Conventions

In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "This avoids having to include a special module and an overlay that loads commands in your init.{ro.hardware}.rc file."

A block of code is set as follows:

extern int openFRAM(const unsigned int bus, const unsigned int address);
extern int readFRAM(const unsigned int offset, const unsigned int 
    bufferSize, const char *buffer);
extern int writeFRAM(const unsigned int offset, const unsigned int 
    const char *buffer);
extern void closeFRAM(void);

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

public void onClickSaveButton(View view) {
   hwTask = new HardwareTask();
   hwTask.saveToFRAM(this);  
}
    
public void onClickLoadButton(View view) {
   hwTask = new HardwareTask();
   hwTask.loadFromFRAM(this);
}

Any command-line input or output is written as follows:

root@beagleboneblack:/ # i2cdetect -y -r 2

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "If the user clicks on the Sample button once more, another HardwareTask instance is instantiated."

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.