STM32F405是意法半导体(STMicroelectronics)生产的基于ARM Cortex-M4内核的微控制器,广泛应用于嵌入式系统设计。在IIC(Inter-Integrated Circuit,也称为I²C)通信协议中,STM32F405作为主设备,能够与各种外围设备如传感器、时钟芯片、EEPROM等进行数据交换。IIC协议是一种多主控、双向二线制总线,由Philips(现NXP Semiconductors)公司开发,适用于短距离、低速的通信场景。 IIC协议的关键知识点包括: 1. **总线结构**:IIC总线由两条线构成,一条是数据线SDA(Serial Data Line),另一条是时钟线SCL(Serial Clock Line)。它们都是开漏输出,通过上拉电阻实现高电平。 2. **帧格式**:每个IIC传输由起始信号、地址帧、数据帧和停止信号组成。起始和停止信号由主设备发出,地址帧包括7位或10位的从设备地址和一个读/写位,数据帧可以包含多个8位数据。 3. **时钟同步**:主设备控制SCL时钟线,确保所有设备都能正确地同步数据传输。 4. **数据传输**:在每个时钟周期,SDA线上数据的改变必须发生在时钟的下降沿,数据在时钟的上升沿被采样。 5. **仲裁机制**:在多主控环境中,如果两个主设备同时尝试启动传输,拥有最低地址的设备获胜。 6. **ACK/NACK信号**:接收方在接收到数据后,会在下一个时钟周期发送一个ACK(低电平)或NACK(高电平)信号,表示数据是否被正确接收。 在STM32F405实现IIC读写的程序中,通常会涉及以下部分: - **初始化配置**:设置GPIO引脚为推挽输出,并设置合适的上拉电阻。配置定时器生成IIC所需的时钟。 - **起始条件**:通过设置SDA和SCL线的电平变化模拟起始条件。 - **发送地址和命令**:按照IIC帧格式发送7位或10位的从机地址和读写标志位。 - **数据交换**:根据读写标志,读取或写入数据。写入时,主设备发送数据并等待从设备的ACK;读取时,主设备先发送一个ACK,然后从设备发送数据,主设备再根据需要决定是否发送ACK(读最后一个数据时发送NACK)。 - **停止条件**:发送停止条件以结束通信。 在提供的压缩包`F4_IIC`中,可能包含了以下文件: - `stm32f4xx_hal_i2c.c/h`:STM32 HAL库中的IIC驱动源代码和头文件,提供了与硬件交互的底层接口。 - `main.c`:项目的主要入口文件,通常包含IIC的初始化和实际读写操作。 - `i2c_helpers.c/h`:辅助函数,用于构建IIC通信帧,处理ACK/NACK等。 - `config.h`:项目配置文件,可能包含IIC相关的定义,如从设备地址、波特率等。 - `device_driver.c/h`:针对具体IIC设备的驱动程序,如读取或写入特定寄存器。 要使用这个程序,你需要根据你的硬件配置和目标设备调整`config.h`中的参数,然后在`main.c`中调用相应的函数来初始化IIC并进行数据交换。注意检查IIC的时序图,确保软件实现与协议规范一致,以便正确地与从设备通信。
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- 路途@遥远2021-09-02不是硬件IIC 模拟的IIC
- 云海无语2021-08-31可以参考使用
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