传感器简介
DHT11数字温度湿度传感器是一款有已校准数字信号输出的温湿度复合传感器，其测量精度：湿度+-5%RH、温度：+-2℃；测量范围：湿度20-90%RH、温度0-50℃。
DHT11.c
1 /**
2 * @file DHT11.c
3 * @brief
4 * @version 0.1
5 * @date 2019-06-28
6 *
7 * @copyright Copyright (c) 2019 Chipintelli Technology Co., Ltd.
8 *
9 */
10 /*-----------------------------------------------------------------------------
11 include
12 -----------------------------------------------------------------------------*/
13 #include "ci_sensor.h"
14 #include "ci110x_scu.h"
15 #include "ci110x_timer.h"
16 #include "ci110x_gpio.h"
17 #include "platform_config.h"
18
19 /*-----------------------------------------------------------------------------
20 define
21 -----------------------------------------------------------------------------*/
22 #define DHT11_GPIO_GROUP (GPIO0)/*!< GPIO组 */
23 #define DHT11_GPIO_PIN (gpio_pin_2)/*!< GPIO pin脚 */
24 #define DHT11_GPIO_PAD (UART1_TX_PAD)/*!< GPIO对应PAD */
25 #define DHT11_GPIO_IRQ (GPIO0_IRQn)/*!< GPIO中断 */
26
27 #define DHT11_TIMER (TIMER0)/*!< TIMER控制器 */
28 #define DHT11_TIMER_IRQ (TIMER0_IRQn)/*!< TIMER中断 */
29 #define DHT11_TIMER_ONEUS_COUNT (get_apb_clk())
30
31 /*-----------------------------------------------------------------------------
32 extern
33 -----------------------------------------------------------------------------*/
34
35 /*-----------------------------------------------------------------------------
36 struct / enum / union
37 -----------------------------------------------------------------------------*/
38
39 /*-----------------------------------------------------------------------------
40 global
41 -----------------------------------------------------------------------------*/
42 uint8_t dht11_flag = 0xFF;/*!< 中断标志 */
43 uint8_t dht11_data[5] = {0};/*!< 二进制数据接收数组 */
44 uint8_t dht11_count = 0;/*!< GPIO中断计数控制 */
45
46 /*-----------------------------------------------------------------------------
47 declare
48 -----------------------------------------------------------------------------*/
49
50 /*-----------------------------------------------------------------------------
51 function
52 -----------------------------------------------------------------------------*/
53
54 /**
55 * @brief TIMER配置
56 */
57 void Dht11_Timer_Init(void)
58 {
59 timer_init_t init;
60 init.mode = timer_count_mode_single;
61 init.div = timer_clk_div_0;
62 init.width = timer_iqr_width_2;
63 init.count = 0xFFFFFFFF;
64 timer_init(DHT11_TIMER,init);
65 timer_start(DHT11_TIMER);
66 }
67
68 /**
69 * @brief TIMER配置毫秒级延时
70 *
71 * @param ms 毫秒
72 */
73 void Dht11_Timer_Ms(int ms)
74 {
75 timer_stop(DHT11_TIMER);
76 timer_set_count(DHT11_TIMER,ms * DHT11_TIMER_ONEUS_COUNT / 1000);
77 timer_start(DHT11_TIMER);
78 }
79
80 /**
81 * @brief TIMER配置微秒级延时
82 *
83 * @param us 微秒
84 */
85 void Dht11_Timer_Us(int us)
86 {
87 timer_stop(DHT11_TIMER);
88 timer_set_count(DHT11_TIMER,us * DHT11_TIMER_ONEUS_COUNT / 1000000);
89 timer_start(DHT11_TIMER);
90 }
91
92 /**
93 * @brief DHT11模块初始化
94 *
95 */
96 void Dht11_Init()
97 {
98 Scu_SetDeviceGate((unsigned int)DHT11_TIMER,ENABLE);
99 Scu_Setdevice_Reset((unsigned int)DHT11_TIMER);
100 Scu_Setdevice_ResetRelease((unsigned int)DHT11_TIMER);
101 NVIC_EnableIRQ(DHT11_TIMER_IRQ);
102
103 Scu_SetDeviceGate((unsigned int)DHT11_GPIO_GROUP,ENABLE);
104 Scu_Setdevice_Reset((unsigned int)DHT11_GPIO_GROUP);
105 Scu_Setdevice_ResetRelease((unsigned int)DHT11_GPIO_GROUP);
106 NVIC_EnableIRQ(DHT11_GPIO_IRQ);
107
108 Scu_SetIOReuse(DHT11_GPIO_PAD,FIRST_FUNCTION);
109 gpio_set_output_mode(DHT11_GPIO_GROUP,DHT11_GPIO_PIN);
110 gpio_set_output_high_level(DHT11_GPIO_GROUP,DHT11_GPIO_PIN);
111
112 Dht11_Timer_Init();
113 }
114
115 /**
116 * @brief DHT11模块TIMER中断程序
117 *
118 */
119 void dht11_timer_handler(void)
120 {
121 dht11_flag = 0;
122 }
123
124 /**
125 * @brief DHT11模块GPIO中断程序
126 *
127 */
128 void dht11_gpio_handler(void)
129 {
130 if(dht11_count != 0)
131 {
132 Dht11_Timer_Us(50);
133 }
