eternauta3k, thanks for your reply.
for example, I want to blink RGB diode, ie just enable RED( on LM4F120 LaunchPad Evaluation Board pin PIN_29 ( PF1 ) I want set to low ).
.type _blink_rgb_red, %function
/* set PF1 as output */
mov r0, #0x02
ldr r1, =0x40025400
/* set PF1 data to 0 */
mov r0, #0
ldr r1, =0x40025000
but it not working, because after boot program counter in not valid and it = 0 on startup while in flash address 4 offset is valid address.
here is my source code(attached).
Help me pl