t_count>250) return 100; return r_val; char dht11_value(unsigned char *temp , unsigned char *humi , unsigned char flag) unsigned char t_count = 0; /計(jì)時(shí)器； unsigned char h_i = 0 , h_f = 0; unsigned char t_i = 0 , t_f = 0; unsigned char check_sum = 0; D

6、HT11_PIN_OUT(); DHT11_PIN_L(); /輸出低電平； /低電平持續(xù)時(shí)間必須大于18ms; delay_ms(40); /40ms; DHT11_PIN_H(); /主機(jī)結(jié)束信號(hào)； /主機(jī)等待20us40us，讀取DHT11響應(yīng)輸出； dht11_delay_us(30); DHT11_PIN_IN(); if(DHT11_PIN = 0) /正確的響應(yīng)輸出； while( !DHT11_PIN ) asm("NOP"); t_count+; if(t_count > 250) /超時(shí)； return -1; t_count = 0; dht11

7、_delay_us(50); /DHT11給出響應(yīng)輸出后會(huì)拉高總線(xiàn)80us; while( DHT11_PIN ); /等待接收； asm("NOP"); t_count+; if(t_count > 250) /超時(shí)； return -1; h_i = dht11_read_byte(); /濕度整數(shù)部分； h_f = dht11_read_byte(); /濕度小數(shù)部分； t_i = dht11_read_byte(); /溫度整數(shù)部分； t_f = dht11_read_byte(); /溫度小數(shù)部分； check_sum = dht11_read_byte()

8、; /校驗(yàn)和； /校驗(yàn)和正確或者溫濕度整數(shù)部分獲取正確即表示獲取成功！ if(check_sum = ( h_i + h_f + t_i + t_f ) | (h_i != 100 && t_i != 100) ) if(flag = DHT11_STRING) temp0 = t_i/10+0x30; temp1 = t_i%10+0x30; humi0 = h_i/10+0x30; humi1 = h_i%10+0x30; else *temp = t_i; *humi = h_i; else if(flag = DHT11_STRING) temp0 = '0&#

9、39; temp1 = '0' humi0 = '0' humi1 = '0' else *temp = 0; *humi = 0; return -1; else if(flag = DHT11_STRING) temp0 = '0' temp1 = '0' humi0 = '0' humi1 = '0' else *temp = 0; *humi = 0; return -1; return 0;DHT11.h#ifndef _DHT11_H#define _DHT11_H#in

10、clude <iocc2530.h>#include "zComDef.h"#define DHT11_PIN P0_7 /數(shù)據(jù)引腳/引腳配置為輸出；#define DHT11_PIN_OUT() P0DIR |= 1<<7; asm("NOP"); /引腳配置為輸入；#define DHT11_PIN_IN() P0DIR &= (1<<7); asm("NOP"); /拉高數(shù)據(jù)線(xiàn)；#define DHT11_PIN_H() DHT11_PIN = 1; asm("NOP&quo

11、t;); /拉低數(shù)據(jù)線(xiàn)；#define DHT11_PIN_L() DHT11_PIN = 0; asm("NOP"); void Set_32MHZ(void);/* 32MHZ us延時(shí)函數(shù)；*/void dht11_delay_us(unsigned int n);void delay_ms(uint32_t time);/* 讀DHT11傳感器； 讀取成功返回讀取值，失敗返回100(超過(guò)DHT11范圍);*/unsigned char dht11_read_byte(void);/* 獲取溫濕度數(shù)值；讀取成功返回0，失敗返回-1 第一個(gè)參數(shù)為溫度，第二個(gè)參數(shù)為濕度，第三個(gè)參數(shù)為類(lèi)型(DHT11_STRING or DHT11_UINT8)用法舉例：例一：unsigned char temp , humi;char r_val;r_val = dht11_value(&temp , &humi , DHT11_UINT8);例二：unsigned char temp2,humi2;char r_va