402 lines
11 KiB
C
402 lines
11 KiB
C
/*
|
||
* Copyright (c) 2006-2024 RT-Thread Development Team
|
||
*
|
||
* SPDX-License-Identifier: Apache-2.0
|
||
*
|
||
* Change Logs:
|
||
* Date Author Notes
|
||
* 2012-04-25 weety first version
|
||
* 2021-04-20 RiceChen added support for bus control api
|
||
*/
|
||
|
||
#ifndef __DEV_I2C_H__
|
||
#define __DEV_I2C_H__
|
||
|
||
#include <rtthread.h>
|
||
/**
|
||
* @addtogroup Drivers RTTHREAD Driver
|
||
* @defgroup I2C I2C
|
||
*
|
||
* @brief I2C driver api
|
||
*
|
||
* <b>Example</b>
|
||
* @code {.c}
|
||
* #include <rtthread.h>
|
||
* #include <rtdevice.h>
|
||
*
|
||
* #define AHT10_I2C_BUS_NAME "i2c1" // 传感器连接的I2C总线设备名称
|
||
* #define AHT10_ADDR 0x38 // 从机地址
|
||
* #define AHT10_CALIBRATION_CMD 0xE1 // 校准命令
|
||
* #define AHT10_NORMAL_CMD 0xA8 // 一般命令
|
||
* #define AHT10_GET_DATA 0xAC // 获取数据命令
|
||
*
|
||
* static struct rt_i2c_bus_device *i2c_bus = RT_NULL; // I2C总线设备句柄
|
||
* static rt_bool_t initialized = RT_FALSE; // 传感器初始化状态
|
||
*
|
||
* // 写传感器寄存器
|
||
* static rt_err_t write_reg(struct rt_i2c_bus_device *bus, rt_uint8_t reg, rt_uint8_t *data)
|
||
* {
|
||
* rt_uint8_t buf[3];
|
||
* struct rt_i2c_msg msgs;
|
||
* rt_uint32_t buf_size = 1;
|
||
*
|
||
* buf[0] = reg; //cmd
|
||
* if (data != RT_NULL)
|
||
* {
|
||
* buf[1] = data[0];
|
||
* buf[2] = data[1];
|
||
* buf_size = 3;
|
||
* }
|
||
*
|
||
* msgs.addr = AHT10_ADDR;
|
||
* msgs.flags = RT_I2C_WR;
|
||
* msgs.buf = buf;
|
||
* msgs.len = buf_size;
|
||
*
|
||
* // 调用I2C设备接口传输数据
|
||
* if (rt_i2c_transfer(bus, &msgs, 1) == 1)
|
||
* {
|
||
* return RT_EOK;
|
||
* }
|
||
* else
|
||
* {
|
||
* return -RT_ERROR;
|
||
* }
|
||
* }
|
||
*
|
||
* // 读传感器寄存器数据
|
||
* static rt_err_t read_regs(struct rt_i2c_bus_device *bus, rt_uint8_t len, rt_uint8_t *buf)
|
||
* {
|
||
* struct rt_i2c_msg msgs;
|
||
*
|
||
* msgs.addr = AHT10_ADDR;
|
||
* msgs.flags = RT_I2C_RD;
|
||
* msgs.buf = buf;
|
||
* msgs.len = len;
|
||
*
|
||
* // 调用I2C设备接口传输数据
|
||
* if (rt_i2c_transfer(bus, &msgs, 1) == 1)
|
||
* {
|
||
* return RT_EOK;
|
||
* }
|
||
* else
|
||
* {
|
||
* return -RT_ERROR;
|
||
* }
|
||
* }
|
||
*
|
||
* static void read_temp_humi(float *cur_temp, float *cur_humi)
|
||
* {
|
||
