Wake on Radio Packet Error - CC1101

hayrettin erturk

Other Parts Discussed in Thread: CC1101

Hi,

I'm trying to communicate a couple of CC1101 modules on WOR mode. I'm on the 433Mhz with 464kHz channel bandwidth at 1.2kbps.

I have used the settings for wor, on this link where Siri posted.

From transmitter I'm transmitting 140ms of preamble and send the data afterwards. Receiver successfully catch the packet. So no problem on catching packet. Also packet length is correct. But the real data inside the package is broken. It seems like did not successfully catch the packet bytes even though catch at correct length.

Note: As I noticed now it catches the first byte right after the length byte correctly. So in my guess, maybe somehow RX mode finishes and bytes corrupt.

What can be the cause for a situation like this? Upon your request I can supply the all settings etc.

over 9 years ago

0 Siri over 9 years ago

TI__Guru* 79361 points

I am afraid I will need your register settings and packet format to be able to help you.

If I do I can set up a small test where I use your settings and transmit the same packet as you are and I can see if I get the same problems as you are experiencing.

Siri

0 hayrettin erturk over 9 years ago in reply to Siri

Prodigy 90 points

Packet is:

unsigned char packet[10] = { 0x09, 0x21, 0x01, 0x01, 0x00 ,0x01, 0x02, 0x00, 0x01, 0x00};

(P.s: As I stated I'm able to receive 0x21 also but not after that)

This is the transmitter settings, no wor mode active on trasnmitter side:

struct sCC1101
{
  unsigned char iocfg2;   // GDO2 output pin configuration
  unsigned char iocfg1;   // GDO1 output pin configuration
  unsigned char iocfg0;   // GDO0 output pin configuration
  unsigned char fifothr;  // RXFIFO and TXFIFO thresholds
  unsigned char sync1;    // Sync word, high byte
  unsigned char sync0;    // Sync word, low byte
  unsigned char pktlen;   // Packet length
  unsigned char pktctrl1; // Packet automation control
  unsigned char pktctrl0; // Packet automation control
  unsigned char addr;     // Device address
  unsigned char channr;   // Channel number
  unsigned char fsctrl1;  // Frequency synthesizer control
  unsigned char fsctrl0;  // Frequency synthesizer control
  unsigned char freq2;    // Frequency control word, high byte
  unsigned char freq1;    // Frequency control word, middle byte
  unsigned char freq0;    // Frequency control word, low byte
  unsigned char mdmcfg4;  // Modem configuration 4
  unsigned char mdmcfg3;  // Modem configuration 3
  unsigned char mdmcfg2;  // Modem configuration 2
  unsigned char mdmcfg1;  // Modem configuration 1
  unsigned char mdmcfg0;  // Modem configuration 0
  unsigned char deviatn;  // Modem deviation setting
  unsigned char mcsm2;    // Main radio control state machine configuration
  unsigned char mcsm1;    // Main radio control state machine configuration
  unsigned char mcsm0;    // Main radio control state machine configuration
  unsigned char foccfg;   // Frequency offset compensation configuration
  unsigned char bscfg;    // Bit synchronization configuration
  unsigned char agcctrl2; // AGC control 2
  unsigned char agcctrl1; // AGC control 1
  unsigned char agcctrl0; // AGC control 0
  unsigned char worevt1;  // High byte event0 timeout
  unsigned char worevt0;  // Low byte event0 timeout
  unsigned char worctrl;  // Wake on radio control
  unsigned char frend1;   // Front end RX configuration
  unsigned char frend0;   // Front end TX configuration
  unsigned char fscal3;   // Frequency synthesizer calibration
  unsigned char fscal2;   // Frequency synthesizer calibration
  unsigned char fscal1;   // Frequency synthesizer calibration
  unsigned char fscal0;   // Frequency synthesizer calibration
  unsigned char rcctrl1;  // RC oscillator configuration
  unsigned char rcctrl0;  // RC oscillator configuration
  unsigned char fstest;   // Frequency synthesizer calibration control
  unsigned char ptest;    // Production test
  unsigned char agctest;  // AGC test
  unsigned char test2;    // Various test settings 2
  unsigned char test1;    // Various test settings 1
  unsigned char test0;    // Various test settings 0
};

static const struct sCC1101 gCC1101Settings = {
  //	GDx Pin Config
  0x2E,               // GDO2 output pin configuration.
  0x2E,               // GDO1 output pin configuration.
  0x06,               // GDO0 output pin configuration.

  // FIFO thresholds
  0x07,               // RXFIFO and TXFIFO thresholds.

