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CC1110 packet loss due to CRC is bad.

Yi Liu67
Prodigy 50 points


Hi there,

We ran into a packet loss issue with CC1110, could you advise?

Bench setup:

1. 915 MHz in Frequency Hopping mode.

2. LPRF has 10dB transmit power.

3. A wire connects the LPRF and DUT's attennas with about 75dB attenuators in between.

4. IRQ_DONE is enabled and used to indicate a packet has received.

Observation:

1. the packet loss is about 1-2%.

2. The reason for the packet loss is due to the bad CRC, bit7 of the second byte appended after the data some time came back with 0.

Thanks,

Yi Liu

  • 0
    TI__Guru**** 317180 points
    Please provide which register settings you are using. Does this occur if frequency hopping is not in use.
  • 0 in reply to TER
    Prodigy 50 points

    The 915 runs with 27MHz Crystal, and 868 runs with 26MHz Crystal.

    Fullscreen 5126.20140116_915FH_settings.xml Download 
    <?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE configuration SYSTEM "C:/Program Files/Texas Instruments/SmartRF Tools/SmartRF Studio 7/config/xml/configdata.dtd"[]>
<dcpanelconfiguration>
    <Devicename>CC1110</Devicename>
    <Description>Saved configuration data</Description>
    <registersettings>
        <Register>
            <Name>ADDR</Name>
            <Value>0x34</Value>
        </Register>
        <Register>
            <Name>AGCCTRL1</Name>
            <Value>0x60</Value>
        </Register>
        <Register>
            <Name>AGCCTRL2</Name>
            <Value>0x43</Value>
        </Register>
        <Register>
            <Name>DEVIATN</Name>
            <Value>0x42</Value>
        </Register>
        <Register>
            <Name>FOCCFG</Name>
            <Value>0x00</Value>
        </Register>
        <Register>
            <Name>FREQ0</Name>
            <Value>0xaa</Value>
        </Register>
        <Register>
            <Name>FREQ1</Name>
            <Value>0x6a</Value>
        </Register>
        <Register>
            <Name>FREQ2</Name>
            <Value>0x21</Value>
        </Register>
        <Register>
            <Name>FSCAL0</Name>
            <Value>0x1f</Value>
        </Register>
        <Register>
            <Name>FSCAL1</Name>
            <Value>0x00</Value>
        </Register>
        <Register>
            <Name>FSCAL2</Name>
            <Value>0x2a</Value>
        </Register>
        <Register>
            <Name>FSCAL3</Name>
            <Value>0xe9</Value>
        </Register>
        <Register>
            <Name>FSCTRL1</Name>
            <Value>0x06</Value>
        </Register>
        <Register>
            <Name>MCSM0</Name>
            <Value>0x18</Value>
        </Register>
        <Register>
            <Name>MDMCFG0</Name>
            <Value>0x2f</Value>
        </Register>
        <Register>
            <Name>MDMCFG1</Name>
            <Value>0x23</Value>
        </Register>
        <Register>
            <Name>MDMCFG2</Name>
            <Value>0x13</Value>
        </Register>
        <Register>
            <Name>MDMCFG3</Name>
            <Value>0x79</Value>
        </Register>
        <Register>
            <Name>MDMCFG4</Name>
            <Value>0xaa</Value>
        </Register>
        <Register>
            <Name>PA_TABLE0</Name>
            <Value>0xc0</Value>
        </Register>
        <Register>
            <Name>PKTCTRL0</Name>
