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
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2020-08-21 heyuanjie87 first version
* 2023-03-31 Vandoul formatting code.
*/
#include <rtthread.h>
#include <rtdevice.h>
#include "i2c.h"
#include "board.h"
#include "drivers/dev_i2c.h"
#ifdef RT_USING_I2C
static rt_err_t ki2c_send(
volatile i2c_t *i2c_adapter,
rt_uint8_t *send_buf,
rt_uint32_t send_buf_len)
{
rt_uint32_t fifo_len, index;
while (send_buf_len)
{
fifo_len = 8 - i2c_adapter->txflr;
fifo_len = send_buf_len < fifo_len ? send_buf_len : fifo_len;
for (index = 0; index < fifo_len; index++)
i2c_adapter->data_cmd = I2C_DATA_CMD_DATA(*send_buf++);
if (i2c_adapter->tx_abrt_source != 0)
{
while (i2c_adapter->status & I2C_STATUS_ACTIVITY); //
i2c_adapter->clr_intr = i2c_adapter->clr_intr; //
return -RT_ERROR;
}
send_buf_len -= fifo_len;
}
return RT_EOK;
}
static rt_err_t ki2c_recv(
volatile i2c_t *i2c_adapter,
rt_uint8_t *receive_buf,
rt_uint32_t receive_buf_len)
{
rt_uint32_t fifo_len, index;
rt_uint32_t rx_len = receive_buf_len;
while (receive_buf_len || rx_len)
{
fifo_len = i2c_adapter->rxflr;
fifo_len = rx_len < fifo_len ? rx_len : fifo_len;
for (index = 0; index < fifo_len; index++)
*receive_buf++ = (rt_uint8_t)i2c_adapter->data_cmd;
rx_len -= fifo_len;
fifo_len = 8 - i2c_adapter->txflr;
fifo_len = receive_buf_len < fifo_len ? receive_buf_len : fifo_len;
for (index = 0; index < fifo_len; index++)
i2c_adapter->data_cmd = I2C_DATA_CMD_CMD;
if (i2c_adapter->tx_abrt_source != 0)
return -RT_ERROR;
receive_buf_len -= fifo_len;
}
return RT_EOK;
}
static void ki2c_setaddr(
volatile i2c_t *i2c_adapter,
rt_uint16_t addr,
int width)
{
i2c_adapter->tar = I2C_TAR_ADDRESS(addr) & I2C_TAR_ADDRESS_MASK;
if(width == 10)
{
i2c_adapter->tar |= I2C_TAR_10BITADDR_MASTER;
}
else
{
i2c_adapter->tar &= ~I2C_TAR_10BITADDR_MASTER;
}
}
static int ki2c_waittx(volatile i2c_t *i2c_adapter, int timeout_ms)
{
rt_tick_t start;
start = rt_tick_get();
while ((i2c_adapter->status & I2C_STATUS_ACTIVITY) || !(i2c_adapter->status & I2C_STATUS_TFE))
{
if (rt_tick_from_millisecond(rt_tick_get() - start) > timeout_ms)
break;
}
if (i2c_adapter->tx_abrt_source != 0)
return -RT_ERROR;
return RT_EOK;
}
static void ki2c_clearerr(volatile i2c_t *i2c_adapter)
{
i2c_adapter->clr_tx_abrt = i2c_adapter->clr_tx_abrt;
}
static rt_ssize_t _i2c_mst_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[],
rt_uint32_t num)
{
rt_ssize_t i;
i2c_t *kbus = (i2c_t *)bus->priv;
rt_err_t status;
int waittx = 0;
RT_ASSERT(bus != RT_NULL);
if(msgs[0].flags & RT_I2C_ADDR_10BIT)
{
ki2c_setaddr(kbus, msgs[0].addr, 10);
}
else
{
ki2c_setaddr(kbus, msgs[0].addr, 7);
}
ki2c_clearerr(kbus);
for (i = 0; i < num; i++)
{
waittx = 0;
if (msgs[i].flags & RT_I2C_RD)
{
status = ki2c_recv(kbus, msgs[i].buf, msgs[i].len);
}
else
{
status = ki2c_send(kbus, msgs[i].buf, msgs[i].len);
waittx = 1;
}
if (status != RT_EOK)
{
goto _out;
}
}
if (waittx)
{
status = ki2c_waittx(kbus, 2000);
if (status != RT_EOK)
{
goto _out;
}
}
return i;
_out:
return status;
}
static const struct rt_i2c_bus_device_ops i2c_ops =
{
.master_xfer = _i2c_mst_xfer,
.slave_xfer = RT_NULL,
.i2c_bus_control = RT_NULL,
};
int rt_hw_i2c_init(void)
{
struct rt_i2c_bus_device *busdev;
#ifdef BSP_USING_I2C0
static struct rt_i2c_bus_device i2c_dev0;
busdev = &i2c_dev0;
busdev->ops = &i2c_ops;
busdev->priv = (void *)I2C0_BASE_ADDR;
i2c_init(I2C_DEVICE_0, 0, 7, 100000);
rt_i2c_bus_device_register(busdev, "i2c0");
#endif
#ifdef BSP_USING_I2C1
static struct rt_i2c_bus_device i2c_dev1;
busdev = &i2c_dev1;
busdev->ops = &i2c_ops;
busdev->priv = (void *)I2C1_BASE_ADDR;
i2c_init(I2C_DEVICE_1, 0, 7, 100000);
rt_i2c_bus_device_register(busdev, "i2c1");
#endif
#ifdef BSP_USING_I2C2
static struct rt_i2c_bus_device i2c_dev2;
busdev = &i2c_dev2;
busdev->ops = &i2c_ops;
busdev->priv = (void *)I2C2_BASE_ADDR;
i2c_init(I2C_DEVICE_2, 0, 7, 100000);
rt_i2c_bus_device_register(busdev, "i2c2");
#endif
return 0;
}
INIT_BOARD_EXPORT(rt_hw_i2c_init);
#endif
|
