How do you want this error, please everyone help to

CodePudding user response:

Variables defined function declaration before the call, such as the void main (void) on the bottom

CodePudding user response:

Variable getdata, array dispbuf [] no definition, suggests the building Lord hurriedly to learn C language,

CodePudding user response:

If it is a global variable you less files, if not you can't declare...

CodePudding user response:

First sound next use

CodePudding user response:

Getdata, define a variable first and then you can use,
For example, unsigned int getdata

After the proposal writing code to a format:
//include the header file
XXXXXX
//define a global variable
XXXXXX
//declare external variable
XXXXXX
//seed function declaration
XXXXXX
//the main function
Void main ()
{
//variable definition
XXXXXX
//peripheral initialization
XXXXXX

Infinite loop
While (1)
{
XXXXXX
}

}
//each seed function
XXXXXX
I hope it can help you,

CodePudding user response:

You put the function declaration

CodePudding user response:

Basic knowledge of code look at a book club

CodePudding user response:

File or less variables defined in the function below the definition or not