Writing/Reading into/from EPCS Flash Device

The epcs is quite simple to access with the standard APIs.

Reading flash data is straightforward. For writes, the only point you must make sure is that the location you want to write to is blank.

Otherwise you'll need to erase the whole block/sector: infact, like any other flash memory you can program single bytes but you can't erase them the same way.

Then try repeating your test after you added a block erase before writing the first data.

In the first post you talked about EPCS16 device and said it has 32 sectors of 24 bits each; this is not true EPCS16 indeed has 32 sector, but they are 64kBytes each.