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
|
/*
* Copyright (c) 2006-2024, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-04-06 YangXi The first version
*/
#include <rtdevice.h>
#include "fsl_lpi2c.h"
#include "fsl_lpi2c_edma.h"
#include "fsl_edma.h"
#ifdef RT_USING_I2C
enum
{
#ifdef BSP_USING_I2C0
I2C0_INDEX,
#endif
#ifdef BSP_USING_I2C1
I2C1_INDEX,
#endif
#ifdef BSP_USING_I2C2
I2C2_INDEX,
#endif
};
#define i2c_dbg rt_kprintf
struct lpc_i2c_bus
{
struct rt_i2c_bus_device parent;
LPI2C_Type *I2C;
clock_attach_id_t clock_attach_id;
clock_div_name_t clock_div_name;
clock_name_t clock_src;
uint32_t baud;
char *name;
};
struct lpc_i2c_bus lpc_obj[] =
{
#ifdef BSP_USING_I2C0
{
.I2C = LPI2C0,
.baud = 100000U,
.clock_attach_id = kFRO12M_to_FLEXCOMM0,
.clock_div_name = kCLOCK_DivFlexcom0Clk,
.clock_src = kCLOCK_Fro12M,
.name = "i2c0",
},
#endif
#ifdef BSP_USING_I2C1
{
.I2C = LPI2C1,
.baud = 100000U,
.clock_attach_id = kFRO12M_to_FLEXCOMM1,
.clock_div_name = kCLOCK_DivFlexcom1Clk,
.clock_src = kCLOCK_Fro12M,
.name = "i2c1",
},
#endif
#ifdef BSP_USING_I2C2
{
.I2C = LPI2C2,
.baud = 100000U,
.clock_attach_id = kFRO12M_to_FLEXCOMM2,
.clock_div_name = kCLOCK_DivFlexcom2Clk,
.clock_src = kCLOCK_Fro12M,
.name = "i2c2",
},
#endif
};
static rt_ssize_t lpc_i2c_xfer(struct rt_i2c_bus_device *bus, struct rt_i2c_msg msgs[], rt_uint32_t num)
{
struct rt_i2c_msg *msg;
lpi2c_master_transfer_t xfer = {0};
rt_uint32_t i;
rt_ssize_t ret = 0;
struct lpc_i2c_bus *lpc_i2c = (struct lpc_i2c_bus *)bus;
for (i = 0; i < num; i++)
{
msg = &msgs[i];
if (msg->flags & RT_I2C_RD)
{
xfer.slaveAddress = msg->addr;
xfer.direction = kLPI2C_Read;
xfer.subaddress = 0;
xfer.subaddressSize = 0;
xfer.data = msg->buf;
xfer.dataSize = msg->len;
if(i != 0)
xfer.flags = kLPI2C_TransferRepeatedStartFlag;
else
xfer.flags = kLPI2C_TransferDefaultFlag;
if (LPI2C_MasterTransferBlocking(lpc_i2c->I2C, &xfer) != kStatus_Success)
{
i2c_dbg("i2c bus read failed!\n");
return i;
}
}
else
{
xfer.slaveAddress = msg->addr;
xfer.direction = kLPI2C_Write;
xfer.subaddress = 0;
xfer.subaddressSize = 0;
xfer.data = msg->buf;
xfer.dataSize = msg->len;
if(i == 0)
xfer.flags = kLPI2C_TransferNoStopFlag;
else
xfer.flags = kLPI2C_TransferDefaultFlag;
if (LPI2C_MasterTransferBlocking(lpc_i2c->I2C, &xfer) != kStatus_Success)
{
i2c_dbg("i2c bus write failed!\n");
return i;
}
}
}
ret = i;
return ret;
}
static const struct rt_i2c_bus_device_ops i2c_ops =
{
lpc_i2c_xfer,
RT_NULL,
RT_NULL
};
int rt_hw_i2c_init(void)
{
int i;
lpi2c_master_config_t masterConfig;
for(i=0; i<ARRAY_SIZE(lpc_obj); i++)
{
CLOCK_SetClkDiv(lpc_obj[i].clock_div_name, 1u);
CLOCK_AttachClk(lpc_obj[i].clock_attach_id);
LPI2C_MasterGetDefaultConfig(&masterConfig);
masterConfig.baudRate_Hz = lpc_obj[i].baud;
LPI2C_MasterInit(lpc_obj[i].I2C, &masterConfig, CLOCK_GetFreq(lpc_obj[i].clock_src));
lpc_obj[i].parent.ops = &i2c_ops;
rt_i2c_bus_device_register(&lpc_obj[i].parent, lpc_obj[i].name);
}
return RT_EOK;
}
INIT_DEVICE_EXPORT(rt_hw_i2c_init);
#endif /* RT_USING_I2C */
|
