1 /*
2 * Copyright (c) 2006-2023, RT-Thread Development Team
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 *
6 * Change Logs:
7 * Date Author Email Notes
8 * 2022-04-11 Kevin.Liu kevin.liu.mchp@gmail.com First Release
9 */
10
11 #include <rtthread.h>
12 #include <rtdevice.h>
13
14 #include <atmel_start.h>
15
16 #ifdef SAM_I2C_EXAMPLE
17
18 struct sam_i2c_bus
19 {
20 struct rt_i2c_bus_device parent;
21 struct i2c_m_sync_desc *i2c_desc;
22 char *device_name;
23 };
24
25 #define I2CBUS_NAME "i2c0"
26
27 static struct sam_i2c_bus sam_i2c0 =
28 {
29 .i2c_desc = &I2C_0,
30 .device_name = I2CBUS_NAME,
31 };
32
33 static rt_ssize_t sam_i2c_master_xfer(struct rt_i2c_bus_device *bus,
34 struct rt_i2c_msg msgs[],
35 rt_uint32_t num);
36 static rt_ssize_t sam_i2c_slave_xfer(struct rt_i2c_bus_device *bus,
37 struct rt_i2c_msg msgs[],
38 rt_uint32_t num);
39 static rt_err_t sam_i2c_bus_control(struct rt_i2c_bus_device *bus,
40 int cmd, void *args);
41
42 static const struct rt_i2c_bus_device_ops sam_i2c_ops =
43 {
44 .master_xfer = sam_i2c_master_xfer,
45 .slave_xfer = sam_i2c_slave_xfer,
46 .i2c_bus_control = sam_i2c_bus_control,
47 };
48
sam_i2c_update_control(struct rt_i2c_msg * src,struct _i2c_m_msg * dest)49 static inline void sam_i2c_update_control(struct rt_i2c_msg *src,
50 struct _i2c_m_msg *dest)
51 {
52 dest->len = (int32_t)src->len;
53 dest->addr = src->addr;
54 dest->buffer = src->buf;
55
56 /* Get I2C message R/W attribute first */
57 dest->flags = dest->flags & 0x0001;
58
59 if (dest->flags & RT_I2C_ADDR_10BIT)
60 dest->flags |= I2C_M_TEN;
61 else
62 dest->flags |= I2C_M_SEVEN;
63 }
64
sam_i2c_master_xfer(struct rt_i2c_bus_device * bus,struct rt_i2c_msg msgs[],rt_uint32_t num)65 static rt_ssize_t sam_i2c_master_xfer(struct rt_i2c_bus_device *bus,
66 struct rt_i2c_msg msgs[],
67 rt_uint32_t num)
68 {
69 struct sam_i2c_bus *sam_i2c = (struct sam_i2c_bus *)bus;
70 struct _i2c_m_msg i2c_msg;
71 rt_size_t i;
72
73 RT_ASSERT(bus != RT_NULL);
74
75 for (i = 0; i < num; i++)
76 {
77 sam_i2c_update_control(&msgs[i], &i2c_msg);
78 if (i2c_m_sync_transfer(sam_i2c->i2c_desc, &i2c_msg) != 0)
79 break;
80 }
81
82 return i;
83 }
84
sam_i2c_slave_xfer(struct rt_i2c_bus_device * bus,struct rt_i2c_msg msgs[],rt_uint32_t num)85 static rt_ssize_t sam_i2c_slave_xfer(struct rt_i2c_bus_device *bus,
86 struct rt_i2c_msg msgs[],
87 rt_uint32_t num)
88 {
89 return 0;
90 }
91
sam_i2c_bus_control(struct rt_i2c_bus_device * bus,int cmd,void * args)92 static rt_err_t sam_i2c_bus_control(struct rt_i2c_bus_device *bus,
93 int cmd,
94 void *args)
95 {
96 return -RT_ERROR;
97 struct sam_i2c_bus *sam_i2c = (struct sam_i2c_bus *)bus;
98
99 RT_ASSERT(bus != RT_NULL);
100
101 switch (cmd)
102 {
103 case RT_I2C_DEV_CTRL_CLK:
104 i2c_m_sync_set_baudrate(sam_i2c->i2c_desc, 0, *(rt_uint32_t *)args);
105 break;
106 default:
107 return -RT_EIO;
108 }
109
110 return RT_EOK;
111 }
112
rt_hw_i2c_init(void)113 int rt_hw_i2c_init(void)
114 {
115 rt_i2c_bus_device_register(&sam_i2c0.parent, sam_i2c0.device_name);
116 return 0;
117 }
118 #ifdef RT_USING_COMPONENTS_INIT
119 INIT_BOARD_EXPORT(rt_hw_i2c_init);
120 #endif
121 #endif
122 /*@}*/
123