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STM32F1xx以及其他CortexM3 M4内核的中断都差不多,都采用中断向量表的方式进行,中断产生时可以直接跳转到中断向量表中找到相应的中断。而且根据需要这个表可以放到非0的地方,一般都是放在程序最开始的地方。
代码如下 __Vectors DCD __initial_sp ; Top of Stack DCD Reset_Handler ; Reset Handler DCD NMI_Handler ; NMI Handler DCD HardFault_Handler ; Hard Fault Handler DCD MemManage_Handler ; MPU Fault Handler DCD BusFault_Handler ; Bus Fault Handler DCD UsageFault_Handler ; Usage Fault Handler DCD 0 ; Reserved DCD 0 ; Reserved DCD 0 ; Reserved DCD 0 ; Reserved DCD SVC_Handler ; SVCall Handler DCD DebugMon_Handler ; Debug Monitor Handler DCD 0 ; Reserved DCD PendSV_Handler ; PendSV Handler DCD SysTick_Handler ; SysTick Handler ; External Interrupts DCD WWDG_IRQHandler ; Window Watchdog DCD PVD_IRQHandler ; PVD through EXTI Line detect DCD TAMPER_IRQHandler ; Tamper DCD RTC_IRQHandler ; RTC DCD FLASH_IRQHandler ; Flash DCD RCC_IRQHandler ; RCC DCD EXTI0_IRQHandler ; EXTI Line 0 DCD EXTI1_IRQHandler ; EXTI Line 1 DCD EXTI2_IRQHandler ; EXTI Line 2 DCD EXTI3_IRQHandler ; EXTI Line 3 DCD EXTI4_IRQHandler ; EXTI Line 4 DCD DMA1_Channel1_IRQHandler ; DMA1 Channel 1 DCD DMA1_Channel2_IRQHandler ; DMA1 Channel 2 DCD DMA1_Channel3_IRQHandler ; DMA1 Channel 3 DCD DMA1_Channel4_IRQHandler ; DMA1 Channel 4 DCD DMA1_Channel5_IRQHandler ; DMA1 Channel 5 DCD DMA1_Channel6_IRQHandler ; DMA1 Channel 6 DCD DMA1_Channel7_IRQHandler ; DMA1 Channel 7 DCD ADC1_2_IRQHandler ; ADC1_2 DCD USB_HP_CAN1_TX_IRQHandler ; USB High Priority or CAN1 TX DCD USB_LP_CAN1_RX0_IRQHandler ; USB Low Priority or CAN1 RX0 DCD CAN1_RX1_IRQHandler ; CAN1 RX1 DCD CAN1_SCE_IRQHandler ; CAN1 SCE DCD EXTI9_5_IRQHandler ; EXTI Line 9..5 DCD TIM1_BRK_IRQHandler ; TIM1 Break DCD TIM1_UP_IRQHandler ; TIM1 Update DCD TIM1_TRG_COM_IRQHandler ; TIM1 Trigger and Commutation DCD TIM1_CC_IRQHandler ; TIM1 Capture Compare DCD TIM2_IRQHandler ; TIM2 DCD TIM3_IRQHandler ; TIM3 DCD TIM4_IRQHandler ; TIM4 DCD I2C1_EV_IRQHandler ; I2C1 Event DCD I2C1_ER_IRQHandler ; I2C1 Error DCD I2C2_EV_IRQHandler ; I2C2 Event DCD I2C2_ER_IRQHandler ; I2C2 Error DCD SPI1_IRQHandler ; SPI1 DCD SPI2_IRQHandler ; SPI2 DCD USART1_IRQHandler ; USART1 DCD USART2_IRQHandler ; USART2 DCD USART3_IRQHandler ; USART3 DCD EXTI15_10_IRQHandler ; EXTI Line 15..10 DCD RTCAlarm_IRQHandler ; RTC Alarm through EXTI Line DCD USBWakeUp_IRQHandler ; USB Wakeup from suspend __Vectors_End AMR9的中断与其不同,ARM9只有一个中断入口,也就是中断来了以后都从这个入口进来,然后判断是什么中断,再进行相应的处理。代码如下(代码为RTT驱动里的) IRQ_Handler PROC STMFD SP!, {R0-R12,LR} BL rt_interrupt_enter BL rt_hw_trap_irq BL rt_interrupt_leave LDR R0, =rt_thread_switch_interrupt_flag LDR R1, [R0] CMP R1, #1 BEQ rt_hw_context_switch_interrupt_do LDMFD SP!, {R0-R12,LR} SUBS PC, LR, #4 ENDP 其中rt_hw_trap_irq(其他的为上下文切换的汇编,详情见RTT)就是中断处理函数的入口 void rt_hw_trap_irq() { rt_isr_handler_t isr_func; rt_uint32_t irq; void *param; /* get irq number */ irq = rt_hw_interrupt_get_active(INT_IRQ); /* get interrupt service routine */ isr_func = irq_desc[irq].handler; param = irq_desc[irq].param; /* turn to interrupt service routine */ isr_func(irq, param); rt_hw_interrupt_ack(INT_IRQ, irq); #ifdef RT_USING_INTERRUPT_INFO irq_desc[irq].counter ++; #endif } 在这里再进行相应的处理。 |
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