/* ---------------------------------------------------------------------------- | |
* ATMEL Microcontroller Software Support | |
* ---------------------------------------------------------------------------- | |
* Copyright (c) 2008, Atmel Corporation | |
* | |
* All rights reserved. | |
* | |
* Redistribution and use in source and binary forms, with or without | |
* modification, are permitted provided that the following conditions are met: | |
* | |
* - Redistributions of source code must retain the above copyright notice, | |
* this list of conditions and the disclaimer below. | |
* | |
* Atmel's name may not be used to endorse or promote products derived from | |
* this software without specific prior written permission. | |
* | |
* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR | |
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE | |
* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, | |
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, | |
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, | |
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
* ---------------------------------------------------------------------------- | |
*/ | |
#include "ISR_Support.h" | |
/* | |
IAR startup file for AT91SAM9XE microcontrollers. | |
*/ | |
MODULE ?cstartup | |
;; Forward declaration of sections. | |
SECTION IRQ_STACK:DATA:NOROOT(2) | |
SECTION CSTACK:DATA:NOROOT(3) | |
//------------------------------------------------------------------------------ | |
// Headers | |
//------------------------------------------------------------------------------ | |
#define __ASSEMBLY__ | |
#include "board.h" | |
//------------------------------------------------------------------------------ | |
// Definitions | |
//------------------------------------------------------------------------------ | |
#define ARM_MODE_ABT 0x17 | |
#define ARM_MODE_FIQ 0x11 | |
#define ARM_MODE_IRQ 0x12 | |
#define ARM_MODE_SVC 0x13 | |
#define ARM_MODE_SYS 0x1F | |
#define I_BIT 0x80 | |
#define F_BIT 0x40 | |
//------------------------------------------------------------------------------ | |
// Startup routine | |
//------------------------------------------------------------------------------ | |
/* | |
Exception vectors | |
*/ | |
SECTION .vectors:CODE:NOROOT(2) | |
PUBLIC resetVector | |
PUBLIC irqHandler | |
EXTERN Undefined_Handler | |
EXTERN vPortYieldProcessor | |
EXTERN Prefetch_Handler | |
EXTERN Abort_Handler | |
EXTERN FIQ_Handler | |
ARM | |
__iar_init$$done: ; The interrupt vector is not needed | |
; until after copy initialization is done | |
resetVector: | |
; All default exception handlers (except reset) are | |
; defined as weak symbol definitions. | |
; If a handler is defined by the application it will take precedence. | |
LDR pc, =resetHandler ; Reset | |
LDR pc, Undefined_Addr ; Undefined instructions | |
LDR pc, SWI_Addr ; Software interrupt (SWI/SVC) | |
LDR pc, Prefetch_Addr ; Prefetch abort | |
LDR pc, Abort_Addr ; Data abort | |
B . ; RESERVED | |
LDR pc, =irqHandler ; IRQ | |
LDR pc, FIQ_Addr ; FIQ | |
Undefined_Addr: DCD Undefined_Handler | |
SWI_Addr: DCD vPortYieldProcessor | |
Prefetch_Addr: DCD Prefetch_Handler | |
Abort_Addr: DCD Abort_Handler | |
FIQ_Addr: DCD FIQ_Handler | |
/* | |
Handles incoming interrupt requests by branching to the corresponding | |
handler, as defined in the AIC. Supports interrupt nesting. | |
*/ | |
irqHandler: | |
portSAVE_CONTEXT | |
/* Write in the IVR to support Protect Mode */ | |
LDR lr, =AT91C_BASE_AIC | |
LDR r0, [r14, #AIC_IVR] | |
STR lr, [r14, #AIC_IVR] | |
/* Branch to C portion of the interrupt handler */ | |
MOV lr, pc | |
BX r0 | |
/* Acknowledge interrupt */ | |
LDR lr, =AT91C_BASE_AIC | |
STR lr, [r14, #AIC_EOICR] | |
portRESTORE_CONTEXT | |
/* | |
After a reset, execution starts here, the mode is ARM, supervisor | |
with interrupts disabled. | |
Initializes the chip and branches to the main() function. | |
*/ | |
SECTION .cstartup:CODE:NOROOT(2) | |
PUBLIC resetHandler | |
EXTERN LowLevelInit | |
EXTERN ?main | |
REQUIRE resetVector | |
ARM | |
resetHandler: | |
/* Set pc to actual code location (i.e. not in remap zone) */ | |
LDR pc, =label | |
/* Perform low-level initialization of the chip using LowLevelInit() */ | |
label: | |
LDR r0, =LowLevelInit | |
LDR r4, =SFE(CSTACK) | |
MOV sp, r4 | |
MOV lr, pc | |
BX r0 | |
/* Set up the interrupt stack pointer. */ | |
MSR cpsr_c, #ARM_MODE_IRQ | I_BIT | F_BIT ; Change the mode | |
LDR sp, =SFE(IRQ_STACK) | |
/* Set up the SVC stack pointer. */ | |
MSR cpsr_c, #ARM_MODE_SVC | F_BIT ; Change the mode | |
LDR sp, =SFE(CSTACK) | |
/* Branch to main() */ | |
LDR r0, =?main | |
MOV lr, pc | |
BX r0 | |
/* Loop indefinitely when program is finished */ | |
loop4: | |
B loop4 | |
END |