Stack_Size      EQU     0x00000400							; 256KB of STACK

                AREA    STACK, NOINIT, READWRITE, ALIGN=4
Stack_Mem       SPACE   Stack_Size
__initial_sp


Heap_Size       EQU     0x00000400 							; 1MB of HEAP

                AREA    HEAP, NOINIT, READWRITE, ALIGN=4
__heap_base
Heap_Mem        SPACE   Heap_Size
__heap_limit


; Vector Table Mapped to Address 0 at Reset

						PRESERVE8
                		THUMB

        				AREA	RESET, DATA, READONLY
        				EXPORT 	__Vectors
					
__Vectors		    	DCD		0x0000FFFC
        				DCD		Reset_Handler
        				DCD		0  			
        				DCD		0
        				DCD		0
        				DCD		0
        				DCD		0
        				DCD		0
        				DCD		0
        				DCD		0
        				DCD		0
        				DCD 	0
        				DCD		0
        				DCD		0
        				DCD 	0
        				DCD		0
        				
        				; External Interrupts
						        				
        				DCD		Timer_Handler
        				DCD		UART_Handler
        				DCD		0
        				DCD		0
        				DCD		0
        				DCD		0
        				DCD		0
        				DCD		0
        				DCD		0
        				DCD		0
        				DCD		0
        				DCD		0
        				DCD		0
        				DCD		0
        				DCD		0
        				DCD		0
              
                AREA |.text|, CODE, READONLY
;Reset Handler
Reset_Handler   PROC
                GLOBAL Reset_Handler
                ENTRY
				IMPORT  __main
                LDR     R0, =__main               
                BX      R0                        ;Branch to __main
                ENDP

Timer_Handler   PROC
                EXPORT Timer_Handler
				IMPORT Timer_ISR
                PUSH    {R0,R1,R2,LR}
				BL Timer_ISR
                POP     {R0,R1,R2,PC}                    ;return
                ENDP

UART_Handler    PROC
                EXPORT UART_Handler
				IMPORT UART_ISR
                PUSH    {R0,R1,R2,LR}
				BL UART_ISR
                POP     {R0,R1,R2,PC}
                ENDP

				ALIGN 		4					 ; Align to a word boundary

; User Initial Stack & Heap
                IF      :DEF:__MICROLIB
                EXPORT  __initial_sp
                EXPORT  __heap_base
                EXPORT  __heap_limit
                ELSE
                IMPORT  __use_two_region_memory
                EXPORT  __user_initial_stackheap
__user_initial_stackheap

                LDR     R0, =  Heap_Mem
                LDR     R1, =(Stack_Mem + Stack_Size)
                LDR     R2, = (Heap_Mem +  Heap_Size)
                LDR     R3, = Stack_Mem
                BX      LR

                ALIGN

                ENDIF

		END