Sayyiduna Ibn Umar (may Allah be pleased with him) narrates that in the blessed era of the Messenger of Allah (peace and blessings be upon him), Sadaqat al-Fitr was given from dates, raisins, and barley. Wheat was not given as charity.
Hadith Referenceصحيح ابن خزيمه / جماع أبواب صدقة الفطر فى رمضان / 2406