• State
  • Locked Locked
  • Replies 5 replies
  • Subscribers 17 subscribers
  • Views 1491 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

4-FSK and CC1110

Emanuele8874
Intellectual 510 points
Other Parts Discussed in Thread: CC1101, TEST2

Hello,

I've a problem on setting CC1110 with 4FSK modulation.  The device works fine with 500kbps MSK, but I don't know how to set register to work with 4FSK at 600kbps. The frequency is 433MHz.

500kbps MSK registers setting are:

  PKTCTRL1 = 0x04;          // No address check. Append status bytes.
  PKTCTRL0 = 0x45;          // Variable packet length. Use CRC. Enable whitening
  PKTLEN = 0xFF;               // Maximum packet length (255 bytes)

  FREQ2 = 0x10;   // Frequency control word, high byte.
  FREQ1 = 0xA7;   // Frequency control word, middle byte.
  FREQ0 = 0x62;   // Frequency control word, low byte.

  // Filter BW, data rate.
  MDMCFG4 = 0x0E;           // Data Rate = 500 kbps
  MDMCFG3 = 0x3B;           // Rx filter bandwidth = 812.5 kHz

  // IF frequency
  FSCTRL1 = 0x10;           // IF Frequency: 406.25 kHz
  FSCTRL0 = 0x00;

  // Modulation format, detection level
  MDMCFG2 = 0x73;           // 30/32 bits sync word detection. MSK modulation.
  MDMCFG1 = 0x43;           // 8 byte preamble. No FEC.
  MDMCFG0 = 0x3B;           // Channel spacing: 250 kHz

  // Deviation setting
  DEVIATN = 0x00;

MCSM2 = 0x07;

MCSM1 = 0x30;             // RXOFF_MOODE: Idle; TXOFF_MODE: Idle

MCSM0 = 0x34;             // Automatic FS calibration Every 4th time when going from RX or TX to IDLE, Close_in RX 0dB attenuation

  // Frequency offset compensation configuration
  FOCCFG = 0x1D;

  // Bit synchronization
  BSCFG = 0x1C;

  AGCCTRL2 = 0xC7;
  AGCCTRL1 = 0x00;
  AGCCTRL0 = 0xB0;
  FREND1 = 0xB6;
  FREND0 = 0x10;
  FSCAL3 = 0xEA;
  FSCAL2 = 0x2A;
  FSCAL1 = 0x00;
  FSCAL0 = 0x1F;


  PA_TABLE0 = 0x60;         // Output power: 0 dBm

I try to change the following register:

    // Filter BW, data rate.
  MDMCFG4 = 0x1D;           // Data Rate = 300 kbps
  MDMCFG3 = 0x7A;           // Rx filter bandwidth = 650 kHz

  FSCTRL1 = 0x06;        
  FSCTRL0 = 0x00;

  // Deviation setting
  DEVIATN = 0x71;           // Deviation 228.515625 KHz

but the I cannot receive.

Can the CC1110 works with 4fsk modulation? Can SmartRF Studio generates the optimum register setting for CC1110 4fsk?

Thank you

  • 0
    TI__Mastermind 39860 points

    Design note DN036 gives the register settings.  See the appendix.

    Note also that for 600 kbps datar rate, 4-FSK you need to enter 300 kBaud in SmartRF Studio.

     

    You can generate the settings in Studio as follows:

    a) Start with 500 kBaud, MSK preferred settings

    b) Change Baud rate to 300 kBaud, modulation format to 4-FSK, frequency deviation to 228 kHz

    DN036 CC1101+CC1190 600 kbps Data Rate +19 dBm Transmit Power without FHSS in 902-928 MHz Frequency Band.pdf
  • 0 in reply to Sverre
    Intellectual 510 points

    Thank you Sverre,

    but in Smart RF studio for CC1110 there isn't 4-fsk modulation.

    I follow the DN036, and also I use the register setting value generated from Smart RF Studio for CC1101.