* rt_uint8_t temp[6];
|
||
*
|
||
* write_reg(i2c_bus, AHT10_GET_DATA, RT_NULL); // 发送命令
|
||
* rt_thread_mdelay(400);
|
||
* read_regs(i2c_bus, 6, temp); // 获取传感器数据
|
||
*
|
||
* // 湿度数据转换
|
||
* *cur_humi = (temp[1] << 12 | temp[2] << 4 | (temp[3] & 0xf0) >> 4) * 100.0 / (1 << 20);
|
||
* // 温度数据转换
|
||
* *cur_temp = ((temp[3] & 0xf) << 16 | temp[4] << 8 | temp[5]) * 200.0 / (1 << 20) - 50;
|
||
* }
|
||
*
|
||
* static void aht10_init(const char *name)
|
||
* {
|
||
* rt_uint8_t temp[2] = {0, 0};
|
||
*
|
||
* // 查找I2C总线设备，获取I2C总线设备句柄
|
||
* i2c_bus = (struct rt_i2c_bus_device *)rt_device_find(name);
|
||
*
|
||
* if (i2c_bus == RT_NULL)
|
||
* {
|
||
* rt_kprintf("can't find %s device!\n", name);
|
||
* }
|
||
* else
|
||
* {
|
||
* write_reg(i2c_bus, AHT10_NORMAL_CMD, temp);
|
||
* rt_thread_mdelay(400);
|
||
*
|
||
* temp[0] = 0x08;
|
||
* temp[1] = 0x00;
|
||
* write_reg(i2c_bus, AHT10_CALIBRATION_CMD, temp);
|
||
* rt_thread_mdelay(400);
|
||
* initialized = RT_TRUE;
|
||
* }
|
||
* }
|
||
*
|
||
* static void i2c_aht10_sample(int argc, char *argv[])
|
||
* {
|
||
* float humidity, temperature;
|
||
* char name[RT_NAME_MAX];
|
||
*
|
||
* humidity = 0.0;
|
||
* temperature = 0.0;
|
||
*
|
||
* if (argc == 2)
|
||
* {
|
||
* rt_strncpy(name, argv[1], RT_NAME_MAX);
|
||
* }
|
||
* else
|
||
* {
|
||
* rt_strncpy(name, AHT10_I2C_BUS_NAME, RT_NAME_MAX);
|
||
* }
|
||
*
|
||
* if (!initialized)
|
||
* {
|
||
* // 传感器初始化
|
||
* aht10_init(name);
|
||
* }
|
||
* if (initialized)
|
||
* {
|
||
* // 读取温湿度数据
|
||
* read_temp_humi(&temperature, &humidity);
|
||
*
|
||
* rt_kprintf("read aht10 sensor humidity : %d.%d %%\n", (int)humidity, (int)(humidity * 10) % 10);
|
||
* if( temperature >= 0 )
|
||
* {
|
||
* rt_kprintf("read aht10 sensor temperature: %d.%d°C\n", (int)temperature, (int)(temperature * 10) % 10);
|
||
* }
|
||
* else
|
||
* {
|
||
* rt_kprintf("read aht10 sensor temperature: %d.%d°C\n", (int)temperature, (int)(-temperature * 10) % 10);
|
||
* }
|
||
* }
|
||
* else
|
||
* {
|
||
* rt_kprintf("initialize sensor failed!\n");
|
||
* }
|
||
* }
|
||
* // 导出到 msh 命令列表中
|
||
* MSH_CMD_EXPORT(i2c_aht10_sample, i2c aht10 sample);
|
||
* @endcode
|
||
*
|
||
* @ingroup Drivers
|
||
*/
|
||
|
||
/*!
