I2C未正确接收值

I2C*MaultRead字节（I2CYACKYDATA）和lt；lt；8将总是导致0（零）。你需要一个类型的演员
（In16）I2C*MaultRead字节（I2CYACKYDATA）& lt；lt；8
字节I2C接口非常简单：在建立组件后，开始使用它
I2CyMasksEngESTEnter（DeVice地址，I2CX Read EXXFIX模式）；/初始化事务处理
I2CJMistWrreEngEnter（寄存器）；/ /指示要写入哪个寄存器
I2C.MistWrrestEngEnter字节（值）；//写入寄存器
I/CyMasksEdStestStor（；）/ /事务结束
当您想从使用的设备读取时（读取两个字节的示例）
I2CyMasksEngESTEnter（DeVice地址，I2CX Read EXXFIX模式）；/初始化事务处理
I2C.MistMraveScript（寄存器）；/ /指示要写入哪个寄存器
I2C.MaskestEntRead（DeVice地址，I2CX Read x Felx模式）；
I2C*MaultRead字节（I2CYACKYDATA）；/从寄存器读取
I2C*MaultRead字节（I2CnNaKi数据）；/ /从寄存器读取，最后字节是裸的
I/CyMasksEdStestStor（；）/ /事务结束
不太难。请记住，大多数API（除了读取字节之外）都返回一个状态字节，当非零指示错误条件时。
鲍勃



     以下为原文
  I2C_MasterReadByte(I2C_ACK_DATA) << 8 will always result in 0 (zero). You need a type cast as
 
(int16)I2C_MasterReadByte(I2C_ACK_DATA) << 8
 
Byte I2C interface is quite simple: After setting up the component and starting it you use
 
    I2C_MasterSendStart(DeviceAddress,I2C_WRITE_XFER_MODE);    // Initialize a transaction for writing
    I2C_MasterWriteByte(Register);                // Indicate which register you want to write to
    I2C_MasterWriteByte(Value);                // Write to register
    I2C_MasterSendStop();                    // End of transaction
 
When you want to read from a device you use (example for reading two bytes
 
    I2C_MasterSendStart(DeviceAddress,I2C_WRITE_XFER_MODE);    // Initialize a transaction for writing
    I2C_MasterWrite(Register);                // Indicate which register you want to write to
    I2C_MasterSendRestart(DeviceAddress,I2C_READ_XFER_MODE);
    I2C_MasterReadByte(I2C_ACK_DATA);            // Read from register
    I2C_MasterReadByte(I2C_NAK_DATA);            // Read from register, last byte is NAKed
    I2C_MasterSendStop();                    // End of transaction
 
Not too difficult. Keep in mind that most of the APIs (except those for reading a byte) return a status byte which, when non-zero indicate an error condition.
 
Bob

我已经提出了一些你的建议。原来的工作空间似乎已经损坏，所以我重新写出来，并附上了一个新版本的副本。我不想把数据保存为16位值，而是尝试将每个字节保存到它自己的变量中，然后我会担心16位值。再一次，它仍然正确地运行在范围内，但是UC不保存返回给它的值。在SPI通信中，我也遇到过类似的问题，归结为检查UC在开始另一个命令之前已经读完了一个字节。会添加类似于这里需要的东西，这样的线吗？
（（I2C.MistMistStudio））；= I2CYMSTATIO-RDY-CMPLT）
GROWRK.SARVEVE01.ZIP
1.4兆字节



     以下为原文
  I have implemented some of your suggestions.  The original work space seems to have corrupted so I re-wrote it out and attached a copy of the new version.  Instead of trying to have the data saved as 16 bit values, I am trying to just get each byte saved to its own variable and I will worry about 16 bit values afterward.  Again it is still running correctly looking on the scope, but the uC is not saving the values returned to it.  I had a similar problem once with SPI communication, and it came down to having a check for making sure the uC had finished reading a byte before beginning another command.  Would adding something similar to that be required here, a line something like this?
 
while((I2C_MasterStatus() & I2C_MSTAT_RD_CMPLT) != I2C_MSTAT_RD_CMPLT)

•   Gyro_Tester.cywrk.Archive01.zip 1.4 MB  
  
  

在这个周末再看一遍之后，我发现问题的一部分是我使用的双向电平移位器将不能与I2C一起工作。我使用的是TXB0104，并被I2C上拉电阻弄糊涂了。我切换到一个简单的基于MOSFET的双向电平移位器来对抗这个，这是最终的代码；
谢谢你的帮助。
Cyr.Test.CyWrk.CaseV01.Zip
1.4兆字节



     以下为原文
  After looking it over again this weekend, I found that part of the problem is the bidirectional level shifter I was using will not work with I2C.  I was using a TXB0104 and gets confused by the I2C pull up resistors.  I switched to a simple MOSFET based bidirectional level shifter to combat this and this was the final code;
 
 
 
Thanks for the help.

•   Gyro_Test.cywrk.Archive01.zip 1.4 MB