没有收到有关I2C总线的任何数据

如果出现了错误，消息“1”中的代码将挂起（I2C2STATBITS.RBF＝0）；如果前面的语句：I2C2CONBITS.RCEN返回到0，则没有接收到字节，那么等待RBF将无济于事。迈西尔



      以下为原文

    If there is something wrong, code shown in message #1 will hang in the
    while ( I2C2STATbits.RBF == 0); 
loop.
If a byte have not been received when the previous statement:     I2C2CONbits.RCEN    go back to 0,
then waiting for RBF will not help.

    if (I2C2STATbits.RBF == 0) //check for response
    {   __debug_break();

                    // test what went wrong

                    // what is value of I2C2STATbits.BCL

                    // what is value of I2C2STATbits.IWCOL

                    // what other values in I2C2STAT

        if (I2C2STATbits.S == 1)

            I2C_stop();

        return error;

    }  

 
   Mysil

如何在C30编译程序中写入上面的位是错误的。i2cIt.h：82：错误：“I2C2STATBITS”没有名为“RW”的成员。



      以下为原文

    I2C2STATbits.RW
 
how to write above bit in C30 compiler
I am getting error.
 
I2C_int.h:82: error: 'I2C2STATBITS' has no member named 'RW' 

您好，您可以尝试：I2C2STATBITS.RY-WOR I2C2STATBITS。RYNOTHOWWW，但是该位是由硬件设置和清除的只读状态位，因此在那里写入东西可能没有效果。迈西尔



      以下为原文

    Hi,
You may try:
    I2C2STATbits.R_W   
or
    I2C2STATbits.R_NOT_W
but that bit is a Read-only status bit that is set and cleared by hardware, so writing something there will likely have no effect.
 
   Mysil

我使用的是20MHz的外部晶体，什么值应该用II2C2BRG得到100kHz的时钟速率。



      以下为原文

    I am using 20Mhz external crystal what value should be use in I2C2BRG to get 100KHz clock rate.