MakefileBasedBuild/Atmel/sam3x/sam3x-ek/libraries/usb_device/class/dfu/device/atmel/isp/xmega/atxmega256a3bu/iar/cstartup.s90

;----------------------------------------------------------------------------
;
;   This module contains the AVR C and EC++ startup
;
;   File version:   $Revision: 6648 $
;
;----------------------------------------------------------------------------


#include "macros.m90"

#define SWITCHPORT	PORTF
#define SWITCHPIN		0

#define PORTF 0x06A0
#define DIR	0
#define DIRSET 1
#define DIRCLR 2
#define DIRTGL 3
#define PORT_OUT 4
#define OUTSET 5
#define OUTCLR 6
#define OUTTGL 7
#define PORT_IN 8
#define INTCTRL 9
#define INT0MASK 10
#define INT1MASK 11
#define INTFLAGS 12
#define reserved_0x0D 13
#define reserved_0x0E 14
#define reserved_0x0F 15
#define PIN0CTRL 16

	

;----------------------------------------------------------------------------
; Set up the RESET segment with a reset vector
;----------------------------------------------------------------------------
		  MODULE    ?RESET
		  EXTERN  ?C_STARTUP
		  PUBLIC  __program_start
		  PUBLIC  ?RESET

	ASEG	0x40000
__program_start:
?RESET:
	 RJMP    ?C_STARTUP

		  ENDMOD

;----------------------------------------------------------------------------
; Set up the INTVEC segment with a reset vector
;----------------------------------------------------------------------------
		  MODULE    ?VECT
		  COMMON  INTVEC:CODE:ROOT(1) ; Align at an even address
		  EXTERN  ?C_STARTUP
		  ENDMOD

;----------------------------------------------------------------------------
; Forward declarations of segments used in initialization
;----------------------------------------------------------------------------
	 RSEG    CSTACK:DATA:NOROOT(0)
	 RSEG    RSTACK:DATA:NOROOT(0)

;----------------------------------------------------------------------------
; Perform C initialization
;----------------------------------------------------------------------------
	 MODULE  ?C_STARTUP
	 EXTERN  __segment_init
	 EXTERN  main
	 EXTERN  exit
	 EXTERN  _exit

;----------------------------------------------------------------------------
; If the return address stack is located in external SRAM, make sure that
; you have uncommented the correct code in __low_level_init!!!
;----------------------------------------------------------------------------
	 RSEG    CODE:CODE:NOROOT(1)
	 PUBLIC  ?C_STARTUP
	 PUBLIC  __RESTART
	 EXTERN ?RESET

__RESTART:
?C_STARTUP:
#if A90_POINTER_REG_SIZE > 2
	 PUBLIC  ?zero_reg_initialization
?zero_reg_initialization:
	 CLR R15
	 OUT RAMPD,R15
#endif
	 REQUIRE ?SETUP_STACK
	 REQUIRE ?RESET
	 RSEG    CODE:CODE:NOROOT(1)
	 PUBLIC  __RSTACK_in_external_ram
__RSTACK_in_external_ram:
	 LDI     R16,0xC0
	 OUT     0x35,R16    ;Enable the external SRAM with a wait state

	 RSEG    CODE:CODE:NOROOT(1)
	 PUBLIC  __RSTACK_in_external_ram_new_way
	 EXTERN  __?XMCRA

__RSTACK_in_external_ram_new_way:
	 LDI     R16,0x8C        ;SRE=1,SRL2=0,SRL1=0,SRL0=0,SRW11=1,SRW10=1,SRW01=0,SRW00=0
	 STS     __?XMCRA,R16    ;Enable the external SRAM with maximum wait state.

;----------------------------------------------------------------------------
; Set up the CSTACK and RSTACK pointers.
;----------------------------------------------------------------------------
	 RSEG    CODE:CODE:NOROOT(1)
?SETUP_STACK:
	 ;; Return address stack (RSTACK)
	 LDI R16,LOW(SFE(RSTACK)-1)
	 OUT 0x3D,R16
#if A90_POINTER_REG_SIZE > 1
	 LDI R16,HIGH(SFE(RSTACK)-1)
	 OUT 0x3E,R16
#endif

	 ;; Data stack (CSTACK)
	 LDI Y0,LOW(SFE(CSTACK))
#if A90_POINTER_REG_SIZE > 1
#if MEMORY_MODEL == TINY_MEMORY_MODEL
	 LDI Y1,0
#else
	 LDI Y1,HIGH(SFE(CSTACK))
#endif
#if A90_POINTER_REG_SIZE > 2
	 LDI Z0,HWRD(SFB(CSTACK))
	 OUT     RAMPY,Z0
#endif
#endif

#if A90_POINTER_REG_SIZE > 2
; Nothing here, the things previously here has been done earlier.
#else
;	 REQUIRE ?call_low_level_init

;----------------------------------------------------------------------------
; Clear R15 so that it can be used as zero register by the code generator.
; The compiler will emit a "REQUIRE ?zero_reg_initialization" statement if
; this optimization has been enabled.
;----------------------------------------------------------------------------
	 RSEG    CODE:CODE:NOROOT(1)
	 PUBLIC  ?zero_reg_initialization

?zero_reg_initialization:
	 CLR R15


;----------------------------------------------------------------------------
; Call __low_level_init to do low level initializatons. Modify the supplied
; __low_level_init module to add your own initialization code or to
; remove segment initialization (by returning 0).
;----------------------------------------------------------------------------
	 RSEG    CODE:CODE:NOROOT(1)
#endif
	 REQUIRE ?cstartup_call_main

;----------------------------------------------------------------------------
; Call __segment_init to initialize segments.
;----------------------------------------------------------------------------

	 RSEG    CODE:CODE:NOROOT(1)
	PUBLIC  ?need_segment_init
	EXTERN start_app_key
	EXTERN nvm_flash_read_byte
	
	// BOOT PROCESS MANAGEMENT .....
	STS     (SWITCHPORT+DIR), R15
	LDI	  R16,0x18
	STS	  (SWITCHPORT+PIN0CTRL+SWITCHPIN), R16
	LDI	  R16,0xFF
temp0:
	DEC	  R16
	TST 	  R16
	BRNE    temp0
	LDS	  R16,(SWITCHPORT+PORT_IN)
	SBRS    R16,SWITCHPIN 		// test DFU pin active
	RJMP	  start_boot			// pin  activated
	//test blank ?
	LDI     R30, 0
	LDI     R31, 0
	ELPM    R16, Z+
	ELPM    R17, Z
	CPI     R16, 255
	BRNE    start0
	CPI     R17, 255
	BRNE    start0
start_boot:
?need_segment_init:
	XCALL   __segment_init


;----------------------------------------------------------------------------
;   Call main
;----------------------------------------------------------------------------
	 RSEG    CODE:CODE:NOROOT(1)

	 PUBLIC  ?cstartup_call_main

?cstartup_call_main:
	 RCALL   main
start0:
	 STS	  (SWITCHPORT+PIN0CTRL+SWITCHPIN), R15
jump0:
	 JMP 0
	 END

;----------------------------------------------------------------------------
;