我来看看，//从AT24C02读出一个字节，ByteAddr字节地址(0~255)
int AT24C02_ReadByte(u8 ByteAddr)
{
int clear;
clear=clear;
while(I2C1->SR2&=1<<1); //等待SR2.Busy=0(总线空闲)
I2C1->CR1 |= 1<<8; //I2C1产生起始条件
while(!(I2C1->SR1&=1<<0));//等待SR1.SB=1开始位已经发送
I2C1->SR1 &= ~(1<<10);//SR1.AF清零
I2C1->DR = AT24C02_Addr_Write;//写入AT24C02的地址Addr，写指令，SR1.SB清零
while(!(I2C1->SR1&=1<<1));//等待SR1.ADDR=1，从设备应答
clear=I2C1->SR1;
clear=I2C1->SR2;//SR1.ADDR清零
I2C1->DR = ByteAddr;//写入字节地址
I2C1->CR1 |= 1<<8; //I2C1产生起始条件
while(!(I2C1->SR1&=1<<0));//等待SR1.SB=1开始位已经发送
I2C1->SR1 &= ~(1<<10);//SR1.AF清零
I2C1->DR = AT24C02_Addr_Read;//写入AT24C02的地址Addr，读指令，SR1.SB清零
while(!(I2C1->SR1&=1<<1));//等待SR1.ADDR=1，从设备应答
clear=I2C1->SR1;
clear=I2C1->SR2;//SR1.ADDR清零
while(!(I2C1->SR1&=1<<6));//等待SR1.RxNE=1，接收到数据
I2C1->CR1 |= 1<<9; //I2C1产生停止条件
return I2C1->DR;
}
/*******************************************************************************
* Function Name : I2C1_ER_IRQHandler
* Description : This function handles I2C1 Error interrupt request.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void I2C1_ER_IRQHandler(void)
{
if(I2C1->SR1 & 1<<10) //应答失败
{
I2C1->SR1 &=~(1<<10); //清除中断
}
if(I2C1->SR1 & 1<<14) //超时
{
I2C1->SR1 &=~(1<<14); //清除中断
}
if(I2C1->SR1 & 1<<11) //过载/欠载
{
I2C1->SR1 &=~(1<<11); //清除中断
}
if(I2C1->SR1 & 1<<9) //仲裁丢失
{
I2C1->SR1 &=~(1<<9); //清除中断
}
if(I2C1->SR1 & 1<<8) //总线出错
{
I2C1->SR1 &=~(1<<8); //清除中断
}
} |
楼主
谢谢支持。