    The register that have to be changed from 500kbps MSK to 600kbps 4FSK seem to be:

    MDMCFG4 = 0x0D;           // Data Rate = 300 kbps
    MDMCFG3 = 0x7A;            // Rx filter bandwidth = 650 kHz
    FSCTRL1 = 0x0e;           // IF Frequency: 406.25 kHz
    FSCTRL0 = 0x00;
    MDMCFG2 = 0x43;           // 30/32 bits sync word detection. 4-FSK modulation.
    MDMCFG1 = 0x42;          
    MDMCFG0 = 0xf8;          
    DEVIATN = 0x71;           // Deviation 228.515625 KHz

    On the receiver side, I have a only CRC Error.

    Where is the error? Thank you

  • 0 in reply to Emanuele8874
    Intellectual 510 points

    Hi Sverre,

    I still haven't solved the problem. Is there a difference in packet struct changing the modulation format from MSK (500kbps) and 4FSK (600kbps)?

    With 4fsk I have only CRC error on RX site.

    Thank you

  • 0 in reply to Emanuele8874
    TI__Mastermind 39860 points

    Answer is long, long overdue. 

    Just realized that the register mapping is different for CC1101 and CC1110 for some of the non-documented settings.  

    DN036 "Register settings used are given in the appendix. It is recommended to increase the CC1101 loop filter BW when operating at 600 kbps, 4-FSK. This is achieved by setting FIFOTHR[7] = 1 and TEST2[1] = 1." FIFOTHR does not exist on CC1110. For CC1110 the following is correct: MCSM0[3] = 1 and TEST2[1] = 1

  • 0 in reply to Sverre
    Prodigy 250 points

    I would like to follow up on this post from half a decade earlier.. 

    I am trying to get the highest data rate possible out of the CC1101 at 916 Mhz, and I need to maintain this transmission for about 5-8 hours if possible.

    I followed the procedure prescribed in smartRF studio and I get 100% packet error rate. I am using two cc1101s on the smartRF boards with the following register settings that were yielded by the above process.

     Sync word qualifier mode = 30/32 sync word bits detected 
 CRC autoflush = false 
 Channel spacing = 199.951172 
 Data format = Normal mode 
 Data rate = 299.927 
 RX filter BW = 812.500000 
 PA ramping = false 
 Preamble count = 8 
 Address config = No address check 
 Whitening = false 
 Carrier frequency = 867.999939 
 Device address = 0 
 TX power = 0 
 Manchester enable = false 
 CRC enable = true 
 Deviation = 228.515625 
 Modulation format = 4-FSK 
 Base frequency = 867.999939 
 Modulated = true 
 Channel number = 0 
IOCFG2        29
IOCFG1        2E
IOCFG0        06
FIFOTHR       87
SYNC1         D3
SYNC0         91
PKTLEN        FF
PKTCTRL1      04
PKTCTRL0      05
ADDR          00
CHANNR        00
FSCTRL1       0E
FSCTRL0       00
FREQ2         21
FREQ1         62
FREQ0         76
MDMCFG4       0D
MDMCFG3       7A
MDMCFG2       43
MDMCFG1       42
MDMCFG0       F8
DEVIATN       71
MCSM2         07
MCSM1         30
MCSM0         18
FOCCFG        1D
BSCFG         1C
AGCCTRL2      C7
AGCCTRL1      00
AGCCTRL0      B0
WOREVT1       87
WOREVT0       6B
WORCTRL       F8
FREND1        B6
FREND0        10
FSCAL3        EA
FSCAL2        2A
FSCAL1        00
FSCAL0        1F
RCCTRL1       41
RCCTRL0       00
FSTEST        59
PTEST         7F
AGCTEST       3F
TEST2         88
TEST1         31
TEST0         09
PARTNUM       00
VERSION       04
FREQEST       00
LQI           00
RSSI          80
MARCSTATE     01
WORTIME1      00
WORTIME0      00
PKTSTATUS     00
VCO_VC_DAC    94
TXBYTES       00
RXBYTES       00
RCCTRL1_STATUS 00
RCCTRL0_STATUS 00


    Any advice would be greatly appreciated!