全球云邮登陆网站,公司网站建设注意什么,郑州企业网站排名优化方法,深圳网络推广哪家公司好介绍使用硬件IIC接口读写AT24C02#xff0c;STM32自带硬件IIC#xff0c;比较好用#xff0c;没必要千篇一律的使用模拟IIC。作为一个IIC的使用例子#xff0c;可以适当修改用于其他IIC接口设备通信控制。
一、测试环境
STM32F407CubeMx#xff08;6.1.1#xff09;MDK…介绍使用硬件IIC接口读写AT24C02STM32自带硬件IIC比较好用没必要千篇一律的使用模拟IIC。作为一个IIC的使用例子可以适当修改用于其他IIC接口设备通信控制。
一、测试环境
STM32F407CubeMx6.1.1MDK5.34)AT24C02
IIC PinPB8 PB9
CubeMx配置如下 二、I2C驱动代码
CubeMx生成i2c.c i2c.h。读写使用HAL库的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驱动代码
头文件at24c02.h
代码里边写了一个测试用例的宏开关测试阶段打开AT24CXX_TEST_ENABLE配置需要测试的起始地址AT24CXX_TEST_ADDR和测试读写长度AT24CXX_TEST_SIZE调用AT24C02_Test()进行测试返回值表示读写出错的数据个数。
例如
OS_msgPrintf(AT24C02_Test err %d\r\n,AT24C02_Test());
打印AT24C02_Test err 0
表示指定测试地址和长度读写成功。
/******************************************************************************** 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 */实现文件at24c02.c
读写采用了扇区Page读写方式可以给定任意有效地址和有效长度进行操作方便应用层调用。
移植代码时注意头文件sysdelay.h换成自己的延时函数文件。主要是实现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_testBuffAT24CXX_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_ADDRidx) ! AT24CXX_testBuff[idx]) err;}return err;}
#endif
总体上代码还算简洁供大家参考使用。
