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Startup Code Basic I/O Memory Allocation Interfacing C to Assembler Function Parameters Function Return Values Using the SRC Directive Register Usage Example Routines ARM Code Example Thumb Code Example Data Storage Formats Byte Order Byte Alignment Integer Scalars 1-Byte Scalars 2-Byte Scalars 4-Byte Scalars 8-Byte Scalars float Scalars float Format float Errors double Scalars double Format double Errors Pointers Bit Fields Absolute Memory Access The __at Keyword Linker Location Controls Error Messages Library Reference AppendixStartup Code
Startup Code is the program code that executes immediately after reset. The startup code includes:
- The Reset Vector.
- Interrupt and Fast Interrupt Vectors.
- Code to Clear Memory.
- Code to Initialize Global Variables.
There are several different folders available (in \KEIL\ARM\STARTUP\) that include the startup code (STARTUP.S) for various ARM device variants. You should include a copy of the appropriate startup file in your project.
- \KEIL\ARM\STARTUP\ADI\STARTUP.S contains the startup code for Analog Devices ADuC702x chips.
- \KEIL\ARM\STARTUP\ATMEL\STARTUP.S contains the startup code for Atmel AT91 devices.
- \KEIL\ARM\STARTUP\PHILIPS\STARTUP.S contains the startup code for the Philips LPC2000 devices.
- \KEIL\ARM\STARTUP\SHARP\STARTUP.S contains the startup code for the Sharp LH754xx devices.
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