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+/*
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+ * Copyright (c) 2006-2023, RT-Thread Development Team
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+ *
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+ * SPDX-License-Identifier: Apache-2.0
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+ *
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+ * Change Logs:
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+ * Date Author Notes
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+ *2023-03-28 Zxy first version
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+ */
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+#ifdef RT_USING_I2C
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+#include "drv_hw_i2c.h"
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+#include "driver/i2c.h"//bsp/ESP32_C3/packages/ESP-IDF-latest/components/driver/include/driver/i2c.h
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+#include "hal/i2c_types.h"//bsp/ESP32_C3/packages/ESP-IDF-latest/tools/mocks/hal/include/hal/i2c_types.h
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+#include "esp_err.h"
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+//#include "portmacro.h"//bsp/ESP32_C3/packages/FreeRTOS_Wrapper-latest/FreeRTOS/portable/rt-thread/portmacro.h
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+
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+struct esp32_i2c
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+{
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+ struct rt_i2c_bus_device bus;
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+
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+ i2c_config_t *base;
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+
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+ char *device_name;
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+};
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+
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+// #if defined(BSP_USING_I2C0)
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+static struct esp32_i2c i2c0 = {0};
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+// #endif
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+
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+static rt_size_t _master_xfer(struct rt_i2c_bus_device *bus, struct rt_i2c_msg msgs[], rt_uint32_t num)
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+{
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+ i2c_cmd_handle_t cmd;//创建流程
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+ rt_size_t ret = (0);
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+ rt_uint32_t index = 0;
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+ // struct esp32_i2c *esp32_i2c = RT_NULL;
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+ struct rt_i2c_msg *msg = RT_NULL;
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+ i2c_rw_t direction;//w-0 r-1
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+ esp_err_t result = ESP_OK;
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+
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+ RT_ASSERT(bus != RT_NULL);
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+
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+ // esp32_i2c = (struct esp32_i2c *)bus;
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+
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+ for(index = 0; index < num; index++)
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+ {
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+ msg = &msgs[index];
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+ direction = ((msg->flags & RT_I2C_RD) ? I2C_MASTER_READ : I2C_MASTER_WRITE);
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+
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+ if (!(msg->flags & RT_I2C_NO_START))
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+ {
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+ /* Start condition and slave address. */
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+ cmd = i2c_cmd_link_create();//创建流程
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+ i2c_master_start(cmd);//启动流程录入
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+ 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
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+ i2c_master_stop(cmd);//流程录入完毕
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+ ret = i2c_master_cmd_begin(I2C_NUMBER(0), cmd, 1000 / portTICK_PERIOD_MS);//执行流程
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+ i2c_cmd_link_delete(cmd);//删除流程任务
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+ if (ret != ESP_OK) return ret;
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+ }
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+
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+ if (result == ESP_OK)
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+ {
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+ if (direction == I2C_MASTER_WRITE)
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+ {
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+ /* Transmit data. */
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+ cmd = i2c_cmd_link_create();//创建流程
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+ i2c_master_start(cmd);//启动流程录入
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+ result = i2c_master_write_byte(cmd, msg->buf, ACK_CHECK_EN);
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+ i2c_master_stop(cmd);//流程录入完毕
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+ ret = i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, 1000 / portTICK_PERIOD_MS);//执行流程
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+ i2c_cmd_link_delete(cmd);//删除流程任务
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+ }
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+ else
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+ {
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+ /* Receive Data. */
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+ cmd = i2c_cmd_link_create();//创建流程
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+ i2c_master_start(cmd);//启动流程录入
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+ result = i2c_master_read_byte(cmd, msg->buf, ACK_VAL);
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+ i2c_master_stop(cmd);//流程录入完毕
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+ ret = i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, 1000 / portTICK_PERIOD_MS);//执行流程
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+ i2c_cmd_link_delete(cmd);//删除流程任务
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+ }
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+ }
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+ }
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+
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+ if (result == ESP_OK)
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+ {
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+ ret = index;
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+ }
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+
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+ return ret;
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+}
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+
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+static rt_size_t _slave_xfer(struct rt_i2c_bus_device *bus, struct rt_i2c_msg msgs[], rt_uint32_t num)
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+{
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+ return -RT_ENOSYS;
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+}
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+
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+static rt_err_t _i2c_bus_control(struct rt_i2c_bus_device *bus, rt_uint32_t cmd, rt_uint32_t arg)
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+{
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+ return -RT_EINVAL;
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+}
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+
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+static const struct rt_i2c_bus_device_ops i2c_ops =
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+{
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+ _master_xfer,
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+ _slave_xfer,
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+ _i2c_bus_control,
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+};
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+
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+int rt_hw_i2c_init(void)
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+{
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+ i2c0.base = &i2c0;
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+ i2c0.device_name = "i2c0";
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+ i2c0.bus.ops = &i2c_ops;
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+ int i2c_master_port = I2C_MASTER_NUM;//iic0
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+ i2c_config_t conf = {
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+ .mode = I2C_MODE_MASTER,
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+ .sda_io_num = I2C_MASTER_SDA_IO,
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+ .sda_pullup_en = GPIO_PULLUP_ENABLE,
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+ .scl_io_num = I2C_MASTER_SCL_IO,
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+ .scl_pullup_en = GPIO_PULLUP_ENABLE,
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+ .master.clk_speed = 100000,
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+ // .clk_flags = 0, /*!< Optional, you can use I2C_SCLK_SRC_FLAG_* flags to choose i2c source clock here. */
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+ };
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+
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+ i2c_param_config(i2c_master_port, &conf);//配置完成
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+ i2c_driver_install(i2c_master_port, conf.mode, 0, 0, 0);// I2C 设备的初始化
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+ rt_i2c_bus_device_register(&i2c0.bus, i2c0.device_name);
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+ return RT_EOK;
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+}
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+INIT_BOARD_EXPORT(rt_hw_i2c_init);
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+#endif /* RT_USING_I2C */
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ZXY_LINUX