2022-11-10 22:22:48 +08:00
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# I2C 驱动程序
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## 1. 概述
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- I2C 是一种串行同步半双工通信协议，总线上可以同时挂载多个主机和从机。I2C 总线由串行数据线 (SDA) 和串行时钟线 (SCL) 线构成。这些线都需要上拉电阻。
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- I2C 具有简单且制造成本低廉等优点，主要用于低速外围设备的短距离通信（一英尺以内）。
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2023-05-11 10:25:21 +08:00
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- I2C 驱动支持的平台包括 FT2000/4、D2000、E2000。
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2022-11-10 22:22:48 +08:00
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## 2. 驱动功能
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I2C 驱动程序管理在 I2C 总线上设备的通信，该驱动程序具备以下功能：
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- 在主机模式下读写字节
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- 支持从机模式
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## 3. 使用方法
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以下部分将指导您完成 I2C 驱动的硬件配置：
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- 1. I2C驱动支持 FT2000/4, D2000和E2000，在FT2000/4上完成测试
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- 2. FT2000/4, D2000上，使用I2C驱动需要打开IO复用，I2C0的引脚默认设置为给I2C使用，I2C1/I2C2/I2C3需要先设置IO复用才能使用
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- 3. E2000上，使用MIO的的IIC驱动需要打开MIO配置功能寄存器，设置IIC模式，引脚复用设置为MIO功能，才能使用
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- 4. FT2000/4, D2000上，I2C的参考时钟为48MHz,在E2000上，I2C的参考时钟为50MHz 不支持修改设置
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以下部分将指导您完成 I2C 驱动的软件配置：
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- 1. 配置驱动程序，新建应用工程，使能I2C驱动模块
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- 2. 设置配置参数，选择为 I2C 主机还是从机，调整默认的 I2C 通信参数（如时序、位序等）
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- 3. 配置中断服务
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- 4. 处理错误码
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- 5. 去使能驱动程序
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## 4. 应用示例
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### [fi2c_eeprom](../../../baremetal/example/peripheral/i2c/fi2c_eeprom/README.md)
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### [fi2c_slave](../../../baremetal/example/peripheral/i2c/fi2c_master_slave/README.md)
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## 5. API参考
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### 5.1. 用户数据结构
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- drivers/i2c/fi2c/fi2c.h
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```c
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typedef struct
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{
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u32 instance_id; /* Device instance id */
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uintptr base_addr; /* Device base address */
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u32 irq_num; /* Device intrrupt id */
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u32 irq_prority; /* Device intrrupt priority */
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u32 ref_clk_hz; /* Input reference clock frequency in Hz */
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u32 work_mode; /* Device work mode Slave or Master */
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u32 slave_addr; /* Slave Address writing/reading to/from */
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boolean use_7bit_addr; /* Slave in-chip address offset in 7bit or 10bit */
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u32 speed_rate; /* I2C speed rate */
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} FI2cConfig; /* Device configure setting */
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```
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- I2C驱动实例配置
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```c
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typedef struct
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{
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FI2cConfig config; /* Current active configs */
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u32 is_ready; /* Device is initialized and ready */
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volatile u32 status;
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FI2cFrameTX txframe;
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FI2cFrameRX rxframe;
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/** only apply to master device **/
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/* Master intrrupt handler */
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FI2cEvtHandler master_evt_handlers[FI2C_MASTER_INTR_EVT_NUM];
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/** only apply to slave device **/
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/* Slave intrrupt handler */
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FI2cEvtHandler slave_evt_handlers[FI2C_SLAVE_INTR_EVT_NUM];
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} FI2c; /* Device instance */
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```
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- I2C驱动实例
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### 5.2 错误码定义
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- 模块错误码编号 `0x10b0000`
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- [0x0] FI2C_SUCCESS : fi2c success
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- [0x10b0001] FI2C_ERR_INVAL_PARM : fi2c invalid input parameters
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- [0x10b0002] FI2C_ERR_NOT_READY : fi2c driver not ready
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- [0x10b0001] FI2C_ERR_INVAL_PARM : fi2c invalid input parameters
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- [0x10b0003] FI2C_ERR_TIMEOUT : fi2c wait timeout
