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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023/06/01 chushicheng first version
*/
#include "drv_soft_i2c.h"
#ifdef BSP_USING_SOFT_I2C
#define DBG_LEVEL DBG_LOG
#include <rtdbg.h>
#define LOG_TAG "DRV.I2C"
static const struct pico_soft_i2c_config soft_i2c_config[] =
{
#ifdef BSP_USING_SOFT_I2C1
I2C1_BUS_CONFIG,
#endif
};
static struct pico_i2c i2c_obj[sizeof(soft_i2c_config) / sizeof(soft_i2c_config[0])];
/**
* This function initializes the i2c pin.
*
* @param pico i2c dirver class.
*/
static void pico_i2c_gpio_init(struct pico_i2c *i2c)
{
struct pico_soft_i2c_config* cfg = (struct pico_soft_i2c_config*)i2c->ops.data;
rt_pin_mode(cfg->scl, PIN_MODE_OUTPUT_OD);
rt_pin_mode(cfg->sda, PIN_MODE_OUTPUT_OD);
rt_pin_write(cfg->scl, PIN_HIGH);
rt_pin_write(cfg->sda, PIN_HIGH);
}
static void pico_i2c_pin_init(void)
{
rt_size_t obj_num = sizeof(i2c_obj) / sizeof(struct pico_i2c);
for(rt_size_t i = 0; i < obj_num; i++)
{
pico_i2c_gpio_init(&i2c_obj[i]);
}
}
/**
* This function sets the sda pin.
*
* @param pico config class.
* @param The sda pin state.
*/
static void pico_set_sda(void *data, rt_int32_t state)
{
struct pico_soft_i2c_config* cfg = (struct pico_soft_i2c_config*)data;
if (state)
{
rt_pin_write(cfg->sda, PIN_HIGH);
}
else
{
rt_pin_write(cfg->sda, PIN_LOW);
}
}
/**
* This function sets the scl pin.
*
* @param pico config class.
* @param The scl pin state.
*/
static void pico_set_scl(void *data, rt_int32_t state)
{
struct pico_soft_i2c_config* cfg = (struct pico_soft_i2c_config*)data;
if (state)
{
rt_pin_write(cfg->scl, PIN_HIGH);
}
else
{
rt_pin_write(cfg->scl, PIN_LOW);
}
}
/**
* This function gets the sda pin state.
*
* @param The sda pin state.
*/
static rt_int32_t pico_get_sda(void *data)
{
struct pico_soft_i2c_config* cfg = (struct pico_soft_i2c_config*)data;
return rt_pin_read(cfg->sda);
}
/**
* This function gets the scl pin state.
*
* @param The scl pin state.
*/
static rt_int32_t pico_get_scl(void *data)
{
struct pico_soft_i2c_config* cfg = (struct pico_soft_i2c_config*)data;
return rt_pin_read(cfg->scl);
}
/**
* The time delay function.
*
* @param microseconds.
*/
static void pico_udelay(rt_uint32_t us)
{
busy_wait_us_32(us);
}
static const struct rt_i2c_bit_ops pico_bit_ops_default =
{
.data = RT_NULL,
.pin_init = pico_i2c_pin_init,
.set_sda = pico_set_sda,
.set_scl = pico_set_scl,
.get_sda = pico_get_sda,
.get_scl = pico_get_scl,
.udelay = pico_udelay,
.delay_us = 1,
.timeout = 100,
.i2c_pin_init_flag = RT_FALSE
};
/**
* if i2c is locked, this function will unlock it
*
* @param pico config class
*
* @return RT_EOK indicates successful unlock.
*/
static rt_err_t pico_i2c_bus_unlock(const struct pico_soft_i2c_config *cfg)
{
rt_int32_t i = 0;
if (PIN_LOW == rt_pin_read(cfg->sda))
{
while (i++ < 9)
{
rt_pin_write(cfg->scl, PIN_HIGH);
pico_udelay(100);
rt_pin_write(cfg->scl, PIN_LOW);
pico_udelay(100);
}
}
if (PIN_LOW == rt_pin_read(cfg->sda))
{
return -RT_ERROR;
}
return RT_EOK;
}
/* I2C initialization function */
int rt_soft_i2c_init(void)
{
rt_err_t result;
for (rt_size_t i = 0; i < sizeof(i2c_obj) / sizeof(struct pico_i2c); i++)
{
i2c_obj[i].ops = pico_bit_ops_default;
i2c_obj[i].ops.data = (void*)&soft_i2c_config[i];
i2c_obj[i].i2c_bus.priv = &i2c_obj[i].ops;
result = rt_i2c_bit_add_bus(&i2c_obj[i].i2c_bus, soft_i2c_config[i].bus_name);
RT_ASSERT(result == RT_EOK);
pico_i2c_bus_unlock(&soft_i2c_config[i]);
LOG_D("software simulation %s init done, pin scl: %d, pin sda %d",
soft_i2c_config[i].bus_name,
soft_i2c_config[i].scl,
soft_i2c_config[i].sda);
}
return RT_EOK;
}
INIT_DEVICE_EXPORT(rt_soft_i2c_init);
#endif /* BSP_USING_SOFT_I2C */
|
