1 /*
2 * Copyright (c) 2006-2020, RT-Thread Development Team
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 *
6 * Change Logs:
7 * Date Author Notes
8 * 2021-02-26 Jackistang first version
9 *
10 */
11
12 #include "drv_i2c.h"
13 #include "drivers/dev_i2c.h"
14 #include <rtdevice.h>
15 #include <rtthread.h>
16 #include "board.h"
17
18 #ifdef RT_USING_I2C
19
20 #if !defined(BSP_USING_I2C0) && !defined(BSP_USING_I2C1)
21 #error "Please define at least one BSP_USING_I2Cx"
22 /* this driver can be disabled at menuconfig -> Hardware Drivers Config -> On-chip Peripheral Drivers -> Enable I2C */
23 #endif
24
25 #define DBG_LEVEL DBG_LOG
26 #include <rtdbg.h>
27 #define LOG_TAG "drv.i2c"
28
29 /* mxc config class */
30 struct mxc_i2c_config
31 {
32 const char *name;
33 mxc_i2c_regs_t *i2c_periph;
34 i2c_speed_t speed;
35 IRQn_Type irq_type;
36 };
37
38 struct mxc_i2c
39 {
40 struct rt_i2c_bus_device bus;
41 struct mxc_i2c_config *config;
42 };
43
44 static struct mxc_i2c_config i2c_config[] =
45 {
46 #ifdef BSP_USING_I2C0
47 {
48 .name = "i2c0",
49 .i2c_periph = MXC_I2C_GET_I2C(0),
50 .irq_type = MXC_I2C_GET_IRQ(0),
51 .speed = I2C_STD_MODE,
52 /*I2C_STD_MODE: 100KHz, I2C_FAST_MODE: 400KHz, I2C_FASTPLUS_MODE: 1MHz, I2C_HS_MODE: 3.4MHz */
53 },
54 #endif
55 #ifdef BSP_USING_I2C1
56 {
57 .name = "i2c1",
58 .i2c_periph = MXC_I2C_GET_I2C(1),
59 .irq_type = MXC_I2C_GET_IRQ(1),
60 .speed = I2C_STD_MODE,
61 /*I2C_STD_MODE: 100KHz, I2C_FAST_MODE: 400KHz, I2C_FASTPLUS_MODE: 1MHz, I2C_HS_MODE: 3.4MHz */
62 },
63 #endif
64 };
65
66 static struct mxc_i2c i2c_obj[sizeof(i2c_config) / sizeof(i2c_config[0])] = {0};
67
68
mxc_i2c_mst_xfer(struct rt_i2c_bus_device * bus,struct rt_i2c_msg msgs[],rt_uint32_t num)69 static rt_ssize_t mxc_i2c_mst_xfer(struct rt_i2c_bus_device *bus,
70 struct rt_i2c_msg msgs[],
71 rt_uint32_t num)
72 {
73 rt_uint32_t i, ret;
74 rt_uint16_t addr;
75 int error;
76 int restart = 0;
77 struct rt_i2c_msg *msg;
78 struct mxc_i2c *obj = (struct mxc_i2c *)bus;
79
80 for (i = 0; i < num; i++)
81 {
82 msg = &msgs[i];
83
84 if (msg->flags & RT_I2C_ADDR_10BIT || msg->flags & RT_I2C_NO_START || msg->flags & RT_I2C_IGNORE_NACK || msg->flags & RT_I2C_NO_READ_ACK)
85 {
86 LOG_E("Not support RT_I2C_ADDR_10BIT or RT_I2C_NO_START or RT_I2C_IGNORE_NACK or RT_I2C_NO_READ_ACK");
87 return 0;
88 }
89
90 if (msg->flags & RT_I2C_NO_STOP)
91 {
92 restart = 1;
93 }
94
95 if (msg->flags & RT_I2C_RD)
96 {
97 addr = msg->addr << 1;
98 if ((error = I2C_MasterRead(obj->config->i2c_periph, (uint8_t)addr, msg->buf, msg->len, restart)) != msg->len)
99 {
100 LOG_E("Error writing %d", error);
101 return 0;
102 }
103 }
104 else /* RT_I2C_WR */
105 {
106 addr = msg->addr << 1;
107 if ((error = I2C_MasterWrite(obj->config->i2c_periph, (uint8_t)addr, msg->buf, msg->len, restart)) != msg->len)
108 {
109 LOG_E("Error writing %d", error);
110 return 0;
111 }
112 }
113 }
114 ret = i;
115
116 return ret;
117 }
118
119 static const struct rt_i2c_bus_device_ops mxc_i2c_ops =
120 {
121 mxc_i2c_mst_xfer,
122 RT_NULL,
123 RT_NULL,
124 };
125
rt_hw_i2c_init(void)126 int rt_hw_i2c_init(void)
127 {
128 rt_size_t obj_num;
129 int index;
130 rt_err_t result = 0;
131
132 #ifdef BSP_USING_I2C0
133 NVIC_EnableIRQ(I2C0_IRQn);
134 #endif
135 #ifdef BSP_USING_I2C1
136 NVIC_EnableIRQ(I2C1_IRQn);
137 #endif
138
139 obj_num = sizeof(i2c_obj) / sizeof(struct mxc_i2c);
140 for (index = 0; index < obj_num; index++)
141 {
142 /* init i2c object */
143 i2c_obj[index].config = &i2c_config[index];
144 i2c_obj[index].bus.ops = &mxc_i2c_ops;
145
146 /* init i2c device */
147 I2C_Shutdown(i2c_config[index].i2c_periph);
148 I2C_Init(i2c_config[index].i2c_periph, i2c_config[index].speed, RT_NULL);
149
150 /* register i2c device */
151 result = rt_i2c_bus_device_register(&i2c_obj[index].bus,
152 i2c_obj[index].config->name
153 );
154 RT_ASSERT(result == RT_EOK);
155 }
156
157 return 0;
158 }
159 INIT_DEVICE_EXPORT(rt_hw_i2c_init);
160
161 #ifdef BSP_USING_I2C0
I2C0_IRQHandler(void)162 void I2C0_IRQHandler(void)
163 {
164 rt_interrupt_enter();
165 I2C_Handler(MXC_I2C0);
166 rt_interrupt_leave();
167 }
168 #endif
169
170 #ifdef BSP_USING_I2C1
I2C1_IRQHandler(void)171 void I2C1_IRQHandler(void)
172 {
173 rt_interrupt_enter();
174 I2C_Handler(MXC_I2C1);
175 rt_interrupt_leave();
176 }
177 #endif
178
179 #endif /* RT_USING_I2C */
180