How can you change the control buttons of the Genesis Plus DC emulator in the 1ST_Read.bin ?

[Serj2DC]

Sorry for my English. The text is translated through Google translator.
I burned a CD that contains the Genesis Plus DC emulator with a collection of Genesis games that can be played on my Dreamcast. The emulator only uses the D-pad buttons (they don't work well on my controller).
I found the source code of the emulator, where the button codes (D-PAD) seem to be written.
How can I change the codes in the 1st_read.bin file itself so that I can play with an analog stick? Can anyone tell me the codes for pressing the analog stick?

This is what is written in the source code:

#define INPUT_LEFT (0x00000008)..
#define INPUT_RIGHT (0x00000004)..
#define INPUT_DOWN (0x00000002)..
#define INPUT_UP (0x00000001)

[Serj2DC]

Here are the emulator sources
https://www.zophar.net/consoles/dreamca ... us-dc.html