            <Value>0x44</Value>
        </Register>
        <Register>
            <Name>PKTCTRL1</Name>
            <Value>0x07</Value>
        </Register>
        <Register>
            <Name>PKTLEN</Name>
            <Value>0x22</Value>
        </Register>
        <Register>
            <Name>TEST0</Name>
            <Value>0x09</Value>
        </Register>
        <Register>
            <Name>TEST1</Name>
            <Value>0x31</Value>
        </Register>
    </registersettings>
    <dcpanel>
        <Property role="44" name="m_chkRegView">2</Property>
        <Property role="44" name="m_chkRfParameters">2</Property>
        <Property role="37" name="m_tabUserMode">0</Property>
        <Property role="33" name="m_easyModeSettings">-1</Property>
        <Property role="33" name="m_typicalSettings">-1</Property>
        <Property role="37" name="m_testFuncPanel">0</Property>
    </dcpanel>
    <rfparameters>
        <Property role="46" name="Xtal frequency">27.000000</Property>
    </rfparameters>
    <conttx>
        <Property role="45" name="m_rbtModulated">1</Property>
        <Property role="45" name="m_rbtUnmodulated">0</Property>
        <Property role="46" name="m_cmbDataFormat">-1</Property>
        <Property role="44" name="m_chkFreqSweep">0</Property>
        <Property role="44" name="m_chkChanSweep">0</Property>
    </conttx>
    <contrx>
        <Property role="46" name="m_cmbDataFormat">-1</Property>
        <Property role="44" name="m_chkAutoScroll">2</Property>
    </contrx>
    <packettx>
        <Property role="42" name="m_edtPayloadSize">30</Property>
        <Property role="42" name="m_edtPacketCount">100</Property>
        <Property role="42" name="m_edtPacketCountEsy">100</Property>
        <Property role="42" name="m_edtRandomPacketData">13 0d 89 0a 1c db ae 32 20 9a 50 ee 40 78 36 fd 12 49 32 f6 9e 7d 49 dc ad 4f 14 f2 </Property>
        <Property role="42" name="m_edtPacketData"></Property>
        <Property role="42" name="m_edtAccessAddress"></Property>
        <Property role="44" name="m_chkAddSeqNbr">2</Property>
        <Property role="44" name="m_chkInfinite">0</Property>
        <Property role="44" name="m_chkInfiniteEsy">0</Property>
        <Property role="45" name="m_rbtRandom">1</Property>
        <Property role="45" name="m_rbtText">0</Property>
        <Property role="45" name="m_rbtHex">0</Property>
        <Property role="44" name="m_chkAdvanced">0</Property>
    </packettx>
    <packetrx>
        <Property role="42" name="m_edtPacketCount">100</Property>
        <Property role="42" name="m_edtPacketCountEsy">100</Property>
        <Property role="42" name="m_edtAccessAddress"></Property>
        <Property role="44" name="m_chkInfinite">0</Property>
        <Property role="44" name="m_chkInfiniteEsy">0</Property>
        <Property role="46" name="m_cmbViewFormat">0</Property>
        <Property role="44" name="m_chkSeqNbrIncluded">2</Property>
        <Property role="42" name="m_edtDumpFile"></Property>
        <Property role="44" name="m_chkAdvanced">0</Property>
    </packetrx>
    <commandpanel>
        <Property role="44" name="m_chkInsertLength">0</Property>
        <Property role="42" name="m_edtTxFifo"></Property>
        <Property role="42" name="m_edtRxFifo"></Property>
        <Property role="46" name="m_cmbInstrInput">-1</Property>
    </commandpanel>
</dcpanelconfiguration>