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- [0x10b0004] FI2C_ERR_NOT_SUPPORT : fi2c non support operation
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- [0x10b0005] FI2C_ERR_INVAL_STATE : fi2c invalid state
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### 5.3 用户API接口
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```c
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const FI2cConfig *FI2cLookupConfig(u32 instance_id);
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```
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- 获取I2C驱动的默认配置参数
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Note:
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- 用户需要修改配置参数时，可以通过修改返回的FI2cConfig副本，作为FI2cCfgInitialize函数的入参，
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Input:
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- u32 instance_id, 当前控制的I2C控制器实例号
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Return:
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- const FI2cConfig *, 返回驱动默认参数， NULL表示失败
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```c
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FError FI2cCfgInitialize(FI2c *instance_p, const FI2cConfig *cofig_p);
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```
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- 完成I2C驱动实例的初始化，使之可以使用
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Note:
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- 此函数会将驱动实例中的所有数据全部重置，同时会进行I2C控制器的重置，请不要在I2C数据传输过程中调用此函数
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Input:
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- FI2c *instance_p, I2C驱动实例数据
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- const FI2cConfig *cofig_p， I2C驱动配置数据
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Return:
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FError，参考6.2章错误码定义
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```c
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void FI2cDeInitialize(FI2c *instance_p);
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```
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- 完成I2C驱动实例去使能，清零实例数据
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Note:
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- 此函数会将驱动实例中的所有数据全部重置，
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Input:
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- FI2c *instance_p, I2C驱动实例数据
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Return:
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无
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```c
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const char *FI2cErrorToMessage(FError error);
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```
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- 获取I2C模块错误码对应的错误信息
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Note:
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- 请输入属于FI2C模块的错误码，否则返回的错误信息为空
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Input:
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- {FError} error, I2C输入错误码
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Return:
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- {const char *}, 错误码信息，NULL表示失败
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```c
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FError FI2cMasterReadPoll(FI2c *instance_p, u32 mem_addr, u8 mem_byte_len, u8 *buf_p, u32 buf_len);
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```
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- I2C主机读，阻塞直到完成读操作或失败
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Note:
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- 请先初始化I2C驱动再调用此函数
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- 请在Master工作模式下调用此函数
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Input:
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- @param {FI2c} *instance_p I2C驱动实例数据
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- @param {u32} inchip_addr 从机的内部偏移地址
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- @param {u8} mem_byte_len, Size of internal memory address 1->8bit ~ 4->32bit
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- @param {u8} *buf_p 读目的缓冲区
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- @param {int} buf_len 读目的缓冲区长度
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Return:
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- @return {FError *} 返回错误码
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```c
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FError FI2cMasterReadIntr(FI2c *instance_p, u32 mem_addr, u8 mem_byte_len, u8 *buf_p, u32 buf_len);
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```
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- I2C主机读，接收中断读操作或者失败
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Note:
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- 请先初始化I2C驱动再调用此函数
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- 请在Master工作模式下调用此函数
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Input:
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- @param {FI2c} *instance_p I2C驱动实例数据
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- @param {u32} inchip_addr 从机的内部偏移地址
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- @param {u8} *buf_p 读目的缓冲区
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- @param {u8} mem_byte_len, Size of internal memory address 1->8bit ~ 4->32bit
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- @param {int} buf_len 读目的缓冲区长度
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Return:
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- @return {FError *} 返回错误码
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```c
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FError FI2cMasterWriteIntr(FI2c *instance_p, u32 mem_addr, u8 mem_byte_len, const u8 *buf_p, u32 buf_len);
