CC2544 Vs CC2500

/*
 * CC2500.c
 *
 * Created: 09-Nov-14 6:08:16 PM
 *  Author: dinu
 */ 
#define F_CPU 8000000UL

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

#define CSn PC3
#define MOSI PB3
#define SCLK PB5
#define SS PB2

//assign values to the registers
#define CC_IOCFG2_value 0x2F
#define CC_IOCFG1_value 0x2E
#define CC_IOCFG0D_value              0x06
#define CC_FIFOTHR_value              0x07
#define CC_SYNC1_value 0xD3
#define CC_SYNC0_value 0x91
#define CC_PKTLEN_value 0x03
#define CC_PKTCTRL1_value              0x84
#define CC_PKTCTRL0_value              0x04
#define CC_ADDR_value 0x00
#define CC_CHANNR_value 0x00
#define CC_FSCTRL1_value              0x09
#define CC_FSCTRL0_value              0x00
#define CC_FREQ2_value 0x5D
#define CC_FREQ1_value 0xD8
#define CC_FREQ0_value 0x9D
#define CC_MDMCFG4_value              0x2D
#define CC_MDMCFG3_value             0x3B
#define CC_MDMCFG2_value             0x73
#define CC_MDMCFG1_value             0x23
#define CC_MDMCFG0_value             0x3B
#define CC_DEVIATN_value              0x01
#define CC_MCSM2_value 0x07
#define CC_MCSM1_value                0x30
#define CC_MCSM0_value                 0x18
#define CC_FOCCFG_value 0x1D
#define CC_BSCFG_value 0x1C
#define CC_AGCCTRL2_value               0xC7
#define CC_AGCCTRL1_value              0x00
#define CC_AGCCTRL0_value              0xB2
#define CC_WOREVT1_value              0x87
#define CC_WOREVT0_value              0x6B
#define CC_WORCTRL_value              0xF8
#define CC_FREND1_value              0xB6
#define CC_FREND0_value 0x10
#define CC_FSCAL3_value 0xEA
#define CC_FSCAL2_value 0x0A
#define CC_FSCAL1_value 0x00
#define CC_FSCAL0_value 0x11
#define CC_RCCTRL1_value              0x41
#define CC_RCCTRL0_value              0x00
#define CC_FSTEST_value 0x59
#define CC_PTEST_value 0x7F
#define CC_AGCTEST_value              0x3F
#define CC_TEST2_value 0x88
#define CC_TEST1_value 0x31
#define CC_TEST0_value 0x0B
#define SRES                  0x30
#define SFSTXON   0x31
#define SXOFF     0x32
#define SCAL                  0x33
#define SRX                    0x34
#define STX                   0x35
#define SIDLE                0x36
#define SAFC                 0x37
#define SWOR     0x38
#define SPWD     0x39
#define SFRX                 0x3A
#define SFTX                  0x3B
#define SWORRST   0x3C
#define SNOP     0x3D
void SPI_init(); //initialize spi interface of atmega8
unsigned char SPI_TX(unsigned char); //transmit one byte from avr to CC
//creating array for assigned register values
const unsigned char CC_rfSettings[0x2F]=
{
	CC_IOCFG2_value,
	CC_IOCFG1_value,
	CC_IOCFG0D_value,
	CC_FIFOTHR_value,
	CC_SYNC1_value,
	CC_SYNC0_value,
	CC_PKTLEN_value,
	CC_PKTCTRL1_value,
	CC_PKTCTRL0_value,
	CC_ADDR_value,
	CC_CHANNR_value,
	CC_FSCTRL1_value,
	CC_FSCTRL0_value,
	CC_FREQ2_value,
	CC_FREQ1_value,
	CC_FREQ0_value,
	CC_MDMCFG4_value,
	CC_MDMCFG3_value,
	CC_MDMCFG2_value,
	CC_MDMCFG1_value,
	CC_MDMCFG0_value,
	CC_DEVIATN_value,
	CC_MCSM2_value,
	CC_MCSM1_value,
	CC_MCSM0_value,
	CC_FOCCFG_value,
	CC_BSCFG_value,
	CC_AGCCTRL2_value,
	CC_AGCCTRL1_value,
	CC_AGCCTRL0_value,
	CC_WOREVT1_value,
	CC_WOREVT0_value,
	CC_WORCTRL_value,
	CC_FREND1_value,
	CC_FREND0_value,
	CC_FSCAL3_value,
	CC_FSCAL2_value,
	CC_FSCAL1_value,
	CC_FSCAL0_value,
	CC_RCCTRL1_value,
	CC_RCCTRL0_value,
	CC_FSTEST_value,
	CC_PTEST_value,
	CC_AGCTEST_value,
	CC_TEST2_value,
	CC_TEST1_value,
	CC_TEST0_value
};

void command(unsigned char a) // give commands to CC
{
	PORTC=(0<<CSn);
	while(bit_is_set(PINB,PB4));
	SPI_TX(a);
	PORTC|=(1<<CSn);
}

unsigned char p,q,r,t;
void send()  // send data in CC wirelessly
{
	command(SFTX);      //flush tx FIFO
	command(SIDLE);    //turn CC2500 into idle mode
	
	command(SCAL);
	PORTC=(0<<CSn);
	while(bit_is_set(PINB,PB4));
	SPI_TX(0x7F);    // tx FIFO address in burst mode
	SPI_TX(0x55); // data byte1
	SPI_TX(0xAA); // data byte2
	SPI_TX(PIND);//data byte3
	PORTC|=(1<<CSn);
	command(STX);  //command to send data in tx FIFO wirelessly
	_delay_us(10);
}

//receive data wirelessly with CC
void receive()
{
	command(SRX); // command to receive data wirelessly
	command(SRX);
	while(bit_is_clear(PINC,PC1)); // check GD0pin of CC2500
	PORTC=(0<<CSn);
	while(bit_is_set(PINB,PB4));
	SPI_TX(0xFF); // rx FIFO address burst mode
	p=SPI_TX(0x00); // data byte1
	q=SPI_TX(0x00);// data byte2
	r=SPI_TX(0x00);// data byte3
	PORTC|=(1<<CSn);
	command(SFRX); // flush receiver FIFO
	command(SIDLE); // turn CC2500 into idle mode
	command(SCAL);
	PORTD=r;
}

int main()
{
	unsigned int j;
	unsigned char i,b;
	_delay_ms(5);
	SPI_init();
	PORTC|=(1<<CSn);
	for(i=0x00;i<0x2F;i++)   // configure registers of CC2500
	{
		PORTC=(0<<CSn);
		while(bit_is_set(PINB,PB4));
		SPI_TX(i); //address byte
		SPI_TX(CC_rfSettings[i]);// data byte
		PORTC|=(1<<CSn);
	}
	while(1)
	{
		//use send()in transmitter and receive() in receiver
		send();
		//receive();
	}
}
void SPI_init() //SPI initialization in atmega8
{
	DDRD=0xff;
	PORTD=0x00;
	DDRC|=(1<<CSn)|(0<<PC1)|(1<<PC5);
	DDRB=(1<<MOSI)|(1<<SCLK)|(1<<SS); // set MISO as output pin, rest as input
	SPCR=(1<<SPE)|(1<<MSTR)|(1<<SPR0); // Enable SPI
}
unsigned char SPI_TX(unsigned char a)  // atmega 8 send one byte to CC and receive one byte from CC
{
	SPDR=a;
	while(!(SPSR &(1<<SPIF))); //wait until SPIF get high
	return SPDR;
}