How to locate the subroutine segment at a fixed address in KeilC51

If you want to place the function int BIN2HEX(int xx)
{
  ...
} in the C source file tools.c
at 0x1000 in CODE MEMORY, compile the project first, then open the M51 file of the project, and find the name of the function to be located under the line
* * * CODE MEMORY * * * , which should be in the form of: CODE xxxxH xxxxH UNIT ?PR?_BCD2HEX?TOOLS Then fill in the following content in: Project->Options for Target ...->BL51 Locate: Code : ?PR?_BCD2HEX?TOOLS(0x1000) Build again, and you will find that the function has been placed at 0x1000 in CODE MEMORY in M51.

2. Locating variables with initial values:
To locate a variable at an absolute position and assign an initial value, _at_ cannot be used to complete the task. Then do the following:
Create a new file in the project, such as InitVars.c, and assign an initial value to the variable to be processed (assuming it is a code variable):
char code myVer = {"COPYRIGHT 2001-11"};
then add the file to the project, compile, open the M51 file, if the defined type is code, you can find the following under
* * * CODE MEMORY * * * : CODE xxxxH xxxxH UNIT ?CO?INITVARS then in: Project->Options for Target ...->BL51 Locate: Code, fill in: ?CO?INITVARS(0x200) and compile again.

Correspondingly, if it is an xdata variable, write in InitVars.c:
char xdata myVer = {"COPYRIGHT 2001-11"};
then add the file to the project, compile, open the M51 file, and under
* * * XDATA MEMORY * * *
, you can find:
XDATA xxxxH xxxxH UNIT ?XD?INITVARS
Then fill in: ?XD?INITVARS(0x200) in:
Project->Options for Target ...->BL51 Locate: Xdata and compile again. Correspondingly, if the variables defined are data/idata, then handle them accordingly.

3. If there are multiple variables or functions to be located at absolute addresses, they should be arranged in order from low to high addresses.