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
|
/*
* Copyright (c) 2019 Winner Microelectronics Co., Ltd.
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2018-11-9 fanwenl 1st version
*/
#include <rtdevice.h>
#include <rtthread.h>
#include "board.h"
#include "wm_i2c.h"
#include "wm_io.h"
#include "wm_gpio_afsel.h"
#include "pin_map.h"
#include "drv_i2c.h"
#ifdef BSP_USING_I2C
struct wm_i2c_bus
{
struct rt_i2c_bus_device parent;
struct rt_i2c_msg *msg;
rt_uint32_t msg_cnt;
volatile rt_uint32_t msg_ptr;
volatile rt_uint32_t dptr;
};
static struct wm_i2c_bus wm_i2c;
static rt_ssize_t wm_i2c_mst_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num);
static rt_ssize_t wm_i2c_slv_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num);
static rt_err_t wm_i2c_bus_control(struct rt_i2c_bus_device *bus,
int cmd,
void *args);
static const struct rt_i2c_bus_device_ops wm_i2c_ops =
{
wm_i2c_mst_xfer,
wm_i2c_slv_xfer,
wm_i2c_bus_control,
};
static rt_err_t wm_i2c_send_address(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg *msg)
{
uint8_t addr_msb, addr_lsb;
if (msg->flags & RT_I2C_ADDR_10BIT)
{
addr_msb = 0xf0 | ((msg->addr >> 7) & 0x06);
addr_lsb = msg->addr & 0xff;
if (msg->flags & RT_I2C_RD)
{
addr_msb |= 0x01;
}
tls_i2c_write_byte(addr_msb, 1);
tls_i2c_wait_ack();
tls_i2c_write_byte(addr_lsb, 0);
tls_i2c_wait_ack();
}
else
{
tls_i2c_write_byte((msg->addr << 1) | msg->flags, 1);
tls_i2c_wait_ack();
}
return RT_EOK;
}
static rt_ssize_t wm_i2c_mst_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num)
{
struct wm_i2c_bus *wm_i2c;
rt_size_t i;
RT_ASSERT(bus != RT_NULL);
wm_i2c = (struct wm_i2c_bus *)bus;
wm_i2c->msg = msgs;
wm_i2c->msg_ptr = 0;
wm_i2c->msg_cnt = num;
wm_i2c->dptr = 0;
for (i = 0; i < wm_i2c->msg_cnt; i++)
{
if (!(wm_i2c->msg[i].flags & RT_I2C_NO_START))
{
wm_i2c_send_address(bus, &(wm_i2c->msg[i]));
}
if (wm_i2c->msg[i].flags & RT_I2C_RD)
{
while (wm_i2c->msg[i].len > 1)
{
*wm_i2c->msg[i].buf++ = tls_i2c_read_byte(1, 0);
wm_i2c->msg[i].len--;
}
*wm_i2c->msg[i].buf = tls_i2c_read_byte(0, 0);
}
else
{
while (wm_i2c->msg[i].len > 0)
{
tls_i2c_write_byte(*wm_i2c->msg[i].buf, 0);
tls_i2c_wait_ack();
wm_i2c->msg[i].len--;
wm_i2c->msg[i].buf++;
}
}
}
wm_i2c->msg = RT_NULL;
wm_i2c->msg_ptr = 0;
wm_i2c->msg_cnt = 0;
wm_i2c->dptr = 0;
tls_i2c_stop();
for (int j = 0; j < 3000; j++);
return i;
}
static rt_ssize_t wm_i2c_slv_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num)
{
return 0;
}
static rt_err_t wm_i2c_bus_control(struct rt_i2c_bus_device *bus,
int cmd,
void *args)
{
return -RT_ERROR;
}
void WM_I2C_IRQHandler(void)
{
extern void I2C_IRQHandler(void);
/* enter interrupt */
rt_interrupt_enter();
I2C_IRQHandler();
/* leave interrupt */
rt_interrupt_leave();
}
int wm_hw_i2c_init(void)
{
rt_int16_t gpio_pin;
gpio_pin = wm_get_pin(WM_I2C_SCL_PIN);
if (gpio_pin >= 0)
{
wm_i2c_scl_config((enum tls_io_name)gpio_pin);
}
gpio_pin = wm_get_pin(WM_I2C_DAT_PIN);
if (gpio_pin >= 0)
{
wm_i2c_sda_config((enum tls_io_name)gpio_pin);
}
tls_i2c_init(WM_HW_I2C_FREQ);
wm_i2c.parent.ops = &wm_i2c_ops;
#ifdef WM_I2C_BUS_NAME
rt_i2c_bus_device_register(&wm_i2c.parent, WM_I2C_BUS_NAME);
#else
rt_i2c_bus_device_register(&wm_i2c.parent, "i2c");
#endif
return 0;
}
INIT_DEVICE_EXPORT(wm_hw_i2c_init);
#endif /* BSP_USING_I2C */
|
