定时器代码不能进入中断

1542 韦东山定时器中断

问答对人有帮助，内容完整，我也想知道答案 0 //makefile src :=head.o init.o interrupt.o main.o time.bin:$(src) ARM-linux-ld -Ttime.lds -o time_elf $^ arm-linux-objcopy -O binary -S time_elf $@ arm-linux-objdump -D -m arm time_elf > time.dis %.o:%.s arm-linux-gcc -c -Wall -O -o $@ $< %.o:%.c arm-linux-gcc -c -Wall -O -o $@ $< clean: rm -rf .o .bin time_elf time.dis //s3c24xx.h /* WOTCH DOG register / #define WTCON ((volatile unsigned long )0x53000000) / SDRAM regisers / #define MEM_CTL_BASE 0x48000000 #define SDRAM_BASE 0x30000000 / NAND Flash registers / #define NFCONF ((volatile unsigned int )0x4e000000) #define NFCMD ((volatile unsigned char )0x4e000004) #define NFADDR ((volatile unsigned char )0x4e000008) #define NFDATA ((volatile unsigned char )0x4e00000c) #define NFSTAT ((volatile unsigned char )0x4e000010) /GPIO registers/ #define GPBCON ((volatile unsigned long )0x56000010) #define GPBDAT ((volatile unsigned long )0x56000014) #define GPFCON ((volatile unsigned long )0x56000050) #define GPFDAT ((volatile unsigned long )0x56000054) #define GPFUP ((volatile unsigned long )0x56000058) #define GPGCON ((volatile unsigned long )0x56000060) #define GPGDAT ((volatile unsigned long )0x56000064) #define GPGUP ((volatile unsigned long )0x56000068) #define GPHCON ((volatile unsigned long )0x56000070) #define GPHDAT ((volatile unsigned long )0x56000074) #define GPHUP ((volatile unsigned long )0x56000078) /UART registers/ #define ULCON0 ((volatile unsigned long )0x50000000) #define UCON0 ((volatile unsigned long )0x50000004) #define UFCON0 ((volatile unsigned long )0x50000008) #define UMCON0 ((volatile unsigned long )0x5000000c) #define UTRSTAT0 ((volatile unsigned long )0x50000010) #define UTXH0 ((volatile unsigned char )0x50000020) #define URXH0 ((volatile unsigned char )0x50000024) #define UBRDIV0 ((volatile unsigned long )0x50000028) /interrupt registes/ #define SRCPND ((volatile unsigned long )0x4A000000) #define INTMOD ((volatile unsigned long )0x4A000004) #define INTMSK ((volatile unsigned long )0x4A000008) #define PRIORITY ((volatile unsigned long )0x4A00000c) #define INTPND ((volatile unsigned long )0x4A000010) #define INTOFFSET ((volatile unsigned long )0x4A000014) #define SUBSRCPND ((volatile unsigned long )0x4A000018) #define INTSUBMSK ((volatile unsigned long )0x4A00001c) /external interrupt registers/ #define EINTMASK ((volatile unsigned long )0x560000a4) #define EINTPEND ((volatile unsigned long )0x560000a8) /clock registers/ #define LOCKTIME ((volatile unsigned long )0x4c000000) #define MPLLCON ((volatile unsigned long )0x4c000004) #define UPLLCON ((volatile unsigned long )0x4c000008) #define CLKCON ((volatile unsigned long )0x4c00000C) #define CLKSLOW ((volatile unsigned long )0x4c000010) #define CLKDIVN ((volatile unsigned long )0x4c000014) #define CAMDIVN ((volatile unsigned long )0x4c000018) /PWM &TIME registers/ #define TCFG0 ((volatile unsigned long )0x51000000) #define TCFG1 ((volatile unsigned long )0x51000004) #define TCON ((volatile unsigned long )0x51000008) #define TCNTB0 ((volatile unsigned long )0x5100000c) #define TCMPB0 ((volatile unsigned long )0x51000010) #define TCNTO0 ((volatile unsigned long )0x51000014) //head.s .text .global _start _start: b reset handleundef: b handleundef handleswi: b handleswi handleprefetchabort: b handleprefetchabort handledataabort: b handledataabort handlenotused: b handlenotused b handle_irq handlefiq: b handlefiq reset: ldr sp,=4096 bl disable_watchdog bl clock_init bl memsetup bl copy_steppingstone_to_sdram ldr pc,=on_sdram on_sdram: msr cpsr_c,#0xd2 ldr sp,=4096 msr cpsr_c,#0xdf ldr sp,=0x34000000 bl init_led bl time0_init bl init_irq msr cpsr_c,#0x5f ldr lr,=halt_loop ldr pc,=main halt_loop: b halt_loop handle_irq: sub lr,lr,#4 stmdb sp!,{r0-r12,lr} ldr lr,=int_return ldr pc,=time0_handle int_return: ldmia sp!,{r0-r12,pc}^ //init.c #include"s3c24xx.h" #define GPF4_OUT (1<<(24)) #define GPF5_OUT (1<<(25)) #define GPF6_OUT (1<<(26)) #define GPF4_MASK (3<<(24)) #define GPF5_MASK (3<<(25)) #define GPF6_MASK (3<<(26)) void disable_watchdog(void) { WTCON=0; } void init_led(void) { GPFCON&=(~(GPF4_MASK & GPF5_MASK & GPF6_MASK)); GPFCON\|=GPF4_OUT \| GPF5_OUT \|GPF6_OUT; } void clock_init(void) { CLKDIVN=0x03; //fclk:hclk:pclk prescaler 1:2:3 __asm__( "mrc p15,0,r1,c1,c0,0n" "orr r1,r1,#0xc0000000n" "mcr p15,0,r1,c1,c0,0n" ); MPLLCON=(0x5c<<12)\|(0x01<<4)\|(0x02); //flck= mpll=200mhz hclk=100mhz pclk=50mhz } void memsetup(void) { volatile unsigned P=(volatile unsigned long )0x48000000; P[0] = 0x22011110; //BWSCON P[1] = 0x00000700; //BANKCON0 P[2] = 0x00000700; //BANKCON1 P[3] = 0x00000700; //BANKCON2 P[4] = 0x00000700; //BANKCON3 P[5] = 0x00000700; //BANKCON4 P[6] = 0x00000700; //BANKCON5 P[7] = 0x00018005; //BANKCON6 P[8] = 0x00018005; //BANKCON7 P[9] = 0x008C04F4; //REFRESH P[10]= 0x000000b1; //BANKSIZE P[11]= 0x00000030; //MRSRB6 P[12]= 0x00000030; //MRSRB7 } void copy_steppingstone_to_sdram(void) { unsigned int src= (unsigned int )0; unsigned int dest=(unsigned int )0x30000000; while(src<(unsigned int )4096) { src=dest; //could modefy src++; dest++; } } void time0_init(void) { TCFG0=99; //prescaler=99 TCFG1=0x3; //divider =16 frequency=pclk/(99+1)/16=312500 TCNTB0=15625; //interrupt=0.5s TCON\|=(1<<1); TCON=0x09; } void init_irq(void) { INTMSK &=(~(1<<10)); } //interrupt.c #include "s3c24xx.h" void time0_handle(void) { if(INTOFFSET==10) GPFDAT=GPFDAT&(~(7<<4)); SRCPND=1< INTPND=1<<10; } //time.lds SECTIONS { . = 0x30000000; .text : { (.text) } .rodata ALIGN(4): { (.rodata) } .data ALIGN(4) : { (.data) } .bss ALIGN(4) : { (.BSS) *(COMMON) } } //main.c void main(void) { while(1); } 0
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