//Pins

/*
	IRQ - F0
	CE - F4
	CLK - A2
	CSN - A3
	MISO - A4
	MOSI - A5 

*/

void nrfstart(char mode);
void NRFwrite(uint8_t adress, uint8_t data);
uint8_t NRFread(uint8_t adress);
void TXflush();
void RXflush();
void TXwrite(uint8_t data);
int RXread();
void TXsend();
int ack();
int receive();

void transmitt(int data)
{
	//TXflush();
	//delayu(50);
	TXwrite(data);
	TXsend();
}

int receive()
{
	int data;

	if((GPIOF->DATA & 0x01) == 0x00){		//interrupção - pino IRQ
		
		data = RXread();
		
		GPIOF->DATA &= (~0x10);
		delayu(100);
		NRFwrite(0x27, 0x70);
		delayu(100);
		GPIOF->DATA |= (0x10);
	}
	else
	{
		data = -1;
	}

	return data;
}

void nrfstart(char mode)
{
	SPIstart(0,0,8);
	
	uint8_t teste = SYSCTL->RCGCGPIO;
	teste |= 0x20; 
	
	SYSCTL->RCGCGPIO |= 0x20;
	while(SYSCTL->RCGCGPIO != teste);
	
	GPIOF->LOCK = 0x4C4F434B;			//arrumar os pinos que serao utilizados
	GPIOF->CR |= 0x13;
	GPIOF->DIR |= 0x16;
	GPIOF->DEN |= 0x17;
	
	GPIOF->DATA &= (~0x10);
	GPIOA->DATA |= (0x08);
	delayu(5000);
	
	NRFwrite(0x21, 0x01);  //Enable autoacknowlegement para P0
	NRFwrite(0x22, 0x01);  //Enable data pipe 0
	NRFwrite(0x23, 0x03);  //5 bytes long address
	NRFwrite(0x24, 0x00);  //Setup of automatic retransmission - 1250us retransmit delay - Up to 15 re-transmissions
	NRFwrite(0x25, 0x4C);  //Channel frequency
	NRFwrite(0x26, 0x0E);	 //Setup register - 250kbps - 0dBm
	NRFwrite(0x27, 0x70);	 //Status register, cleaning the bits 6:4
	NRFwrite(0x31, 0x01);	 //Number of bytes in RX payload
	
	if(mode == 'r'){

		NRFwrite(0x20, 0x3F);  //Set receiver
	
	}

	else if(mode == 't'){

		NRFwrite(0x20, 0x5E);  //Set transmissor
	
	}
}

void NRFwrite(uint8_t adress, uint8_t data)
{
	SPIbegin();
	SPIwrite(adress);
	SPIwrite(data);
	SPIend();	
}

uint8_t NRFread(uint8_t adress)
{
	uint8_t retorno = SPIread(adress);
	return(retorno);	
}

void TXwrite(uint8_t data)
{
	SPIbegin();
	SPIwrite(0xA0);
	SPIwrite(data);
	SPIend();
}

int ack()
{
	int retorno = 0;
	
	if((GPIOF->DATA & 0x01) == 0x00){		//interrupção - pino IRQ
		
		retorno = 1;
		
	}
	
	return(retorno);	
}

int RXread()
{
	return(SPIread(0x61));
}

void TXflush()
{
	SPIwrite(0xE1);
}

void RXflush()
{
	SPIwrite(0xE2);
}

void TXsend()
{
	GPIOF->DATA |= 0x10;
	delayu(25);
	GPIOF->DATA &= (~0x10);
	delayu(25);
}