Method for transferring data over a three-wire SPI link

Abstract

Method for transferring data over a three-wire SPI link. Method for transferring data over a three-wire SPI link (106) between a master circuit (102) and a slave circuit (104), wherein: - data is transferred in packets (30) each comprising a payload (34) and a header (32) specifying the length of the packet payload, and - during a data transfer between the master and slave circuits (102, 104), the master circuit defines a number N of bytes to be transferred, then determines, after a transfer of N bytes from the master circuit to the slave circuit and N bytes from the slave circuit to the master circuit, a number of bytes remaining to be transferred from the slave circuit to the master circuit based on a value of the payload length included in the header of a data packet transferred from the slave circuit to the master circuit, this value being read by the master circuit. Figure for the abstract: Fig. 5