startup_LPC17xx.s

;/**************************************************************************//**
; * @file     startup_LPC17xx.s
; * @brief    CMSIS Cortex-M3 Core Device Startup File for
; *           NXP LPC17xx Device Series
; * @version  V1.10
; * @date     06. April 2011
; *
; * @note
; * Copyright (C) 2009-2011 ARM Limited. All rights reserved.
; *
; * @par
; * ARM Limited (ARM) is supplying this software for use with Cortex-M
; * processor based microcontrollers.  This file can be freely distributed
; * within development tools that are supporting such ARM based processors.
; *
; * @par
; * THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED
; * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
; * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
; * ARM SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
; * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
; *
; ******************************************************************************/

; *------- <<< Use Configuration Wizard in Context Menu >>> ------------------

; <h> Stack Configuration
;   <o> Stack Size (in Bytes) <0x0-0xFFFFFFFF:8>
; </h>

Stack_Size      EQU     0x00000200

                AREA    STACK, NOINIT, READWRITE, ALIGN=3
Stack_Mem       SPACE   Stack_Size
__initial_sp


; <h> Heap Configuration
;   <o>  Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>
; </h>

Heap_Size       EQU     0x00000000

                AREA    HEAP, NOINIT, READWRITE, ALIGN=3
__heap_base
Heap_Mem        SPACE   Heap_Size
__heap_limit


                PRESERVE8
                THUMB


; Vector Table Mapped to Address 0 at Reset

                AREA    RESET, DATA, READONLY
                EXPORT  __Vectors

__Vectors       DCD     __initial_sp              ; Top of Stack
                DCD     Reset_Handler             ; Reset Handler
                DCD     NMI_Handler               ; NMI Handler
                DCD     HardFault_Handler         ; Hard Fault Handler
                DCD     MemManage_Handler         ; MPU Fault Handler
                DCD     BusFault_Handler          ; Bus Fault Handler
                DCD     UsageFault_Handler        ; Usage Fault Handler
                DCD     0                         ; Reserved
                DCD     0                         ; Reserved
                DCD     0                         ; Reserved
                DCD     0                         ; Reserved
                DCD     SVC_Handler               ; SVCall Handler
                DCD     DebugMon_Handler          ; Debug Monitor Handler
                DCD     0                         ; Reserved
                DCD     PendSV_Handler            ; PendSV Handler
                DCD     SysTick_Handler           ; SysTick Handler

                ; External Interrupts
                DCD     WDT_IRQHandler            ; 16: Watchdog Timer
                DCD     TIMER0_IRQHandler         ; 17: Timer0
                DCD     TIMER1_IRQHandler         ; 18: Timer1
                DCD     TIMER2_IRQHandler         ; 19: Timer2
                DCD     TIMER3_IRQHandler         ; 20: Timer3
                DCD     UART0_IRQHandler          ; 21: UART0
                DCD     UART1_IRQHandler          ; 22: UART1
                DCD     UART2_IRQHandler          ; 23: UART2
                DCD     UART3_IRQHandler          ; 24: UART3
                DCD     PWM1_IRQHandler           ; 25: PWM1
                DCD     I2C0_IRQHandler           ; 26: I2C0
                DCD     I2C1_IRQHandler           ; 27: I2C1
                DCD     I2C2_IRQHandler           ; 28: I2C2
                DCD     SPI_IRQHandler            ; 29: SPI
                DCD     SSP0_IRQHandler           ; 30: SSP0
                DCD     SSP1_IRQHandler           ; 31: SSP1
                DCD     PLL0_IRQHandler           ; 32: PLL0 Lock (Main PLL)
                DCD     RTC_IRQHandler            ; 33: Real Time Clock
                DCD     EINT0_IRQHandler          ; 34: External Interrupt 0
                DCD     EINT1_IRQHandler          ; 35: External Interrupt 1
                DCD     EINT2_IRQHandler          ; 36: External Interrupt 2
                DCD     EINT3_IRQHandler          ; 37: External Interrupt 3
                DCD     ADC_IRQHandler            ; 38: A/D Converter
                DCD     BOD_IRQHandler            ; 39: Brown-Out Detect
                DCD     USB_IRQHandler            ; 40: USB
                DCD     CAN_IRQHandler            ; 41: CAN
                DCD     DMA_IRQHandler            ; 42: General Purpose DMA
                DCD     I2S_IRQHandler            ; 43: I2S
                DCD     ENET_IRQHandler           ; 44: Ethernet
                DCD     RIT_IRQHandler            ; 45: Repetitive Interrupt Timer
                DCD     MCPWM_IRQHandler          ; 46: Motor Control PWM
                DCD     QEI_IRQHandler            ; 47: Quadrature Encoder Interface
                DCD     PLL1_IRQHandler           ; 48: PLL1 Lock (USB PLL)
                DCD     USBActivity_IRQHandler    ; 49: USB Activity interrupt to wakeup
                DCD     CANActivity_IRQHandler    ; 50: CAN Activity interrupt to wakeup


