receiver/firmware/main.cpp

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/* Project info here */

#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>

#include "usart.h"

#define SCK 7
#define SDI 6
#define SDO 5
#define CS 4 // NSEL
#define NIRQ 2

#define HI(x) PORTB |= (1<<(x))
#define LO(x) PORTB &= ~(1<<(x))
#define WAIT_NIRQ_LOW() while(PIND & (1<<NIRQ))


USART32(usb);

void portInit(){
        HI(CS);
        HI(SDI);
        LO(SCK);
        DDRB = (1<<CS)|(1<<SDI)|(1<<SCK);
        DDRD = (1 << PD6);
}

unsigned int writeCmd(unsigned int cmd){
        unsigned char i;
        unsigned int recv;
        recv = 0;
        LO(SCK);
        LO(CS);
        for(i=0; i<16; i++){
                if(cmd & 0x8000) HI(SDI);
                else LO(SDI);
                
            HI(SCK);
                recv <<= 1;
                if(PINB & (1<<SDO)){
                        recv |= 0x0001;
                }
                
                LO(SCK);
                cmd <<= 1;
        }
        HI(CS);
        return recv;
}

void rfInit(){
        writeCmd(0x80E7); // EL,EF,868band,12.0pF 
        writeCmd(0x8299); // !er,!ebb,ET,ES,EX,!eb,!ew,DC 
        writeCmd(0xA640); // frequency select 
        writeCmd(0xC647); // 4.8kbps 
        writeCmd(0x94A0); // VDI,FAST,134kHz,0dBm,-103dBm 
        writeCmd(0xC2AC); // AL,!ml,DIG,DQD4 
        writeCmd(0xCA81); // FIFO8,SYNC,!ff,DR 
        writeCmd(0xCED4); // SYNC=2DD4AG 
        writeCmd(0xC483); // @PWR,NO RSTRIC,!st,!fi,OE,EN 
        writeCmd(0x9850); // !mp,90kHz,MAX OUT 
        writeCmd(0xCC17); // OB1ACOB0, LPX,Iddy,CDDIT,CBW0 
        writeCmd(0xE000); // NOT USED 
        writeCmd(0xC800); // NOT USED 
        writeCmd(0xC040); // 1.66MHz,2.2V
}

unsigned char rfRecv(){
        unsigned int data;
        while(1){
                usb << "rfRecv: ";
                data = writeCmd(0x0000);
                usb << (int)data << '\n' << '\r';
                if ( (data & 0x8000) ) {
                        data = writeCmd(0xB000);
                        return (data & 0x00FF);
                }
        }
}

void FIFOReset(){
        writeCmd(0xCA81);
        writeCmd(0xCA83);
}

void rfSend(unsigned char data){
        WAIT_NIRQ_LOW();
        writeCmd(0xB800 + data);
}

void rfSendPackage(){
        writeCmd(0x0000);
        rfSend(0xAA); // PREAMBLE
        rfSend(0xAA); // PREAMBLE
        rfSend(0xAA); // PREAMBLE
        rfSend(0x2D); // SYNC
        rfSend(0xD4);
        
        // send 16 bytes package
        for(int i=0; i<16; i++){
                rfSend(0x30 + i);
        }
        
        rfSend(0xAA); // DUMMY
        rfSend(0xAA); // DUMMY
        rfSend(0xAA); // DUMMY
}

int main(){
        
        sei();
        unsigned char data, i;
        portInit();
        rfInit();
        FIFOReset();
        
        usb << "READY TO GO\n";
        
        while(1){
                for(i=0; i<16; i++){
                        data = rfRecv();
                        // usart send
                        usb << "data: ";
                        usb << data;
                        usb << "        num: ";
                        usb << (int)data;
                        usb << "\n\r";
                }
                FIFOReset();
        }

        
        return 0;
}