I2C读取传感器数据问题

jxmuestc

我现在在用一款 Honeywell的温湿度传感器-HIH-6131-021-001，根据他家的datasheet，我写的程序不能正确读出来数据，下面直接说问题，贴代码。
获取该温湿度传感器数据包括两步：（1）主机通过I2C发送写传感器命令，传感器开始测量温湿度。（2）主机通过I2C发送读传感器命令，获取传感器温度。

[mw_shl_code=c,true]/*Read data from senesor*/ void Humi_Temp(void) { /*4 Byte to be read */ u16 NumByteToRead=0x04; u16 Humidity=0; u16 Temperature=0; u8 I2C_Buffer[4]={0x00,0x00,0x00,0x00}; I2C_SensorWrite(); /*Delay for measurement. The measurement cycle duration is typically 36.65 ms for temperature and humidity readings */ delay_xms(36); I2C_SensorRead(I2C_Buffer,NumByteToRead); /*I2C_Buffer[0-1]: Humidity I2C_Buffer[2-3]: Temperature Humidity(%)=Humidity_Output_Count/(2^14-2)*100% Temperature(Celsius)=Temperature_Output_Count/(2^14-2)*165-40 */ Humidity =((I2C_Buffer[0] & 0x3f) << 8 | I2C_Buffer[1])/(2^14-2)*100; Temperature = (((I2C_Buffer[2]<<8)|(I2C_Buffer[3]&0xfc))>>2)/(2^14-2)*165-40; delay_xms(20); USART_SendData(USART2,Humidity); delay_xms(20); USART_SendData(USART2,Temperature); } /*Send Measurement Request */ void I2C_SensorWrite(void) { /*send Measurement Request (MR) command to sensor */ /* While the bus is busy */ while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)){;} /* Enable the I2C1 Acknowledgement */ // I2C_AcknowledgeConfig(I2C1, ENABLE); /* Send START condition */ I2C_GenerateSTART(I2C1, ENABLE); /* Test on EV5 and clear it */ while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)){;} /* Send Measurement Request */ I2C_Send7bitAddress(I2C1, I2C1_SLAVE_ADDRESS7, I2C_Direction_Transmitter); /* Test on EV6 and clear it */ while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)){;} /*EV8*/ while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)){;} /* Send STOP Condition */ I2C_GenerateSTOP(I2C1, ENABLE); } /*read humidity and temperature */ void I2C_SensorRead(u8 *pBuffer,u16 NumByteToRead) { /*send read command to sensor */ /* While the bus is busy */ while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)){;} /* Enable the I2C1 Acknowledgement */ I2C_AcknowledgeConfig(I2C1, ENABLE); /*Send STRAT condition a second time */ I2C_GenerateSTART(I2C1, ENABLE); while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)){;} /* Read sensor data */ I2C_Send7bitAddress(I2C1, I2C1_SLAVE_ADDRESS7, I2C_Direction_Receiver); while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED)){;} /* While there is data to be read */ while(NumByteToRead) { if(NumByteToRead == 1) { /* Disable Acknowledgement */ I2C_AcknowledgeConfig(I2C1, DISABLE); /* Send STOP Condition */ I2C_GenerateSTOP(I2C1, ENABLE); } /* Test on EV7 and clear it */ if(I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED)) { /* Read a byte from the EEPROM */ *pBuffer = I2C_ReceiveData(I2C1); /* Point to the next location where the byte read will be saved */ pBuffer++; /* Decrement the read bytes counter */ NumByteToRead--; } } /* Enable the I2C1 Acknowledgement */ I2C_AcknowledgeConfig(I2C1, ENABLE); }[/mw_shl_code]

jxmuestc

问题已经解决了哈，我多写了
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)){;}                                                                       
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)){;}
这两行，去掉即可。