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
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