main_sdbc_dk3.c

Si4432-T-B1版本资料.rar

			//turn off the LED
			LED2 = 0; 	
		}		
		//if the PB3 button pressed, blink the LED3	
		if(PB3 == 0)
		{	
			//Wait for releasing the push button
			while( PB3 == 0 );
			//turn on the LED to show the packet transmission
			LED3 = 1; 																			
			/*SET THE CONTENT OF THE PACKET*/
			//set the length of the payload to 8bytes	
			SpiWriteRegister(0x3E, 8);													//write 8 to the Transmit Packet Length register		
			//fill the payload into the transmit FIFO
			SpiWriteRegister(0x7F, 0x42);												//write 0x42 ('B') to the FIFO Access register	
			SpiWriteRegister(0x7F, 0x55);												//write 0x55 ('U') to the FIFO Access register	
			SpiWriteRegister(0x7F, 0x54);												//write 0x54 ('T') to the FIFO Access register	
			SpiWriteRegister(0x7F, 0x54);												//write 0x54 ('T') to the FIFO Access register	
			SpiWriteRegister(0x7F, 0x4F);												//write 0x4F ('O') to the FIFO Access register	
			SpiWriteRegister(0x7F, 0x4E);												//write 0x4E ('N') to the FIFO Access register	
			SpiWriteRegister(0x7F, 0x33);												//write 0x33 ('3') to the FIFO Access register	
			SpiWriteRegister(0x7F, 0x0D);												//write 0x0D (CR) to the FIFO Access register	

			//Disable all other interrupts and enable the packet sent interrupt only.
			//This will be used for indicating the successfull packet transmission for the MCU
			SpiWriteRegister(0x05, 0x04);												//write 0x04 to the Interrupt Enable 1 register	
			SpiWriteRegister(0x06, 0x00);												//write 0x00 to the Interrupt Enable 2 register	
			//Read interrupt status regsiters. It clear all pending interrupts and the nIRQ pin goes back to high.
			ItStatus1 = SpiReadRegister(0x03);										//read the Interrupt Status1 register
			ItStatus2 = SpiReadRegister(0x04);										//read the Interrupt Status2 register

			/*enable transmitter*/
			//The radio forms the packet and send it automatically.
			SpiWriteRegister(0x07, 0x09);												//write 0x09 to the Operating Function Control 1 register

			/*wait for the packet sent interrupt*/
			//The MCU just needs to wait for the 'ipksent' interrupt.
			while(NIRQ == 1);
			//read interrupt status registers to release the interrupt flags
			ItStatus1 = SpiReadRegister(0x03);										//read the Interrupt Status1 register
			ItStatus2 = SpiReadRegister(0x04);										//read the Interrupt Status2 register

			//wait a bit for showing the LED a bit longer
			for(delay = 0; delay < 10000;delay++);
			//turn off the LED
			LED3 = 0; 	
		}	
		//if the PB4 button pressed, blink the LED4	
		if(PB4 == 0)
		{	
			//Wait for releasing the push button
			while( PB4 == 0 );
			//turn on the LED to show the packet transmission
			LED4 = 1; 																			
			/*SET THE CONTENT OF THE PACKET*/
			//set the length of the payload to 8bytes	
			SpiWriteRegister(0x3E, 8);													//write 8 to the Transmit Packet Length register		
			//fill the payload into the transmit FIFO
			SpiWriteRegister(0x7F, 0x42);												//write 0x42 ('B') to the FIFO Access register	
			SpiWriteRegister(0x7F, 0x55);												//write 0x55 ('U') to the FIFO Access register	
			SpiWriteRegister(0x7F, 0x54);												//write 0x54 ('T') to the FIFO Access register	
			SpiWriteRegister(0x7F, 0x54);												//write 0x54 ('T') to the FIFO Access register	
			SpiWriteRegister(0x7F, 0x4F);												//write 0x4F ('O') to the FIFO Access register	
			SpiWriteRegister(0x7F, 0x4E);												//write 0x4E ('N') to the FIFO Access register	
			SpiWriteRegister(0x7F, 0x34);												//write 0x34 ('4') to the FIFO Access register	
			SpiWriteRegister(0x7F, 0x0D);												//write 0x0D (CR) to the FIFO Access register	

			//Disable all other interrupts and enable the packet sent interrupt only.
			//This will be used for indicating the successfull packet transmission for the MCU
			SpiWriteRegister(0x05, 0x04);												//write 0x04 to the Interrupt Enable 1 register	
			SpiWriteRegister(0x06, 0x00);												//write 0x00 to the Interrupt Enable 2 register	
			//Read interrupt status regsiters. It clear all pending interrupts and the nIRQ pin goes back to high.
			ItStatus1 = SpiReadRegister(0x03);										//read the Interrupt Status1 register
			ItStatus2 = SpiReadRegister(0x04);										//read the Interrupt Status2 register

			/*enable transmitter*/
			//The radio forms the packet and send it automatically.
			SpiWriteRegister(0x07, 0x09);												//write 0x09 to the Operating Function Control 1 register

			/*wait for the packet sent interrupt*/
			//The MCU just needs to wait for the 'ipksent' interrupt.
			while(NIRQ == 1);
			//read interrupt status registers to release the interrupt flags
			ItStatus1 = SpiReadRegister(0x03);										//read the Interrupt Status1 register
			ItStatus2 = SpiReadRegister(0x04);										//read the Interrupt Status2 register

			//wait a bit for showing the LED a bit longer
			for(delay = 0; delay < 10000;delay++);
			//turn off the LED
			LED4 = 0; 	
		}			
	}
}

