void initSPI()
{
    // enable SPI1
    ANSELA = 0;
    ANSELC = 0;
    TRISAbits.TRISA5 = 0; //1;
    PORTAbits.RA5 = 1;
    TRISCbits.TRISC3 = 0; //1;
    TRISCbits.TRISC4 = 1;
    TRISCbits.TRISC5 = 0;

    SSP1STATbits.SMP = 1;
    SSP1STATbits.CKE = 1;
    SSP1CON1bits.CKP = 0;
    SSP1CON1bits.SSPM = 0;
    SSP1CON1bits.SSPEN = 1;

}

void    mrf24j40_regWrite(uint8_t reg, uint8_t data)
{
    SS_LOW
    sendSPI((reg << 1) | 1);
    sendSPI(data);
    SS_HIGH
}

uint8_t mrf24j40_regRead(uint8_t reg)
{
    uint8_t ret;
    SS_LOW
    sendSPI(reg << 1);
    ret = sendSPI(0xFF);
    SS_HIGH
    return ret;
}

void    mrf24j40_memWrite(uint16_t addr, uint8_t data)
{
    SS_LOW
    sendSPI((((uint8_t)(addr>>3))&0x7F)|0x80);
    sendSPI((((uint8_t)(addr<<5))&0xE0)|0x10);
    sendSPI(data);
    SS_HIGH
}

uint8_t mrf24j40_memRead(uint16_t addr)
{
    uint8_t ret;
    SS_LOW
    sendSPI((((uint8_t)(addr>>3))&0x7F)|0x80);
    sendSPI((((uint8_t)(addr<<5))&0xE0));
    ret = sendSPI(0xFF);
    SS_HIGH
    return ret;
}


uint8_t d1, d2;
/*
*
*/
int main(int argc, char** argv) {

    init();

    // MRF24J40MA reset
    PORTCbits.RC2 = 0;
    __delay_ms(10);
    PORTCbits.RC2 = 1;
    __delay_ms(30);


    // можно закомментировать, ничего не меняется
    mrf24j40_init(26);
    for (int i = 0; i < 8; i++) {

        mrf24j40_memWrite( i+100, 0x79);
        mrf24j40_memRead(  i+100);
        mrf24j40_regWrite(0x10 + i, 0xFF - i);
        d2 = mrf24j40_regRead(0x10 + i);
   }
..
}

void init() {
    TRISA = 0xF0;
    TRISB = 0xE7;
    // turn off analog inputs
    ANSELB = 0;
    //weak pullup is on by default
    // enable timer0
    T0CONbits.T0CS = 0; //internal timer
    T0CONbits.T0PS = 1; //1:4 - 4 uS clock
    T0CONbits.PSA = 1; //assign prescaler
    T0CONbits.TMR0ON = 1;


    initSPI();

    //MRFJ24 reset pin
    PORTCbits.RC2 = 1;
    TRISCbits.TRISC2 = 0;

}