Stm32F407——跑马灯的实现(3)

太过爱你忘了你带给我的痛 2022-10-17 00:46 220阅读 0赞

**通用I/O端口功能函数的设计：**  
1、提供端口入口  
2、设置要配置的引脚  
3、设置引脚功能  
4.5、如为输出，设置数据驱动方式和速度  
6、如为输入，设置上下拉电阻

> main.c

#include "delay.h"
    #include "sys.h"
    #include "led.h"
    int main(void)
    { 
    	Stm32_Clock_Init(336,8,2,7);//系统时钟初始化
    	LED_Init();//LED灯初始化
    	while(1)
    	{ 
    		LED0 = 0; LED1 = 1; //led0亮led1灭
    		delay();
    		LED0 = 1; LED1 = 0; //led0灭led1亮
    		delay();
    	}
    }

> sys.c(函数内容的设计):

GPIO_Set(GPIOF,(1<<9)|(1<<10),1,0,1,1);//设置GPIOF的第9和10引脚

> 通用I/O端口功能函数的设计

void GPIO_Set(GPIO_TypeDef *GPIOx,u16 pin,u8 mode,u8 otype,u8 ospeed,u8 pupd)
    { 
    	u8 pos=0;
    	for(pos=0;pos<16;pos++)//1
    	{ 
    		if((1<<pos)&pin)//2
    		{ 
    			GPIOx->MODER &= ~(3<<(pos*2));//3
    			GPIOx->MODER |= (mode<<(pos*2));
    			if((GPIOx->MODER == 1)||(GPIOx->MODER == 2))//4、5
    			{ 
    				GPIOx->OTYPER  &= ~(1<<pos);
    				GPIOx->OTYPER  |= (otype<<pos);
    				GPIOx->OSPEEDR &=~(3<<(pos*2));
    				GPIOx->OSPEEDR |= (ospeed<<(pos*2));
    			}
    			GPIOx->PUPDR &= ~(3<<(pos*2));//6
    			GPIOx->PUPDR |= (pupd<<(pos*2));
    		}
    	}
    }

> led.c

#include "stm32f407.h"
    #include "led.h"
    #include "typedef.h"
    #include "sys.h"
    void LED_Init(void)
    { 
    	RCC_AHB1ENR |= 1<<5;        //使能GPIOF的时钟
    	GPIO_Set(GPIOF,(1<<9)|(1<<10),1,0,1,1);//设置GPIOF的第9和10引脚
    	LED0 = 1;
    	LED1 = 1;
    }

> led.h

#ifndef _LED_H_
    #define _LED_H_
    	#include "stm32f407.h"
    	#define LED0 PFout(9)
    	#define LED1 PFout(10)
    	void LED_Init(void);
    #endif

> 定义引脚地址：

#define GPIOF_ODR 0x40021414
    #define ALIASADDR(bitbandaddr,bitn) (*(volatile unsigned int*)((bitbandaddr&0xf0000000)+0x2000000+((bitbandaddr&0xfffff)<<5)+(bitn<<2)))
    #define PFout(n) ALIASADDR(GPIOF_ODR, n)
    #define GPIOF (GPIO_TypeDef*)0x40021400