[菜农助学交流] 关于短距离、低功耗的无线通信技术---Zigbee

//打开VREG 使能复位 关闭全局中断 配置寄存器 等待晶振起震

void CC2420Init()

{

unsigned char cc2420Mes[]="cc2420 init is success\n\0";

unsigned char i;



// Make sure that the voltage regulator is on, and that the reset pin is inactive

SET_VREG_ACTIVE(); //open cc2420 power

Delay5ms(2);

SET_RESET_ACTIVE(); //enable reset

Delay5ms(10);

SET_RESET_INACTIVE(); //disable reset

Delay5ms(2);



// Turn off all interrupts while we're accessing the CC2420 registers

DISABLE_GLOBAL_INT();// close all int



// Register modifications

WriteStrobeReg_spi(CC2420_SXOSCON); //turn on xtal

WriteConfigReg_spi(CC2420_MDMCTRL0, 0x0AE2); // Turn off automatic packet acknowledgment

WriteConfigReg_spi(CC2420_MDMCTRL1, 0x0500); // Set the correlation threshold = 20

WriteConfigReg_spi(CC2420_IOCFG0, 0x007F); // Set the FIFOP threshold to maximum

WriteConfigReg_spi(CC2420_SECCTRL0, 0x01C4); // Turn off "Security enable"



// Wait for the crystal oscillator to become stable

do

{

i = WriteStrobeReg_spi(CC2420_SXOSCON); // 开启晶体振荡

DelayXms(100); 

}

while((i&0x40)==0);

Printf(cc2420Mes,23);

}

/******************************************************************************

* @fn cc2420Send

*

* @brief

* 设置Address函数

*

* Parameters:

*

* @param uint ShortAddress

*

* @return void

*

******************************************************************************/

void SetAddress(unsigned char Number,unsigned int PanID,unsigned int DestAddress,unsigned int MyAddress)

{

rfSettings.txSeqNumber=Number;

rfSettings.panId=PanID;

rfSettings.destAddr=DestAddress;

rfSettings.myAddr=MyAddress;

}

/******************************************************************************

* @fn cc2420Send

*

* @brief

* 发送数据

*

* Parameters:

*

* @param uint ShortAddress

*

* @return void

*

******************************************************************************/



void cc2420SendData(unsigned char ModeType)

{



unsigned char PackLenght,i;

unsigned int frameControlField;



// Wait until the transceiver is idle

while (FIFOP_IN|| SFD_IN);



// Turn off global interrupts to avoid interference on the SPI interface

DISABLE_GLOBAL_INT();



WriteStrobeReg_spi(CC2420_SFLUSHTX);

WriteStrobeReg_spi(CC2420_SFLUSHTX);



PackLenght=0; 



switch(ModeType)

{

case 0x01:

{

DataTxFIFO[PackLenght++]=PackLenght; //第一字节为帧长度，不包括长度域本身的字节，但包含帧校验序列2字节



//帧控制域,无安全，确认要求，数据帧，包含16位的目标地址，源地址，目标PAN标识符，源PAN标识符



frameControlField = CC2420_FCF_FRAMETYPE_DATA;

frameControlField |= 0 ? CC2420_FCF_ACK_REQUEST : CC2420_FCF_NO_ACK_REQUEST;

frameControlField |= CC2420_FCF_INTRAPAN;

frameControlField |= CC2420_FCF_DESTADDR_16BIT;

frameControlField |= CC2420_FCF_SOURCEADDR_16BIT;



DataTxFIFO[PackLenght++]=frameControlField >> 8; ; //高字节

DataTxFIFO[PackLenght++]=frameControlField & 0x00FF; //低字节



DataTxFIFO[PackLenght++]=rfSettings.txSeqNumber;; //Sequence number 



DataTxFIFO[PackLenght++]=rfSettings.panId >> 8;

DataTxFIFO[PackLenght++]=rfSettings.panId & 0x00FF; //目的PAN标识符



DataTxFIFO[PackLenght++]=rfSettings.destAddr >> 8;

DataTxFIFO[PackLenght++]=rfSettings.destAddr & 0x00FF; //目的地址



DataTxFIFO[PackLenght++]=rfSettings.myAddr >> 8;

