stm32 检测到按键按下 灯亮 否则灯不亮
/****************************************************************************
* File Name : key_led.c.c
* Author : MCD Application Team
* FW Version : V2.0.1
* Date : 06/11/2012
* Description : This file provides all the RCC firmware functions.
*开发板 :神舟三号
* 现象 :如程序执行前按住按键USER2 LED亮起,没按则灯不亮
*****************************************************************************
*/
#include "stm32f10x_lib.h"
///////////// define LED ///////////////
#define RCC_GPIO_LED RCC_APB2Periph_GPIOF
#define GPIO_LED GPIOF
#define GPIO_LED_PIN GPIO_Pin_6
///////////// define KEY ///////////////
#define RCC_GPIO_KEY RCC_APB2Periph_GPIOD
#define GPIO_KEY GPIOD
#define GPIO_KEY_PIN GPIO_Pin_3
///////////// define Beep ///////////////
#define RCC_GPIO_BEEP RCC_APB2Periph_GPIOB
#define GPIO_BEEP GPIOB
#define GPIO_BEEP_PIN GPIO_Pin_10
///////////// config LED ///////////////
void LED_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
// RCC_ABP2PeriphClockCmd(RCC_GPIO_LED,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_LED_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
// GPIO_SetBits(GPIO_LED,GPIO_LED_PIN); //初始化完成才能使用输出功能
GPIO_Init(GPIO_LED, &GPIO_InitStructure);
GPIO_SetBits(GPIO_LED,GPIO_LED_PIN);
}
void LED_Turn_on(void)
{
GPIO_ResetBits(GPIO_LED,GPIO_LED_PIN);
}
void LED_Turn_off(void)
{
GPIO_SetBits(GPIO_LED,GPIO_LED_PIN);
}
///////////// config KEY ///////////////
void KEY_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
// RCC_ABP2PeriphClockCmd(RCC_GPIO_KEY,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_KEY_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//需要配置速率
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIO_KEY, &GPIO_InitStructure);
}
int Is_KeyDown(void)
{
if( !GPIO_ReadInputDataBit(GPIO_KEY,GPIO_KEY_PIN) )
{
return 1 ;
}
else
return 0 ;
}
/////// RccConfig///////
void RccConfiguration(void)
{
ErrorStatus HSEStartUpStatus;
/* RCC system reset(for debug purpose) */
RCC_DeInit();
/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON); //启动外部晶体震荡器
/* Wait till HSE is ready */
HSEStartUpStatus = RCC_WaitForHSEStartUp(); //等待启动完成
if(HSEStartUpStatus == SUCCESS) //如果启动成功,继续配置系统频率
{
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);//选择flash预取址缓存模式
/* Flash 2 wait state */
FLASH_SetLatency(FLASH_Latency_2); //设置flash存储器延时时钟周期数
/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1); //设置HCLK相对SYSCLK的分频比例 AHB时钟
/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1); //设置PCLK2相对SYSCLK的分频比例 设置高速AHB时钟
/* PCLK1 = HCLK/2 */
RCC_PCLK1Config(RCC_HCLK_Div2);
/* PLLCLK = 8MHz * 9 = 72 MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
/* Enable PLL */
RCC_PLLCmd(ENABLE);//启动PLL
/* Wait till PLL is ready */
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{
}
/* Select PLL as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
/* Wait till PLL is used as system clock source */
while(RCC_GetSYSCLKSource() != 0x08)
{
}
}
RCC_APB2PeriphClockCmd(RCC_GPIO_LED,ENABLE);
RCC_APB2PeriphClockCmd(RCC_GPIO_KEY,ENABLE);
RCC_APB2PeriphClockCmd(RCC_GPIO_BEEP,ENABLE);
}
//////// NvicConfig//////////
void NvicConfiguration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
#ifdef VECT_TAB_RAM
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
}
void ConfigureInterfaces(void)
{
/* System Clocks Configuration */
RccConfiguration(); //配置系统时钟
/* NVIC configuration */
NvicConfiguration(); //设置向量入口
}
int main(void)
{
ConfigureInterfaces();
LED_Config();
KEY_Config();
while(1)
{
if(Is_KeyDown()==1)
{
LED_Turn_on();
}
else
{
LED_Turn_off();
}
}
}
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