每一个中断都有一个专门的寄存器(Interrupt Priority Registers)来描述该中断的抢占式优先级和响应式优先级。在这个寄存器中STM32使用了4个二进制位来描述优先级。4位的中断优先级可以分成2组,从高位看,前面定义的是抢占式优先级,后面是响应优先级。按照这种分组,4位一共可以分成5组,分别为:...
24 EXTI->RTSR &= ~EXTI_InitStruct->EXTI_Line; 25 EXTI->FTSR &= ~EXTI_InitStruct->EXTI_Line; 26 27 /* Select the trigger for the selected external interrupts */ 28 if (EXTI_InitStruct->EXTI_Trigger == EXTI_Trigger_Rising_Falling) 29 { 30 /* Rising Falling edge */ 31 EXTI->RT...
对于开关对应管脚PB5,设置其触发方式为上升沿触发 External Interrupt Mode with Rising edge trigger detection上升沿 External Interrupt Mode with Falling edge trigger detection下降沿 External Interrupt Mode with Rising/Falling edge trigger detection上升沿和下降沿 User Label处设置名字为 B5_EXTI 使能对应的外部...
27 /* Select the trigger for the selected external interrupts */ 28 if (EXTI_InitStruct->EXTI_Trigger == EXTI_Trigger_Rising_Falling) 29 { 30 /* Rising Falling edge */ 31 EXTI->RTSR |= EXTI_InitStruct->EXTI_Line; 32 EXTI->FTSR |= EXTI_InitStruct->EXTI_Line; 33 } 34 else 35 ...
1 void EXTI_Configuration(void) 2 { 3 EXTI_InitTypeDef EXTI_InitStructure; 4 /*PD11输入*/ 5 EXTI_InitStructure.EXTI_Line = EXTI_Line11; 6 EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; 7 EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; 8 EXTI_InitStructure.EXTI_LineCmd = ENABLE...
Pin:PC13Mode:Interrupt; Rising edge Trigger detectionPull:Floating 在gpio.c : /*连接引脚与中断线(EXTICRn)*/LL_GPIO_AF_SetEXTISource(LL_GPIO_AF_EXTI_PORTC, LL_GPIO_AF_EXTI_LINE13);/*配置中断线*/EXTI_InitStruct.Line_0_31 = LL_EXTI_LINE_13; //配置触发源的连接 ...
IMR:中断屏蔽寄存器Interrupt Mask Register 32位寄存器前19位有效 EMR: 事件屏蔽寄存器Event mask register 32位寄存器前19位有效 RTST: 上升沿触发选择寄存器Rising edge trigger select register FTSR:下降沿触发选择寄存器Falling edge trigger select register ...
Rising Falling edge configuration*/24EXTI->RTSR &= ~EXTI_InitStruct->EXTI_Line;25EXTI->FTSR &= ~EXTI_InitStruct->EXTI_Line;2627/*Select the trigger for the selected external interrupts*/28if(EXTI_InitStruct->EXTI_Trigger ==EXTI_Trigger_Rising_Falling)29{30/*Rising Falling edge*/31EXTI-...
开启下降沿触发中断:即在按下按键时电平由高变为低时触发,则在GPIO mode中选择External Interrupt Mode with Falling edge trigger detection 开启上升沿触发中断:即在按下按键后松开时电平由低变为高时触发,则在GPIO mode中选择External Interrupt Mode with Rising edge trigger detection ...
IP全称是:Interrupt Priority Registers,是一个中断优先级控制寄存器组。这个寄存器组相当重要!STM32MP157的中断分组与这个寄存器组密切相关。 IP寄存器组由240个8bit的寄存器组成,每个寄存器对应一个中断优先级,每个可屏蔽中断占用8bit,这样总共可以表示240个可屏蔽中断。 实际上STM32MP157只用到了其中的150个。IP[149...