STM32L031写Flash不使用HAL库

Posted 2022-02-01 シ゛甜虾

解锁

void flash_unlock(void)

  /* (1) Wait till no operation is on going */
	/* (2) Check if the PELOCK is unlocked */
	/* (3) Perform unlock sequence */
	while ((FLASH->SR & FLASH_SR_BSY) != 0) /* (1) */
	
	/* For robust implementation, add here time-out management */
	
	if ((FLASH->PECR & FLASH_PECR_PELOCK) != 0) /* (2) */
	
	 FLASH->OPTKEYR = 0xFBEAD9C8;
	 FLASH->OPTKEYR = 0x24252627;
	 FLASH->PEKEYR = 0x89ABCDEFU;
   FLASH->PEKEYR = 0x02030405U;
	
	FLASH->PRGKEYR = 0x8C9DAEBF;
  FLASH->PRGKEYR = 0x13141516;

擦除，这个芯片每页是128字节，别当成256

void flash_erase(void)

 uint32_t addr = 0;
  
  /* 解锁flash */
  __disable_irq();
  flash_unlock();
  
  /* 擦除对应扇区 */
  for(addr = UPDATE_ADDR; addr < END_ADDR; addr += 128)
  
    FLASH->PECR |= FLASH_PECR_ERASE | FLASH_PECR_PROG; /* (1) */
	 *(__IO uint32_t *)addr = (uint32_t)0; /* (2) */
	 while ((FLASH->SR & FLASH_SR_BSY) != 0) /* (3) */
	 
	 /* For robust implementation, add here time-out management */
	 
	 if ((FLASH->SR & FLASH_SR_EOP) != 0) /* (4) */
	 
	 FLASH->SR = FLASH_SR_EOP; /* (5) */
	 
	 else
	 
	 /* Manage the error cases */
	 
	 FLASH->PECR &= ~(FLASH_PECR_ERASE | FLASH_PECR_PROG); /* (6) */
  
  
  /* 加锁flash */
  while ((FLASH->SR & FLASH_SR_BSY) != 0) /* (1) */
	
	 /* For robust implementation, add here time-out management */
	
	FLASH->PECR |= FLASH_PECR_PELOCK; /* (2) */
  __enable_irq();

写Flash

void flash_write(uint32_t addr, uint8_t* data, uint16_t len)

	uint32_t old_addr = addr;
	uint32_t i = 0;

	__disable_irq();
  flash_unlock();
  
  /* 写数据 */
  while(1)
	
		/* (1) Perform the data write (32-bit word) at the desired address */
		/* (2) Wait until the BSY bit is reset in the FLASH_SR register */
		/* (3) Check the EOP flag in the FLASH_SR register */
		/* (4) clear it by software by writing it at 1 */
		*(__IO uint32_t*)(addr + UPDATE_ADDR + i) = ((uint32_t)data[i+3]<<24)+((uint32_t)data[i+2]<<16)+((uint32_t)data[i+1]<<8)+((uint32_t)data[0]);
		while ((FLASH->SR & FLASH_SR_BSY) != 0) /* (2) */
		
		 /* For robust implementation, add here time-out management */
		
		if ((FLASH->SR & FLASH_SR_EOP) != 0) /* (3) */
		
		 FLASH->SR = FLASH_SR_EOP; /* (4) */
		
		LL_mDelay(1);
		i+=4;
		if(i>=len)
		
			break;
		
	
  /* 加锁flash */
  while ((FLASH->SR & FLASH_SR_BSY) != 0) /* (1) */
	
	 /* For robust implementation, add here time-out management */
	
	FLASH->PECR |= FLASH_PECR_PELOCK; /* (2) */
	
	flash_test_read(old_addr);
	__enable_irq();