#include "24cxx.h"
#include "i2c.h"
//初始化IIC接口

#define AT24CXX_HANDLE	(&hi2c4)	//IIC接口
#define AT24C_DEV_ADDR  (0XA0) 		//设备地址
#define AT24CXX_PAGE_SIZE  64 		//设备地址

void at24cxx_init(void)
{
	at24cxx_check();
}


//从指定地址开始写入多个字节数据
void at24cxx_write(uint16_t WriteAddr,uint8_t *pBuffer,uint16_t NumToWrite)
{
//	if(EE_TYPE < AT24C16)
//		HAL_I2C_Mem_Write(AT24CXX_HANDLE,AT24C_DEV_ADDR,WriteAddr,I2C_MEMADD_SIZE_8BIT,pBuffer,NumToWrite,HAL_MAX_DELAY);
//	else
//		HAL_I2C_Mem_Write(AT24CXX_HANDLE,AT24C_DEV_ADDR,WriteAddr,I2C_MEMADD_SIZE_16BIT,pBuffer,NumToWrite,HAL_MAX_DELAY);
    int selectPage_idx  = WriteAddr % AT24CXX_PAGE_SIZE;
    int selectPage_rest = AT24CXX_PAGE_SIZE - selectPage_idx;
    
    if (NumToWrite <= selectPage_rest) 
	{
        HAL_I2C_Mem_Write(AT24CXX_HANDLE,AT24C_DEV_ADDR,WriteAddr,I2C_MEMADD_SIZE_16BIT,pBuffer,NumToWrite,HAL_MAX_DELAY);
		delay_ms(5);
        
    } 
	else 
	{
		/*! 1 write selectPage rest*/
		HAL_I2C_Mem_Write(AT24CXX_HANDLE,AT24C_DEV_ADDR,WriteAddr,I2C_MEMADD_SIZE_16BIT,pBuffer,selectPage_rest,HAL_MAX_DELAY);
		delay_ms(5);

		WriteAddr  += selectPage_rest;
		NumToWrite -= selectPage_rest;
		pBuffer  += selectPage_rest;

		/*! 2 write nextPage full */
		int fullPage = NumToWrite/AT24CXX_PAGE_SIZE;
		for (int iPage = 0; iPage < fullPage; ++iPage) 
		{
			HAL_I2C_Mem_Write(AT24CXX_HANDLE,AT24C_DEV_ADDR,WriteAddr,I2C_MEMADD_SIZE_16BIT,pBuffer,AT24CXX_PAGE_SIZE,HAL_MAX_DELAY);
			delay_ms(5);

			WriteAddr  += AT24CXX_PAGE_SIZE;
			NumToWrite -= AT24CXX_PAGE_SIZE;
			pBuffer  += AT24CXX_PAGE_SIZE;
		}
	}
	
	/*! 3 write rest */
	if (0 != NumToWrite) 
	{
		HAL_I2C_Mem_Write(AT24CXX_HANDLE, AT24C_DEV_ADDR,WriteAddr,I2C_MEMADD_SIZE_16BIT,pBuffer,NumToWrite,HAL_MAX_DELAY);
		delay_ms(5);
	}
}


//从指定地址开始读取多个个字节数据
void at24cxx_read(uint16_t ReadAddr,uint8_t *pBuffer,uint16_t NumToRead)
{
//	if(EE_TYPE < AT24C16)
//		HAL_I2C_Mem_Read(AT24CXX_HANDLE,AT24C_DEV_ADDR,ReadAddr,I2C_MEMADD_SIZE_8BIT,pBuffer,NumToRead,HAL_MAX_DELAY);
//	else
//		HAL_I2C_Mem_Read(AT24CXX_HANDLE,AT24C_DEV_ADDR,ReadAddr,I2C_MEMADD_SIZE_16BIT,pBuffer,NumToRead,HAL_MAX_DELAY);
	int selectPage_idx  = ReadAddr % AT24CXX_PAGE_SIZE;
    int selectPage_rest = AT24CXX_PAGE_SIZE - selectPage_idx;
    
    if (NumToRead <= selectPage_rest) 
	{
        HAL_I2C_Mem_Read(AT24CXX_HANDLE,AT24C_DEV_ADDR,ReadAddr,I2C_MEMADD_SIZE_16BIT,pBuffer,NumToRead,HAL_MAX_DELAY);
		delay_ms(5);
        
    } 
	else 
	{
		/*! 1 write selectPage rest*/
		HAL_I2C_Mem_Read(AT24CXX_HANDLE,AT24C_DEV_ADDR,ReadAddr,I2C_MEMADD_SIZE_16BIT,pBuffer,selectPage_rest,HAL_MAX_DELAY);
		delay_ms(5);

		ReadAddr  += selectPage_rest;
		NumToRead -= selectPage_rest;
		pBuffer  += selectPage_rest;

		/*! 2 write nextPage full */
		int fullPage = NumToRead/AT24CXX_PAGE_SIZE;
		for (int iPage = 0; iPage < fullPage; ++iPage) 
		{
			HAL_I2C_Mem_Read(AT24CXX_HANDLE,AT24C_DEV_ADDR,ReadAddr,I2C_MEMADD_SIZE_16BIT,pBuffer,AT24CXX_PAGE_SIZE,HAL_MAX_DELAY);
			delay_ms(5);

			ReadAddr  += AT24CXX_PAGE_SIZE;
			NumToRead -= AT24CXX_PAGE_SIZE;
			pBuffer  += AT24CXX_PAGE_SIZE;
		}
	}
	
	/*! 3 write rest */
	if (0 != NumToRead) 
	{
		HAL_I2C_Mem_Read(AT24CXX_HANDLE, AT24C_DEV_ADDR,ReadAddr,I2C_MEMADD_SIZE_16BIT,pBuffer,NumToRead,HAL_MAX_DELAY);
		delay_ms(5);
	}
} 


//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
uint8_t at24cxx_check(void)
{
	uint8_t temp;
	uint8_t data = 0XAB;
	at24cxx_read(EE_TYPE,&temp,1);//避免每次开机都写AT24CXX			   
	if(temp == 0XAB)
		return 1;		   
	else//排除第一次初始化的情况
	{
		at24cxx_write(EE_TYPE,&data,1);
	    at24cxx_read(EE_TYPE,&temp,1);;	  
		if(temp == 0XAB)
			return 1;
	}
	return 0;											  
}