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CC2500L Board

Module works at 3.3V, if not concern the Low Energy mode, you can connect directly to 5V, but it is better to add some 1K resistor to drop to voltage, or use LDO regulator

Pin Definition, Size

Pin Header text Header text
1 GND GND (rectangle pad)
3 GDO0 other function pin
4 CSN SPI Enable
5 SCK SPI Clock
6 SO Data Out
7 SI Data In
8 GDO2 other function pin
9 RXEN Connect to VCC,
10 TXEN in RX mode, TXEN = 1, in TX mode, RXEN = 0

Electrical Characteristics

Name specification
operational current 14mA @ RX mode, 120mA @ TX mode
operational frequency 2400 – 2483 MHz ISM Band
Transmission power 16dbM
Sensitivity ‐110dBm (typical) @ 10Kbps mode 
modulation FSK /GFSK/MSK 
Tested Distance 1.5 KM
Module Size 33mm(L) x 17mm(W) x 5mm(H) 

CC2500 Arduino Demo Code

More Power expecification can refer to Data CC2500 documents

INT8U PaTabel[8] = {0xC0 ,0xC0 ,0xC0 ,0xC0 ,0xC0 ,0xC0 ,0xC0 ,0xC0};

SPI RW operation

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;
      temp <<= 1;
      SCK = 0;
   return temp;

SPI Write Register

void halSpiWriteReg(INT8U addr, INT8U value)
   CSN = 0;
   while (MISO);
   SpiTxRxByte(addr);     // Write address
   SpiTxRxByte(value);    // write data
   CSN = 1;

SPI Read register operation

INT8U halSpiReadReg(INT8U addr)
   INT8U temp, value;
   temp = addr|READ_SINGLE;//read register command
   CSN = 0;
   while (MISO);
   value = SpiTxRxByte(0);
   CSN = 1;
   return value;

CC2500 software reset

void RESET_CC2500(void)
   CSN = 0;
   while (MISO);
   SpiTxRxByte(CCxxx0_SRES);    //write register command
   while (MISO);
   CSN = 1;

CC2500 Initialization

const RF_SETTINGS rfSettings =
   0x07,  // FSCTRL1  Frequency synthesizer control.
   0x00,  // FSCTRL0  Frequency synthesizer control.
   0x5C,  // FREQ2    Frequency control word, high byte.
   0x58,  // FREQ1    Frequency control word, middle byte.
   0x9D,  // FREQ0    Frequency control word, low byte.
   0x0E,  // MDMCFG4  Modem configuration.
   0x3B,  // MDMCFG3  Modem configuration.
   0x73,  // MDMCFG2  Modem configuration.
   0x42,  // MDMCFG1  Modem configuration.
   0xF8,  // MDMCFG0  Modem configuration.
   0x00,  // CHANNR   Channel number.
 // DEVIATN  Modem deviation setting (when FSK modulation is enabled).
   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.
   0xCA,  // FSCAL3   Frequency synthesizer calibration.
   0x0A,  // FSCAL2   Frequency synthesizer calibration.
   0x00,  // FSCAL1   Frequency synthesizer calibration.
   0x11,  // FSCAL0   Frequency synthesizer calibration.
   0x59,  // FSTEST   Frequency synthesizer calibration.
   0x88,  // TEST2    Various test settings.
   0x31,  // TEST1    Various test settings.
   0x0B,  // TEST0    Various test settings.
   0x0B,  // IOCFG2   GDO2 output pin configuration.
0x06,  // IOCFG0D  GDO0 output pin configuration.
   0x05,  // PKTCTRL1 Packet automation control. //address detection 
0x45,  // PKTCTRL0 Packet automation control. 
//The variable length data packets through the first position after the sync word length of the configuration packet
   0x0A,    //the address used for filtering
   0xFF   // PKTLEN   Packet length.   Max

Data receive process

INT8U halRfReceivePacket(INT8U *rxBuffer, INT8U *length)
   INT8U status[2];
   INT8U packetLength;
   INT8U i=(*length)*4; //depends on datarate and length
   halSpiStrobe(CCxxx0_SRX);     // enter into receive mode
   while (GDO0)
        return 0;    
if ((halSpiReadStatus(CCxxx0_RXBYTES) & BYTES_IN_RXFIFO))
 //if the received data is not 0
       packetLength = halSpiReadReg(CCxxx0_RXFIFO);
//read first byte, this byte is the length of this data frame
       if (packetLength <= *length)    
//if the lengths of available data needed is less or equal to the received data packet length
halSpiReadBurstReg(CCxxx0_RXFIFO, rxBuffer, packetLength); //read all received data
           *length = packetLength;             
//set the received data length to current data length
// Read the 2 appended status bytes (status[0] = RSSI, status[1] = LQI)
           halSpiReadBurstReg(CCxxx0_RXFIFO, status, 2); 
//read CRC check bit
          halSpiStrobe(CCxxx0_SFRX);     //clear buffer
           return (status[1] & CRC_OK); //if check succeed return success
           *length = packetLength;
           halSpiStrobe(CCxxx0_SFRX);   //clear buffer
           return 0;
   return 0;

Data send process

void halRfSendPacket(INT8U *txBuffer, INT8U size)
   halSpiWriteReg(CCxxx0_TXFIFO, size);
   halSpiWriteBurstReg(CCxxx0_TXFIFO, txBuffer, size);// write the data which needed to be sent
   halSpiStrobe(CCxxx0_STX);     //enter into send mode to send data
   // Wait for GDO0 to be set -> sync transmitted
   while (!GDO0);
   // Wait for GDO0 to be cleared -> end of packet
   while (GDO0);



Demo Code