                IF      :LNOT::DEF:NO_CRP
                AREA    |.ARM.__at_0x02FC|, CODE, READONLY
CRP_Key         DCD     0xFFFFFFFF
                ENDIF


                AREA    |.text|, CODE, READONLY

				AREA matrixDeclaration, DATA, READWRITE
matrix 			SPACE 2000
				AREA arrayInitialization, DATA, READONLY
array 			DCD 4, 30, 120, 340, 780

	
                AREA    |.text|, CODE, READONLY

; Reset Handler

Reset_Handler   	PROC
					EXPORT  Reset_Handler             [WEAK]
					
					; Specification 1
					LDR r0, =matrix
					LDR r1, =array
					MOV r2, #5 			; number of values in the array
					BL initializeMatrix
					
					; Specification 2
					LDR r0, =matrix
					MOV r1, #5
					BL computeDifferences 
					
					; Specification 3
					LDR r0, =matrix
					MOV r1, #5
					MOV r2, #9 			; return value will be p(r2)
					BL getPolynomialValue 
				
stop 				B stop
					ENDP

initializeMatrix 	PROC		
					PUSH {r4, LR}
					MOV r4, #0			; index
					MOV r12, #4			; value for multiplication
					MUL r12, r12, r2 	; step 
loopInitialize
					LDR r3, [r1], #4	; load array
					STR r3, [r0, r4]	; store in matrix
					ADD r4, r4, r12		; increment index
					SUB r2, r2, #1		; next row
					CMP r2, #0
					BNE loopInitialize
					POP {r4, PC}
					ENDP
					
computeDifferences 	PROC
					PUSH {r4, r5, r6, r7, r8, LR}
					MOV r7, r1
					MOV r2, #4			; value for multiplication
					MUL r2, r1, r2 		; step forward
					SUB r8, r2, #4		; step backward
outerLoop
					MOV r4, #0			; index
					MOV r5, #1			
innerLoop
					LDR r3, [r0, r4] 	;M[i][j]
					ADD r4, r4, r2
					MUL r6, r2, r5 
					LDR r12,[r0, r6] 	;M[i+1][j]
					SUB r6, r6, r8 		;index of M[i][j+1]					
					SUBS r3, r12, r3	;M[i+1][j] - M[i][j]
					BLVS checkOverflow
					STR r3, [r0, r6]	;store result
					ADD r6, r6, r8		;increment back to j
					ADD r5, r5, #1		
					CMP r5, r7
					BNE innerLoop					
					SUB r7, r7, #1
					ADD r0, r0, #4
					CMP r7, #1
					BNE outerLoop
					POP {r4, r5, r6, r7, r8, PC}
					ENDP
						
getPolynomialValue 	PROC
					PUSH {r4, r5, r6, r7, r8, LR}
					MOV r12, #4
					MUL r12, r1, r12 		; step
					SUB r4, r12, #4 		; index
					LDR r3, [r0, r4]
					ADD r4, r4, r12
					MOV r5, #1 			;initial row
					SUB r7, r1, #1
copyLoop
					STR r3, [r0, r4]
					ADD r4, r4, r12
					SUB r7, r7, #1
					CMP r7, #0	
					BNE copyLoop					
phaseThree
					ADD r5, r5, #1
					MOV r7, r1
					SUB r4, r12, #4
					MUL r4, r4, r5
polyLoop
					LDR r3, [r0, r4]
					ADD r4, r4, #4
					LDR r6, [r0, r4]
					SUB r4, r4, #4
					ADD r4, r4, r12
					ADDS r3, r6, r3
					BLVS checkOverflow
					STR r3, [r0, r4]
					SUB r7, r7, #1
					CMP r7, #1
					BNE polyLoop
					CMP r5, r1
					BNE phaseThree					
					SUB r2, r2, #1
					MUL r4, r12, r2
					LDR r2, [r0, r4]					
					POP {r4, r5, r6, r7, r8, PC}
					ENDP

checkOverflow		PROC
					PUSH {LR}
					ITE MI
					MOVMI r3, #0x80000000
					MOVPL r3, #0x7FFFFFFF
					POP	{PC}
					ENDP

