如題
先在闆子圖上找到引腳
beep引腳PF8,LED0 PF9
我們編寫程式使用的官方提供的庫函數,我們需要完成beep.c,led.c,key.c的編寫,這些用于按鍵,led燈,以及beep的初始化,以及位帶映射的宏定義
主函數
#include "stm32f4xx.h"
#include "led.h"
#include "delay.h"
#include "key.h"
#include "sys.h"
#include "beep.h"
int main()
{
led_init();//
key_init();//
beep_init();
while(1)
{
if(PAin(0) == 0)
{
PFout(9) ^= 1;
PFout(8) ^= 1;
}
delay(5000);
}
}
主函數解釋:先對ledkey,beep進行初始化,然後進入循環(我們需要持續觀察到現象,是以需要死循環),然後判斷按鍵是否按下過,未按下則執行 亦或1運算,運算後燈亮蜂鳴,
led.c
#include "led.h"
void led_init(void)
{
//³õʼ»¯GPIOFµÄ9ºÅÒý½ÅΪÍÆÍìÊä³ö£¬¸ßËÙÎÞÉÏÏÂÀµÄģʽ
GPIO_InitTypeDef LED;
//¿ªÆôGPIOF£¬GPIOEµÄʱÖÓ£¬
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE | RCC_AHB1Periph_GPIOF,ENABLE);
LED.GPIO_Mode = GPIO_Mode_OUT;//ÅäÖÃΪÊä³öģʽ
LED.GPIO_OType = GPIO_OType_PP;//ÅäÖÃΪÍÆÍìÊä³ö
LED.GPIO_Pin = GPIO_Pin_9 |GPIO_Pin_10 ;//Ñ¡ÖÐ9ºÅºÍ10ºÅÒý½Å
LED.GPIO_PuPd = GPIO_PuPd_NOPULL;//²»ÒªÉÏÏÂÀģʽ
LED.GPIO_Speed = GPIO_High_Speed;//¸ßËÙ
GPIO_Init(GPIOF,&LED);
LED.GPIO_Pin = GPIO_Pin_13 |GPIO_Pin_14 ;//Ñ¡ÖÐ13ºÅºÍ14ºÅÒý½Å
GPIO_Init(GPIOE,&LED);
//°ÑLEDµÆ¶¼¹Ø±Õ
GPIO_SetBits(GPIOF,GPIO_Pin_9 | GPIO_Pin_10);
GPIO_SetBits(GPIOE,GPIO_Pin_13| GPIO_Pin_14);
}
注釋看不清楚,是因為我在keil5中編寫的代碼,你将代碼複制到keil5中的環境中去就可以了
led.h
#ifndef _LED_H_
#define _LED_H_
#include "stm32f4xx.h"
void led_init(void);
#endif
key.c
#include "key.h"
void key_init(void)
{
GPIO_InitTypeDef KEY;
//¿ªÆôGPIOAµÄʱÖÓ£¬
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);
//³õʼ»¯°´¼üPA0
KEY.GPIO_Mode = GPIO_Mode_IN;//ÅäÖÃΪÊäÈëģʽ
KEY.GPIO_Pin = GPIO_Pin_0 ;//Ñ¡ÖÐ0ºÅÒý½Å
KEY.GPIO_PuPd = GPIO_PuPd_UP;//ÉÏÀģʽ---½«IOÒý½ÅǶÌ×ÔÚÒ»¸ö±È½Ï¸ßµÄµçƽÀïÃæ
KEY.GPIO_Speed = GPIO_High_Speed;//¸ßËÙ
GPIO_Init(GPIOA,&KEY);
//¿ªÆôGPIOEµÄʱÖÓ£¬
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE,ENABLE);
//³õʼ»¯°´¼üPE2,PE3,PE4
KEY.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4;
GPIO_Init(GPIOE,&KEY);
}
key.h
#ifndef _KEY_H_
#define _KEY_H_
#include "stm32f4xx.h"
void key_init(void);
#endif
beep.c
#include "beep.h"
void beep_init(void)
{
GPIO_InitTypeDef BEEP;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF,ENABLE);
BEEP.GPIO_Mode = GPIO_Mode_OUT;//ÅäÖÃΪÊäÈëģʽ
BEEP.GPIO_Pin = GPIO_Pin_8 ;//Ñ¡ÖÐ0ºÅÒý½Å
BEEP.GPIO_Mode = GPIO_Mode_OUT;
