Nios® V Processor Software Developer Handbook

ID 743810
Date 5/26/2023
Public

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7.9.1. Header Files and alt_sys_init.c

At the heart of the HAL is the autogenerated source file, alt_sys_init.c. This file contains the source code that the HAL uses to initialize the device drivers for all supported devices in the system. In particular, this file defines the alt_sys_init() function, which is called before main() to initialize device drivers software packages, and make them available to the program.

When you create the driver or software package, you specify in a Tcl script whether you want the alt_sys_init() function to invoke your INSTANCE and INIT macros.

For more information, refer to the Enabling Software Initialization chapter.

Note: The remainder of this section assumes that you are using the alt_sys_init() HAL initialization mechanism.