stm32I2C连续读写问题

z5071507@126.co 提问时间：2011-12-15 19:26 /

下面是写数据与读数据部分
void I2C_Send_n_Data(u16 addr,u8 *data,u8 len)//数据地址，数据指针，要写数据长度
{
I2C_Cmd(I2C1,DISABLE);
I2C_Cmd(I2C1,ENABLE);
ScrollPage:
I2C_AcknowledgeConfig(I2C1, ENABLE);
while(((u16)(I2C1->SR2)&(u16)(0x0002))==0x0002);
I2C_GenerateSTART(I2C1,ENABLE);
while(!(((u16)(I2C1->SR1)&(u16)(0x0001))));
while(!((u16)(I2C1->SR2)&(u16)(0x0011))==0x0011);
I2C_Send7bitAddress(I2C1,0xA0, I2C_Direction_Transmitter);
delay();
while(!((u16)(I2C1->SR1)&(u16)(0x0082))==0x0082);
while(!((u16)(I2C1->SR2)&(u16)(0x0007))==0x0007);
I2C_SendData(I2C1, (addr>>8)&0xff);
delay();
while(!((u16)(I2C1->SR1)&(u16)(0x0080))==0x0080);
while(!((u16)(I2C1->SR2)&(u16)(0x0007))==0x0007);
I2C_SendData(I2C1, addr&0xff);
delay();
while(!((u16)(I2C1->SR1)&(u16)(0x0080))==0x0080);
while(!((u16)(I2C1->SR2)&(u16)(0x0007))==0x0007);
I2C_SendData(I2C1, *data++);
delay();
while(!((u16)(I2C1->SR1)&(u16)(0x0080))==0x0080);
while(!((u16)(I2C1->SR2)&(u16)(0x0007))==0x0007);
addr++;
len--;
while(len)
   {
        if((addr%128)!=0)//由于一页写完需要产生一个停止信号，所以此处需要判断一页是否写完
{
            I2C_SendData(I2C1,*(data++));
            delay();
     while(!((u16)(I2C1->SR1)&(u16)(0x0080))==0x0080);
            while(!((u16)(I2C1->SR2)&(u16)(0x0007))==0x0007);

            addr++;
            len--;
        }
        else
{
            I2C_GenerateSTOP(I2C1,ENABLE);
            goto ScrollPage;
        }
    }
I2C_GenerateSTOP(I2C1,ENABLE);
delay();
while(((u16)(I2C1->SR2)&(u16)(0x0002))==0x0002);
}
void I2C_Read_n_Data(u16 addr,u8 *data,u8 len)
{
u8 i;
I2C_Cmd(I2C1,DISABLE);
I2C_Cmd(I2C1,ENABLE);
I2C_AcknowledgeConfig(I2C1, ENABLE);
I2C_GenerateSTART(I2C1,ENABLE);
delay();
while(!((u16)(I2C1->SR1)&(u16)(0x0001))==0x0001);
while(!((u16)(I2C1->SR2)&(u16)(0x0011))==0x0011);
I2C_Send7bitAddress(I2C1,0xA0, I2C_Direction_Transmitter);
delay();
while(!((u16)(I2C1->SR1)&(u16)(0x0082))==0x0082);
while(!((u16)(I2C1->SR2)&(u16)(0x0007))==0x0007);
I2C_SendData(I2C1, (addr>>8)&0xff);
delay();
while(!((u16)(I2C1->SR1)&(u16)(0x0080))==0x0080);
while(!((u16)(I2C1->SR2)&(u16)(0x0007))==0x0007);
I2C_SendData(I2C1, addr&0xff);
delay();
while(!((u16)(I2C1->SR1)&(u16)(0x0080))==0x0080);
while(!((u16)(I2C1->SR2)&(u16)(0x0007))==0x0007);
I2C_GenerateSTART(I2C1,ENABLE);
delay();
while(!((u16)(I2C1->SR1)&(u16)(0x0001)));
while(!((u16)(I2C1->SR2)&(u16)(0x0011))==0x0011);
I2C_AcknowledgeConfig(I2C1, DISABLE);
I2C_Send7bitAddress(I2C1,0xA0, I2C_Direction_Receiver);
delay();
while(!((u16)(I2C1->SR1)&(u16)(0x0082))==0x0082);
while(!((u16)(I2C1->SR2)&(u16)(0x0007))==0x0007);
if(len>1)
    {
        for(i=0;iSR1)&(u16)(0x0040))==0x0040);
     while(!((u16)(I2C1->SR2)&(u16)(0x0003))==0x0003);//主模式，总线忙，字节发送结束
            delay();
     while(!((u16)(I2C1->SR1)&(u16)(0x0004))==0x0004);
            *data=I2C_ReceiveData(I2C1);//读出DR寄存器中的值
            I2C_AcknowledgeConfig(I2C1,ENABLE);//应答使能
            data++;
        }
    }
while(!((u16)(I2C1->SR1)&(u16)(0x0040))==0x0040);
while(!((u16)(I2C1->SR2)&(u16)(0x0003))==0x0003);//主模式，总线忙，字节发送结束
delay();
while(!((u16)(I2C1->SR1)&(u16)(0x0004))==0x0004);
*data=I2C_ReceiveData(I2C1);//读出DR寄存器中的值
I2C_AcknowledgeConfig(I2C1,DISABLE);//应答失能，无应答
I2C_GenerateSTOP(I2C1,ENABLE);
delay();
while(((u16)(I2C1->SR2)&(u16)(0x0002))==0x0002);//等待总线通信结束}
其中我在串口中断中用到了这两个读写函数，假如我设置一次性让串口输出50个数据，这程序总是只有第一个数是正确的，另外49个数都是ff，本人菜鸟，请高手解答，一下是中断中应用部分，其中p和q是我所设置的两个指针，指向要存储的数据的，其中q是和c[j
]对应的
if(i>49)
{
i=0;
I2C_Send_n_Data(0x00000000,p,50);
delay();
I2C_Read_n_Data(0x00000000,q,50);

for(j=0;jSR&0X0040));//等待发送完成
}
}
USART_ClearITPendingBit(USART2,USART_IT_RXNE); //清除中断标志位