What are the contents of the map file

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The contents of MAP files generated by MDK compilation can be divided into five categories. This issue introduces the first three categories.

1.Section Cross References

Section Cross References: module, segment (entry) cross-reference. This section refers to the reference relationship between modules and segments (defined entries) generated by each source file.

App_main.o (.text) refers to app_fun.o (.text) for Communication_Test (

The text function (.text) in the app_main module (app_main.o) references (or calls) the text function in the app_fun module (app_fun.o).)

2.Removing Unused input sections from the image

Unused module

The last line of information in the figure above is "2 unused section (s) (total 9 bytes) removed from the image". Indicates that a total of 2 pieces of content have not been called, with a size of 9 bytes.

3.Image Symbol Table

Mapping symbol tables are divided into two categories: Local Symbols local and 2.Global Symbols global.

Analysis of each part:

1) .Symbol Name: symbol name

2) .value: stores the corresponding address

3) .Ov Type: the type corresponding to the symbol (Number, Section, Thumb Code, Data, etc.)

4) .size: storage size

5) .object (Section): segment target

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