上文：STM32：硬件IIC，实现EEPROM页写入和连续内存数据读取，但是出现数据出错（上）

https://blog.csdn.net/qq_45689790/article/details/113729858#comments_15148487

按照手册内容实现连续数据的写入（但是不能跨页）和单个数据的写入后。下面介绍硬件IIC跨页写入任意长度的数据。

基本思想：若一页有8个数据

1. 确定要写入的地址WriteAddr ，OnePage = 8 - WriteAddr%8 得到的就是第一页需要写入的数据个数
2. NumByteToWrite是一共要写入的数据个数，End_page =（NumByteToWrite-OnePage）% 8 得到的是最后一页需要写入的数据个数。
3. 确定OnePage 、End_page 后，（NumByteToWrite - OnePage - End_page ）/ 8得到的就是中间需要连续写入的数据页数。

举个例子

1. WriteAddr = 17，OnePage = 8 - WriteAddr%8 = 7
2. NumByteToWrite = 2，那么 End_page =（NumByteToWrite-OnePage）% 8 = 7
3. 确定OnePage 、End_page后（NumByteToWrite - OnePage - End_page ）% 8 = 1中间需要连续写入1页数据

图示

连续写入数据，大致分为三步，下面是参考代码

void I2C_EE_WaitEepromStandbyState(void); //是等待响应的函数，不再展开 

 
  #define I2C_PageSize 8
  
 void I2C_EE_BufferWrite(u8* pBuffer, u8 WriteAddr,
						u16 NumByteToWrite)
 { 
	u8 NumOfPage=0,NumOfSingle=0,Addr =0,count=0,temp =0;
 
	
	Addr = WriteAddr % I2C_PageSize;
 
	
	count = I2C_PageSize - Addr;
	
	
	NumOfPage = NumByteToWrite / I2C_PageSize;
 
	
	NumOfSingle = NumByteToWrite % I2C_PageSize;
	
	// Addr=0,则 WriteAddr 刚好按页对齐 aligned
	// 这样就很简单了，直接写就可以，写完整页后
	// 把剩下的不满一页的写完即可
	if (Addr == 0) { 
		
		if (NumOfPage == 0) { 
			I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);
			I2C_EE_WaitEepromStandbyState();
		}
		
		else { 
			
			while (NumOfPage--) { 
				I2C_EE_PageWrite(pBuffer, WriteAddr, I2C_PageSize);
				I2C_EE_WaitEepromStandbyState();
				WriteAddr += I2C_PageSize;
				pBuffer += I2C_PageSize;
			}
			
			if (NumOfSingle!=0) { 
			I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);
			I2C_EE_WaitEepromStandbyState();
			}
		}
	}
	// 如果 WriteAddr 不是按 I2C_PageSize 对齐
	// 那就算出对齐到页地址还需要多少个数据，然后
	// 先把这几个数据写完，剩下开始的地址就已经对齐
	// 到页地址了，代码重复上面的即可
	else { 
		
		if (NumOfPage== 0) { 
			
				if (NumOfSingle > count) { 
					// temp 的数据要写到写一页
					temp = NumOfSingle - count;
					I2C_EE_PageWrite(pBuffer, WriteAddr, count);
					I2C_EE_WaitEepromStandbyState();
					WriteAddr += count;
					pBuffer += count;
					
					I2C_EE_PageWrite(pBuffer, WriteAddr, temp);
					I2C_EE_WaitEepromStandbyState();
				} 
				else {  
						I2C_EE_PageWrite(pBuffer, WriteAddr, NumByteToWrite);
						I2C_EE_WaitEepromStandbyState();
					}
		}
		
		else { 
			
			NumByteToWrite -= count;
			NumOfPage = NumByteToWrite / I2C_PageSize;
			NumOfSingle = NumByteToWrite % I2C_PageSize;
			
			
			if (count != 0) { 
				I2C_EE_PageWrite(pBuffer, WriteAddr, count);
				I2C_EE_WaitEepromStandbyState();
				
				WriteAddr += count;
				pBuffer += count;
			}
			
			while (NumOfPage--) { 
				I2C_EE_PageWrite(pBuffer, WriteAddr, I2C_PageSize);
				I2C_EE_WaitEepromStandbyState();
				WriteAddr += I2C_PageSize;
				pBuffer += I2C_PageSize;
			}
			
			if (NumOfSingle != 0) { 
				I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);
				I2C_EE_WaitEepromStandbyState();
			}
		}
	}
}

	参考书籍：《野火STM32库函数开发指南》