stm32 起步 gpio操作

1. 在工程中增加gpio lib.h和stm32头文件,如下：
   #include “stm32f10x.h” // Device header
   #include “stm32f10x_gpio.h”

2. 调用lib配置gpio工作方式，先开启时钟，选GPIO，设置GPIO mode，gpio speed,主要看GPIO_InitTypeDef 结构体，芯片不同结构体不同，开始不清楚具体使用可以参考系统自带的example code，my setting如下：
   void GPIO_Initmain(void)
   {
   GPIO_InitTypeDef GPIO_InitStructure;
   /* 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 ***************************************/
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE);

   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4|GPIO_Pin_3|GPIO_Pin_2;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_Init(GPIOD, &GPIO_InitStructure);
   }

3. 初始化后，操作GPIO，GPIO操作可以参考gpio的lib，调用lib实现gpio操作,如下：
   /**增加一个delay
   
   • @brief Inserts a delay time.
   • @param nCount: specifies the delay time length.
   • @retval None
     */
     void Delay(__IO u32 nCount)
     {
     for(; nCount != 0; nCount–);
     }

int main(void)
{
GPIO_Initmain(); //初始化
while (1)
{
/* Turn on LD1 */
GPIO_ResetBits(GPIOD,GPIO_Pin_2); // IO 口拉低
GPIO_SetBits(GPIOD,GPIO_Pin_3); // IO 口拉高
GPIO_SetBits(GPIOD,GPIO_Pin_4);
Delay(0xAFFFF);
Delay(0xAFFFF);
Delay(0xAFFFF);
Delay(0xAFFFF);
Delay(0xAFFFF);
GPIO_SetBits(GPIOD,GPIO_Pin_2);
GPIO_ResetBits(GPIOD,GPIO_Pin_3);
GPIO_SetBits(GPIOD,GPIO_Pin_4);
Delay(0xAFFFF);
Delay(0xAFFFF);
Delay(0xAFFFF);
Delay(0xAFFFF);
Delay(0xAFFFF);
GPIO_SetBits(GPIOD,GPIO_Pin_2);
GPIO_SetBits(GPIOD,GPIO_Pin_3);
GPIO_ResetBits(GPIOD,GPIO_Pin_4);
Delay(0xAFFFF);
Delay(0xAFFFF);
Delay(0xAFFFF);
Delay(0xAFFFF);
Delay(0xAFFFF);
}
}
4.编译后down load运行，GPIO操作成功。

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