1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
/*
* Copyright (c) 2016 Intel Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <kernel.h>
#include <device.h>
#include <i2c.h>
#include <misc/byteorder.h>
#include <misc/util.h>
#include <sensor.h>
#include <misc/__assert.h>
#include "th02.h"
static uint8_t read8(struct device *dev, uint8_t d)
{
uint8_t buf;
if (i2c_reg_read_byte(dev, TH02_I2C_DEV_ID, d, &buf) < 0) {
SYS_LOG_ERR("Error reading register.");
}
return buf;
}
static int is_ready(struct device *dev)
{
uint8_t status;
if (i2c_reg_read_byte(dev, TH02_I2C_DEV_ID,
TH02_REG_STATUS, &status) < 0) {
SYS_LOG_ERR("error reading status register");
}
if (status & TH02_STATUS_RDY_MASK) {
return 0;
} else {
return 1;
}
}
static uint16_t get_humi(struct device *dev)
{
uint16_t humidity = 0;
if (i2c_reg_write_byte(dev, TH02_I2C_DEV_ID,
TH02_REG_CONFIG, TH02_CMD_MEASURE_HUMI) < 0) {
SYS_LOG_ERR("Error writing register");
return 0;
}
while (!is_ready(dev)) {
}
;
humidity = read8(dev, TH02_REG_DATA_H) << 8;
humidity |= read8(dev, TH02_REG_DATA_L);
humidity >>= 4;
return humidity;
}
uint16_t get_temp(struct device *dev)
{
uint16_t temperature = 0;
if (i2c_reg_write_byte(dev, TH02_I2C_DEV_ID,
TH02_REG_CONFIG, TH02_CMD_MEASURE_TEMP) < 0) {
SYS_LOG_ERR("Error writing register");
return 0;
}
while (!is_ready(dev)) {
}
;
temperature = read8(dev, TH02_REG_DATA_H) << 8;
temperature |= read8(dev, TH02_REG_DATA_L);
temperature >>= 2;
return temperature;
}
static int th02_sample_fetch(struct device *dev, enum sensor_channel chan)
{
struct th02_data *drv_data = dev->driver_data;
__ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL || chan == SENSOR_CHAN_TEMP);
drv_data->t_sample = get_temp(drv_data->i2c);
SYS_LOG_INF("temp: %u", drv_data->t_sample);
drv_data->rh_sample = get_humi(drv_data->i2c);
SYS_LOG_INF("rh: %u", drv_data->rh_sample);
return 0;
}
static int th02_channel_get(struct device *dev, enum sensor_channel chan,
struct sensor_value *val)
{
struct th02_data *drv_data = dev->driver_data;
__ASSERT_NO_MSG(chan == SENSOR_CHAN_TEMP ||
chan == SENSOR_CHAN_HUMIDITY);
if (chan == SENSOR_CHAN_TEMP) {
/* val = sample / 32 - 50 */
val->val1 = drv_data->t_sample / 32 - 50;
val->val2 = (drv_data->t_sample % 32) * (1000000 / 32);
} else {
/* val = sample / 16 -24 */
val->val1 = drv_data->rh_sample / 16 - 24;
val->val2 = (drv_data->rh_sample % 16) * (1000000 / 16);
}
return 0;
}
static const struct sensor_driver_api th02_driver_api = {
.sample_fetch = th02_sample_fetch,
.channel_get = th02_channel_get,
};
static int th02_init(struct device *dev)
{
struct th02_data *drv_data = dev->driver_data;
drv_data->i2c = device_get_binding(CONFIG_TH02_I2C_MASTER_DEV_NAME);
if (drv_data->i2c == NULL) {
SYS_LOG_ERR("Failed to get pointer to %s device!",
CONFIG_TH02_I2C_MASTER_DEV_NAME);
return -EINVAL;
}
dev->driver_api = &th02_driver_api;
return 0;
}
static struct th02_data th02_driver;
DEVICE_INIT(th02, CONFIG_TH02_NAME, th02_init, &th02_driver,
NULL, POST_KERNEL, CONFIG_SENSOR_INIT_PRIORITY);
|