DataTxFIFO[PackLenght++]=rfSettings.myAddr & 0x00FF; //源PAN标识符



for (; PackLenght < 20 ;PackLenght++) //有效负载

{

DataTxFIFO[PackLenght]=20;

}



PackLenght++; //CRC



DataTxFIFO[0]=PackLenght; 

break; 

}



case 0x02:

{

DataTxFIFO[PackLenght++]=PackLenght; //第一字节为帧长度，不包括长度域本身的字节，但包含帧校验序列2字节



//帧控制域,无安全，确认要求，数据帧，包含16位的目标地址，源地址，目标PAN标识符，源PAN标识符



frameControlField = CC2420_FCF_FRAMETYPE_DATA;

frameControlField |= 0 ? CC2420_FCF_ACK_REQUEST : CC2420_FCF_NO_ACK_REQUEST;

frameControlField |= CC2420_FCF_INTRAPAN;

frameControlField |= CC2420_FCF_DESTADDR_16BIT;

frameControlField |= CC2420_FCF_SOURCEADDR_64BIT;



DataTxFIFO[PackLenght++]=frameControlField >> 8; ; //高字节

DataTxFIFO[PackLenght++]=frameControlField & 0x00FF; //低字节



DataTxFIFO[PackLenght++]=rfSettings.txSeqNumber;; //Sequence number 



DataTxFIFO[PackLenght++]=rfSettings.panId >> 8;

DataTxFIFO[PackLenght++]=rfSettings.panId & 0x00FF; //目的PAN标识符



DataTxFIFO[PackLenght++]=rfSettings.destAddr >> 8;

DataTxFIFO[PackLenght++]=rfSettings.destAddr & 0x00FF; //目的地址



for( ; PackLenght < PackLenght + 8 ;PackLenght++) // Source address 

{

DataTxFIFO[PackLenght] = rfSettings.myIEEE[PackLenght-8]; 

}



for (; PackLenght < 20 ;PackLenght++) //有效负载

{

DataTxFIFO[PackLenght]=20;

}



PackLenght++; //CRC



DataTxFIFO[0]=PackLenght; 

break;

}

case 0x03:

{

DataTxFIFO[PackLenght++]=PackLenght; //第一字节为帧长度，不包括长度域本身的字节，但包含帧校验序列2字节



//帧控制域,无安全，确认要求，数据帧，包含16位的目标地址，源地址，目标PAN标识符，源PAN标识符



frameControlField = CC2420_FCF_FRAMETYPE_DATA;

frameControlField |= 1 ? CC2420_FCF_ACK_REQUEST : CC2420_FCF_NO_ACK_REQUEST;

frameControlField |= CC2420_FCF_INTRAPAN;

frameControlField |= CC2420_FCF_DESTADDR_64BIT;

frameControlField |= CC2420_FCF_SOURCEADDR_16BIT;



DataTxFIFO[PackLenght++]=frameControlField >> 8; ; //高字节

DataTxFIFO[PackLenght++]=frameControlField & 0x00FF; //低字节



DataTxFIFO[PackLenght++]=rfSettings.txSeqNumber;; //Sequence number 



DataTxFIFO[PackLenght++]=rfSettings.panId >> 8;

DataTxFIFO[PackLenght++]=rfSettings.panId & 0x00FF; //目的PAN标识符



for( ; PackLenght < PackLenght + 8 ;PackLenght++) //目的地址 

{

DataTxFIFO[PackLenght] = rfSettings.destIEEE[PackLenght-8]; 

}



DataTxFIFO[PackLenght++]=rfSettings.myAddr >> 8;

DataTxFIFO[PackLenght++]=rfSettings.myAddr & 0x00FF; //源PAN标识符



for (; PackLenght < 20 ;PackLenght++) //有效负载

{

DataTxFIFO[PackLenght]=20;

}



PackLenght++; //CRC



DataTxFIFO[0]=PackLenght;

break;

}

}

Write_TXFIFO(DataTxFIFO,PackLenght);



WriteStrobeReg_spi(CC2420_STXON);



while (!SFD_IN);

while (SFD_IN);



// Turn interrupts back on

ENABLE_GLOBAL_INT();





}