  //	SYNC WORDS
  0xD3,               // Sync word, high byte
  0x91,               // Sync word, low byte

  //	PACKET LENGTH: 255
  0xFF,               // Packet length.

  //	PACKET AUTOMATION CONTROL
  0x0C,               // Packet automation control.
  0x05,               // Packet automation control.

  //	DEVICE ADDRESS
  0x00,               // Device address.

  //	CHANNEL NUMBER
  0x00,               // Channel number.

  //	FREQUENCY SYNTHESIZER
  0x0A,               // Frequency synthesizer control.
  0x00,               // Frequency synthesizer control.

  // FREQUENCY CONTROL : 433mhz
  0x10,               // Frequency control word, high byte.
  0xA7,               // Frequency control word, middle byte.
  0x62,               // Frequency control word, low byte.

  //	MODEM CONFIGURATION
  0x36,               // Modem configuration.
  0x83,               // Modem configuration.
  0x03,               // Modem configuration.
  0x21,               // Modem configuration.
  0xEE,               // Modem configuration.

  //	MODEM DEVIATION
  0x65,               // Modem deviation setting (when FSK modulation is enabled).
  //  15 yapsakta olur

  //	State Machine Configuration
  0x07,               // Main Radio Control State Machine configuration.
  0x00,               // Main Radio Control State Machine configuration.
  0x18,               // Main Radio Control State Machine configuration.

  //	FREQUENCY OFFSET
  0x16,               // Frequency Offset Compensation Configuration.

  //	BIT SYNC
  0x6C,               // Bit synchronization Configuration.

  //	AGC control
  0x07,               // AGC control.
  0x40,               // AGC control.
  0x91,               // AGC control.

  //	Even timeout
  0x87,               // High byte Event 0 timeout
  0x6B,               // Low byte Event 0 timeout

  //	Wake On Radio (WOR)
  0xF8,               // Wake On Radio control

  //	RX Config
  0x57,               // Front end RX configuration.
  0x10,               // Front end RX configuration.

  //	SYNTHESIZER CALIBRATION
  0xE9,               // Frequency synthesizer calibration.
  0x2A,               // Frequency synthesizer calibration.
  0x00,               // Frequency synthesizer calibration.
  0x1F,               // Frequency synthesizer calibration.

  //	RF Oscillator Config
  0x41,               // RC oscillator configuration
  0x00,               // RC oscillator configuration

  //	SYNTHESIZER CALIBRATION
  0x59,               // Frequency synthesizer calibration control

  //	VARIOUS TESTS
  0x7F,               // Production test
  0x3C,               // AGC test
  0x88,               // Various test settings.
  0x35,               // Various test settings.
  0x09                // Various test settings.
};

On the receiver side these are the settings:

static const struct sCC1101 gCC1101Settings = {
  //	GDx Pin Config
  0x2E,               // GDO2 output pin configuration.
  0x2E,               // GDO1 output pin configuration.
  0x06,               // GDO0 output pin configuration.

  // FIFO thresholds
  0x07,               // RXFIFO and TXFIFO thresholds.

  //	SYNC WORDS
  0xD3,               // Sync word, high byte
  0x91,               // Sync word, low byte

  //	PACKET LENGTH: 255
  0xFF,               // Packet length.

  //	PACKET AUTOMATION CONTROL
  0x64,               // Packet automation control.//4C auto flush if crc fail
  0x05,               // Packet automation control.

  //	DEVICE ADDRESS
  0x00,               // Device address.

  //	CHANNEL NUMBER
  0x00,               // Channel number.

  //	FREQUENCY SYNTHESIZER
  0x0A,               // Frequency synthesizer control.
  0x00,               // Frequency synthesizer control.

  // FREQUENCY CONTROL : 433mhz
  0x10,               // Frequency control word, high byte.
  0xA7,               // Frequency control word, middle byte.
  0x62,               // Frequency control word, low byte.

  //	MODEM CONFIGURATION
  0x36,               // Modem configuration.
  0x83,               // Modem configuration.
  0x03,               // Modem configuration.
  0x21,               // Modem configuration.
  0xEE,               // Modem configuration.

  //	MODEM DEVIATION
  0x65,               // Modem deviation setting (when FSK modulation is enabled).
 

  //	State Machine Configuration
  0x18,               // Main Radio Control State Machine configuration.
  0x00,               // Main Radio Control State Machine configuration.
  0x18,               // Main Radio Control State Machine configuration.

  //	FREQUENCY OFFSET
  0x16,               // Frequency Offset Compensation Configuration.

  //	BIT SYNC
  0x6C,               // Bit synchronization Configuration.

