ARM中斷函數定義

ARM的中斷函數是在startup code中定義的，在CODE區分配中斷向量表時，及將中斷函數定義出了

; 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 0 ; Reserved

DCD 0 ; Reserved

DCD 0 ; Reserved

DCD 0 ; Reserved

DCD 0 ; Reserved

DCD 0 ; Reserved

DCD 0 ; Reserved

DCD SVC_Handler ; SVCall Handler

DCD 0 ; Reserved

DCD 0 ; Reserved

DCD PendSV_Handler ; PendSV Handler

DCD SysTick_Handler ; SysTick Handler

; External Interrupts

DCD GPIO0_IRQHandler ; GPIO P0 Interrupt

DCD GPIO1_IRQHandler ; GPIO P1 Interrupt

DCD GPIO2_IRQHandler ; GPIO P2 Interrupt

DCD GPIO3_IRQHandler ; GPIO P3 Interrupt

DCD GPIO4_IRQHandler ; GPIO P4 Interrupt

DCD CP_IRQHandler ; Capture/PWM

DCD ADC_IRQHandler ; A/D Converter

DCD Reserved_IRQHandler ; Reserved

DCD Reserved_IRQHandler ; Reserved

DCD Reserved_IRQHandler ; Reserved

DCD Reserved_IRQHandler ; Reserved

DCD Reserved_IRQHandler ; Reserved

DCD Reserved_IRQHandler ; Reserved

DCD Reserved_IRQHandler ; Reserved

DCD Reserved_IRQHandler ; Reserved

DCD UART0_IRQHandler ; UART0

DCD UART1_IRQHandler ; UART1

DCD UART2_IRQHandler ; UART2

DCD UART3_IRQHandler ; UART3

DCD TIMER0_IRQHandler ; Timer0

DCD TIMER1_IRQHandler ; Timer1

DCD TIMER1_IRQHandler ; Timer1

DCD TIMER2_IRQHandler ; Timer2

DCD TIMER3_IRQHandler ; Timer3

DCD WDT_IRQHandler ; Watchdog timer

DCD I2C0_IRQHandler ; I2C0

DCD I2C1_IRQHandler ; I2C1

DCD SSP0_IRQHandler ; SSP0

DCD SSP1_IRQHandler ; SSP1

DCD TIMER01_IRQHandler ; Timer0 Timer1

DCD TIMER23_IRQHandler ; Timer2 Timer3

DCD Reserved_IRQHandler ; Reserved

DCD Reserved_IRQHandler ; Reserved

AREA |.text|, CODE, READONLY

不同芯片有各自的startup code，所以定義不同。

在startup code中定義的中斷函數都是[weak]屬性，如果編譯器在別的文件中發現相同的函數名，則在鏈接時用別處的地址進行鏈接。

所以只要在工程的具體位置，按startup code中定義的名稱直接完整該函數即可，不用在特別聲明和與中斷向量號聯系起來。

Default_Handler PROC

EXPORT GPIO0_IRQHandler [WEAK]

EXPORT GPIO1_IRQHandler [WEAK]

EXPORT GPIO2_IRQHandler [WEAK]

EXPORT GPIO3_IRQHandler [WEAK]

EXPORT GPIO4_IRQHandler [WEAK]

EXPORT CP_IRQHandler [WEAK]

EXPORT ADC_IRQHandler [WEAK]

EXPORT SSP0RXINT_IRQHandler [WEAK]

EXPORT SSP0TXINT_IRQHandler [WEAK]

EXPORT SSP0RORINT_IRQHandler [WEAK]

EXPORT SSP0RTINT_IRQHandler [WEAK]

EXPORT SSP1RXINT_IRQHandler [WEAK]

EXPORT SSP1TXINT_IRQHandler [WEAK]

EXPORT SSP1RORINT_IRQHandler [WEAK]

EXPORT SSP1RTINT_IRQHandler [WEAK]

EXPORT UART0_IRQHandler [WEAK]

EXPORT UART1_IRQHandler [WEAK]

EXPORT UART2_IRQHandler [WEAK]

EXPORT UART3_IRQHandler [WEAK]

EXPORT TIMER0_IRQHandler [WEAK]

EXPORT TIMER1_IRQHandler [WEAK]

EXPORT TIMER2_IRQHandler [WEAK]

EXPORT TIMER3_IRQHandler [WEAK]

EXPORT WDT_IRQHandler [WEAK]

EXPORT I2C0_IRQHandler [WEAK]

EXPORT I2C1_IRQHandler [WEAK]

EXPORT SSP0_IRQHandler [WEAK]

EXPORT SSP1_IRQHandler [WEAK]

EXPORT TIMER01_IRQHandler [WEAK]

EXPORT TIMER23_IRQHandler [WEAK]

在具體的.c文件中

/*---------------------------------------------------------------------------------------------------------*/

/* Interrupt Handler */

/* Interrupt Handler */

/*---------------------------------------------------------------------------------------------------------*/

void I2C0_IRQHandler(void)

{

uint32_t status;

status = I2C0->STAT;

switch (status)

{

/* Arbitration loss */

case 0x38:

if (I2CHandler[0].ArbitLossCallBackFn)

I2CHandler[0].ArbitLossCallBackFn(status);

break;

/* Bus error */

case 0x00:

if (I2CHandler[0].BusErrCallBackFn)

I2CHandler[0].BusErrCallBackFn(status);

break;

default:

if (I2CHandler[0].I2CCallBackFn)

I2CHandler[0].I2CCallBackFn(status);

break;

}

}