/*    mija 2008
      demo for RFM02 - TX 868MHz

	  CPU ATMEGA16
      fcpu = 1MHz

	  !! define PIN,PORT,DDR for IOpin !!

	  tested with module RFM12B RX 9600 BW 134kHz 
*/

#define F_CPU 1000000UL

#include <avr/io.h>
#include <util/delay.h>
#include "RFM02.h"

//************************************************************************

#define SDI    		PB3
 #define SDI_PORT	PORTB
 #define SDI_DDR	DDRB

#define FSK    		PC1
 #define FSK_PORT	PORTC
 #define FSK_DDR	DDRC

#define SCK    		PB5
 #define SCK_PORT	PORTB
 #define SCK_DDR	DDRB

#define nIRQ   		PD2      // input for mega
 #define nIRQ_PORT	PORTD
 #define nIRQ_DDR	DDRD
 #define nIRQ_PIN	PIND

#define nSEL   		PB2
 #define nSEL_PORT	PORTB
 #define nSEL_DDR	DDRB

#define LED   		PC3
 #define LED_PORT	PORTC
 #define LED_DDR	DDRC

// interni
#define SDI_H		SDI_PORT |= _BV(SDI)
#define SDI_L		SDI_PORT &= (~(_BV(SDI)))
#define SDI_INIT	SDI_DDR |= _BV(SDI)

#define FSK_H		FSK_PORT |= _BV(FSK)
#define FSK_L		FSK_PORT &= (~(_BV(FSK)))
#define FSK_INIT	FSK_DDR |= _BV(FSK)

#define SDO_INPUT	(SDO_PIN & _BV(SDO))
#define SDO_INIT	SDO_DDR &= (~(_BV(SDO)))

#define SCK_H		SCK_PORT |= _BV(SCK)
#define SCK_L		SCK_PORT &= (~(_BV(SCK)))
#define SCK_INIT	SCK_DDR |= _BV(SCK)

#define nIRQ_INPUT	(nIRQ_PIN & _BV(nIRQ))
#define nIRQ_INIT	nIRQ_DDR &= (~(_BV(nIRQ)))

#define nSEL_H		nSEL_PORT |= _BV(nSEL)
#define nSEL_L		nSEL_PORT &= (~(_BV(nSEL)))
#define nSEL_INIT	nSEL_DDR |= _BV(nSEL)

#define LED_H		LED_PORT |= _BV(LED)
#define LED_L		LED_PORT &= (~(_BV(LED)))
#define LED_INIT	LED_DDR |= _BV(LED)

#define START_TX	RF_WRITE_CMD(CMD_POWER|POWER_EX|POWER_ES|POWER_EA|POWER_DC)
#define STOP_TX		RF_WRITE_CMD(CMD_POWER|POWER_DC)

//************************************************************************

//uint8_t test[16]={0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x03b,0x3c,0x3d,0x3e,0x3f};
uint8_t test[17]="\n\rATmega16\n\r ---";
//uint8_t test[16]="0123456789abcdef";


//************************************************************************

void delay_ms(uint16_t time)
{
	while(time--) _delay_ms(1);
}

void IO_INIT(void)
{
	SDI_INIT;
	SCK_INIT;
	nIRQ_INIT;
	nSEL_INIT;
	FSK_INIT;
	LED_INIT;
}

void RF_INIT(void)
{
   nSEL_H;
   SDI_H;
   SCK_L;
   nIRQ_INPUT;
   FSK_H;
}

void RF_WRITE_CMD(uint16_t cmd)
{
   uint8_t i;

   SCK_L;
   nSEL_L;
   for (i=0;i<16;i++)
   {
      SCK_L;
	  SCK_L;
      if (cmd & 0x8000) SDI_H;
      else SDI_L;
	  SCK_H;
      SCK_H;
      cmd <<= 1;
   }
   SCK_L;
   nSEL_H;
}

void RF_WRITE_DATA(uint8_t data)
{
	uint8_t i;
	
	for (i=0;i<8;i++)
   	{
    	while (nIRQ_INPUT);
      	while (!nIRQ_INPUT);
      	if (data & 0x80)FSK_H;
      	else FSK_L;
      	data <<= 1;
   	}
}

int main()
{
	uint8_t i,j,ChkSum;

	IO_INIT();
	RF_INIT();
	LED_H;
	delay_ms(100);

	RF_WRITE_CMD(CMD_STATUS);
	RF_WRITE_CMD(CMD_SETTING	|BAND_868	|C_12pF	|TX_DEV_90);
	RF_WRITE_CMD(CMD_FREQUENCY	|FREQUENCY_868);
	RF_WRITE_CMD(0xD040);
	RF_WRITE_CMD(CMD_RATE		|RATE_9600);
	RF_WRITE_CMD(CMD_BATTERY	|TX_EBS);
	RF_WRITE_CMD(CMD_POWER		|POWER_DC);
	RF_WRITE_CMD(POWER_OUT_0);

	j= 0;
   	while (1)
   	{
   		LED_H;

	  	START_TX;
      	ChkSum = 0;
      	for (i=0;i<3;i++) RF_WRITE_DATA(0xAA);	
      	RF_WRITE_DATA(0x2D);
      	RF_WRITE_DATA(0xD4);
      
      	for (i=0;i<16;i++)
      	{
        	RF_WRITE_DATA(test[i]);
         	ChkSum += test[i];
      	}
      	RF_WRITE_DATA(ChkSum);
      	RF_WRITE_DATA(0xAA);
	RF_WRITE_DATA(0xAA);
      	STOP_TX;

	  	LED_L;
      	delay_ms(500);
	  	j++;
      	test[13]=(j/100)+0x30;
	  	test[14]=((j%100)/10)+0x30; 
	  	test[15]=((j%100)%10)+0x30;
	}
   	return 0;
}