  //	AGC control
  0x07,               // AGC control.
  0x40,               // AGC control.
  0x91,               // AGC control.

  //	Even timeout
  0x11,               // High byte Event 0 timeout
  0x9A,               // Low byte Event 0 timeout
  // 
  //	Wake On Radio (WOR)
  0x78,               // Wake On Radio control

  //	RX Config
  0x57,               // Front end RX configuration.
  0x10,               // Front end RX configuration.

  //	SYNTHESIZER CALIBRATION
  0xE9,               // Frequency synthesizer calibration.
  0x2A,               // Frequency synthesizer calibration.
  0x00,               // Frequency synthesizer calibration.
  0x1F,               // Frequency synthesizer calibration.

  //	RF Oscillator Config
  0x41,               // RC oscillator configuration
  0x00,               // RC oscillator configuration

  //	SYNTHESIZER CALIBRATION
  0x59,               // Frequency synthesizer calibration control

  //	VARIOUS TESTS
  0x7F,               // Production test
  0x3C,               // AGC test
  0x88,               // Various test settings.
  0x35,               // Various test settings.
  0x09                // Various test settings.
};

0 Siri over 9 years ago in reply to hayrettin erturk

TI__Guru* 79361 points

I am afraid I am a bit confused here. You are saying that you are using 1.2 kbps and are sending 140 ms preamble but your settings show a data rate of 2.4 kbps and that you are sending 4 bytes of preamble.

4 bytes of preamble takes 13.3 ms to send.

The radio needs about 4 bytes of preamble for settling so using WOR will not work.

In the example I posted the transmitter transmits 24 bytes of preamble at 1.2 kbps. This takes 160 ms. You need to make sure you wake up often enough to make sure that you receive at least 4 bytes preamble. This means that your wake-up interval is 133 ms.

Siri

0 hayrettin erturk over 9 years ago in reply to Siri

Prodigy 90 points

Hello,

Sorry for confusion, my mistake I forget I changed the baud rate for trying at last night .

About preambling, actually I'm doing it manually comparing to your 24 byte preamble settings solution.

I set the radio on TX mode and wait for 140ms on mcu and then load the FIFO and send the data.

On the receiver side as I stated before it receives the packet even first data byte correctly. If it is not settling, how it is taking length and first data byte correctly?

EDIT:

As it is really interesting, after your post I tried with 24 bytes preamble setting instead of my stone aged manuall preamble technique. And I received the packet with CRC OK. So in this case my problem seems solved. Thanks for your help.

But I'm still confused about why the data corrupts in my way where I wait for 140ms manually.

0 Siri over 9 years ago in reply to hayrettin erturk

TI__Guru* 79361 points

I tested 1.2 kbps with a BW of 464 kHz and was not able to receive any data. By reducing the RX Filter BW to 323 kHz everything worked fine. I programmed the transmitter to transmit 24 bytes of preamble and disabled PQT.

My settings are found below:

static const registerSetting_t preferredSettings[]={

{CC1101_IOCFG0,        0x06},
{CC1101_PKTCTRL0,      0x05},
{CC1101_FSCTRL1,       0x08},
{CC1101_FREQ2,         0x10},
{CC1101_FREQ1,         0xA7},
{CC1101_FREQ0,         0x62},
{CC1101_MDMCFG4,       0x55},
{CC1101_MDMCFG3,       0x83},
{CC1101_MDMCFG2,       0x13},
{CC1101_MDMCFG1,       0x72},
{CC1101_DEVIATN,       0x15},
{CC1101_MCSM0,         0x18},
{CC1101_FOCCFG,        0x1D},
{CC1101_BSCFG,         0x1C},
{CC1101_AGCCTRL2,      0xC7},
{CC1101_AGCCTRL1,      0x00},
{CC1101_AGCCTRL0,      0xB2},
{CC1101_WORCTRL,       0xFB},
{CC1101_FREND1,        0xB6},
{CC1101_FSCAL3,        0xE9},
{CC1101_FSCAL2,        0x2A},
{CC1101_FSCAL1,        0x00},
{CC1101_FSCAL0,        0x1F},
{CC1101_TEST0,         0x09},
{CC1101_RSSI,          0x80},
{CC1101_MARCSTATE,     0x01},
{CC1101_VCO_VC_DAC,    0x94},
{CC1101_WORCTRL,       0x78},
{CC1101_WOREVT1,       0x11},
{CC1101_WOREVT0,       0x9A},
{CC1101_MCSM2,         0x18},
};

Siri

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Wake on Radio Packet Error - CC1101