I am using st micro controller (spear300) . While reading data from NOR flash ( M25p40 ) data is 0xFF
Write operation is not working at all . Read Device id and Read electronic signature is working fine
What will be the reason for read and write operation ...?
Erased data reads as 0xff, in so far reading may be correct. Regarding write operation, there may be either a problem of incorrect enable sequence, missing hardware enable or sector write protection.