stm32 学习－－－GPIO简单使用实例

#include "stm32f10x_lib.h"


GPIO_InitTypeDef GPIO_InitStructure;
ErrorStatus HSEStartUpStatus;


void RCC_Configuration(void);

int main(void)
{

    RCC_Configuration();  //使能系统时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);//使能管理GPIOB的时钟，没有这个，GPIOB不工作

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_Init(GPIOB, &GPIO_InitStructure);//根据GPIO_InitStructure的信息去初始化GPIOB

    GPIO_ResetBits(GPIOB,GPIO_Pin_9);//将PB9置低电平
    GPIO_SetBits(GPIOB,GPIO_Pin_9);//将PB9置高电平
    while (1)
    {
    }
}

/*******************************************************************************
* 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)
        {
        }
    }

}

#endif

/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/

补充：软件开发 , C++ ,