; Dummy Exception Handlers (infinite loops which can be modified)

NMI_Handler     PROC
                EXPORT  NMI_Handler               [WEAK]
                B       .
                ENDP
HardFault_Handler\
                PROC
                EXPORT  HardFault_Handler         [WEAK]
                B       .
                ENDP
MemManage_Handler\
                PROC
                EXPORT  MemManage_Handler         [WEAK]
                B       .
                ENDP
BusFault_Handler\
                PROC
                EXPORT  BusFault_Handler          [WEAK]
                B       .
                ENDP
UsageFault_Handler\
                PROC
                EXPORT  UsageFault_Handler        [WEAK]
                B       .
                ENDP
SVC_Handler     PROC
                EXPORT  SVC_Handler               [WEAK]
                B       .
                ENDP
DebugMon_Handler\
                PROC
                EXPORT  DebugMon_Handler          [WEAK]
                B       .
                ENDP
PendSV_Handler  PROC
                EXPORT  PendSV_Handler            [WEAK]
                B       .
                ENDP
SysTick_Handler PROC
                EXPORT  SysTick_Handler           [WEAK]
                B       .
                ENDP

Default_Handler PROC

                EXPORT  WDT_IRQHandler            [WEAK]
                EXPORT  TIMER0_IRQHandler         [WEAK]
                EXPORT  TIMER1_IRQHandler         [WEAK]
                EXPORT  TIMER2_IRQHandler         [WEAK]
                EXPORT  TIMER3_IRQHandler         [WEAK]
                EXPORT  UART0_IRQHandler          [WEAK]
                EXPORT  UART1_IRQHandler          [WEAK]
                EXPORT  UART2_IRQHandler          [WEAK]
                EXPORT  UART3_IRQHandler          [WEAK]
                EXPORT  PWM1_IRQHandler           [WEAK]
                EXPORT  I2C0_IRQHandler           [WEAK]
                EXPORT  I2C1_IRQHandler           [WEAK]
                EXPORT  I2C2_IRQHandler           [WEAK]
                EXPORT  SPI_IRQHandler            [WEAK]
                EXPORT  SSP0_IRQHandler           [WEAK]
                EXPORT  SSP1_IRQHandler           [WEAK]
                EXPORT  PLL0_IRQHandler           [WEAK]
                EXPORT  RTC_IRQHandler            [WEAK]
                EXPORT  EINT0_IRQHandler          [WEAK]
                EXPORT  EINT1_IRQHandler          [WEAK]
                EXPORT  EINT2_IRQHandler          [WEAK]
                EXPORT  EINT3_IRQHandler          [WEAK]
                EXPORT  ADC_IRQHandler            [WEAK]
                EXPORT  BOD_IRQHandler            [WEAK]
                EXPORT  USB_IRQHandler            [WEAK]
                EXPORT  CAN_IRQHandler            [WEAK]
                EXPORT  DMA_IRQHandler            [WEAK]
                EXPORT  I2S_IRQHandler            [WEAK]
                EXPORT  ENET_IRQHandler           [WEAK]
                EXPORT  RIT_IRQHandler            [WEAK]
                EXPORT  MCPWM_IRQHandler          [WEAK]
                EXPORT  QEI_IRQHandler            [WEAK]
                EXPORT  PLL1_IRQHandler           [WEAK]
                EXPORT  USBActivity_IRQHandler    [WEAK]
                EXPORT  CANActivity_IRQHandler    [WEAK]

WDT_IRQHandler
TIMER0_IRQHandler
TIMER1_IRQHandler
TIMER2_IRQHandler
TIMER3_IRQHandler
UART0_IRQHandler
UART1_IRQHandler
UART2_IRQHandler
UART3_IRQHandler
PWM1_IRQHandler
I2C0_IRQHandler
I2C1_IRQHandler
I2C2_IRQHandler
SPI_IRQHandler
SSP0_IRQHandler
SSP1_IRQHandler
PLL0_IRQHandler
RTC_IRQHandler
EINT0_IRQHandler
EINT1_IRQHandler
EINT2_IRQHandler
EINT3_IRQHandler
ADC_IRQHandler
BOD_IRQHandler
USB_IRQHandler
CAN_IRQHandler
DMA_IRQHandler
I2S_IRQHandler
ENET_IRQHandler
RIT_IRQHandler
MCPWM_IRQHandler
QEI_IRQHandler
PLL1_IRQHandler
USBActivity_IRQHandler
CANActivity_IRQHandler

                B       .

                ENDP


                ALIGN


; 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