NANO100:Using data flash without the external 12M HZ crystal.

The data flash start address is set by register so it need a reset after update the address, but in default it will use  the external 12M HZ crystal.It's need to modify the CFOSC .

Modify the \SampleCode\StdDriver\FMC_RW set_data_flash_base() function

	static int set_data_flash_base(uint32_t u32DFBA)
	{
	uint32_t au32Config[2];
	if (FMC_ReadConfig(au32Config, 2) < 0) {
	printf("\nRead User Config failed!\n");
	return -1;
	}
	if ((!(au32Config[0] & 0x1)) && (au32Config[1] == u32DFBA))
	return 0;
	FMC_ENABLE_CFG_UPDATE();
	au32Config[0] &= ~0x1;
	au32Config[0] |= 0x1<<26; //Enable the HIRC
	au32Config[1] = u32DFBA;
	if (FMC_WriteConfig(au32Config, 2) < 0)
	return -1;
	printf("\nSet Data Flash base as 0x%x.\n", DATA_FLASH_TEST_BASE);
	// Perform chip reset to make new User Config take effect
	SYS->IPRST_CTL1 = SYS_IPRST_CTL1_CHIP_RST_Msk;
	return 0;
	}

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Ref:
     Nano100 Series Technical Reference Manual