// RFM02-Funkmodul (Sender)
// Prozessor: ATMEGA8
// Frequenz: 434MHz
// Datenrate: 4,8kbps

// Programmablauf:
// Sendet Preamble, Frame-Recognition, 16 Datenbyte und Checksumme der 16 Datenbyte.
// Anschließend erfolgt eine Signalisierung mit LED2.
// Dies geschieht in einer Endlosschleife

#include <avr/io.h>

#define DDR_IN 			0
#define DDR_OUT 		1

#define DDR_LED 		DDRD
#define PORT_LED 		PORTD

#define PORT_SEL		PORTB
#define PIN_SEL			PINB
#define DDR_SEL			DDRB

#define PORT_SDI		PORTB
#define PIN_SDI			PINB
#define DDR_SDI			DDRB

#define PORT_SCK		PORTB
#define PIN_SCK			PINB
#define DDR_SCK			DDRB

#define PORT_SDO		PORTB
#define PIN_SDO			PINB
#define DDR_SDO			DDRB

#define PB7				7
#define PB6				6//  |
#define RFXX_SCK		5//  |
#define RFXX_SDO		4//  | RF_PORT
#define RFXX_SDI		3//  |
#define RFXX_SEL		2//  |
#define PB1				1//  |
#define PB0				0//  |

#define RFXX_DATA		7

#define SEL_OUTPUT()	DDR_SEL |= (1<<RFXX_SEL)
#define HI_SEL()		PORT_SEL |= (1<<RFXX_SEL)
#define LOW_SEL()		PORT_SEL&=~(1<<RFXX_SEL)

#define SDI_OUTPUT()	DDR_SDI |= (1<<RFXX_SDI)
#define HI_SDI()		PORT_SDI |= (1<<RFXX_SDI)
#define LOW_SDI()		PORT_SDI&=~(1<<RFXX_SDI)

#define SDO_INPUT()		DDR_SDO&=~(1<<RFXX_SDO)
#define SDO_HI()		PIN_SDO&(1<<RFXX_SDO)

#define SCK_OUTPUT()	DDR_SCK |= (1<<RFXX_SCK)
#define HI_SCK()		PORT_SCK |= (1<<RFXX_SCK)
#define LOW_SCK()		PORT_SCK &=~(1<<RFXX_SCK)

#define LED_OUTPUT()
#define LED1_ON() 		PORT_LED |= (1<<6)
#define LED1_OFF()		PORT_LED&=~(1<<6)

#define LED2_ON()		PORT_LED |= (1<<5)
#define LED2_OFF()		PORT_LED&=~(1<<5)

#define MODULE_ON()		PORT_LED |= (1<<4)
#define MODULE_OFF()	PORT_LED&=~(1<<4)

#define LED1_TRG()		PORT_LED^=(1<<6)

void Delay_ms(unsigned char amS)
{
	unsigned char i;
	unsigned int j;
	for(i=0; i<amS; i++)
	for(j=0; j<914; j++);
}

void RFXX_PORT_INIT(void)
{
	HI_SEL();
	HI_SDI();
	LOW_SCK();
	SEL_OUTPUT();
	SDI_OUTPUT();
	SDO_INPUT();
	SCK_OUTPUT();
}

unsigned int RFXX_WRT_CMD(unsigned int aCmd)
{
	unsigned char i;
	unsigned int temp;
	LOW_SCK();
	LOW_SEL();
	
	for(i=0; i<16; i++)
	{
		temp<<=1;
		if(SDO_HI())
		{
			temp|=0x0001;
		}
		LOW_SCK();
		if(aCmd&0x8000)
		{
			HI_SDI();
		}
		else
		{
			LOW_SDI();
		}
		HI_SCK();
		aCmd<<=1;
	};
	LOW_SCK();
	HI_SEL();
	return(temp);
}

void RF02B_SEND(unsigned char aByte)
{
	unsigned char i;
	for(i=0; i<8; i++)
	{
		while(PIND&(1<<2)); //Polling nIRQ
		while(!(PIND&(1<<2)));
		if(aByte&0x80)
		{
			PORTD |= (1<<RFXX_DATA);
		}
		else
		{
			PORTD&=~(1<<RFXX_DATA);
		}
		aByte<<=1;
	}
}



int main(void)
{
	unsigned int i, j, ChkSum;
	DDR_LED |= ((1<<6) | (1<<5) | (1<<7) | (1<<4)); //+FSKPIN+Module-Power

