介紹使用硬件IIC接口讀寫AT24C02，STM32自帶硬件IIC，比較好用，沒必要千篇一律的使用模擬IIC。作為一個IIC的使用例子，可以適當修改用于其他IIC接口設備通信控制。

一、測試環境

STM32F407+CubeMx（6.1.1）+MDK（5.34)+AT24C02

IIC Pin：PB8 PB9

CubeMx配置如下：

二、I2C驅動代碼

CubeMx生成i2c.c i2c.h。讀寫使用HAL庫的IIC操作接口：

/*** @brief Write an amount of data in blocking mode to a specific memory address* @param hi2c Pointer to a I2C_HandleTypeDef structure that contains* the configuration information for the specified I2C.* @param DevAddress Target device address: The device 7 bits address value* in datasheet must be shifted to the left before calling the interface* @param MemAddress Internal memory address* @param MemAddSize Size of internal memory address* @param pData Pointer to data buffer* @param Size Amount of data to be sent* @param Timeout Timeout duration* @retval HAL status*/ HAL_StatusTypeDef HAL_I2C_Mem_Write(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint16_t MemAddress, uint16_t MemAddSize, uint8_t *pData, uint16_t Size, uint32_t Timeout);/*** @brief Read an amount of data in blocking mode from a specific memory address* @param hi2c Pointer to a I2C_HandleTypeDef structure that contains* the configuration information for the specified I2C.* @param DevAddress Target device address: The device 7 bits address value* in datasheet must be shifted to the left before calling the interface* @param MemAddress Internal memory address* @param MemAddSize Size of internal memory address* @param pData Pointer to data buffer* @param Size Amount of data to be sent* @param Timeout Timeout duration* @retval HAL status*/ HAL_StatusTypeDef HAL_I2C_Mem_Read(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint16_t MemAddress, uint16_t MemAddSize, uint8_t *pData, uint16_t Size, uint32_t Timeout);

三、AT24C02驅動代碼

頭文件：at24c02.h

代碼里邊寫了一個測試用例的宏開關，測試階段打開AT24CXX_TEST_ENABLE，配置需要測試的起始地址AT24CXX_TEST_ADDR和測試讀寫長度AT24CXX_TEST_SIZE，調用AT24C02_Test()進行測試，返回值表示讀寫出錯的數據個數。

例如：

OS_msgPrintf("AT24C02_Test err = %d\r\n",AT24C02_Test());??

打印：AT24C02_Test err = 0

表示指定測試地址和長度讀寫成功。

/******************************************************************************** File Name : at24c02.h* Description : this code is used for at24c02 application* Author : JackWang* Date : 2019-05-07****************************************************************************** */#ifndef __AT24C02_H #define __AT24C02_H#ifdef __cplusplusextern "C" { #endif/*! -------------------------------------------------------------------------- */ /*! Include headers */ #include <stdint.h>#define AT24CXX_TEST_ENABLE 0/*! -------------------------------------------------------------------------- */ /*! Public functions prototype */ int AT24C02_write(uint8_t addr, uint8_t* dataPtr, uint16_t dataSize); int AT24C02_read (uint8_t addr, uint8_t* dataPtr, uint16_t dataSize);#if (1 == AT24CXX_TEST_ENABLE) /*! -------------------------------------------------------------------------- */ /*! Public test functions prototype */ #define AT24CXX_TEST_ADDR 39 #define AT24CXX_TEST_BUFF_SIZE 255 #define AT24CXX_TEST_SIZE 90int AT24C02_Test(void); #endif#ifdef __cplusplus } #endif#endif /*! end of the file */

