Etepic

//////////
#include <xc.h>
#include <stdint.h>

#pragma config FOSC = HS, WDTE = ON, PWRTE = ON, BOREN = ON
#pragma config LVP = OFF, CPD = OFF, WRT = OFF, CP = OFF

#define _XTAL_FREQ 8000000

#define CSN    RA5
#define CE      RB5
#define LED_TX  RB1

uint16_t adc0, adc1, adc_sum;
uint8_t tx_ready = 1;

// ================= SPI =================
void SPI_Init(void)
{
    TRISC3 = 0;
    TRISC5 = 0;
    TRISC4 = 1;
    SSPSTAT = 0x40;
    SSPCON  = 0x21;
}

unsigned char SPI_RW(unsigned char d)
{
    SSPBUF = d;
    while(!BF);
    return SSPBUF;
}

// ================= NRF =================
void NRF_WriteReg(unsigned char reg, unsigned char val)
{
    CSN = 0;
    SPI_RW(0x20 | reg);
    SPI_RW(val);
    CSN = 1;
}

unsigned char NRF_ReadReg(unsigned char reg)
{
    unsigned char val;
    CSN = 0;
    SPI_RW(reg);
    val = SPI_RW(0xFF);
    CSN = 1;
    return val;
}

void NRF_Command(unsigned char cmd)
{
    CSN = 0;
    SPI_RW(cmd);
    CSN = 1;
}

// ================= ADC =================
uint16_t ADC_Read(uint8_t ch)
{
    ADCON0 &= 0xC7;
    ADCON0 |= (ch << 3);
    __delay_us(5);
    GO_nDONE = 1;
    while(GO_nDONE);
    return (  (uint16_t)ADRESH << 8  ) | ADRESL;
}

// ================= MAIN =================
void main(void)
{
    TRISA0 = 1;
    TRISA1 = 1;
    TRISA5 = 0;
    TRISB1 = 0;
    TRISB5 = 0;

    LED_TX = 0;
    CSN = 1;
    CE  = 0;

    ADCON1 = 0x84;
    ADCON0 = 0x81;

    SPI_Init();
    __delay_ms(100);

    unsigned char addr[5] = {0xE7,0xE7,0xE7,0xE7,0xE7};

    NRF_WriteReg(0x00, 0x0E);  // TX
    NRF_WriteReg(0x01, 0x3F);
    NRF_WriteReg(0x02, 0x01);
    NRF_WriteReg(0x03, 0x03);
    NRF_WriteReg(0x05, 40);
    NRF_WriteReg(0x06, 0x06);

    NRF_WriteReg(0x11, 1);
    NRF_WriteReg(0x10, addr
[o]);

    NRF_Command(0xE1);
    NRF_WriteReg(0x07, 0x70);

    while(1)
    {
        CLRWDT();

        adc0 = ADC_Read(0);
        adc1 = ADC_Read(1);
        adc_sum = adc0 + adc1;

        if(adc_sum > 1525 && tx_ready)
        {
            tx_ready = 0;

            NRF_Command(0xE1);
            NRF_WriteReg(0x07, 0x70);

            CSN = 0;
            SPI_RW(0xA0);
            SPI_RW(0xA5);
            CSN = 1;

            CE = 1;
            __delay_us(20);
            CE = 0;

            LED_TX = 1;
            __delay_ms(200);
            LED_TX = 0;
        }

        if(adc_sum < 1525)
            tx_ready = 1;

        __delay_ms(40);
    }
}

/////////
#include <xc.h>
#include <stdint.h>

#pragma config FOSC = HS, WDTE = ON, PWRTE = ON, BOREN = ON
#pragma config LVP = OFF, CPD = OFF, WRT = OFF, CP = OFF

#define _XTAL_FREQ 8000000

#define CSN    RA5
#define CE      RB5
#define LED_RX  RB1

// ================= SPI =================
void SPI_Init(void)
{
    TRISC3 = 0;
    TRISC5 = 0;
    TRISC4 = 1;
    SSPSTAT = 0x40;
    SSPCON  = 0x21;
}

unsigned char SPI_RW(unsigned char d)
{
    SSPBUF = d;
    while(!BF);
    return SSPBUF;
}

// ================= NRF =================
void NRF_WriteReg(unsigned char reg, unsigned char val)
{
    CSN = 0;
    SPI_RW(0x20 | reg);
    SPI_RW(val);
    CSN = 1;
}

unsigned char NRF_ReadReg(unsigned char reg)
{
    unsigned char val;
    CSN = 0;
    SPI_RW(reg);
    val = SPI_RW(0xFF);
    CSN = 1;
    return val;
}

void NRF_Command(unsigned char cmd)
{
    CSN = 0;
    SPI_RW(cmd);
    CSN = 1;
}

void NRF_WriteBuf(unsigned char reg, unsigned char *buf, unsigned char len)
{
    CSN = 0;
    SPI_RW(0x20 | reg);
    for(unsigned char i = 0; i < len; i++)
        SPI_RW(buf[i]);
    CSN = 1;
}

// ================= MAIN =================
void main(void)
{
    TRISA5 = 0;
    TRISB1 = 0;
    TRISB5 = 0;

    LED_RX = 0;
    CSN = 1;
    CE  = 0;

    SPI_Init();
    __delay_ms(100);

    unsigned char addr[5] = {0xE7,0xE7,0xE7,0xE7,0xE7};

    NRF_WriteReg(0x00, 0x0F);  // RX mode
    NRF_WriteReg(0x01, 0x3F);
    NRF_WriteReg(0x02, 0x01);
    NRF_WriteReg(0x03, 0x03);
    NRF_WriteReg(0x05, 40);
    NRF_WriteReg(0x06, 0x06);
    NRF_WriteReg(0x11, 1);

    NRF_WriteBuf(0x0A, addr, 5);

    NRF_Command(0xE1);          // FLUSH_TX
    NRF_Command(0xE2);          // FLUSH_RX
    NRF_WriteReg(0x07, 0x70);  // clear flags

    CE = 1;

    while(1)
    {
        CLRWDT();

        unsigned char status = NRF_ReadReg(0x07);

        if(status & 0x40)      // RX_DR
        {
            CE = 0;            // RX durdur

            CSN = 0;
            SPI_RW(0x61);      // R_RX_PAYLOAD
            SPI_RW(0xFF);
            CSN = 1;

            NRF_WriteReg(0x07, 0x40);
            NRF_Command(0xE2);  // RX FIFO flush

            LED_RX = 1;
            __delay_ms(1000);
            LED_RX = 0;

            CE = 1;            // RX tekrar aktif
        }
    }
}