www.pudn.com > CC2420_TRX.rar > basic_rf_init._c

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 *      ***   +++   ***                                                                                * 
 *      ***   + +   ***                                                                                * 
 *      ***   +                               CHIPCON CC2420 BASIC RF LIBRARY                          * 
 *      ***   + +   ***                                Initilization                                   * 
 *      ***   +++   ***                                                                                * 
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 * This file contains the basic RF initialization function.                                            * 
 *                                                                                                     * 
 * More information can be found in basic_rf.h                                                         * 
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 * Compiler: AVR-GCC                                                                                   * 
 * Target platform: CC2420DB, CC2420 + any MCU with very few modifications required                    * 
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 * Revision history:                                                                                   * 
 * $Log: basic_rf_init.c,v $ 
 * Revision 1.4  2004/07/26 11:28:09  mbr 
 * Modified RXFIFO flushing by strobing CC2420_SFLUSHRX 
 * 
 * Revision 1.3  2004/03/30 14:59:22  mbr 
 * Release for web 
 *  
 * 
 * 
 *******************************************************************************************************/ 
#include  
 
 
//------------------------------------------------------------------------------------------------------- 
// The RF settings structure is declared here, since we'll always need halRfInit() 
volatile BASIC_RF_SETTINGS rfSettings; 
//------------------------------------------------------------------------------------------------------- 
 
 
 
 
//------------------------------------------------------------------------------------------------------- 
//  void basicRfInit(BASIC_RF_RX_INFO *pRRI, UINT8 channel, WORD panId, WORD myAddr) 
// 
//  DESCRIPTION: 
//      Initializes CC2420 for radio communication via the basic RF library functions. Turns on the 
//		voltage regulator, resets the CC2420, turns on the crystal oscillator, writes all necessary 
//		registers and protocol addresses (for automatic address recognition). Note that the crystal 
//		oscillator will remain on (forever). 
// 
//  ARGUMENTS: 
//      BASIC_RF_RX_INFO *pRRI 
//          A pointer the BASIC_RF_RX_INFO data structure to be used during the first packet reception. 
//			The structure can be switched upon packet reception. 
//      UINT8 channel 
//          The RF channel to be used (11 = 2405 MHz to 26 = 2480 MHz) 
//      WORD panId 
//          The personal area network identification number 
//      WORD myAddr 
//          The 16-bit short address which is used by this node. Must together with the PAN ID form a 
//			unique 32-bit identifier to avoid addressing conflicts. Normally, in a 802.15.4 network, the 
//			short address will be given to associated nodes by the PAN coordinator. 
//------------------------------------------------------------------------------------------------------- 
void basicRfInit(BASIC_RF_RX_INFO *pRRI, UINT8 channel, WORD panId, WORD myAddr) { 
    UINT8 n; 
 
    // Make sure that the voltage regulator is on, and that the reset pin is inactive 
    SET_VREG_ACTIVE(); 
    halWait(1000); 
    SET_RESET_ACTIVE(); 
    halWait(1); 
    SET_RESET_INACTIVE(); 
    halWait(5); 
 
    // Initialize the FIFOP external interrupt 
     FIFOP_INT_INIT(); 
	 ENABLE_FIFOP_INT(); 
  
 
    // Turn off all interrupts while we're accessing the CC2420 registers 
	DISABLE_GLOBAL_INT(); 
 
 
    // Register modifications 
    FASTSPI_STROBE(CC2420_SXOSCON); 
    FASTSPI_SETREG(CC2420_MDMCTRL0, 0x02F2); // Turn on automatic packet acknowledgment 
	FASTSPI_SETREG(CC2420_MDMCTRL1, 0x0500); // Set the correlation threshold = 20 
    FASTSPI_SETREG(CC2420_IOCFG0, 0x007F);   // Set the FIFOP threshold to maximum 
    FASTSPI_SETREG(CC2420_SECCTRL0, 0x01C4); // Turn off "Security enable" 
     
	// Set the RF channel 
    halRfSetChannel(channel); 
 
    // Turn interrupts back on 
	ENABLE_GLOBAL_INT(); 
 
	// Set the protocol configuration 
	rfSettings.pRxInfo = pRRI; 
	rfSettings.panId = panId; 
	rfSettings.myAddr = myAddr; 
	rfSettings.txSeqNumber = 0; 
    rfSettings.receiveOn = FALSE; 
	 
	// Wait for the crystal oscillator to become stable 
    halRfWaitForCrystalOscillator(); 
	 
	// Write the short address and the PAN ID to the CC2420 RAM (requires that the XOSC is on and stable) 
   	DISABLE_GLOBAL_INT(); 
    FASTSPI_WRITE_RAM_LE(&myAddr, CC2420RAM_SHORTADDR, 2, n); 
    FASTSPI_WRITE_RAM_LE(&panId, CC2420RAM_PANID, 2, n); 
  	ENABLE_GLOBAL_INT(); 
 
} // basicRfInit