實現文件：at24c02.c

讀寫采用了扇區Page讀寫方式，可以給定任意有效地址和有效長度進行操作，方便應用層調用。

移植代碼時注意頭文件sysdelay.h換成自己的延時函數文件。主要是實現delayms。

/******************************************************************************** File Name : at24c02.c* Description : this code is used for at24c02 application* Author : JackWang* Date : 2019-05-07****************************************************************************** *//*! -------------------------------------------------------------------------- */ /*! Include headers */ #include "at24c02.h" #include "sysdelay.h" #include "i2c.h"/*! -------------------------------------------------------------------------- */ /*! Private macros define */ #define AT24CXX_Write_ADDR 0xA0 #define AT24CXX_Read_ADDR 0xA1 #define AT24CXX_MAX_SIZE 256 #define AT24CXX_PAGE_SIZE 8 #define AT24CXX_PAGE_TOTAL (AT24CXX_MAX_SIZE/AT24CXX_PAGE_SIZE)/*! -------------------------------------------------------------------------- */ /*! Public functions list */ int AT24C02_write(uint8_t addr, uint8_t* dataPtr, uint16_t dataSize); int AT24C02_read (uint8_t addr, uint8_t* dataPtr, uint16_t dataSize);/*! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ int AT24C02_write(uint8_t addr, uint8_t* dataPtr, uint16_t dataSize) {if (0 == dataSize) { return -1; }int res = HAL_OK;int selectPage_idx = addr % AT24CXX_PAGE_SIZE;int selectPage_rest = AT24CXX_PAGE_SIZE - selectPage_idx;if (dataSize <= selectPage_rest) {res = HAL_I2C_Mem_Write(&hi2c1, AT24CXX_Write_ADDR, addr,I2C_MEMADD_SIZE_8BIT, dataPtr,dataSize,0xFF);if (HAL_OK != res) { return -1; }sysDelay_ms(10);} else {/*! 1 write selectPage rest*/res = HAL_I2C_Mem_Write(&hi2c1, AT24CXX_Write_ADDR, addr,I2C_MEMADD_SIZE_8BIT, dataPtr,selectPage_rest,0xFF);if (HAL_OK != res) { return -1; }addr += selectPage_rest;dataSize -= selectPage_rest;dataPtr += selectPage_rest;sysDelay_ms(5);/*! 2 write nextPage full */int fullPage = dataSize/AT24CXX_PAGE_SIZE;for (int iPage = 0; iPage < fullPage; ++iPage) {res = HAL_I2C_Mem_Write(&hi2c1, AT24CXX_Write_ADDR, addr,I2C_MEMADD_SIZE_8BIT, dataPtr,AT24CXX_PAGE_SIZE,0xFF);if (HAL_OK != res) { return -1; }sysDelay_ms(5);addr += AT24CXX_PAGE_SIZE;dataSize -= AT24CXX_PAGE_SIZE;dataPtr += AT24CXX_PAGE_SIZE;}/*! 3 write rest */if (0 != dataSize) {res = HAL_I2C_Mem_Write(&hi2c1, AT24CXX_Write_ADDR, addr,I2C_MEMADD_SIZE_8BIT, dataPtr,dataSize,0xFF);if (HAL_OK != res) { return -1; }sysDelay_ms(5);}}return 0; }/*! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ int AT24C02_read(uint8_t addr, uint8_t* dataPtr, uint16_t dataSize) {int res = HAL_I2C_Mem_Read(&hi2c1,AT24CXX_Read_ADDR,addr,I2C_MEMADD_SIZE_8BIT,dataPtr,dataSize,0xFF);if (HAL_OK != res) { return -1; }return 0; }#if (1 == AT24CXX_TEST_ENABLE) /*! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ #include <string.h> static uint8_t AT24CXX_testBuff[AT24CXX_TEST_BUFF_SIZE];int AT24C02_Test(void) { for (int idx = 0; idx < AT24CXX_TEST_BUFF_SIZE; ++idx) {AT24CXX_testBuff[idx] = idx;}AT24C02_write(AT24CXX_TEST_ADDR, AT24CXX_testBuff+AT24CXX_TEST_ADDR, AT24CXX_TEST_SIZE);memset(AT24CXX_testBuff, 0, AT24CXX_TEST_BUFF_SIZE);AT24C02_read(AT24CXX_TEST_ADDR, AT24CXX_testBuff, AT24CXX_TEST_SIZE); int err = 0;for (int idx = 0; idx < AT24CXX_TEST_SIZE; ++idx) {if ((AT24CXX_TEST_ADDR+idx) != AT24CXX_testBuff[idx]) err++;}return err;} #endif

總體上代碼還算簡潔，供大家參考使用。

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