AVR Freaks

Hi,

I was using the atmel start example for reading and writing to flash as illustrated below:

The problem im seeing is that when I power off the system and power back on again the data written to addess 0x3200 is no longer retained.

I can see the memory being written to via the memory view window in Atmel studio (currently using the SAMD21 Xplained Pro) via USB.

Im sorry if I have isunderstood the example and the data sheet but as far as I was aware the SAMD21 between the regions 0x00000000 to 0x00040000 is available and non-volatile.

Can anyone please help?

#include <peripheral_clk_config.h>
#include <utils.h>
#include <hal_init.h>
#include <hpl_gclk_base.h>
#include <hpl_pm_base.h>

struct flash_descriptor FLASH_0;

void FLASH_0_CLOCK_init(void)
{
	_pm_enable_bus_clock(PM_BUS_APBB, NVMCTRL);
}

void FLASH_0_init(void)
{
	FLASH_0_CLOCK_init();
	flash_init(&FLASH_0, NVMCTRL);
}

void system_init(void)
{
	init_mcu();

	FLASH_0_init();
}

void FLASH_0_example(void)
{
	uint32_t page_size;
	uint16_t i;

	/* Init source data */
	page_size = flash_get_page_size(&FLASH_0);

	for (i = 0; i < page_size; i++) {
		src_data[i] = i;
	}

	/* Write data to flash */
	flash_write(&FLASH_0, 0x3200, src_data, page_size);

	/* Read data from flash */
	flash_read(&FLASH_0, 0x3200, chk_data, page_size);
}