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Altera_Forum
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15 years ago

What is the difference between main() and alt_main()?

I write a very simple program, driving LED through PIO. Both function can work. If using main() , the code size is 1940 bytes. If alt_main(), the code size is 472 bytes. It seems that main() include ...
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Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Hi sabertooth

I copy here the comment to alt_main() definition

/*

* alt_main is the C entry point for the HAL. It is called by the assembler

* startup code in the processor specific crt0.S. It is responsible for:

* completing the C runtime configuration; configuring all the

* devices/filesystems/components in the system; and call the entry point for

* the users application, i.e. main().

*/

Regards