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 Notes
8 *2023-03-28 Zxy first version
9 */
10
11 #include "drv_hw_i2c.h"
12 #include "driver/i2c.h"//bsp/ESP32_C3/packages/ESP-IDF-latest/components/driver/include/driver/i2c.h
13 #include "hal/i2c_types.h"//bsp/ESP32_C3/packages/ESP-IDF-latest/tools/mocks/hal/include/hal/i2c_types.h
14 #include "esp_err.h"
15 //#include "portmacro.h"//bsp/ESP32_C3/packages/FreeRTOS_Wrapper-latest/FreeRTOS/portable/rt-thread/portmacro.h
16 #ifdef BSP_USING_HW_I2C
17 struct esp32_i2c
18 {
19 struct rt_i2c_bus_device bus;
20
21 i2c_config_t *base;
22
23 char *device_name;
24 };
25
26 // #if defined(BSP_USING_I2C0)
27 static struct esp32_i2c i2c0 = {0};
28 // #endif
29
_master_xfer(struct rt_i2c_bus_device * bus,struct rt_i2c_msg msgs[],rt_uint32_t num)30 static rt_size_t _master_xfer(struct rt_i2c_bus_device *bus, struct rt_i2c_msg msgs[], rt_uint32_t num)
31 {
32 i2c_cmd_handle_t cmd;//创建流程
33 rt_size_t ret = (0);
34 rt_uint32_t index = 0;
35 // struct esp32_i2c *esp32_i2c = RT_NULL;
36 struct rt_i2c_msg *msg = RT_NULL;
37 i2c_rw_t direction;//w-0 r-1
38 esp_err_t result = ESP_OK;
39
40 RT_ASSERT(bus != RT_NULL);
41
42 // esp32_i2c = (struct esp32_i2c *)bus;
43
44 for(index = 0; index < num; index++)
45 {
46 msg = &msgs[index];
47 direction = ((msg->flags & RT_I2C_RD) ? I2C_MASTER_READ : I2C_MASTER_WRITE);
48
49 if (!(msg->flags & RT_I2C_NO_START))
50 {
51 /* Start condition and slave address. */
52 cmd = i2c_cmd_link_create();//创建流程
53 i2c_master_start(cmd);//启动流程录入
54 result = i2c_master_write_byte(cmd, msg->addr << 1 | WRITE_BIT, ACK_CHECK_EN);//发送起始信号和从设备地址
55 i2c_master_stop(cmd);//流程录入完毕
56 ret = i2c_master_cmd_begin(I2C_NUMBER(0), cmd, 1000 / portTICK_PERIOD_MS);//执行流程
57 i2c_cmd_link_delete(cmd);//删除流程任务
58 if (ret != ESP_OK) return ret;
59 }
60
61 if (result == ESP_OK)
62 {
63 if (direction == I2C_MASTER_WRITE)
64 {
65 /* Transmit data. */
66 cmd = i2c_cmd_link_create();//创建流程
67 i2c_master_start(cmd);//启动流程录入
68 result = i2c_master_write_byte(cmd, msg->buf, ACK_CHECK_EN);
69 i2c_master_stop(cmd);//流程录入完毕
70 ret = i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, 1000 / portTICK_PERIOD_MS);//执行流程
71 i2c_cmd_link_delete(cmd);//删除流程任务
72 }
73 else
74 {
75 /* Receive Data. */
76 cmd = i2c_cmd_link_create();//创建流程
77 i2c_master_start(cmd);//启动流程录入
78 result = i2c_master_read_byte(cmd, msg->buf, ACK_VAL);
79 i2c_master_stop(cmd);//流程录入完毕
80 ret = i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, 1000 / portTICK_PERIOD_MS);//执行流程
81 i2c_cmd_link_delete(cmd);//删除流程任务
82 }
83 }
84 }
85
86 if (result == ESP_OK)
87 {
88 ret = index;
89 }
90
91 return ret;
92 }
93
_slave_xfer(struct rt_i2c_bus_device * bus,struct rt_i2c_msg msgs[],rt_uint32_t num)94 static rt_size_t _slave_xfer(struct rt_i2c_bus_device *bus, struct rt_i2c_msg msgs[], rt_uint32_t num)
95 {
96 return -RT_ENOSYS;
97 }
98
_i2c_bus_control(struct rt_i2c_bus_device * bus,int cmd,void * args)99 static rt_err_t _i2c_bus_control(struct rt_i2c_bus_device *bus, int cmd, void *args)
100 {
101 return -RT_EINVAL;
102 }
103
104 static const struct rt_i2c_bus_device_ops i2c_ops =
105 {
106 _master_xfer,
107 _slave_xfer,
108 _i2c_bus_control,
109 };
110
rt_hw_i2c_init(void)111 int rt_hw_i2c_init(void)
112 {
113 i2c0.base = &i2c0;
114 i2c0.device_name = "i2c0";
115 i2c0.bus.ops = &i2c_ops;
116 int i2c_master_port = I2C_MASTER_NUM;//iic0
117 i2c_config_t conf = {
118 .mode = I2C_MODE_MASTER,
119 .sda_io_num = I2C_MASTER_SDA_IO,
120 .sda_pullup_en = GPIO_PULLUP_ENABLE,
121 .scl_io_num = I2C_MASTER_SCL_IO,
122 .scl_pullup_en = GPIO_PULLUP_ENABLE,
123 .master.clk_speed = 100000,
124 // .clk_flags = 0, /*!< Optional, you can use I2C_SCLK_SRC_FLAG_* flags to choose i2c source clock here. */
125 };
126
127 i2c_param_config(i2c_master_port, &conf);//配置完成
128 i2c_driver_install(i2c_master_port, conf.mode, 0, 0, 0);// I2C 设备的初始化
129 rt_i2c_bus_device_register(&i2c0.bus, i2c0.device_name);
130 return RT_EOK;
131 }
132 INIT_BOARD_EXPORT(rt_hw_i2c_init);
133 #endif /* RT_USING_I2C */
134