main_ezlink.c

Si4432-T-B1版本资料.rar

/*
** ============================================================================
**
** FILE
**  main.c
**
** DESCRIPTION
**  This is the main file of the project.	    
**  HW platform EZLink module with C8051F93x Silabs MCU 
**
** CREATED
**  Silicon Laboratories Hungary Ltd
**
** COPYRIGHT
**  Copyright 2009 Silicon Laboratories, Inc.  
**	http://www.silabs.com
**
** ============================================================================
*/


								/* ======================================================== *
								 *									INCLUDE									*
							 	 * ======================================================== */


#include "C8051F930_defs.h"
#include "compiler_defs.h"
#include <string.h>

							/* ================================================================ *
							 * C8051F930 Pin definitions for EZLink	platform			   	     *
							 * 					(using compiler_def.h macros) 						  *
							 *	================================================================ */	

SBIT (NSS, SFR_P1, 3);
SBIT (NIRQ, SFR_P0, 6);
SBIT (SDN, SFR_P0, 1);
SBIT (RX_LED, SFR_P2, 0);      
SBIT (TX_LED, SFR_P1, 6);      
SBIT (PB,     SFR_P0, 7);       


								/* ======================================================== *
								 *							Function PROTOTYPES							* 
								 * ======================================================== */
//MCU initialization
void MCU_Init(void);
//SPI functions						
void SpiWriteRegister (U8, U8);
U8 SpiReadRegister (U8);

								/* ======================================================= *
								 *						GLOBAL VARIABLE	  			  				  *
							 	 * ======================================================= */


code U8 tx_packet[128] = 	{0,	1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
							 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
							 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
							 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
							 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
							 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
							 96, 97, 98, 99, 100,101, 102, 103,	104, 105, 106, 107,	108, 109, 110, 111,
							 112, 113, 114,	115, 116, 117, 118,	119, 120, 121, 122,	123, 124, 125, 126, 127};

xdata U8 rx_packet[128];

void main(void)
{
	U8 ItStatus1,ItStatus2;
	U16 delay;
	U8 length,temp8,pointer;

	//Initialize the MCU: 
	//	- set IO ports for the Software Development board
	//	- set MCU clock source
	//	- initialize the SPI port 
	//	- turn off LEDs
	MCU_Init();
							/* ======================================================== *
							 *						Initialize the Si443x ISM chip				* 
							 * ======================================================== */
	//Turn on the radio by pulling down the PWRDN pin
	SDN = 0;
	//Wait at least 15ms befory any initialization SPI commands are sent to the radio
	// (wait for the power on reset sequence) 
	for (temp8=0;temp8<15;temp8++)
	{
		for(delay=0;delay<10000;delay++);
	}	 
	//read interrupt status registers to clear the interrupt flags and release NIRQ pin
	ItStatus1 = SpiReadRegister(0x03);														//read the Interrupt Status1 register
	ItStatus2 = SpiReadRegister(0x04);														//read the Interrupt Status2 register

	//SW reset   
   SpiWriteRegister(0x07, 0x80);																//write 0x80 to the Operating & Function Control1 register 
	
	//wait for POR interrupt from the radio (while the nIRQ pin is high)
	while ( NIRQ == 1);  
	//read interrupt status registers to clear the interrupt flags and release NIRQ pin
	ItStatus1 = SpiReadRegister(0x03);														//read the Interrupt Status1 register
	ItStatus2 = SpiReadRegister(0x04);														//read the Interrupt Status2 register


	//wait for chip ready interrupt from the radio (while the nIRQ pin is high)
	while ( NIRQ == 1);  
	//read interrupt status registers to clear the interrupt flags and release NIRQ pin
	ItStatus1 = SpiReadRegister(0x03);														//read the Interrupt Status1 register
	ItStatus2 = SpiReadRegister(0x04);														//read the Interrupt Status2 register
						
							/*set the physical parameters*/
	//set the center frequency to 915 MHz
	SpiWriteRegister(0x75, 0x75);																//write 0x75 to the Frequency Band Select register             
	SpiWriteRegister(0x76, 0xBB);																//write 0xBB to the Nominal Carrier Frequency1 register
	SpiWriteRegister(0x77, 0x80);  															//write 0x80 to the Nominal Carrier Frequency0 register
	
	//set the desired TX data rate (9.6kbps)
	SpiWriteRegister(0x6E, 0x4E);																//write 0x4E to the TXDataRate 1 register
	SpiWriteRegister(0x6F, 0xA5);																//write 0xA5 to the TXDataRate 0 register
	SpiWriteRegister(0x70, 0x2C);																//write 0x2C to the Modulation Mode Control 1 register

	//set the TX power to MAX
	SpiWriteRegister(0x6D, 0x1F);																//write 0x1F to the TX Power register 

	//set the Tx deviation register (+-45kHz)
	SpiWriteRegister(0x72, 0x48);																//write 0x48 to the Frequency Deviation register 

