day62:ARMday9,I2c总线通信

作业：按键中断实现LED1、蜂鸣器、风扇

key_in.c:

#include "key_in.h" void gpio_init() { //RCC使能 //GPIOE RCC->MP_AHB4ENSETR |= (0x1<<4); //GPIOB RCC->MP_AHB4ENSETR |= (0x1<<1); //PE10、PB6、PE9输出模式 GPIOE->MODER &= ~(0x3<<20); GPIOE->MODER |= (0x1<<20); GPIOB->MODER &= ~(0x3<<12); GPIOB->MODER |= (0x1<<12); GPIOE->MODER &= ~(0x3<<18); GPIOE->MODER |= (0x1<<18); //推挽模式 GPIOE->OTYPER &= ~(0x1<<10); GPIOB->OTYPER &= ~(0x1<<6); GPIOE->OTYPER &= ~(0x1<<9); //速度设置为低速 GPIOE->OSPEEDR &= ~(0x3<<20); GPIOB->OSPEEDR &= ~(0x3<<12); GPIOE->OSPEEDR &= ~(0x3<<18); //设置为无上拉下拉电阻 GPIOE->PUPDR &= ~(0x3<<20); GPIOB->PUPDR &= ~(0x3<<12); GPIOE->PUPDR &= ~(0x3<<18); } void key_in_config() { //RCC使能GPIOF时钟 RCC->MP_AHB4ENSETR |= (0x1<<5); //设置PF9 PF7 PF8管脚为输入模式 GPIOF->MODER &= ~(0x3f<<14); //设置PF9 PF7 PF8发生EXTI事件 EXTI->EXTICR3 &= ~(0xff<<8); EXTI->EXTICR3 |= (0x05<<8); EXTI->EXTICR2 &= ~(0xff<<24); EXTI->EXTICR2 |= (0x05<<24); EXTI->EXTICR3 &= ~(0xff); EXTI->EXTICR3 |= (0x05); //设置EXTI中断触发模式为下降沿模式 EXTI->FTSR1 |= (0x7<<7); //设置EXTI事件触发为不屏蔽 EXTI->C1IMR1 |= (0x7<<7); //使能组0 GICD->CTRL |= 0x1; //中断使能，使其可以传到CPU GICD->ISENABLER[3] |= (0x1<<3); GICD->ISENABLER[3] |= (0x1<<1); GICD->ISENABLER[3] |= (0x1<<2); //设置中断优先级 GICD->IPRIORITYR[24] &= ~(0x1f<<27); GICD->IPRIORITYR[24] &= ~(0x1f<<11); GICD->IPRIORITYR[24] &= ~(0x1f<<19); //选择CPU处理中断 GICD->ITARGETSR[24] &= ~(0x3<<24); GICD->ITARGETSR[24] |= (0x1<<24); GICD->ITARGETSR[24] &= ~(0x3<<8); GICD->ITARGETSR[24] |= (0x1<<8); GICD->ITARGETSR[24] &= ~(0x3<<16); GICD->ITARGETSR[24] |= (0x1<<16); //使能CPU处理转发的中断 GICC->CTRL |= 0x1; //设置中断掩码 GICC->PMR &= ~(0x1f<<3); GICC->PMR |= (0x5<<3); }

do_irq.c:

#include "key_in.h" extern void printf(const char *fmt, ...); unsigned int i = 0; void do_irq(void) { int irqno; static int i1=0,i2=0,i3=0; irqno = GICC->IAR & 0x3ff; switch(irqno) { case 99: printf("KEY1 %d\n",irqno); i1++; //key1中断处理,LED1 if(i1%2==1) GPIOE->ODR |= (0x1<<10); else GPIOE->ODR &= ~(0x1<<10); //清除挂起中断标识位 GICD->ICPENDR[3] |= (0x1<<3); //清除事情挂起标识位 EXTI->FPR1 |= (0x1<<9); break; case 97: printf("KEY2 %d\n",irqno); i2++; //key2中断处理,蜂鸣器 if(i2%2==1) GPIOB->ODR |= (0x1<<6); else GPIOB->ODR &= ~(0x1<<6); //清除挂起中断标识位 GICD->ICPENDR[3] |= (0x1<<1); //清除事情挂起标识位 EXTI->FPR1 |= (0x1<<7); break; case 98: printf("KEY3 %d\n",irqno); i3++; //key3中断处理,风扇 if(i3%2==1) GPIOE->ODR |= (0x1<<9); else GPIOE->ODR &= ~(0x1<<9); //清除挂起中断标识位 GICD->ICPENDR[3] |= (0x1<<2); //清除事情挂起标识位 EXTI->FPR1 |= (0x1<<8); break; } //清除处理完的中断IAR到EOIR GICC->EOIR=irqno; }

key_in.h:

#ifndef __KEY_IN_H__ #define __KEY_IN_H__ #include "stm32mp1xx_rcc.h" #include "stm32mp1xx_gpio.h" #include "stm32mp1xx_exti.h" #include "stm32mp1xx_gic.h" void gpio_init(); void key_in_config(); #endif

main.c:

#include "key_in.h" int main() { gpio_init(); key_in_config(); while(1) { } return 0; }

现象: