transmiter/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  1 // PB1
#define SDO  2 // PB2
#define SDI  3 // PB3
#define CS   0 // PB0 (NSEL, PB4)

#define NIRQ 0 // PD0

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

USART0(usb);

void portInit(){
        HI(CS);
        HI(SDI);
        LO(SCK);
        DDRB = (1<<CS)|(1<<SDI)|(1<<SCK);
        DDRD = 0;
}

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(0x8239); // !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
}

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

void rfSendPackage(){
        usb << "SENDING PACKAGE\n\r";
        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();
        asm("cli");
        _delay_ms(1000);
        
        usb << "ALL SYSTEMS GO\n\r";
        
        portInit();
        rfInit(); 
        
        while(1){
                usb << "USART TEST\n\r";
                rfSendPackage();
                _delay_ms(1000);
        }
        
}