	LED_OUTPUT();
	MODULE_OFF(); //for reset
    LED1_ON();
	Delay_ms(200);
	LED1_OFF();
	Delay_ms(200);
	LED1_ON();
	Delay_ms(200);
	LED1_OFF();
	Delay_ms(200);
	LED1_ON();
	Delay_ms(200);
	LED1_OFF();
	Delay_ms(200);
	Delay_ms(200);
	Delay_ms(200);
	Delay_ms(200);
	MODULE_ON(); //for reset
	Delay_ms(200);

	RFXX_PORT_INIT();
	RFXX_WRT_CMD(0xCC00);
	RFXX_WRT_CMD(0x8B61); //+/-90kHz
	RFXX_WRT_CMD(0xA640); //434MHz
	RFXX_WRT_CMD(0xD040); //RATE/2
	RFXX_WRT_CMD(0xC823); //4,8kbps
	RFXX_WRT_CMD(0xC220); //Enable Bit Sync
	RFXX_WRT_CMD(0xC001); //Close all

	PORTB |= (1<<RFXX_DATA);
	DDRB |= (1<<RFXX_DATA); //Set Data Output

	while(1)
	{

	
		RFXX_WRT_CMD(0xC039); //Start TX
		ChkSum=0;

		RF02B_SEND(0xAA); //Preamble
		RF02B_SEND(0xAA); //Preamble
		RF02B_SEND(0xAA); //Preamble
		RF02B_SEND(0x2D); //Head Hi Byte
		RF02B_SEND(0xD4); //Head Low Byte

		RF02B_SEND(0x30); //Data0
		ChkSum+=0x30;
		RF02B_SEND(0x31); //Data1
		ChkSum+=0x31;
		RF02B_SEND(0x32); //Data2
		ChkSum+=0x32;
		RF02B_SEND(0x33); //Data3
		ChkSum+=0x33;
		RF02B_SEND(0x34); //Data4
		ChkSum+=0x34;
		RF02B_SEND(0x35); //Data5
		ChkSum+=0x35;
		RF02B_SEND(0x36); //Data6
		ChkSum+=0x36;
		RF02B_SEND(0x37); //Data7
		ChkSum+=0x37;
		RF02B_SEND(0x38); //Data8
		ChkSum+=0x38;
		RF02B_SEND(0x39); //Data9
		ChkSum+=0x39;
		RF02B_SEND(0x3A); //Data10
		ChkSum+=0x3A;
		RF02B_SEND(0x3B); //Data11
		ChkSum+=0x3B;
		RF02B_SEND(0x3C); //Data12
		ChkSum+=0x3C;
		RF02B_SEND(0x3D); //Data13
		ChkSum+=0x3D;
		RF02B_SEND(0x3E); //Data14
		ChkSum+=0x3E;
		RF02B_SEND(0x3F); //Data15
		ChkSum+=0x3F;
		LED2_ON();
	
		RF02B_SEND(ChkSum); //Data16
		RF02B_SEND(0xAA); //Dummy Byte)
		RFXX_WRT_CMD(0xC001); //Close TX

		LED2_ON();
		Delay_ms(200);
		LED2_OFF();
		Delay_ms(200);
		Delay_ms(200);
	

		for(i=0; i<5000; i++)
		for(j=0; j<123; j++);
	};
}