韦老板_mini2440_2_防不胜防之中断

首先我说下我的修改的地方：
1：在handle_irq处我觉得ldr lr, =int_return没有用，所以删掉
2：K1，K2，K3，K4，都处于REQ5中所以他们的优先级相等

复制代码 /* time：2011.3.24        editor：kissyyg        filename:main.c function:the key1,2,3,4 are set as interrupt mode,their priorites                   are same and they control led1,2,3,4 one by one */ int main() {     while(1)         ;     return 0; } /* time：2011.3.24        editor：kissyyg        filename:eint_handle.c function:the irq handle function */ #define INTOFFSET (*(volatile unsigned long*)0x4a000014)   #define INTPND    (*(volatile unsigned *)0x4a000010) #define SRCPND    (*(volatile unsigned *)0x4a000000) #define EINTPND  (*(volatile unsigned *)0x560000a8) #define GPBDAT *((volatile unsigned long*)0x56000014) #define EINTPND_8  (1<<8) #define EINTPND_11 (1<<11) #define EINTPND_13 (1<<13) #define EINTPND_14 (1<<14) #define led1_on     ~(1<<5) #define led2_on     ~(1<<6) #define led3_on     ~(1<<7) #define led4_on     ~(1<<8) void eint_handle() {     unsigned long oft = INTOFFSET;     unsigned long val;          if(oft==5)                            //int8_11 interrupt happend     {         GPBDAT = 0xffff;                //turn down all the led         val = EINTPND;                  if(val & EINTPND_8)            //if k1 is pressed turn on led1 only               GPBDAT &= led1_on;                      if(val & EINTPND_11)            //if k2 is pressed turn on led2 only             GPBDAT &= led2_on;                      if(val & EINTPND_13)            //if k3 is pressed turn on led3 only             GPBDAT &= led3_on;                                  if(val & EINTPND_14)            //if k4 is pressed turn on led4 only             GPBDAT &= led4_on;                              //clear the eintpend and  srcpend and intpend in order                  EINTPND = (1<<8) | (1<<11) | (1<<13) | (1<<14);         SRCPND  = 1<<oft;         INTPND  = 1<<oft;          }                } /* time：2011.3.24        editor：kissyyg        filename:disable_watch_dog.c function: close the watch dog */ void disable_watch_dog() {     __asm         {         MOV r0, #0x53000000         MOV r1, #0x0         STR r1, [r0]         } } ;time：2011.3.24        editor：kissyyg        filename:head.s ;function:init the irq vector and the start the operator                    IMPORT main          IMPORT init_led          IMPORT disable_watch_dog          IMPORT init_irq          IMPORT eint_handle          CODE32     AREA test,CODE,READONLY     ENTRY               B Reset HANDLE_UNDEFINE          B HANDLE_UNDEFINE      HANDLE_SWI          B HANDLE_SWI HANDLE_PREFETCH_ABORT          B HANDLE_PREFETCH_ABORT      HANDLE_DATA_ABORT          B HANDLE_DATA_ABORT      HANDLE_NOTUSED          B HANDLE_NOTUSED HANDLE_IRQ          B handle_irq     HANDLE_FIQ          B HANDLE_FIQ      Reset          LDR SP, =4096          BL disable_watch_dog          MSR CPSR_c, #0xd2          LDR SP, =3072          MSR CPSR_c, #0xdf          BL init_led          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, =eint_handle      INT_RETURN     LDMIA SP!, { R0-R12,PC }^          END /* time：2011.3.24        editor：kissyyg        filename:init_led.c function:init the led's io port as the output mode */ #define GPBCON *((volatile unsigned long*)0x56000010) #define GPB5_OUT (1<<(5*2)) #define GPB6_OUT (1<<(6*2)) #define GPB7_OUT (1<<(7*2)) #define GPB8_OUT (1<<(8*2)) void init_led() {     GPBCON = GPB5_OUT | GPB6_OUT | GPB7_OUT | GPB8_OUT;      } /* time：    2011.3.24        editor：kissyyg        filename:init_irq.c function: init the irq,k1,k2,k3,k4 are related to GPG0,GPG3,GPG5,GPG6           so as to EINT8EINT11,EINT13,EINT14,they are added to ARB1           conctroller which is binded to REQ1as they are in the same           team od REQ1,so their priority are same */ #define GPGCON   *((volatile unsigned long*)0x56000060) #define EINTMASK *((volatile unsigned long*)0x560000a4) #define INTMASK  *((volatile unsigned long*)0x4a000008) #define PRIORITY *((volatile unsigned long*)0x4a000008) #define GPG0_EINT (2<<(0*2)) #define GPG3_EINT (2<<(3*2)) #define GPG5_EINT (2<<(5*2)) #define GPG6_EINT (2<<(6*2)) #define EINT8_UNMASK  (~(1<<8)) #define EINT11_UNMASK (~(1<<11)) #define EINT13_UNMASK (~(1<<13)) #define EINT14_UNMASK (~(1<<14)) #define EINT_8TO23_UNMASK (~(1<<5)) void init_irq() {     // config the GPGCON and EINTMASK registers          GPGCON = GPG0_EINT | GPG3_EINT | GPG5_EINT | GPG6_EINT;     EINTMASK &= EINT8_UNMASK & EINT11_UNMASK & EINT13_UNMASK & EINT14_UNMASK;          // config INTMASK register          INTMASK &= EINT_8TO23_UNMASK;      }

好了，欢迎大家一起讨论，下篇 时钟和定时器