?? app_isr.asm
字號:
;********************************************************************************************************
; APPLICATION SPECIFIC ISRs
;
; (c) Copyright 2005, Micrium, Weston, FL
; All Rights Reserved
;
; File : APP_ISR.S90
; By : Jean J. Labrosse
;********************************************************************************************************
NAME app_isr
RSEG CSTACK:DATA:NOROOT(0)
RSEG RSTACK:DATA:NOROOT(0)
//#include "os_cpu_a.s90"
BIT00 = 0x01
BIT01 = 0x02
BIT02 = 0x04
BIT03 = 0x08
BIT04 = 0x10
BIT05 = 0x20
BIT06 = 0x40
BIT07 = 0x80
;********************************************************************************************************
; I/O PORT ADDRESSES
;********************************************************************************************************
SREG = 0x3F
SPH = 0x3E
SPL = 0x3D
RAMPZ = 0x3B
;********************************************************************************************************
; MACROS
;********************************************************************************************************
PUSH_ALL MACRO ; Save all registers
ST -Y,R0
ST -Y,R1
ST -Y,R2
ST -Y,R3
ST -Y,R4
ST -Y,R5
ST -Y,R6
ST -Y,R7
ST -Y,R8
ST -Y,R9
ST -Y,R10
ST -Y,R11
ST -Y,R12
ST -Y,R13
ST -Y,R14
ST -Y,R15
ST -Y,R16
ST -Y,R17
ST -Y,R18
ST -Y,R19
ST -Y,R20
ST -Y,R21
ST -Y,R22
ST -Y,R23
ST -Y,R24
ST -Y,R25
ST -Y,R26
ST -Y,R27
ST -Y,R30
ST -Y,R31
IN R16,RAMPZ
ST -Y,R16
ENDM
POP_ALL MACRO ; Restore all registers
LD R16,Y+
OUT RAMPZ,R16
LD R31,Y+
LD R30,Y+
LD R27,Y+
LD R26,Y+
LD R25,Y+
LD R24,Y+
LD R23,Y+
LD R22,Y+
LD R21,Y+
LD R20,Y+
LD R19,Y+
LD R18,Y+
LD R17,Y+
LD R16,Y+
LD R15,Y+
LD R14,Y+
LD R13,Y+
LD R12,Y+
LD R11,Y+
LD R10,Y+
LD R9,Y+
LD R8,Y+
LD R7,Y+
LD R6,Y+
LD R5,Y+
LD R4,Y+
LD R3,Y+
LD R2,Y+
LD R1,Y+
LD R0,Y+
ENDM
PUSH_SP MACRO ; Save stack pointer
IN R16,SPH
ST -Y,R16
IN R16,SPL
ST -Y,R16
ENDM
POP_SP MACRO ; Restore stack pointer
LD R16,Y+
OUT SPL,R16
LD R16,Y+
OUT SPH,R16
ENDM
PUSH_SREG MACRO ; Save status register
IN R16,SREG
ST -Y,R16
ENDM
POP_SREG MACRO ; Restore status registers
LD R16,Y+
OUT SREG,R16
ENDM
PUSH_SREG_INT MACRO ; Save status register with interrupts ENABLED
IN R16,SREG
SBR R16,BIT07
ST -Y,R16
ENDM
POP_SREG_INT MACRO ; Restore status registers but DISABLE interrupts
LD R16,Y+
CBR R16,BIT07
OUT SREG,R16
ENDM
;********************************************************************************************************
; EXTERNAL DECLARATIONS
;********************************************************************************************************
EXTERN OSIntExit
EXTERN OSIntNesting
EXTERN OSTCBCur
EXTERN BSP_TickISR_Handler
;********************************************************************************************************
; PUBLIC DECLARATIONS
;********************************************************************************************************
PUBLIC BSP_TickISR
;/*$PAGE*/
;********************************************************************************************************
; SYSTEM TICK ISR
;
; Description : This function is the Tick ISR.
;
; The following C-like pseudo-code describe the operation being performed in the code below.
;
; Save all registers on the current task's stack:
; Use the PUSH_ALL macro
; Get the SREG, set Bit #7 and save onto the task's stack using -Y addressing
; Use the PUSH_SP macro to save the task's hardware stack pointer onto the current task's stack
; OSIntNesting++;
; if (OSIntNesting == 1) {
; OSTCBCur->OSTCBStkPtr = SP
; }
; Clear the interrupt; Not needed for the timer we used.
; OSTimeTick(); Notify uC/OS-II that a tick has occured
; OSIntExit(); Notify uC/OS-II about end of ISR
; Restore all registers that were save on the current task's stack:
; Use the POP_SP macro to restore the task's hardware stack pointer
; Use the POP_SREG macro to restore the SREG register
; Use the POP_ALL macro to restore the remaining registers
; Return from interrupt
;********************************************************************************************************
RSEG CODE:CODE:NOROOT(1)
BSP_TickISR:
PUSH_ALL ; Save all registers and status register
IN R16,SREG ; Save the SREG but with interrupts enabled
SBR R16,BIT07
ST -Y,R16
PUSH_SP ; Save the task's hardware stack pointer onto task's stack
LDS R16,OSIntNesting ; Notify uC/OS-II of ISR
INC R16 ;
STS OSIntNesting,R16 ;
CPI R16,1 ; if (OSIntNesting == 1) {
BRNE BSP_TickISR_1
LDS R30,OSTCBCur ; OSTCBCur->OSTCBStkPtr = Y
LDS R31,OSTCBCur+1
ST Z+,R28
ST Z+,R29 ; }
BSP_TickISR_1:
CALL BSP_TickISR_Handler ; Call tick ISR Handler written in C
CALL OSIntExit ; Notify uC/OS-II about end of ISR
POP_SP ; Restore the hardware stack pointer from task's stack
POP_SREG_INT
POP_ALL ; Restore all registers
RETI
END
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