/* ------------------------------------------------------- ————————————
问题: 按键如何去抖。。这样延时等待 占用系统资源。 请教高手按键消抖问题,有什么更好的方法解决。
---------------------------------------————————————————————---------------*/
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_lib.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
GPIO_InitTypeDef GPIO_InitStructure; //声明结构体
/**********************************************************************
声明一个结构体,名字是GPIO_InitStructure,结构体原型由GPIO_InitTypeDef 确定,
stm32里面初始化GPIO用的吧。。设置完了GPIO_InitStructure里面的内容后
在GPIO_Init (GPIO_TypeDef *GPIOx, GPIO_InitTypeDef *GPIO_InitStruct)里面调用,
比如初始化pa口,就是
GPIO_Init (GPIOA, &GPIO_InitStructure),括号里后面那个就是你问题里面声明的那个结构体
***************************************************************************/
ErrorStatus HSEStartUpStatus;
/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void NVIC_Configuration(void);
void Delay(vu32 nCount);
/* Private functions ---------------------------------------------------------*/
void LED_GPIO_init()
{
//初始化 GPIOA 的时钟 库函数208页
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOD,ENABLE);
//初始化GPIO 见库函数 P125页 LED 两只接在 PA8 PD2
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_8; //要设置的PIN
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP; //推挽输出
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz; //输出速度
GPIO_Init(GPIOA,&GPIO_InitStructure); //初始化 IO
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_2; //要设置的PIN
GPIO_Init(GPIOD,&GPIO_InitStructure); //初始化 IO
GPIO_SetBits(GPIOD,GPIO_Pin_2); //初始化为高
GPIO_SetBits(GPIOA,GPIO_Pin_8); //初始化为高
}
void key_init() //按键初始化 PA13 PA15 KEY0 KEY1
{
//初始化 GPIOA 的时钟 库函数208页
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_13|GPIO_Pin_15; //要设置的PIN
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU; //上拉输入
GPIO_Init(GPIOA,&GPIO_InitStructure); //初始化 IO
// GPIO_SetBits(GPIOA,GPIO_Pin_13); //初始化为高
// GPIO_SetBits(GPIOA,GPIO_Pin_15); //初始化为高
}
/*******************************************************************************
* Function Name : main
* Description : Main program.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
int main(void)
{
u8 led_flag=0;
#ifdef DEBUG
debug();
#endif
/* System Clocks Configuration **********************************************/
RCC_Configuration();
/* NVIC Configuration *******************************************************/
NVIC_Configuration();
/* Configure all unused GPIO port pins in Analog Input mode (floating input
trigger OFF), this will reduce the power consumption and increase the device
immunity against EMI/EMC *************************************************/
key_init(); //按键初始化 PA13 PA15 KEY0 KEY1
LED_GPIO_init(); //初始化LED 函数
while (1)
{
if(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_15)==0) //如果按键按下
{
Delay(0xfff); //延时去抖
if(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_15)==0) //在判断一次
{
GPIO_ResetBits(GPIOD,GPIO_Pin_2); //置低 LED 亮
}
}
if(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_15)==1) //如果松开 为高
{
Delay(0xffff); //延时去抖
if(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_15)==1) //延时去抖在判断一次
{
GPIO_SetBits(GPIOD,GPIO_Pin_2); //置高 LED 灭
}
}
led_flag=!led_flag; //另一只灯 作为运行指示灯
if(led_flag==1)
{
GPIO_SetBits(GPIOA,GPIO_Pin_8); //灯灭
}
else
{
GPIO_ResetBits(GPIOA,GPIO_Pin_8); //灯亮
}
Delay(0xfffff);
}
}
/*******************************************************************************
* Function Name : RCC_Configuration
* Description : Configures the different system clocks.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void RCC_Configuration(void)
{
/* RCC system reset(for debug purpose) */
RCC_DeInit();
/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON);
/* Wait till HSE is ready */
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS)
{
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
/* Flash 2 wait state */
FLASH_SetLatency(FLASH_Latency_2);
/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);
/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);
/* 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);
/* 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)
{
}
}
}
/*******************************************************************************
* Function Name : NVIC_Configuration
* Description : Configures Vector Table base location.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void NVIC_Configuration(void)
{
#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
}
/*******************************************************************************
* Function Name : Delay
* Description : Inserts a delay time.
* Input : nCount: specifies the delay time length.
* Output : None
* Return : None
*******************************************************************************/
void Delay(vu32 nCount)
{
for(; nCount != 0; nCount--);
}
#ifdef DEBUG
/*******************************************************************************
* Function Name : assert_failed
* Description : Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* Input : - file: pointer to the source file name
* - line: assert_param error line source number
* Output : None
* Return : None
*******************************************************************************/
void assert_failed(u8* file, u32 line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/