							/*set the modem parameters according to the exel calculator(parameters: 9.6 kbps, deviation: 45 kHz, channel filter BW: 102.1 kHz*/
	SpiWriteRegister(0x1C, 0x1E);																//write 0x1E to the IF Filter Bandwidth register		
	SpiWriteRegister(0x20, 0xD0);																//write 0xD0 to the Clock Recovery Oversampling Ratio register		
	SpiWriteRegister(0x21, 0x00);																//write 0x00 to the Clock Recovery Offset 2 register		
	SpiWriteRegister(0x22, 0x9D);																//write 0x9D to the Clock Recovery Offset 1 register		
	SpiWriteRegister(0x23, 0x49);																//write 0x49 to the Clock Recovery Offset 0 register		
	SpiWriteRegister(0x24, 0x00);																//write 0x00 to the Clock Recovery Timing Loop Gain 1 register		
	SpiWriteRegister(0x25, 0x24);																//write 0x24 to the Clock Recovery Timing Loop Gain 0 register		
	SpiWriteRegister(0x1D, 0x40);																//write 0x40 to the AFC Loop Gearshift Override register		
	SpiWriteRegister(0x1E, 0x0A);																//write 0x0A to the AFC Timing Control register		
	SpiWriteRegister(0x2A, 0x20);																//write 0x20 to the AFC Limiter register		


							/*set the packet structure and the modulation type*/
	//set the preamble length to 5bytes 
	SpiWriteRegister(0x34, 0x0A);																//write 0x0A to the Preamble Length register
	//set preamble detection threshold to 20bits
	SpiWriteRegister(0x35, 0x2A); 															//write 0x2A to the Preamble Detection Control  register

	//Disable header bytes; set variable packet length (the length of the payload is defined by the
	//received packet length field of the packet); set the synch word to two bytes long
	SpiWriteRegister(0x33, 0x02);																//write 0x02 to the Header Control2 register    
	
	//Set the sync word pattern to 0x2DD4
	SpiWriteRegister(0x36, 0x2D);																//write 0x2D to the Sync Word 3 register
	SpiWriteRegister(0x37, 0xD4);																//write 0xD4 to the Sync Word 2 register

	//enable the TX & RX packet handler and CRC-16 (IBM) check
	SpiWriteRegister(0x30, 0x8D);																//write 0x8D to the Data Access Control register
	//Disable the receive header filters
   SpiWriteRegister(0x32, 0x00 );															//write 0x00 to the Header Control1 register            
	//enable FIFO mode and GFSK modulation	
	SpiWriteRegister(0x71, 0x63);																//write 0x63 to the Modulation Mode Control 2 register

	
	//set the TX FIFO almost empty threshold to 10 bytes
	SpiWriteRegister(0x7D, 0x0B);																//write 0x0B to the TX FIFO Control 2 register
	//set the RX FIFO almost full threshold to 54 bytes
	SpiWriteRegister(0x7E,0x36);	

											/*set the GPIO's according to the RF switch */
  	SpiWriteRegister(0x0C, 0x12);																//write 0x12 to the GPIO1 Configuration(set the TX state)
	SpiWriteRegister(0x0D, 0x15);																//write 0x15 to the GPIO2 Configuration(set the RX state) 

											/*set the non-default Si443x registers*/
	//set  cap. bank
	SpiWriteRegister(0x09, 0xD7);																//write 0xD7 to the Crystal Oscillator Load Capacitance register


	/*enable receiver chain*/
	SpiWriteRegister(0x07, 0x05);																//write 0x05 to the Operating Function Control 1 register
	//Enable three interrupts: 
	// a) one which shows that a valid packet received: 'ipkval'
	// b) second shows if the packet received with incorrect CRC: 'icrcerror'
	// c) third shows if the RX fifo almost full: 'irxffafull'  
	SpiWriteRegister(0x05, 0x13); 															//write 0x13 to the Interrupt Enable 1 register
	SpiWriteRegister(0x06, 0x00); 															//write 0x00 to the Interrupt Enable 2 register
	//read interrupt status registers to release all pending interrupts
	ItStatus1 = SpiReadRegister(0x03);														//read the Interrupt Status1 register
	ItStatus2 = SpiReadRegister(0x04);														//read the Interrupt Status2 register

	/*MAIN Loop*/
	while(1)
	{
		//Poll the port pins of the MCU to figure out whether the push button is pressed or not
		if(PB == 0)
		{	
			//Wait for releasing the push button
			while( PB == 0 );
			//disable the receiver chain (but keep the XTAL running to have shorter TX on time!)
			SpiWriteRegister(0x07, 0x01);														//write 0x01 to the Operating Function Control 1 register			

			//turn on the LED to show the packet transmission
			TX_LED = 1; 																			
			
			/*SET THE CONTENT OF THE PACKET*/
			//set the length of the payload to 8bytes	
			SpiWriteRegister(0x3E, 128);														//write 128 to the Transmit Packet Length register		
			
			//fill the payload into the transmit FIFO
			
			//write 64bytes into the FIFO			
			for(temp8=0;temp8<64;temp8++) 
			{
				SpiWriteRegister(0x7F,tx_packet[temp8]);	
			}

			//Disable all other interrupts and enable the FIFO almost empty interrupt only.
			SpiWriteRegister(0x05, 0x20);														//write 0x20 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 TX FIFO almost empty interrupt*/
			while(NIRQ == 1);			
	
		   //TX FIFO almost empty interrupt occured -->
		   //write the next 32bytes into the FIFO
			for(temp8=0;temp8<32;temp8++) 	
		   {
				SpiWriteRegister(0x7F,tx_packet[64+temp8]);		
			}
			//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
	
		   	/*Wait for TX FIFO almost empty interrupt*/
			while(NIRQ == 1);
    			
		   //TX FIFO almost empty interrupt occured -->
		   //write the last 32bytes into the FIFO
			for(temp8=0;temp8<32;temp8++) 	//copy the remain 32 byte to the FIFO