#include <avr/io.h>
#include ".\avr\interrupt.h"
#include "lcd_h.h"

/* makra pro praci s SPI rozhrani */
#define SCK 7 				/*SPI clock*/
#define SDO 5 				/*SPI data vystup*/
#define SDI 6 				/*SPI data vstup*/
#define CS 4 				/*SPI chip select*/
#define NIRQ 2 

/* vstupne-vystupni rizeni */
#define HI(x) PORTB |= (1<<(x))			/*nastaveni bitu x portu B do log. urovne 1*/
#define LO(x) PORTB &= ~(1<<(x))		/*nastaveni bitu x portu B do log. urovne 0*/
#define WAIT_NIRQ_LOW() while(PIND&(1<<NIRQ))	/*kontrola preruseni na INT0*/

/* LED */
#define LED 6
#define LED_ON() PORTD &= ~(1<<LED)		/*rozsviceni LED na bitu 6 portu D pomoci log. urovne 0*/
#define LED_OFF() PORTD |= (1<<LED)		/*zhasnuti LED na bitu 6 portu D pomoci log. urovne 1*/

#define BAUDRATE 25  				/*Baud rate 19200 at 8MHz*/

/*inicalizace RS232*/
void rsInit(unsigned char baud) {
UBRRL = baud;					/*nastaveni Baud rate dle zadane baud*/
UCSRC = (1<<UCSZ0) | (1<<UCSZ1); 		/*nastaveni formatu 8bitu data, 1 stop bit*/
UCSRB = (1<<RXEN) | (1<<TXEN); 			/*povoleni vysilani i prijimani*/	
}

/*zaslani dat po RS232*/
void rsSend(unsigned char data) {
while( !(UCSRA & (1<<UDRE)));
UDR = data;					/*ulozeni dat do vysilaciho registru RS232*/
}

/*cteni dat z RS232*/
unsigned char rsRecv() {
while( !(UCSRA & (1<<RXC)));
return UDR;					/*vycteni dat z prijimaciho registru RS232*/
}

/* standardni inicializace portu pro SPI */
void portInit() {
HI(CS);
HI(SDI);
LO(SCK);
DDRB = (1<<CS) | (1<<SDI) | (1<<SCK);
DDRD = (1<<LED);
}

/* SPI posilani 16-bitoveho cmd */
unsigned int writeCmd(unsigned int cmd) {
unsigned char i;
unsigned int recv;
recv = 0;
LO(SCK);					/*CLK v urovni low*/
LO(CS);						/*CHIP SELECT v urovni low = aktivace obvodu prijimace na SPI*/
for(i=0; i<16; i++) {				/*smycka pro zasilani 16-bit dat*/
if(cmd&0x8000) HI(SDI); else LO(SDI);
HI(SCK);					/*CLK v urvni high = puls hodin*/
recv<<=1;
if( PINB&(1<<SDO) ) {
recv|=0x0001;
}
LO(SCK);					/*CLK v urovni low = ukonceni pulsu*/
cmd<<=1;					/*posuv na dalsi bit dat*/
}
HI(CS);						/*CHIP SELECT v urovni high = deaktivace obvodu prijimace na SPI - ukonceni komunikace*/
return recv;
}

/*inicializace modulu vysilace dle manualu*/
void rfInit() 
{
writeCmd(0x80E7); //EL,EF,868band,12.0pF
writeCmd(0x8299); //er,!ebb,ET,ES,EX,!eb,!ew,DC (bug was here)
writeCmd(0xA640); //freq select
writeCmd(0xC647); //4.8kbps
writeCmd(0x94A0); //VDI,FAST,134kHz,0dBm,-103dBm
writeCmd(0xC2AC); //AL,!ml,DIG,DQD4
writeCmd(0xCA81); //FIFO8,SYNC,!ff,DR (FIFO level = 8)
writeCmd(0xCED4); //SYNC=2DD4;
writeCmd(0xC483); //@PWR,NO RSTRIC,!st,!fi,OE,EN
writeCmd(0x9850); //!mp,90kHz,MAX OUT
writeCmd(0xCC17); //!OB1,!OB0, LPX,!ddy,DDIT,BW0
writeCmd(0xE000); //NOT USE
writeCmd(0xC800); //NOT USE
writeCmd(0xC040); //1.66MHz,2.2V
}

/*prijimani dat prijimacem*/
unsigned char rfRecv() 
{
unsigned int data;
	while(1)
		{
		data = writeCmd(0x0000);		/*vycteni status registru prijimace*/
		if ( (data&0x8000) )			/*kontrola nastaveni MSB status registru*/
			{
			data = writeCmd(0xB000);	/*vycteni dat z fifo*/
			return (data&0x00FF);		
			}
		}
}

/*reset FIFO zasobniku prijimace dle Datasheetu*/
void FIFOReset() 
{
	writeCmd(0xCA81);
	writeCmd(0xCA83);
}

int main(void)
{
unsigned char data, i;
char lcd_vystup[16];
portInit();
rfInit();					/*inicializace SPI*/
rsInit(BAUDRATE);				/*inicializace RS232*/
FIFOReset();					/*reset FIFO zasobniku prijimace*/
lcd_init();					/*inicializace displeje*/
lcd_clrscr();					/*vymazani displeje*/

while(1) {
//waitForData();
LED_ON();					/*rozsviceni LED*/
for (i=0; i<16; i++)				/*vycteni prijatych dat polling metodou*/
	{
	data = rfRecv();
    sprintf(lcd_vystup,"%d",data);		/*formatovani pro displej*/
	lcd_puts(lcd_vystup);			/*vypis na displej*/
	LED_OFF();				/*zhasnuti LED*/
	//rsSend(data);
	}
	
FIFOReset();					/*reset FIFO zasobniku prijimace*/

}
return 0;
}