|
||
* @addtogroup I2C
|
||
* @{
|
||
*/
|
||
#ifdef __cplusplus
|
||
extern "C" {
|
||
#endif
|
||
|
||
#define RT_I2C_WR 0x0000 /*!< i2c wirte flag */
|
||
#define RT_I2C_RD (1u << 0) /*!< i2c read flag */
|
||
#define RT_I2C_ADDR_10BIT (1u << 2) /*!< this is a ten bit chip address */
|
||
#define RT_I2C_NO_START (1u << 4) /*!< do not generate START condition */
|
||
#define RT_I2C_IGNORE_NACK (1u << 5) /*!< ignore NACK from slave */
|
||
#define RT_I2C_NO_READ_ACK (1u << 6) /* when I2C reading, we do not ACK */
|
||
#define RT_I2C_NO_STOP (1u << 7) /*!< do not generate STOP condition */
|
||
|
||
#define RT_I2C_DEV_CTRL_10BIT (RT_DEVICE_CTRL_BASE(I2CBUS) + 0x01)
|
||
#define RT_I2C_DEV_CTRL_ADDR (RT_DEVICE_CTRL_BASE(I2CBUS) + 0x02)
|
||
#define RT_I2C_DEV_CTRL_TIMEOUT (RT_DEVICE_CTRL_BASE(I2CBUS) + 0x03)
|
||
#define RT_I2C_DEV_CTRL_RW (RT_DEVICE_CTRL_BASE(I2CBUS) + 0x04)
|
||
#define RT_I2C_DEV_CTRL_CLK (RT_DEVICE_CTRL_BASE(I2CBUS) + 0x05)
|
||
#define RT_I2C_DEV_CTRL_UNLOCK (RT_DEVICE_CTRL_BASE(I2CBUS) + 0x06)
|
||
#define RT_I2C_DEV_CTRL_GET_STATE (RT_DEVICE_CTRL_BASE(I2CBUS) + 0x07)
|
||
#define RT_I2C_DEV_CTRL_GET_MODE (RT_DEVICE_CTRL_BASE(I2CBUS) + 0x08)
|
||
#define RT_I2C_DEV_CTRL_GET_ERROR (RT_DEVICE_CTRL_BASE(I2CBUS) + 0x09)
|
||
|
||
/**
|
||
* @brief I2C Private Data
|
||
*/
|
||
struct rt_i2c_priv_data
|
||
{
|
||
struct rt_i2c_msg *msgs;
|
||
rt_size_t number;
|
||
};
|
||
|
||
/**
|
||
* @brief I2C Message
|
||
*/
|
||
struct rt_i2c_msg
|
||
{
|
||
rt_uint16_t addr;
|
||
rt_uint16_t flags;
|
||
rt_uint16_t len;
|
||
rt_uint8_t *buf;
|
||
};
|
||
|
||
struct rt_i2c_bus_device;
|
||
|
||
/**
|
||
* @brief I2C Bus Device Operations
|
||
*/
|
||
struct rt_i2c_bus_device_ops
|
||
{
|
||
rt_ssize_t (*master_xfer)(struct rt_i2c_bus_device *bus,
|
||
struct rt_i2c_msg msgs[],
|
||
rt_uint32_t num);
|
||
rt_ssize_t (*slave_xfer)(struct rt_i2c_bus_device *bus,
|
||
struct rt_i2c_msg msgs[],
|
||
rt_uint32_t num);
|
||
rt_err_t (*i2c_bus_control)(struct rt_i2c_bus_device *bus,
|
||
int cmd,
|
||
void *args);
|
||
};
|
||
|
||
/**
|
||
* @brief I2C Bus Device
|
||
*/
|
||
struct rt_i2c_bus_device
|
||
{
|
||
struct rt_device parent;
|
||
const struct rt_i2c_bus_device_ops *ops;
|
||
rt_uint16_t flags;
|
||
struct rt_mutex lock;
|
||
rt_uint32_t timeout;
|
||
rt_uint32_t retries;
|
||
void *priv;
|
||
};
|
||
|
||
/**
|
||
* @brief I2C Client
|
||
*/
|
||
struct rt_i2c_client
|
||
{
|
||
#ifdef RT_USING_DM
|
||
struct rt_device parent;
|
||
|
||
const char *name;
|
||
const struct rt_i2c_device_id *id;
|
||
const struct rt_ofw_node_id *ofw_id;
|
||
#endif
|
||
struct rt_i2c_bus_device *bus;
|
||
rt_uint16_t client_addr;
|
||
};
|
||
|
||
#ifdef RT_USING_DM
|
||
struct rt_i2c_device_id
|
||
{
|
||
char name[20];
|
||
void *data;
|
||
};
|
||
|
||
struct rt_i2c_driver
|
||
{
|
||
struct rt_driver parent;
|
||
|
||
const struct rt_i2c_device_id *ids;
|
||
const struct rt_ofw_node_id *ofw_ids;
|
||
|
||
rt_err_t (*probe)(struct rt_i2c_client *client);
|
||
rt_err_t (*remove)(struct rt_i2c_client *client);
|
||
rt_err_t (*shutdown)(struct rt_i2c_client *client);
|
||
};
|
