130 lines
3.7 KiB
C
130 lines
3.7 KiB
C
#include "24cxx.h"
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#include "i2c.h"
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//初始化IIC接口
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#define AT24CXX_HANDLE (&hi2c4) //IIC接口
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#define AT24C_DEV_ADDR (0XA0) //设备地址
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#define AT24CXX_PAGE_SIZE 64 //设备地址
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void at24cxx_init(void)
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{
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at24cxx_check();
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}
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//从指定地址开始写入多个字节数据
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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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int selectPage_idx = WriteAddr % AT24CXX_PAGE_SIZE;
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int selectPage_rest = AT24CXX_PAGE_SIZE - selectPage_idx;
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if (NumToWrite <= selectPage_rest)
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{
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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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delay_ms(5);
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}
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else
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{
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/*! 1 write selectPage rest*/
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HAL_I2C_Mem_Write(AT24CXX_HANDLE,AT24C_DEV_ADDR,WriteAddr,I2C_MEMADD_SIZE_16BIT,pBuffer,selectPage_rest,HAL_MAX_DELAY);
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delay_ms(5);
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WriteAddr += selectPage_rest;
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NumToWrite -= selectPage_rest;
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pBuffer += selectPage_rest;
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/*! 2 write nextPage full */
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int fullPage = NumToWrite/AT24CXX_PAGE_SIZE;
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for (int iPage = 0; iPage < fullPage; ++iPage)
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{
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HAL_I2C_Mem_Write(AT24CXX_HANDLE,AT24C_DEV_ADDR,WriteAddr,I2C_MEMADD_SIZE_16BIT,pBuffer,AT24CXX_PAGE_SIZE,HAL_MAX_DELAY);
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delay_ms(5);
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WriteAddr += AT24CXX_PAGE_SIZE;
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NumToWrite -= AT24CXX_PAGE_SIZE;
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pBuffer += AT24CXX_PAGE_SIZE;
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}
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}
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/*! 3 write rest */
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if (0 != NumToWrite)
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{
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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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delay_ms(5);
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}
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}
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//从指定地址开始读取多个个字节数据
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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_Read(AT24CXX_HANDLE,AT24C_DEV_ADDR,ReadAddr,I2C_MEMADD_SIZE_16BIT,pBuffer,NumToRead,HAL_MAX_DELAY);
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int selectPage_idx = ReadAddr % AT24CXX_PAGE_SIZE;
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int selectPage_rest = AT24CXX_PAGE_SIZE - selectPage_idx;
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if (NumToRead <= selectPage_rest)
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{
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HAL_I2C_Mem_Read(AT24CXX_HANDLE,AT24C_DEV_ADDR,ReadAddr,I2C_MEMADD_SIZE_16BIT,pBuffer,NumToRead,HAL_MAX_DELAY);
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delay_ms(5);
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}
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else
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{
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/*! 1 write selectPage rest*/
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HAL_I2C_Mem_Read(AT24CXX_HANDLE,AT24C_DEV_ADDR,ReadAddr,I2C_MEMADD_SIZE_16BIT,pBuffer,selectPage_rest,HAL_MAX_DELAY);
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delay_ms(5);
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ReadAddr += selectPage_rest;
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NumToRead -= selectPage_rest;
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pBuffer += selectPage_rest;
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/*! 2 write nextPage full */
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int fullPage = NumToRead/AT24CXX_PAGE_SIZE;
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for (int iPage = 0; iPage < fullPage; ++iPage)
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{
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HAL_I2C_Mem_Read(AT24CXX_HANDLE,AT24C_DEV_ADDR,ReadAddr,I2C_MEMADD_SIZE_16BIT,pBuffer,AT24CXX_PAGE_SIZE,HAL_MAX_DELAY);
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delay_ms(5);
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ReadAddr += AT24CXX_PAGE_SIZE;
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NumToRead -= AT24CXX_PAGE_SIZE;
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pBuffer += AT24CXX_PAGE_SIZE;
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}
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}
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/*! 3 write rest */
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if (0 != NumToRead)
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{
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HAL_I2C_Mem_Read(AT24CXX_HANDLE, AT24C_DEV_ADDR,ReadAddr,I2C_MEMADD_SIZE_16BIT,pBuffer,NumToRead,HAL_MAX_DELAY);
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delay_ms(5);
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}
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}
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//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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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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