BEEP.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOF,&BEEP);
}
beep.h
#ifndef _BEEP_H_
#define _BEEP_H_
#include "stm32f4xx.h"
void beep_init(void);
#endif
delay.c
#include "delay.h"
void delay(int x)
{
int i,j;
for(i=0;i<x;i++)
for(j=0;j<1000;j++);
}
delay.h
#ifndef _DELAY_H_
#define _DELAY_H_
#include "stm32f4xx.h"
void delay(int x);
#endif
sys.h(位帶映射)
#ifndef __SYS_H
#define __SYS_H
#include "stm32f4xx.h"
//ÐèÒª²Ù×÷µÄÒý½Å±àºÅ
#define BITBAND(addr, bitnum) ((0x42000000+((addr &0x000FFFFF)<<5)+(bitnum<<2)))
#define MEM_ADDR(addr) *((volatile unsigned long *)(addr))
#define BIT_ADDR(addr, bitnum) MEM_ADDR(BITBAND(addr, bitnum))
//IO¿ÚµØÖ·Ó³Éä
//Êä³ö¼Ä´æÆ÷Ó³Éä
#define GPIOA_ODR_Addr (GPIOA_BASE+0x14) //0x40020014
#define GPIOB_ODR_Addr (GPIOB_BASE+0x14) //0x40020414
#define GPIOC_ODR_Addr (GPIOC_BASE+0x14) //0x40020814
#define GPIOD_ODR_Addr (GPIOD_BASE+0x14) //0x40020C14
#define GPIOE_ODR_Addr (GPIOE_BASE+0x14) //0x40021014
#define GPIOF_ODR_Addr (GPIOF_BASE+0x14) //0x40021414
#define GPIOG_ODR_Addr (GPIOG_BASE+0x14) //0x40021814
//ÊäÈë¼Ä´æÆ÷Ó³Éä
#define GPIOA_IDR_Addr (GPIOA_BASE+0x10) //0x40020010
#define GPIOB_IDR_Addr (GPIOB_BASE+0x10) //0x40020410
#define GPIOC_IDR_Addr (GPIOC_BASE+0x10) //0x40020810
#define GPIOD_IDR_Addr (GPIOD_BASE+0x10) //0x40020C10
#define GPIOE_IDR_Addr (GPIOE_BASE+0x10) //0x40021010
#define GPIOF_IDR_Addr (GPIOF_BASE+0x10) //0x40021410
#define GPIOG_IDR_Addr (GPIOG_BASE+0x10) //0x40021810
#define PAout(n) BIT_ADDR(GPIOA_ODR_Addr,n) //Êä³ö
#define PAin(n) BIT_ADDR(GPIOA_IDR_Addr,n) //ÊäÈë
#define PBout(n) BIT_ADDR(GPIOB_ODR_Addr,n) //Êä³ö
#define PBin(n) BIT_ADDR(GPIOB_IDR_Addr,n) //ÊäÈë
#define PCout(n) BIT_ADDR(GPIOC_ODR_Addr,n) //Êä³ö
#define PCin(n) BIT_ADDR(GPIOC_IDR_Addr,n) //ÊäÈë
#define PDout(n) BIT_ADDR(GPIOD_ODR_Addr,n) //Êä³ö
#define PDin(n) BIT_ADDR(GPIOD_IDR_Addr,n) //ÊäÈë
#define PEout(n) BIT_ADDR(GPIOE_ODR_Addr,n) //Êä³ö
#define PEin(n) BIT_ADDR(GPIOE_IDR_Addr,n) //ÊäÈë
#define PFout(n) BIT_ADDR(GPIOF_ODR_Addr,n) //Êä³ö
#define PFin(n) BIT_ADDR(GPIOF_IDR_Addr,n) //ÊäÈë
#define PGout(n) BIT_ADDR(GPIOG_ODR_Addr,n) //Êä³ö
#define PGin(n) BIT_ADDR(GPIOG_IDR_Addr,n) //ÊäÈë
#endif
關于位帶映射的部分,我會在我的下一篇部落格中詳細介紹