STM8L101硬件I2C 检测不到起始位

只看该作者 · 2017-1-13 09:17

我在调试I2C的时候，无法产生起始位我把代码贴出来大家看看！
I2C_Init(I2C_MAX_STANDARD_FREQ, 0x86,I2C_DutyCycle_2, I2C_Ack_Disable, I2C_AcknowledgedAddress_7bit);

UINT8 I2C_AM_Byte_Read(UINT8 device_address, UINT16 reg_add)

{

   UINT8 readdata,Temp;

   UINT8 add_H,add_L;

   add_H = reg_add>>8;

   add_L = reg_add & 0x00FF;

   while(I2C->SR3&0x02);//BUS EMPTY

   LED1ON;

   //I2C_GenerateSTART(ENABLE);

   I2C->CR2 |= 0x01;    //发送起始位

      //while(!(I2C->CR2&0x01)); 这句我注释掉了，但是不注释也过不去  手册上说是发送完成自动清0。（数据手册说明：START: This bit is set and cleared by software and cleared by hardware when start is sent or PE=0.）

   while(!(I2C->SR1&0x01));//  等待起始发送完成，但是在这儿一直卡着过不去。（数据手册说明：SB: Start Bit (Master mode)    0: No Start condition1: Start condition generated.）

   Temp = I2C->SR1;

      LED2ON;

   I2C_Send7bitAddress(device_address, I2C_Direction_Transmitter);

   while(!(I2C->SR1&0x02));//ADDR==1

   Temp = I2C->SR1;

   Temp = I2C->SR3;



   I2C_SendData(add_H);

   while(!(I2C->SR1&0x84));//TXE==1

   I2C_SendData(add_L);

   while(!(I2C->SR1&0x84));





   I2C_GenerateSTART(ENABLE);

   while(!(I2C->SR1&0x01));//SB==1

   I2C_Send7bitAddress(device_address, I2C_Direction_Receiver);

   while(!(I2C->SR1&0x02));//ADDR==1

   Temp = I2C->SR1;

   Temp = I2C->SR3;

   while(!(I2C->SR1&0x40));//RXE==1

   readdata = I2C_ReceiveData();

   I2C_GenerateSTOP(ENABLE);

}