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122 lines
3.5 KiB
122 lines
3.5 KiB
2 years ago
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## I2C
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战舰 F103ZET6
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24C02 的 SCL 和 SDA 分别连在 STM32F1 的 PB6 和 PB7 上， 对应IIC1
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考虑更16bit的 EEPROM， 时钟模块等
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可以考虑 LL库配置， Project 管理里面可以选择 HAL LL库
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### 配置
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I2C1 PB6 和 PB7 不需要重映射
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400000 快速
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开启中断
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配置生成代码后 ，
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### 库函数
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库函数 参考 stm32f1xx_hal_i2c.h
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包含 polling IT DMA 三种模式，以及事件处理
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LL_I2C_Enable(I2C2);
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LL_I2C_EnableIT_EVT(I2C2);
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status = HAL_I2C_Master_Transmit(&hi2c1,32,i2c_master_buff,6,1000);
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status = HAL_I2C_Master_Receive(&hi2c1,32,rx_buff,10,1000);
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返回状态码为1
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### 结构体如何写入 EEPROM
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### 代码
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对AT24CXX 不同型号的封装
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```C
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#ifndef __HAL_AT24CXX_H__
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#define __HAL_AT24CXX_H__
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#include "stm32f1xx_hal.h"
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#define AT24C01 127
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#define AT24C02 255
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#define AT24C04 511
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#define AT24C08 1023
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#define AT24C16 2047
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#define AT24C32 4095
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#define AT24C64 8191
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#define AT24C128 16383
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#define AT24C256 32767
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//我使用的是AT24C02
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#define EE_TYPE AT24C02
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void AT24CXX_Init(void);
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void AT24CXX_Write(uint16_t WriteAddr,uint8_t *pBuffer,uint16_t NumToWrite);
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void AT24CXX_Read(uint16_t ReadAddr,uint8_t *pBuffer,uint16_t NumToRead);
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uint8_t AT24CXX_Check(void);
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#endif
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```
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```C
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#include "HAL_AT24CXX.h"
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extern I2C_HandleTypeDef hi2c1;
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#define AT24CXX_HANDLE (&hi2c1) //IIC接口
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#define AT24C_DEV_ADDR (0XA0) //设备地址
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void AT24CXX_Init(void)
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{
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//IIC_Init();//IIC初始化
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AT24CXX_Check();
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}
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/*****************************************
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函数名：void AT24CXX_Write(uint16_t WriteAddr,uint8_t *pBuffer,uint16_t NumToWrite)
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参数：WriteAddr :要写入数据的地址 pBuffer：要写入的数据的首地址 NumToWrite：要写入数据的长度
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功能描述：从指定地址开始写入多个字节数据
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返回值：无
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*****************************************/
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void AT24CXX_Write(uint16_t WriteAddr,uint8_t *pBuffer,uint16_t NumToWrite)
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{
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if(EE_TYPE < AT24C16)
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HAL_I2C_Mem_Write(AT24CXX_HANDLE,AT24C_DEV_ADDR,WriteAddr,I2C_MEMADD_SIZE_8BIT,pBuffer,NumToWrite,HAL_MAX_DELAY);
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else
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HAL_I2C_Mem_Write(AT24CXX_HANDLE,AT24C_DEV_ADDR,WriteAddr,I2C_MEMADD_SIZE_16BIT,pBuffer,NumToWrite,HAL_MAX_DELAY);
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}
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/*****************************************
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函数名：AT24CXX_Read(uint16_t ReadAddr,uint8_t *pBuffer,uint16_t NumToRead)
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参数： ReadAddr：要读取数据的地址 pBuffer：回填数据首地址 NumToRead:数据长度
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功能描述：从指定地址开始读取多个个字节数据
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返回值：无
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*****************************************/
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void AT24CXX_Read(uint16_t ReadAddr,uint8_t *pBuffer,uint16_t NumToRead)
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{
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if(EE_TYPE < AT24C16)
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HAL_I2C_Mem_Read(AT24CXX_HANDLE,AT24C_DEV_ADDR,ReadAddr,I2C_MEMADD_SIZE_8BIT,pBuffer,NumToRead,HAL_MAX_DELAY);
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else
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HAL_I2C_Mem_Write(AT24CXX_HANDLE,AT24C_DEV_ADDR,ReadAddr,I2C_MEMADD_SIZE_16BIT,pBuffer,NumToRead,HAL_MAX_DELAY);
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}
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/*****************************************
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函数名：uint8_t AT24CXX_Check(void)
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参数：无
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功能描述：检查AT24CXX是否正常，这里用了24XX的最后一个地址(255)来存储标志字.如果用其他24C系列,这个地址要修改
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返回值：检测成功返回0 失败返回1
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*****************************************/
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uint8_t AT24CXX_Check(void)
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{
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uint8_t temp;
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uint8_t data = 0XAB;
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AT24CXX_Read(EE_TYPE,&temp,1);//避免每次开机都写AT24CXX
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if(temp != 0XAB)
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return 1;
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else//排除第一次初始化的情况
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{
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AT24CXX_Write(EE_TYPE,&data,1);
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AT24CXX_Read(EE_TYPE,&temp,1);;
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if(temp != 0XAB)
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return 1;
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}
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return 0;
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}
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```
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