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/* 本實驗使得GPIO的PD2和PD3管腳控制STM32神舟IV號開發板的LED1和LED2兩個燈進行閃爍 */
#define __IO volatile
typedef unsigned int uint32_t;
typedef __IO uint32_t vu32;
typedef unsigned short int uint16_t;
#define GPIO_Pin_0 ((uint16_t)0x0001) /*!< Pin 0 selected */
#define GPIO_Pin_1 ((uint16_t)0x0002) /*!< Pin 1 selected */
#define GPIO_Pin_2 ((uint16_t)0x0004) /*!< Pin 2 selected */
#define GPIO_Pin_3 ((uint16_t)0x0008) /*!< Pin 3 selected */
#define GPIO_Pin_4 ((uint16_t)0x0010) /*!< Pin 4 selected */
#define GPIO_Pin_5 ((uint16_t)0x0020) /*!< Pin 5 selected */
#define GPIO_Pin_6 ((uint16_t)0x0040) /*!< Pin 6 selected */
#define GPIO_Pin_7 ((uint16_t)0x0080) /*!< Pin 7 selected */
#define GPIO_Pin_8 ((uint16_t)0x0100) /*!< Pin 8 selected */
#define GPIO_Pin_9 ((uint16_t)0x0200) /*!< Pin 9 selected */
#define GPIO_Pin_10 ((uint16_t)0x0400) /*!< Pin 10 selected */
#define GPIO_Pin_11 ((uint16_t)0x0800) /*!< Pin 11 selected */
#define GPIO_Pin_12 ((uint16_t)0x1000) /*!< Pin 12 selected */
#define GPIO_Pin_13 ((uint16_t)0x2000) /*!< Pin 13 selected */
#define GPIO_Pin_14 ((uint16_t)0x4000) /*!< Pin 14 selected */
#define GPIO_Pin_15 ((uint16_t)0x8000) /*!< Pin 15 selected */
#define GPIO_Pin_All ((uint16_t)0xFFFF) /*!< All pins selected */
#define RCC_APB2Periph_AFIO ((uint32_t)0x00000001)
#define RCC_APB2Periph_GPIOA ((uint32_t)0x00000004)
#define RCC_APB2Periph_GPIOB ((uint32_t)0x00000008)
#define RCC_APB2Periph_GPIOC ((uint32_t)0x00000010)
#define RCC_APB2Periph_GPIOD ((uint32_t)0x00000020)
/************ GPIOD <*************/
typedef struct
{
__IO uint32_t CRL;
__IO uint32_t CRH;
__IO uint32_t IDR;
__IO uint32_t ODR;
__IO uint32_t BSRR;
__IO uint32_t BRR;
__IO uint32_t LCKR;
} GPIO_TypeDef;
typedef struct
{
__IO uint32_t CR;
__IO uint32_t CFGR;
__IO uint32_t CIR;
__IO uint32_t APB2RSTR;
__IO uint32_t APB1RSTR;
__IO uint32_t AHBENR;
__IO uint32_t APB2ENR;
__IO uint32_t APB1ENR;
__IO uint32_t BDCR;
__IO uint32_t CSR;
} RCC_TypeDef;
/********* GPIOD管腳的內存對應地址 *******/
#define PERIPH_BASE ((uint32_t)0x40000000)
#define APB2PERIPH_BASE (PERIPH_BASE + 0x10000)
#define GPIOD_BASE (APB2PERIPH_BASE + 0x1400)
#define GPIOD ((GPIO_TypeDef *) GPIOD_BASE)
/************ RCC時鐘 <*************/
#define AHBPERIPH_BASE (PERIPH_BASE + 0x20000)
#define RCC_BASE (AHBPERIPH_BASE + 0x1000)
#define RCC ((RCC_TypeDef *) RCC_BASE)
void Delay(vu32 nCount);
int main(void) //main是程序入口
{
/* 使能APB2總線的時鐘，對GPIO的端口D時鐘使能 */
RCC->APB2ENR |= RCC_APB2Periph_GPIOD;
/*-- GPIO Mode Configuration速度，輸入或輸出 -----------------------*/
/*-- GPIO CRL Configuration 設置IO端口低8位的模式（輸入還是輸出）---*/
/*-- GPIO CRH Configuration 設置IO端口高8位的模式（輸入還是輸出）---*/
GPIOD->CRL &= 0xFFFF00FF;
GPIOD->CRL |= 0x00003300; /* 設置GPIOD的PD2和PD3配置為通用推挽模式輸出50MHZ */
while (1)
{
/* 對BRR設置為1，則GPIO輸出為0 */
GPIOD->BRR = GPIO_Pin_2;
GPIOD->BRR = GPIO_Pin_3;
Delay(0x2FFFFF);
……………………
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