134 dht11_count++;
135 }
136
137 void dht11_wait_timer(void)
138 {
139 uint32_t timeout = 0x5FFFF;
140 while(dht11_flag && timeout--);
141 dht11_flag = 0xFF;
142 }
143
144 /**
145 * @brief 初始化DHT11模块
146 *
147 * @param irq_callback 中断回调
148 * @retval RETURN_OK
149 * @retval RETURN_ERR
150 */
151 int32_t dht11_open(void)
152 {
153 Dht11_Init();
154 return RETURN_OK;
155 }
156
157 /**
158 * @brief DHT11传感器读数据
159 *
160 * @param data 读到的数据
161 * @retval RETURN_OK
162 * @retval RETURN_ERR
163 */
164 int32_t dht11_read(sensor_data_t *data)
165 {
166 uint8_t temp = 0;
167 uint8_t dht11_buf[40] = {0};
168 START:
169 gpio_set_output_mode(DHT11_GPIO_GROUP,DHT11_GPIO_PIN);
170 gpio_set_output_low_level(DHT11_GPIO_GROUP,DHT11_GPIO_PIN);
171 Dht11_Timer_Ms(20);
172 dht11_wait_timer();
173 gpio_set_output_mode(DHT11_GPIO_GROUP,DHT11_GPIO_PIN);
174 gpio_set_output_high_level(DHT11_GPIO_GROUP,DHT11_GPIO_PIN);
175 Dht11_Timer_Us(20);
176 dht11_wait_timer();
177 gpio_set_input_mode(DHT11_GPIO_GROUP,DHT11_GPIO_PIN);
178 gpio_irq_trigger_config(DHT11_GPIO_GROUP,DHT11_GPIO_PIN,up_edges_trigger);
179 for(int i = 0;i < 40;i++)
180 {
181 dht11_wait_timer();
182 dht11_buf[i] = gpio_get_input_level(DHT11_GPIO_GROUP,DHT11_GPIO_PIN);
183 }
184 gpio_set_output_mode(DHT11_GPIO_GROUP,DHT11_GPIO_PIN);
185 gpio_set_output_high_level(DHT11_GPIO_GROUP,DHT11_GPIO_PIN);
186 timer_stop(DHT11_TIMER);
187 dht11_count = 0;
188 for(int i = 0;i < 5;i++)
189 {
190 temp = 0;
191 for(int j = 0;j < 8;j++)
192 {
193 temp |= dht11_buf[j + i * 8] << (7 - j);
194 }
195 dht11_data[i] = temp;
196 }
197 temp = dht11_data[0] + dht11_data[1] + dht11_data[2] + dht11_data[3];
198 if(dht11_data[4] != temp)
199 {
200 Dht11_Timer_Us(50);
201 dht11_wait_timer();
202 goto START;
203 }
204 else
205 {
206 data->humidity = dht11_data[0] * 10;
207 }
208 return RETURN_OK;
209 }
210
211 /**
212 * @brief DHT11传感器ops
213 *
214 */
215 sensor_ops_t dht11_ops =
216 {
217 dht11_open,
218 dht11_read,
219 };
220
221 /*-----------------------------------------------------------------------------
222 end of the file
223 -----------------------------------------------------------------------------*/
DHT11.h
1 /**
2 * @file DHT11.h
3 * @brief DHT11传感器的头文件
4 * @version 0.1
5 * @date 2019-07-02
6 *
7 * @copyright Copyright (c) 2019 Chipintelli Technology Co., Ltd.
8 *
9 */
10
11 #ifndef __DHT11_H__
12 #define __DHT11_H__
13
14 /**
15 * @ingroup third_device_driver
16 * @defgroup DHT11
17 * @brief DHT11传感器驱动
18 * @{
19 */
20
21 #ifdef __cplusplus
22 extern "C" {
23 #endif
24
25 /*-----------------------------------------------------------------------------
26 include
27 -----------------------------------------------------------------------------*/
28
29 /*-----------------------------------------------------------------------------
30 define
31 -----------------------------------------------------------------------------*/
32
33 /*-----------------------------------------------------------------------------
34 extern
35 -----------------------------------------------------------------------------*/
36 extern sensor_ops_t dht11_ops;
37
38 /*-----------------------------------------------------------------------------
39 struct / enum / union
40 -----------------------------------------------------------------------------*/
41
42 /*-----------------------------------------------------------------------------
43 global
44 -----------------------------------------------------------------------------*/
45
46 /*-----------------------------------------------------------------------------
47 function declare
48 -----------------------------------------------------------------------------*/
49
50 #ifdef __cplusplus
51 }
52 #endif
53
54 /**
55 * @}
56 */
57
58 #endif
59
60 /*-----------------------------------------------------------------------------
61 end of the file
62 -----------------------------------------------------------------------------*/