Some Tips on Adding Version Number of SCM

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Some Tips on Adding Version Number of SCM

2023-04-13

Usually we write a program, usually note the software version, then, how to save the version information in the microcontroller?

There are many methods, but the basic principle is to write in the specified storage area (Flash).Software versionInformation.

Implementation method

Here is one of the most common and basic tips:inKeil MDKUnder the environment, through software code, directly mapped to and stored to the Flash specified address.

Include: software version, compile date, compile time ,Here's the code:

#  define   VERINFO_ADDR_BASE   (0x0800FF00) / / The address where the flash is stored
const char Software_Ver[] __attribute__((at(VERINFO_ADDR_BASE +  0x00  )))  =  "Software: 1.0.0"  ;const char Compiler_Date[] __attribute__((at(VERINFO_ADDR_BASE +  0x40  ))) =  "Date: "  __DATE__;const char Compiler_Time[] __attribute__((at(VERINFO_ADDR_BASE +  0x60  ))) =  "Time: "  __TIME__;

Can anyone understand this code?

The principle is simple, and there are similar ways to write Flash addresses (not described here).

This contains several important knowledge points, which are described below.

Key words _ _ attribute _ _ _

Attribute, translated as "attribute," in C, is a keyword with the grammatical form of :

__attribute__ ((attribute-  list  ))

_ _ attribute _ _ Function attribute, variable attribute, and type attribute can be set.

This part of the content, we can do not have to understand in depth, know that this can be used. To understand deeply, there are also a lot of learning resources on the Internet.

C language standard definition

In the code:

const char Compiler_Date[] __attribute__((at(VERINFO_ADDR_BASE +  0x40  ))) =  "Date: "  __DATE__;const char Compiler_Time[] __attribute__((at(VERINFO_ADDR_BASE +  0x60  ))) =  "Time: "  __TIME__;

You will see_ _ DATE _ _ andThe date and time represented by _ _ TIME _ _.

In fact, these two are special standard definitions of C language.

__DATE__: Compile the date character string of the moment as in "Apr13 2021"

__TIME__Compile time character string as "20: 00: 00"

In addition to these two, there are actually many similar standard definitions, such as:

__FILE__ : The file name of the file being compiled

__LINE__ : The line number of the file being compiled

__STDC__: Determine if the document is standard C procedure

You can see this in my article:Definition and Usage of Several Special Standards of C Language

Always compile version files

In the Keil MDK, by default, the source file is not modified and is compiled only once.

Therefore, to compile the version, date, and time correctly, you need to set this: Always compile .

Set as follows:

Firmware size

The generated Hex file will fill in the unused Falsh with 0x00, for example:

After padding 0x00, the hex is relatively large, so there are two ways to reduce the hex firmware size.

1. Store FLASH address, to set in the appropriate location, if the amount of code is only 1K, you only in the offset 50K address, so too much offset.

#  define   VERINFO_ADDR_BASE   (0x0800FF00) / / The address where the flash is stored

2. There is also a way online to modify the "ROM size":

After the small, I found that I really removed 0x00:

These two methods, in fact, have a certain risk, if the amount of code is increasing, there may be problems. So, we have to set the main flash address.

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