SPI之CC1101

 

SPI读写操作

INT8U SpiTxRxByte(INT8U dat)

{

   INT8U i,temp;

   temp = 0;

   SCK = 0;

   for(i=0; i<8; i++)

   {

      if(dat & 0x80)

      {

          MOSI = 1;

      }

      else MOSI = 0;

      dat <<= 1;

      SCK = 1;

      _nop_();

      _nop_();

      temp <<= 1;

      if(MISO)temp++;

      SCK = 0;

      _nop_();

      _nop_();  

   }

   return temp;

}

 

SPI写寄存器操作

void halSpiWriteReg(INT8U addr, INT8U value)

{

   CSN = 0;

   while (MISO);

   SpiTxRxByte(addr);     //写地址

   SpiTxRxByte(value);    //写入配置

   CSN = 1;

}

 

SPI读寄存器操作

INT8U halSpiReadReg(INT8U addr)

{

   INT8U temp, value;

   temp = addr|READ_SINGLE;//读寄存器命令

   CSN = 0;

   while (MISO);

   SpiTxRxByte(temp);

   value = SpiTxRxByte(0);

   CSN = 1;

   return value;

}

 

CC1101初始化设置

RF_SETTINGS rfSettings =

{

   0x00,

   0x08,  // FSCTRL1  Frequency synthesizer control.

   0x00,  // FSCTRL0  Frequency synthesizer control.

   0x10,  // FREQ2    Frequency control word, high byte.

   0xA7,  // FREQ1    Frequency control word, middle byte.

   0x62,  // FREQ0    Frequency control word, low byte.

   0x5B,  // MDMCFG4  Modem configuration.

   0xF8,  // MDMCFG3  Modem configuration.

   0x03,  // MDMCFG2  Modem configuration.

   0x22,  // MDMCFG1  Modem configuration.

   0xF8,  // MDMCFG0  Modem configuration.

   0x00,  // CHANNR   Channel number.

0x47,  // DEVIATN  Modem deviation setting

   0xB6,  // FREND1   Front end RX configuration.

   0x10,  // FREND0   Front end RX configuration.

   0x18,  // MCSM0    Main Radio Control State Machine configuration.

   0x1D,  // FOCCFG   Frequency Offset Compensation Configuration.

   0x1C,  // BSCFG    Bit synchronization Configuration.

   0xC7,  // AGCCTRL2 AGC control.

   0x00,  // AGCCTRL1 AGC control.

   0xB2,  // AGCCTRL0 AGC control.

   0xEA,  // FSCAL3   Frequency synthesizer calibration.

   0x2A,  // FSCAL2   Frequency synthesizer calibration.

   0x00,  // FSCAL1   Frequency synthesizer calibration.

   0x11,  // FSCAL0   Frequency synthesizer calibration.

   0x59,  // FSTEST   Frequency synthesizer calibration.

   0x81,  // TEST2    Various test settings.

   0x35,  // TEST1    Various test settings.

   0x09,  // TEST0    Various test settings.

   0x0B,  // IOCFG2   GDO2 output pin configuration.

0x06,  // IOCFG0D  GDO0 output pin configuration.

   0x04,  // PKTCTRL1 Packet automation control.

   0x05,  // PKTCTRL0 Packet automation control.

   0x00,  // ADDR     Device address.

   0x0c   // PKTLEN   Packet length.

};

 

数据接收流程操作

INT8U halRfReceivePacket(INT8U *rxBuffer, INT8U *length)

{

   INT8U status[2];

   INT8U packetLength;

   INT8U i=(*length)*4; //具体多少要根据datarate和length来决定

   halSpiStrobe(CCxxx0_SRX);     //进入接收状态

   delay(2);

   while (GDO0)

   {

      delay(2);

      --i;

      if(i<1)

        return 0;    

   }  

if ((halSpiReadStatus(CCxxx0_RXBYTES) & BYTES_IN_RXFIFO))

 //如果接的字节数不为0

   {

       packetLength = halSpiReadReg(CCxxx0_RXFIFO);

//读出第一个字节，此字节为该帧数据长度

       if (packetLength <= *length)    

//如果所要的有效数据长度小于等于接收到的数据包的长度

      {

halSpiReadBurstReg(CCxxx0_RXFIFO, rxBuffer, packetLength); //读出所有接收到的数据

           *length = packetLength;             

//把接收数据长度的修改为当前数据的长度

// Read the 2 appended status bytes (status[0] = RSSI, status[1] = LQI)

           halSpiReadBurstReg(CCxxx0_RXFIFO, status, 2); 

//读出CRC校验位

          halSpiStrobe(CCxxx0_SFRX);     //清洗接收缓冲区

           return (status[1] & CRC_OK); //如果校验成功返回接收成功

       }

       else

      {

           *length = packetLength;

           halSpiStrobe(CCxxx0_SFRX);   //清洗接收缓冲区

           return 0;

       }

   }

   else

   return 0;

}

 

数据发送流程操作

void halRfSendPacket(INT8U *txBuffer, INT8U size)

{

   halSpiWriteReg(CCxxx0_TXFIFO, size);

   halSpiWriteBurstReg(CCxxx0_TXFIFO, txBuffer, size);//写入要发送的数据

   halSpiStrobe(CCxxx0_STX);     //进入发送模式发送数据

   // Wait for GDO0 to be set -> sync transmitted

   while (!GDO0);

   // Wait for GDO0 to be cleared -> end of packet

   while (GDO0);

      halSpiStrobe(CCxxx0_SFTX);

}