STM32 الجزء الثالث: المشروع الأول

نلاحظ مجتمعًا يعتمد بشكل متزايد على الآلات ، ولكن في نفس الوقت يستخدمها بشكل أكثر فاعلية. - دوجلاس روشكوف

#define RCC_BASE   0x40023800

typedef struct
{
  volatile unsigned int CR;           
  volatile unsigned int PLLCFGR;      
  volatile unsigned int CFGR;         
  volatile unsigned int CIR;          
  volatile unsigned int AHB1RSTR;     
  volatile unsigned int AHB2RSTR;     
  volatile unsigned int AHB3RSTR;     
  unsigned int          RESERVED0;    
  volatile unsigned int APB1RSTR;     
  volatile unsigned int APB2RSTR;     
  unsigned int          RESERVED1[2]; 
  volatile unsigned int AHB1ENR;      
  volatile unsigned int AHB2ENR;      
  volatile unsigned int AHB3ENR;      
  unsigned int          RESERVED2;    
  volatile unsigned int APB1ENR;      
  volatile unsigned int APB2ENR;      
  unsigned int          RESERVED3[2]; 
  volatile unsigned int AHB1LPENR;    
  volatile unsigned int AHB2LPENR;    
  volatile unsigned int AHB3LPENR;    
  unsigned int          RESERVED4;    
  volatile unsigned int APB1LPENR;    
  volatile unsigned int APB2LPENR;    
  unsigned int          RESERVED5[2]; 
  volatile unsigned int BDCR;         
  volatile unsigned int CSR;          
  unsigned int          RESERVED6[2]; 
  volatile unsigned int SSCGR;        
  volatile unsigned int PLLI2SCFGR;   
  volatile unsigned int PLLSAICFGR;   
  volatile unsigned int DCKCFGR1;     
  volatile unsigned int DCKCFGR2;     

} RCC_Struct;

#define RCC ((RCC_Struct *) RCC_BASE)

#define GPIO_BASE   0x40020000
#define GPIO_OFFSET 0x400

typedef struct
{
   volatile unsigned int MODER;   
   volatile unsigned int OTYPER;  
   volatile unsigned int OSPEEDR; 
   volatile unsigned int PUPDR;   
   volatile unsigned int IDR;     
   volatile unsigned int ODR;     
   volatile unsigned int BSRR;    
   volatile unsigned int LCKR;    
   volatile unsigned int AFR[2];  

} GPIO_Struct;

RCC->AHB1ENR = 0; 

extern void *_estack;

void Reset_Handler();
void Default_Handler();

//   
int  main();

void NMI_Handler()                    __attribute__ ((weak, alias ("Default_Handler")));
void HardFault_Handler()              __attribute__ ((weak, alias ("Default_Handler")));

void *vectors[] __attribute__((section(".isr_vector"), used)) = {
    &_estack,
	&Reset_Handler,
	&NMI_Handler,
	&HardFault_Handler
};

extern void *_sidata, *_sdata, *_edata, *_sbss, *_ebss;



void __attribute__((naked, noreturn)) Reset_Handler()
{


	void **pSource, **pDest;
	for (pSource = &_sidata, pDest = &_sdata; pDest != &_edata; pSource++, pDest++)
		*pDest = *pSource;

	for (pDest = &_sbss; pDest != &_ebss; pDest++)
		*pDest = 0;

    //   
    main();

	while(1);
}

void __attribute__((naked, noreturn)) Default_Handler(){
    while(1);
}

#include "rcc.h"
#include "gpio.h"


int main()
{
    //  GPIO I ,   8 ( )
    RCC->AHB1ENR |= (1<<8);

    //     
    //          
    //      
    volatile GPIO_Struct *GPIOI = (GPIO_Struct *)(GPIO_BASE + (GPIO_OFFSET*8));  

    //     ""
    GPIOI->MODER |= (1<<2);

    //   ,   , push-pull,   .
    //   push pull
    GPIOI->OTYPER &= ~(1<<1);

    //      ,       
    GPIOI->OSPEEDR |= (2<<2);

    //   
    while(1){
        for(volatile int i = 0; i < 1000000; i++){
            // 
        }

        // ,   1   0  .
        GPIOI->ODR ^= (1<<1);
    }

    return 0;
}

make