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Код: Выделить всё

static uint8_t mac_buffer[64];

static void NVM_config(void)
{
	// Turn on the digital interface clock
	PM->APBBMASK.reg |= PM_APBBMASK_NVMCTRL;
	// Clear error flags
	NVMCTRL->STATUS.reg |= NVMCTRL_STATUS_MASK;
	// Writing configuration to the CTRLB register
	NVMCTRL->CTRLB.reg = NVMCTRL_CTRLB_SLEEPPRM(NVM_SLEEP_POWER_MODE_WAKEONACCESS) | \
		((true & 0x01) << NVMCTRL_CTRLB_MANW_Pos) | NVMCTRL_CTRLB_RWS(NVMCTRL->CTRLB.bit.RWS) \
		| ((false & 0x01) << NVMCTRL_CTRLB_CACHEDIS_Pos) \
		| NVMCTRL_CTRLB_READMODE(NVM_CACHE_READMODE_NO_MISS_PENALTY);
}

static void NVM_read_buffer(uint32_t source_address, uint8_t *buffer, uint8_t length)
{	
	NVMCTRL->STATUS.reg |= NVMCTRL_STATUS_MASK; // Clear error flags
	uint32_t page_address = source_address / 2;
	// NVM _must_ be accessed as a series of 16-bit words, perform manual copy to ensure alignment
	for (uint16_t i = 0; i < length; i += 2) 
	{
		// Fetch next 16-bit chunk from the NVM memory space
		uint16_t data = ((volatile uint16_t *)FLASH_ADDR)[page_address++];
		// Copy first byte of the 16-bit chunk to the destination buffer
		buffer[i] = (data & 0xFF);
		// If we are not at the end of a read request with an odd byte count, store the next byte of data as well
		if (i < (length - 1))
			buffer[i + 1] = (data >> 8);
	}
}
 
int main (void)
{
	system_init();
	
	NVM_config();
	
	memset(&mac_buffer, 0, 64);
	NVM_read_buffer(NVMCTRL_AUX0_ADDRESS, &mac_buffer[0], 8);
	
	while (1)
	{
		asm volatile("nop"::);
	}
}