||
|
||
rt_err_t rt_i2c_driver_register(struct rt_i2c_driver *driver);
|
||
rt_err_t rt_i2c_device_register(struct rt_i2c_client *client);
|
||
|
||
#define RT_I2C_DRIVER_EXPORT(driver) RT_DRIVER_EXPORT(driver, i2c, BUILIN)
|
||
#endif /* RT_USING_DM */
|
||
|
||
/**
|
||
* @brief I2C Bus Device Initialization
|
||
*
|
||
* @param bus the I2C bus device
|
||
* @param name the name of I2C bus device
|
||
*
|
||
* @return rt_err_t error code
|
||
*/
|
||
rt_err_t rt_i2c_bus_device_device_init(struct rt_i2c_bus_device *bus,
|
||
const char *name);
|
||
|
||
/**
|
||
* @brief I2C Bus Device Register
|
||
*
|
||
* @param bus the I2C bus device
|
||
* @param bus_name the name of I2C bus device
|
||
*
|
||
* @return rt_err_t error code
|
||
*/
|
||
rt_err_t rt_i2c_bus_device_register(struct rt_i2c_bus_device *bus,
|
||
const char *bus_name);
|
||
|
||
/**
|
||
* @brief I2C Bus Device Find
|
||
*
|
||
* @param bus_name the name of I2C bus device
|
||
*
|
||
* @return rt_i2c_bus_device the I2C bus device
|
||
*/
|
||
struct rt_i2c_bus_device *rt_i2c_bus_device_find(const char *bus_name);
|
||
|
||
/**
|
||
* @brief I2C data transmission.
|
||
*
|
||
* @param bus the I2C bus device
|
||
* @param msgs the I2C message list
|
||
* @param num the number of I2C message
|
||
*
|
||
* @return rt_ssize_t the actual length of transmitted
|
||
*/
|
||
rt_ssize_t rt_i2c_transfer(struct rt_i2c_bus_device *bus,
|
||
struct rt_i2c_msg msgs[],
|
||
rt_uint32_t num);
|
||
|
||
/**
|
||
* @brief I2C Control
|
||
*
|
||
* @param bus the I2C bus device
|
||
* @param cmd the I2C control command
|
||
* @param args the I2C control arguments
|
||
*
|
||
* @return rt_err_t error code
|
||
*/
|
||
rt_err_t rt_i2c_control(struct rt_i2c_bus_device *bus,
|
||
int cmd,
|
||
void *args);
|
||
|
||
/**
|
||
* @brief I2C Master Send
|
||
*
|
||
* @param bus the I2C bus device
|
||
* @param addr the I2C slave address
|
||
* @param flags the I2C flags
|
||
* @param buf the I2C send buffer
|
||
* @param count the I2C send buffer length
|
||
*
|
||
* @return rt_ssize_t the actual length of transmitted
|
||
*/
|
||
rt_ssize_t rt_i2c_master_send(struct rt_i2c_bus_device *bus,
|
||
rt_uint16_t addr,
|
||
rt_uint16_t flags,
|
||
const rt_uint8_t *buf,
|
||
rt_uint32_t count);
|
||
|
||
/**
|
||
* @brief I2C Master Receive
|
||
*
|
||
* @param bus the I2C bus device
|
||
* @param addr the I2C slave address
|
||
* @param flags the I2C flags
|
||
* @param buf the I2C receive buffer
|
||
* @param count the I2C receive buffer length
|
||
*
|
||
* @return rt_ssize_t the actual length of received
|
||
*/
|
||
rt_ssize_t rt_i2c_master_recv(struct rt_i2c_bus_device *bus,
|
||
rt_uint16_t addr,
|
||
rt_uint16_t flags,
|
||
rt_uint8_t *buf,
|
||
rt_uint32_t count);
|
||
|
||
rt_inline rt_err_t rt_i2c_bus_lock(struct rt_i2c_bus_device *bus, rt_tick_t timeout)
|
||
{
|
||
return rt_mutex_take(&bus->lock, timeout);
|
||
}
|
||
|
||
rt_inline rt_err_t rt_i2c_bus_unlock(struct rt_i2c_bus_device *bus)
|
||
{
|
||
return rt_mutex_release(&bus->lock);
|
||
}
|
||
|
||
#ifdef __cplusplus
|
||
}
|
||
#endif
|
||
|
||
/*! @}*/
|
||
|
||
#endif
|