    Fullscreen 7510.20140116_868FH_26MHZ_settings.xml Download 
    <?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE configuration SYSTEM "C:/Program Files/Texas Instruments/SmartRF Tools/SmartRF Studio 7/config/xml/configdata.dtd"[]>
<dcpanelconfiguration>
    <Devicename>CC1110</Devicename>
    <Description>Saved configuration data</Description>
    <registersettings>
        <Register>
            <Name>ADDR</Name>
            <Value>0x34</Value>
        </Register>
        <Register>
            <Name>AGCCTRL1</Name>
            <Value>0x6b</Value>
        </Register>
        <Register>
            <Name>AGCCTRL2</Name>
            <Value>0x43</Value>
        </Register>
        <Register>
            <Name>DEVIATN</Name>
            <Value>0x40</Value>
        </Register>
        <Register>
            <Name>FOCCFG</Name>
            <Value>0x00</Value>
        </Register>
        <Register>
            <Name>FREQ0</Name>
            <Value>0xb0</Value>
        </Register>
        <Register>
            <Name>FREQ1</Name>
            <Value>0x32</Value>
        </Register>
        <Register>
            <Name>FREQ2</Name>
            <Value>0x21</Value>
        </Register>
        <Register>
            <Name>FSCAL0</Name>
            <Value>0x1f</Value>
        </Register>
        <Register>
            <Name>FSCAL1</Name>
            <Value>0x00</Value>
        </Register>
        <Register>
            <Name>FSCAL2</Name>
            <Value>0x2a</Value>
        </Register>
        <Register>
            <Name>FSCAL3</Name>
            <Value>0xe9</Value>
        </Register>
        <Register>
            <Name>FSCTRL1</Name>
            <Value>0x06</Value>
        </Register>
        <Register>
            <Name>MCSM0</Name>
            <Value>0x18</Value>
        </Register>
        <Register>
            <Name>MDMCFG0</Name>
            <Value>0x7a</Value>
        </Register>
        <Register>
            <Name>MDMCFG2</Name>
            <Value>0x12</Value>
        </Register>
        <Register>
            <Name>MDMCFG3</Name>
            <Value>0x87</Value>
        </Register>
        <Register>
            <Name>MDMCFG4</Name>
            <Value>0xaa</Value>
        </Register>
        <Register>
            <Name>PA_TABLE0</Name>
            <Value>0xc2</Value>
        </Register>
        <Register>
            <Name>PKTCTRL0</Name>
            <Value>0x44</Value>
        </Register>
        <Register>
            <Name>PKTCTRL1</Name>
            <Value>0x07</Value>
        </Register>
        <Register>
            <Name>PKTLEN</Name>
            <Value>0x22</Value>
        </Register>
        <Register>
            <Name>TEST0</Name>
            <Value>0x09</Value>
        </Register>
        <Register>
            <Name>TEST1</Name>
            <Value>0x31</Value>
        </Register>
    </registersettings>
    <dcpanel>
        <Property role="44" name="m_chkRegView">2</Property>
        <Property role="44" name="m_chkRfParameters">2</Property>
        <Property role="37" name="m_tabUserMode">0</Property>
        <Property role="33" name="m_easyModeSettings">-1</Property>
        <Property role="33" name="m_typicalSettings">-1</Property>
        <Property role="37" name="m_testFuncPanel">0</Property>
    </dcpanel>
    <rfparameters>
        <Property role="46" name="Xtal frequency">26.000000</Property>
    </rfparameters>
    <conttx>
        <Property role="45" name="m_rbtModulated">1</Property>
        <Property role="45" name="m_rbtUnmodulated">0</Property>
        <Property role="46" name="m_cmbDataFormat">-1</Property>
        <Property role="44" name="m_chkFreqSweep">0</Property>
        <Property role="44" name="m_chkChanSweep">0</Property>
    </conttx>
    <contrx>
        <Property role="46" name="m_cmbDataFormat">-1</Property>
        <Property role="44" name="m_chkAutoScroll">2</Property>
    </contrx>
    <packettx>
        <Property role="42" name="m_edtPayloadSize">30</Property>
        <Property role="42" name="m_edtPacketCount">100</Property>
        <Property role="42" name="m_edtPacketCountEsy">100</Property>
        <Property role="42" name="m_edtRandomPacketData">13 0d 89 0a 1c db ae 32 20 9a 50 ee 40 78 36 fd 12 49 32 f6 9e 7d 49 dc ad 4f 14 f2 </Property>
        <Property role="42" name="m_edtPacketData"></Property>
        <Property role="42" name="m_edtAccessAddress"></Property>
        <Property role="44" name="m_chkAddSeqNbr">2</Property>
        <Property role="44" name="m_chkInfinite">0</Property>
        <Property role="44" name="m_chkInfiniteEsy">0</Property>
        <Property role="45" name="m_rbtRandom">1</Property>
        <Property role="45" name="m_rbtText">0</Property>
        <Property role="45" name="m_rbtHex">0</Property>
        <Property role="44" name="m_chkAdvanced">0</Property>
    </packettx>
    <packetrx>
        <Property role="42" name="m_edtPacketCount">100</Property>
        <Property role="42" name="m_edtPacketCountEsy">100</Property>
        <Property role="42" name="m_edtAccessAddress"></Property>
        <Property role="44" name="m_chkInfinite">0</Property>
        <Property role="44" name="m_chkInfiniteEsy">0</Property>
        <Property role="46" name="m_cmbViewFormat">0</Property>
        <Property role="44" name="m_chkSeqNbrIncluded">2</Property>
        <Property role="42" name="m_edtDumpFile"></Property>
        <Property role="44" name="m_chkAdvanced">0</Property>
    </packetrx>
    <commandpanel>
        <Property role="44" name="m_chkInsertLength">0</Property>
        <Property role="42" name="m_edtTxFifo"></Property>
        <Property role="42" name="m_edtRxFifo"></Property>
        <Property role="46" name="m_cmbInstrInput">-1</Property>
    </commandpanel>
</dcpanelconfiguration>