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```
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- I2C主机读，中断发送直到完成写操作或失败
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Note:
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- 请先初始化I2C驱动再调用此函数
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- 请在Master工作模式下调用此函数
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Input:
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- @param {FI2c} *instance_p I2C驱动实例数据
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- @param {u32} inchip_addr 从机的内部偏移地址
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- @param {u8} mem_byte_len, Size of internal memory address 1->8bit ~ 4->32bit
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- @param {u8} *buf_p 写源缓冲区
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- @param {size_t} buf_len 写源缓冲区长度
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Return:
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- @return {FError *} 返回错误码
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```c
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FError FError FI2cMasterWritePoll(FI2c *instance_p, u32 mem_addr, u8 mem_byte_len, const u8 *buf_p, u32 buf_len);
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```
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- I2C主机写，阻塞直到完成写操作或失败
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Note:
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- 请先初始化I2C驱动再调用此函数
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- 请在Master工作模式下调用此函数
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Input:
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- @param {FI2c} *instance_p I2C驱动实例数据
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- @param {u32} inchip_addr 从机的内部偏移地址
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- @param {u8} mem_byte_len, Size of internal memory address 1->8bit ~ 4->32bit
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- @param {u8} *buf_p 写源缓冲区
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- @param {size_t} buf_len 写源缓冲区长度
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Return:
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- @return {FError *} 返回错误码
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```c
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u32 FI2cGetIntr(FI2c *instance_p);
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```
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- 获取I2C instance_p的中断值
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Note:
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- 请先初始化I2C驱动再调用此函数
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Input:
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- @param {FI2c} *instance_p I2C驱动实例数据
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Return:
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- @return {u32} 中断状态寄存器的值
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```c
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FError FI2cMasterSetupIntr(FI2c *instance_p,u32 mask);
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```
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- 设置I2C主机的中断
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Note:
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- 请先初始化I2C驱动再调用此函数
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- 请在Master工作模式下调用此函数
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Input:
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- {FI2c} *instance_p I2C驱动实例数据
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- {u32} mask 需要操作的中断寄存器位
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Return:
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- {FError *} 返回错误码
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|
```c
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void FI2cMasterRegisterIntrHandler(FI2c *instance_p, u32 evt, FI2cEvtHandler handler);
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```
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|
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- 注册I2C主机中断事件函数
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Note:
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|
|
|
无
|
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|
|
|
|
|
|
|
|
|
Input:
|
|
|
|
|
|
- @param {FI2c} *instance_p I2C驱动实例数据
|
|
|
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|
|
- @param {u32} evt 中断事件，参考 FI2C_MASTER_INTR_EVT_NUM
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- @param {FI2cEvtHandler} handler 中断事件回调函数
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Return:
|
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|
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无
|
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|
|
|
|
|
|
|
```c
|
|
|
|
|
|
FError FI2cSlaveSetupIntr(FI2c *instance_p);
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
- 设置I2C从机的中断
|
|
|
|
|
|
|
|
|
|
|
|
Note:
|
|
|
|
|
|
- 请先初始化I2C驱动再调用此函数
|
|
|
|
|
|
- 请在Slave工作模式下调用此函数
|
|
|
|
|
|
|
|
|
|
|
|
Input:
|
|
|
|
|
|
- @param {FI2c} *instance_p I2C驱动实例数据
|
|
|
|
|
|
- @param {u32} evt 中断事件，参考 FI2C_MASTER_INTR_EVT_NUM
|
|
|
|
|
|
- @param {FI2cEvtHandler} handler 中断事件回调函数
|
|
|
|
|
|
|
|
|
|
|
|
Return:
|
|
|
|
|
|
- {FError *} 返回错误码
|
|
|
|
|
|
|
|
|
|
|
|
```c
|
|
|
|
|
|
void FI2cSlaveRegisterIntrHandler(FI2c *instance_p, u32 evt, FI2cEvtHandler handler);
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
- 注册I2C从机中断事件函数
|
|
|
|
|
|
|
|
|
|
|
|
Note:
|
|
|
|
|
|
无
|
|
|
|
|
|
|
|
|
|
|
|
Input:
|
|
|
|
|
|
- @param {FI2c} *instance_p I2C驱动实例数据
|
|
|
|
|
|
- @param {u32} evt 中断事件，参考 FI2C_SLAVE_INTR_EVT_NUM
|
|
|
|
|
|
- @param {FI2cEvtHandler} handler 中断事件回调函数
|
|
|
|
|
|
|
|
|
|
|
|
Return:
|
|
|
|
|
|
|
|
|
|
|
|
无
|
