/*    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 
*/

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

#define F_CPU 1000000UL

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

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

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

#define SDO             PB4             // input for mega
 #define SDO_PORT       PORTB
 #define SDO_DDR        DDRB
 #define SDO_PIN        PINB

#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;
        SDO_INIT;
        SCK_INIT;
        nIRQ_INIT;
        nSEL_INIT;
        FSK_INIT;
        LED_INIT;
}

void RF_INIT(void)
{
   nSEL_H;
   SDI_H;
   SCK_L;
   nIRQ_INPUT;
   SDO_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_19200);
        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;
}