  • 0
    Prodigy 50 points

    Fullscreen 8713.20131002_915_FIXED_911_779_settings.xml Download 
    <?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE configuration SYSTEM "C:/Program Files/Texas Instruments/SmartRF Tools/SmartRF Studio 7/config/xml/configdata.dtd"[]>
<dcpanelconfiguration>
    <Devicename>CC1110</Devicename>
    <Description>Saved configuration data</Description>
    <registersettings>
        <Register>
            <Name>ADDR</Name>
            <Value>0x34</Value>
        </Register>
        <Register>
            <Name>AGCCTRL1</Name>
            <Value>0x60</Value>
        </Register>
        <Register>
            <Name>AGCCTRL2</Name>
            <Value>0x43</Value>
        </Register>
        <Register>
            <Name>DEVIATN</Name>
            <Value>0x44</Value>
        </Register>
        <Register>
            <Name>FOCCFG</Name>
            <Value>0x00</Value>
        </Register>
        <Register>
            <Name>FREQ0</Name>
            <Value>0x06</Value>
        </Register>
        <Register>
            <Name>FREQ1</Name>
            <Value>0xc5</Value>
        </Register>
        <Register>
            <Name>FREQ2</Name>
            <Value>0x21</Value>
        </Register>
        <Register>
            <Name>FSCAL0</Name>
            <Value>0x1f</Value>
        </Register>
        <Register>
            <Name>FSCAL1</Name>
            <Value>0x00</Value>
        </Register>
        <Register>
            <Name>FSCAL2</Name>
            <Value>0x2a</Value>
        </Register>
        <Register>
            <Name>FSCAL3</Name>
            <Value>0xe9</Value>
        </Register>
        <Register>
            <Name>FSCTRL1</Name>
            <Value>0x06</Value>
        </Register>
        <Register>
            <Name>MCSM0</Name>
            <Value>0x18</Value>
        </Register>
        <Register>
            <Name>MDMCFG0</Name>
            <Value>0xe5</Value>
        </Register>
        <Register>
            <Name>MDMCFG1</Name>
            <Value>0x12</Value>
        </Register>
        <Register>
            <Name>MDMCFG2</Name>
            <Value>0x13</Value>
        </Register>
        <Register>
            <Name>MDMCFG3</Name>
            <Value>0x75</Value>
        </Register>
        <Register>
            <Name>MDMCFG4</Name>
            <Value>0x9a</Value>
        </Register>
        <Register>
            <Name>PA_TABLE0</Name>
            <Value>0x8e</Value>
        </Register>
        <Register>
            <Name>PKTCTRL0</Name>
            <Value>0x44</Value>
        </Register>
        <Register>
            <Name>PKTCTRL1</Name>
            <Value>0x07</Value>
        </Register>
        <Register>
            <Name>PKTLEN</Name>
            <Value>0x22</Value>
        </Register>
        <Register>
            <Name>TEST0</Name>
            <Value>0x09</Value>
        </Register>
        <Register>
            <Name>TEST1</Name>
            <Value>0x31</Value>
        </Register>
    </registersettings>
    <dcpanel>
        <Property role="44" name="m_chkRegView">2</Property>
        <Property role="44" name="m_chkRfParameters">2</Property>
        <Property role="37" name="m_tabUserMode">0</Property>
        <Property role="33" name="m_easyModeSettings">-1</Property>
        <Property role="33" name="m_typicalSettings">-1</Property>
        <Property role="37" name="m_testFuncPanel">0</Property>
    </dcpanel>
    <rfparameters>
        <Property role="46" name="Xtal frequency">27.000000</Property>
    </rfparameters>
    <conttx>
        <Property role="45" name="m_rbtModulated">1</Property>
        <Property role="45" name="m_rbtUnmodulated">0</Property>
        <Property role="46" name="m_cmbDataFormat">-1</Property>
        <Property role="44" name="m_chkFreqSweep">0</Property>
        <Property role="44" name="m_chkChanSweep">0</Property>
    </conttx>
    <contrx>
        <Property role="46" name="m_cmbDataFormat">-1</Property>
        <Property role="44" name="m_chkAutoScroll">2</Property>
    </contrx>
    <packettx>
        <Property role="42" name="m_edtPayloadSize">30</Property>
        <Property role="42" name="m_edtPacketCount">100</Property>
        <Property role="42" name="m_edtPacketCountEsy">100</Property>
        <Property role="42" name="m_edtRandomPacketData">13 0d 89 0a 1c db ae 32 20 9a 50 ee 40 78 36 fd 12 49 32 f6 9e 7d 49 dc ad 4f 14 f2 </Property>
        <Property role="42" name="m_edtPacketData"></Property>
        <Property role="42" name="m_edtAccessAddress"></Property>
