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;******************** (C) COPYRIGHT 2005 STMicroelectronics ********************
;* File Name : 91x_vect.s
;* Author : MCD Application Team
;* Date First Issued : 10/25/2005 : Beta Version V0.1
;* Description : This File used to initialize the exception and IRQ
;* vectors, and to enter/return to/from exceptions
;* handlers.
;*******************************************************************************
; History:
; 10/25/2005 : Beta Version V0.1
;*******************************************************************************
; THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS WITH
; CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. AS
; A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT, INDIRECT
; OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE CONTENT
; OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING INFORMATION
; CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
;******************************************************************************/
#include "FreeRTOSConfig.h"
#include "ISR_Support.h"
MODULE ?RESET
COMMON INTVEC:CODE(2)
CODE32
EXPORT LINK
VectorAddress EQU 0xFFFFF030 ; VIC Vector address register address.
VectorAddressDaisy EQU 0xFC000030 ; Daisy VIC Vector address register
; address.
LINK EQU 0x0
I_Bit EQU 0x80 ; when I bit is set, IRQ is disabled
F_Bit EQU 0x40 ; when F bit is set, FIQ is disabled
;*******************************************************************************
; MACRO
;*******************************************************************************
;*******************************************************************************
; Import the __program_start address from 91x_init.s
;*******************************************************************************
IMPORT __program_start
;*******************************************************************************
; Import exception handlers
;*******************************************************************************
IMPORT vPortYieldProcessor ; FreeRTOS SWI handler
;*******************************************************************************
; Export Peripherals IRQ handlers table address
;*******************************************************************************
;*******************************************************************************
; Exception vectors
;*******************************************************************************
LDR PC, Reset_Addr
LDR PC, Undefined_Addr
LDR PC, SWI_Addr
LDR PC, Prefetch_Addr
LDR PC, Abort_Addr
NOP ; Reserved vector
LDR PC, IRQ_Addr
LDR PC, FIQ_Addr
;*******************************************************************************
; Exception handlers address table
;*******************************************************************************
Reset_Addr DCD __program_start
Undefined_Addr DCD UndefinedHandler
SWI_Addr DCD vPortYieldProcessor
Prefetch_Addr DCD PrefetchAbortHandler
Abort_Addr DCD DataAbortHandler
DCD 0 ; Reserved vector
IRQ_Addr DCD IRQHandler
FIQ_Addr DCD FIQHandler
;*******************************************************************************
; Exception Handlers
;*******************************************************************************
; - NOTE -
; The IRQ and SWI handlers are the only managed exception.
UndefinedHandler
b UndefinedHandler
PrefetchAbortHandler
b PrefetchAbortHandler
DataAbortHandler
b DataAbortHandler
FIQHandler
b FIQHandler
DefaultISR
b DefaultISR
;*******************************************************************************
;* Function Name : IRQHandler
;* Description : This function called when IRQ exception is entered.
;* Input : none
;* Output : none
;*******************************************************************************
IRQHandler
portSAVE_CONTEXT ; Save the context of the current task.
LDR r0, = VectorAddress
LDR r0, [r0] ; Read the routine address
LDR r1, = VectorAddressDaisy
LDR r1, [r1]
MOV lr, pc
bx r0
LDR r0, = VectorAddress ; Write to the VectorAddress to clear the
STR r0, [r0] ; respective interrupt in the internal interrupt
LDR r1, = VectorAddressDaisy ; Write to the VectorAddressDaisy to clear the
STR r1,[r1] ; respective interrupt in the internal interrupt
portRESTORE_CONTEXT ; Restore the context of the selected task.
LTORG
END
;******************* (C) COPYRIGHT 2003 STMicroelectronics *****END OF FILE****