RTCAlarm_IRQ,RTC_IRQ,EXTI15_10_IRQ的关系

kinkun · 发表于 2015-11-12 03:41:37

[调试条件]
使用的STM32F103,FirmWare3.5

[参考手册的描述]
按照参考手册上解释的:
当以此函数进入到STOP模式时

WR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFE);
可以用以下方式唤醒STOP模式
RTC_Alarm的中断请求 -> EXTI_Line17中断请求 -> 关闭NVIC的EXTI15_10中断 -> 开启SCB的Send_Event_On_Pend(指NVIC接收到中断请求时,发出事件)

[实际调试时]
1. RTC_Alarm可以按照手册上描述的那样:通过EXTI_Line17的中断请求事件,唤醒STOP模式
2. 如果同时开启了RTCAlarm_IRQn(高优先级)和RTC_IRQn(低优先级)(但还是使用EXTI_Line17的中断请求事件来唤醒STOP模式),则系统被EXTI_Line17中断请求事件唤醒后,只会进入到RTC_IRQHandler(), 而不是进入到RTCAlarm_IRQHandler()
3. 如果开启RTC中断,并使系统全速运行,则三种中断请求(OverFlow,Alarm,Second)都会触发RTC中断,进入到RTC_IRQHandler()

[我的理解,但未实际调试来证实]
如果是用WFI进入到STOP模式: PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFI);
则要用这种方式唤醒STOP模式: RTC_Alarm的中断请求 -> EXTI_Line17中断请求 -> 开启NVIC的EXTI15_10中断
那么唤醒STOP模式后也只会进入到EXTI15_10_IRQHandler(), 而不是进入到RTCAlarm_IRQHandler()(我觉得这样会更符合情理)

[问题]
这样说来,岂不是不论在全速运行模式,还是用RTC_Alarm->EXTI_Line17中断请求事件唤醒STOP_Mode_WFE,还是用RTC_Alarm->EXTI_Line17中断唤醒STOP_Mode_WFI,都会使用RTC_IRQn,那么就没有必要使用RTCAlarm_IRQn,
那么RTCAlarm_IRQHandler()是干什么用的?怎么才能进入呢?

网上没有查到RTCAlarm_IRQn的资料,手册上也没查到,请求知道这部分内容的朋友能够不吝告知,
不胜感谢!!!

kinkun · 发表于 2015-11-12 03:41:38

今天翻资料,搞明白为什么了,分享一下

[背景]
STM32F10x微控制器参考手册中文版(翻译于英文版:2009年12月第10版)

[问题的解释]
参看手册9.1.2中断和异常向量表中的PVC,RTCAlarm,ETH_WKUP,USB_WKUP,在说明列是这么说的:连到EXTI的***中断.
再查看EXTI的所有中断源(手册9.2.5,图20)有:EXTI_0~19
其中 EXTI0~15映射到了IO口,
EXTI16连接到PVD的输出,
EXTI17连接到RTC闹钟事件,
EXTI18连接到USB唤醒事件,
EXTI19连接到ETH唤醒事件
再查看stm32f10x_firmware_v3.5中的startup_stm32f10x_hd.s
其中的这一段是向量表,其中关键的地方我用彩色标记出来了
__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 & ADC2
DCD USB_HP_CAN1_TX_IRQHandler ; USB High Priority or CAN1 TX
DCD USB_LP_CAN1_RX0_IRQHandler ; USB Low

riority 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
DCD TIM8_BRK_IRQHandler ; TIM8 Break
DCD TIM8_UP_IRQHandler ; TIM8 Update
DCD TIM8_TRG_COM_IRQHandler ; TIM8 Trigger and Commutation
DCD TIM8_CC_IRQHandler ; TIM8 Capture Compare
DCD ADC3_IRQHandler ; ADC3
DCD FSMC_IRQHandler ; FSMC
DCD SDIO_IRQHandler ; SDIO
DCD TIM5_IRQHandler ; TIM5
DCD SPI3_IRQHandler ; SPI3
DCD UART4_IRQHandler ; UART4
DCD UART5_IRQHandler ; UART5
DCD TIM6_IRQHandler ; TIM6
DCD TIM7_IRQHandler ; TIM7
DCD DMA2_Channel1_IRQHandler ; DMA2 Channel1
DCD DMA2_Channel2_IRQHandler ; DMA2 Channel2
DCD DMA2_Channel3_IRQHandler ; DMA2 Channel3
DCD DMA2_Channel4_5_IRQHandler ; DMA2 Channel4 & Channel5
__Vectors_End
看这段中蓝色和红色的行,就可得知,根本没有EXTI(16~19)_IRQHandler,取而代之的是:PVD_IRQHandler, RTCAlarm_IRQHandler USBWakeUp_IRQHandler (高密度型STM32F10X没有ethernet,所以就没有对应的中断)

[结论]
所以我理解的PVD_IRQHandler, RTCAlarm_IRQHandler USBWakeUp_IRQHandler其实就是EXTI(16~19)_IRQHandler,
只不过他们不是普通的EXTI_IRQHandler,而是其输入线从内部连接在指定片上外设的EXTI,
因此他们的中断名称就被起了更加贴切的名字:PVD_IRQHandler, RTCAlarm_IRQHandler USBWakeUp_IRQHandler