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Altera_Forum's avatar
Altera_Forum
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14 years ago

How to use an EPCS Flash

Hallo together, I'm actually trying to save data from NIOS II into an EPCS64 device. My system contains an EPCS controller. But now the confusion is complete, there are so many files for usin...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Here there is my initialization, but is not different than your... 

    fd_epcs = alt_flash_open_dev(EPCS_FLASH_CONTROLLER_NAME);
	if (fd_epcs > 0)
	{
		alt_epcs_flash_get_info(fd_epcs, &flashInfo_epcs, &number_of_regions);
		if (number_of_regions && (flashInfo_epcs->offset == 0))
		{   
            printf("EPCS_FLASH block_size=%d region_size=%d\n", flashInfo_epcs->block_size, flashInfo_epcs->region_size);
		}		
		alt_flash_close_dev(fd_epcs);
	}

I suggest you to debug your device at startup placing some breakpoints within alt_epcs_flash_init function called within altera_sys_init by means of ALTERA_AVALON_EPCS_FLASH_CONTROLLER_INIT macro. I took a brief look to alt_epcs_flash_query function and I suppose that there shouldn't be any different behaviour between my EPCS flash device and yours. Within that function is only retrieved the size of memory device and corresponding region_size, number_of_blocks, and block_size.

My doubt is only that the kind of you memory (page erasable PE) is not fully supported by that drivers (is only a supposition because I didn't verified it).

Ciao