运营商与QUOT; |＆QUOT;用法是C PI咂舌 [英] Operator "|" usage is c raspberry pi

问题描述

我使用的树莓派读取数据的陀螺仪。是新来的，但到目前为止，据我所知，我从除了利用我的基础code一切|在里面。
当寻找它，它说，它按位或运算符但在我的情况它没有什么意义，不是再次我不明白，在维基百科上的解释。

这是使用它看起来如下行

 参考readBlock（0x80的| OUT_X_L_G，sizeof的（块），块）;
 

参考readBlock是用户自定义函数如下：

 参考readBlock（uint8_t有命令，uint8_t有大小，uint8_t有*数据）{
INT结果= i2c_smbus_read_i2c_block_data（文件，命令，大小的数据）;
}
 

解决方案

这位前pression 0x80的| OUT_X_L_G 与位数返回 OUT_X_L_G 的值 7 设置：

  OUT_X_L_G = XXXX XXXX
  按位或
0x80的= 1000 0000
---------------------
结果= 1XXX XXXX
 

整个函数调用背后的逻辑应该由你不提供上下文来决定。

I am using raspberry pi to read a gyroscopic data. Am new to it but so far I understand everything that I am basing my code from besides the use of "|" in it. When looking it up it says its "bitwise OR" operator but in my situation it doesnt make sense, than again I don't understand the explanation on Wikipedia.

The line that uses it looks as follows

readBlock(0x80 | OUT_X_L_G, sizeof(block), block);

readBlock is user defined function as follows.

readBlock(uint8_t command, uint8_t size, uint8_t *data) {
int result = i2c_smbus_read_i2c_block_data(file, command, size, data);
}

解决方案

The expression 0x80 | OUT_X_L_G is returning a value of OUT_X_L_G with a bit number 7 set:

OUT_X_L_G = xxxx xxxx
  bitwise or
0x80      = 1000 0000
---------------------
result    = 1xxx xxxx

The logic behind the whole function call should be determined by the context you are not providing.

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