LPC2131进不了串口中断，高手帮忙看看

 AREA uart0_test, CODE, READONLY

ENTRY

PINSEL0 EQU 0xE002C000

VICIntSelect EQU 0xFFFFF00C 

VICIntEnable EQU 0xFFFFF010

VICVectAddr EQU 0xFFFFF030

VICVectAddr0 EQU 0xFFFFF100

VICVectCntl0 EQU 0xFFFFF200

U0RBR EQU 0xE000C000

U0THR EQU 0xE000C000

U0DLL EQU 0xE000C000

U0DLM EQU 0xE000C004

U0IER EQU 0xE000C004

U0IIR EQU 0xE000C008

U0FCR EQU 0xE000C008

U0LCR EQU 0xE000C00C

U0LSR EQU 0xE000C014

Vectors LDR PC, Reset_Addr 

LDR PC, Undef_Addr

LDR PC, SWI_Addr

LDR PC, PAbt_Addr

LDR PC, DAbt_Addr

NOP ; Reserved Vector 

LDR PC, IRQ_Addr

; LDR PC, [PC, #-0x0FF0] ; Vector from VicVectAddr

LDR PC, FIQ_Addr



Reset_Addr DCD Reset_Handler

Undef_Addr DCD Undef_Handler

SWI_Addr DCD SWI_Handler

PAbt_Addr DCD PAbt_Handler

DAbt_Addr DCD DAbt_Handler

DCD 0 ; Reserved Address 

IRQ_Addr DCD IRQ_Handler

FIQ_Addr DCD FIQ_Handler



Reset_Handler B start

Undef_Handler B Undef_Handler

SWI_Handler B SWI_Handler

PAbt_Handler B PAbt_Handler

DAbt_Handler B DAbt_Handler

IRQ_Handler B IRQ_Handler

FIQ_Handler B FIQ_Handler

start

LDR R0,=PINSEL0 ;设置P0.0和P0.1为UART0

LDR R1,[R0]

BIC R1,#0x0F

ORR R1,R1,#0x05

STR R1,[R0]

LDR R0,=U0LCR ;设置UART0工作模式，并使能访问除数锁存器

MOV R1,#0x83

STR R1,[R0]

LDR R0,=U0DLL ;设置UART0波特率

MOV R1,#0x01

STR R1,[R0]

LDR R0,=U0LCR ;禁止访问除数锁存器

MOV R1,#0x03

STR R1,[R0]

LDR R0,=U0IER ;允许UART0接收中断

MOV R1,#0x01

STR R1,[R0]

LDR R0,=U0FCR ;使能FIFO功能，并设置RX触发为8字节

MOV R1,#0x81

STR R1,[R0]

MRS R0,CPSR ;使能IRQ中断

BIC R0,#0x80

MSR CPSR_c,R0

LDR R0,=VICIntSelect

MOV R1,#0x00

STR R1,[R0]

LDR R0,=VICVectCntl0

MOV R1,#0x26

STR R1,[R0]

LDR R0,=VICVectAddr0

LDR R1,=IRQ_Handler

STR R1,[R0]

LDR R0,=VICIntEnable

MOV R1,#0x40

STR R1,[R0]

loop B loop

END