Atmel development board provides a reference procedure, you can use open source tools for development, the Edit link. This is one package. Demonstrated with LED

demo_at91sam7_blink_flash
.........................\AT91SAM7S256.h
.........................\blinker.c
.........................\Board.h
.........................\crt.s
.........................\demo_at91sam7_blink_flash.cmd
.........................\isrsupport.c
.........................\libc.a
.........................\libgcc.a
.........................\libm.a
.........................\lowlevelinit.c
.........................\main.c
.........................\makefile
.........................\math.h
.........................\script.ocd
.........................\stdlib.h
.........................\string.h
.........................\timerisr.c
.........................\timersetup.c
Using Open Source Tools for AT91SAM7S Cross Development revision C.pdf

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