void initSPI_slave(void)
{
SPI2CON1bits.DISSDO = 0;// SDOx pin is controlled by the module SPI
SPI2CON1bits.MODE16 = 0; // communication is byte-wide (8 bits)
SPI2CON1bits.SMP = 1; // input data sampled after at end of data output data
SPI2CON1bits.CKE = 0; // data out on idle edge to active
SPI2CON1bits.CKP = 0; // idle state for CLK is a low level
SPI2CON1bits.MSTEN = 0; // master mode
SPI2STATbits.SPIROV = 0; // no receive overflow has occured
SPI2CON1bits.SSEN = 1; // ~SS pin used for Slave mode
SPI2STATbits.SPIEN = 1; // enable SPI module and configures SCKx,SDOx, SDIx and ~SSx as a serial port pins
}