/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  +
  + FUNCTION NAME:  	void MCU_Init(void)
  +
  + DESCRIPTION:   	This function configures the MCU 
  + 						P0.0  -  skipped, PB0
  + 						P0.1  -  skipped  PB1
  + 						P0.2  -  skipped, analog input, XTAL
  + 						P0.3  -  skipped, analog input, XTAL
  + 						P0.4  -  UART TX, push-pull output
  + 						P0.5  -  UART RX, open drain input
  + 						P0.6  -  skipped
  + 						P0.7  -  skipped
  +
  + 						P1.0  -  SCK  (SPI1), Push-Pull,  Digital
  + 						P1.1  -  MISO (SPI1), Open-Drain, Digital
  + 						P1.2  -  MOSI (SPI1), Push-Pull,  Digital
  + 						P1.3  -  NSS, Push-Pull,  Digital
  + 						P1.4  -  skipped LED1 
  + 						P1.5  -  skipped LED
  + 						P1.6  -  skipped LED
  + 						P1.7  -  skipped LED
  +	
  + 						P2.0  -  skipped, PB3
  + 						P2.1  -  skipped  PB4
  +
  + INPUT:			  None
  +
  + RETURN:         None
  +
  + NOTES:          None
  +
  +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
void MCU_Init(void)
{
	//Disable the Watch Dog timer of the MCU
  	PCA0MD   &= ~0x40;                  
	
	// Set the clock source of the MCU: 10MHz, using the internal RC osc.
  	CLKSEL    = 0x14;

  	// Initialize the the IO ports and the cross bar
  	P0SKIP  |= 0xCF;                    // skip P0.0-3 & 0.6-7
  	XBR1    |= 0x40;                    // Enable SPI1 (3 wire mode)
  	P1MDOUT |= 0x01;                    // Enable SCK push pull
  	P1MDOUT |= 0x04;                    // Enable MOSI push pull
  	P1SKIP  |= 0x08;                    // skip NSS
  	P1MDOUT |= 0x08;                    // Enable NSS push pull
  	P1SKIP  |= 0xF0;                    // skip LEDs
  	P1MDOUT |= 0xF0;                    // Enable LEDS push pull
  	P2SKIP  |= 0x03;                    // skip PB3 & 4
	P2 = 0x03;
  	SFRPAGE = CONFIG_PAGE;
  	P1DRV   = 0xFD;		               // MOSI, SCK, NSS, LEDs high current mode
  	SFRPAGE = LEGACY_PAGE;
  	XBR2    |= 0x40;                    // enable Crossbar

   // For the SPI communication the hardware peripheral of the MCU is used 
   // in 3 wires Single Master Mode. The select pin of the radio is controlled
	// from software
	SPI1CFG   = 0x40;							// Master SPI, CKPHA=0, CKPOL=0
   SPI1CN    = 0x00;							// 3-wire Single Master, SPI enabled
  	SPI1CKR   = 0x00;
  	SPI1EN 	 = 1; 	                 	// Enable SPI interrupt
  	NSS = 1;

	// Turn off the LEDs
   LED1 = 0;
   LED2 = 0;
   LED3 = 0;
   LED4 = 0;
}

/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  +
  + FUNCTION NAME: void SpiWriteRegister(U8 reg, U8 value)
  +
  + DESCRIPTION:   This function writes the registers 
  + 					
  + INPUT:			 U8 reg - register address   
  +					 U8 value - value write to register	
  +
  + RETURN:        None
  +
  + NOTES:         Write uses a Double buffered transfer
  +
  +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
void SpiWriteRegister (U8 reg, U8 value)
{
   // Send SPI data using double buffered write

	//Select the radio by pulling the nSEL pin to low
   NSS = 0;                            
   
	//write the address of the register into the SPI buffer of the MCU
	//(important to set the MSB bit)
	SPI1DAT = (reg|0x80);				//write data into the SPI register
	//wait until the MCU finishes sending the byte
	while( SPIF1 == 0);					
	SPIF1 = 0;
	//write the new value of the radio register into the SPI buffer of the MCU
	SPI1DAT = value;						//write data into the SPI register
	//wait until the MCU finishes sending the byte
	while( SPIF1 == 0);					//wait for sending the data
	SPIF1 = 0;	       
   //Deselect the radio by pulling high the nSEL pin
	NSS = 1;                            

}

/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  +
  + FUNCTION NAME: U8 SpiReadRegister(U8 reg)
  +
  + DESCRIPTION:   This function reads the registers 
  + 					
  + INPUT:			 U8 reg - register address   
  +
  + RETURN:        SPI1DAT - the register content 
  +
  + NOTES:         none
  +
  +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
U8 SpiReadRegister (U8 reg)
{

	//Select the radio by pulling the nSEL pin to low
	NSS = 0;                            
	//Write the address of the register into the SPI buffer of the MCU 
	//(important to clear the MSB bit)
   SPI1DAT = reg;								//write data into the SPI register
	//Wait untill the MCU finishes sending the byte
	while( SPIF1 == 0);						
	SPIF1 = 0;
	//Write a dummy data byte into the SPI buffer of the MCU. During sending 
	//this byte the MCU will read the value of the radio register and save it 
	//in its SPI buffer.
	SPI1DAT = 0xFF;							//write dummy data into the SPI register
	//Wait untill the MCU finishes sending the byte
	while( SPIF1 == 0);						
	SPIF1 = 0;
	//Deselect the radio by pulling high the nSEL pin
	NSS = 1;                            

	//Read the received radio register value and return with it
   return SPI1DAT;
}