        <Property role="44" name="m_chkAddSeqNbr">2</Property>
        <Property role="44" name="m_chkInfinite">0</Property>
        <Property role="44" name="m_chkInfiniteEsy">0</Property>
        <Property role="45" name="m_rbtRandom">1</Property>
        <Property role="45" name="m_rbtText">0</Property>
        <Property role="45" name="m_rbtHex">0</Property>
        <Property role="44" name="m_chkAdvanced">0</Property>
    </packettx>
    <packetrx>
        <Property role="42" name="m_edtPacketCount">100</Property>
        <Property role="42" name="m_edtPacketCountEsy">100</Property>
        <Property role="42" name="m_edtAccessAddress"></Property>
        <Property role="44" name="m_chkInfinite">0</Property>
        <Property role="44" name="m_chkInfiniteEsy">0</Property>
        <Property role="46" name="m_cmbViewFormat">0</Property>
        <Property role="44" name="m_chkSeqNbrIncluded">2</Property>
        <Property role="42" name="m_edtDumpFile"></Property>
        <Property role="44" name="m_chkAdvanced">0</Property>
    </packetrx>
    <commandpanel>
        <Property role="44" name="m_chkInsertLength">0</Property>
        <Property role="42" name="m_edtTxFifo"></Property>
        <Property role="42" name="m_edtRxFifo"></Property>
        <Property role="46" name="m_cmbInstrInput">-1</Property>
    </commandpanel>
</dcpanelconfiguration>
    Fullscreen 3324.20131009_868_FIXED_863_779_26MHZ_settings.xml Download 
    <?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE configuration SYSTEM "C:/Program Files/Texas Instruments/SmartRF Tools/SmartRF Studio 7/config/xml/configdata.dtd"[]>
<dcpanelconfiguration>
    <Devicename>CC1110</Devicename>
    <Description>Saved configuration data</Description>
    <registersettings>
        <Register>
            <Name>ADDR</Name>
            <Value>0x34</Value>
        </Register>
        <Register>
            <Name>AGCCTRL1</Name>
            <Value>0x6b</Value>
        </Register>
        <Register>
            <Name>AGCCTRL2</Name>
            <Value>0x43</Value>
        </Register>
        <Register>
            <Name>DEVIATN</Name>
            <Value>0x42</Value>
        </Register>
        <Register>
            <Name>FOCCFG</Name>
            <Value>0x00</Value>
        </Register>
        <Register>
            <Name>FREQ0</Name>
            <Value>0xe9</Value>
        </Register>
        <Register>
            <Name>FREQ1</Name>
            <Value>0x38</Value>
        </Register>
        <Register>
            <Name>FREQ2</Name>
            <Value>0x21</Value>
        </Register>
        <Register>
            <Name>FSCAL0</Name>
            <Value>0x1f</Value>
        </Register>
        <Register>
            <Name>FSCAL1</Name>
            <Value>0x00</Value>
        </Register>
        <Register>
            <Name>FSCAL2</Name>
            <Value>0x2a</Value>
        </Register>
        <Register>
            <Name>FSCAL3</Name>
            <Value>0xe9</Value>
        </Register>
        <Register>
            <Name>FSCTRL1</Name>
            <Value>0x06</Value>
        </Register>
        <Register>
            <Name>MCSM0</Name>
            <Value>0x18</Value>
        </Register>
        <Register>
            <Name>MDMCFG0</Name>
            <Value>0xf7</Value>
        </Register>
        <Register>
            <Name>MDMCFG1</Name>
            <Value>0x12</Value>
        </Register>
        <Register>
            <Name>MDMCFG2</Name>
            <Value>0x13</Value>
        </Register>
        <Register>
            <Name>MDMCFG3</Name>
            <Value>0x83</Value>
        </Register>
        <Register>
            <Name>MDMCFG4</Name>
            <Value>0x9a</Value>
        </Register>
        <Register>
            <Name>PA_TABLE0</Name>
            <Value>0x50</Value>
        </Register>
        <Register>
            <Name>PKTCTRL0</Name>
            <Value>0x44</Value>
        </Register>
        <Register>
            <Name>PKTCTRL1</Name>
            <Value>0x07</Value>
        </Register>
        <Register>
            <Name>PKTLEN</Name>
            <Value>0x22</Value>
        </Register>
        <Register>
            <Name>TEST0</Name>
            <Value>0x09</Value>
        </Register>
        <Register>
            <Name>TEST1</Name>
            <Value>0x31</Value>
        </Register>
    </registersettings>
    <dcpanel>
        <Property role="44" name="m_chkRegView">2</Property>
        <Property role="44" name="m_chkRfParameters">2</Property>
        <Property role="37" name="m_tabUserMode">0</Property>
        <Property role="33" name="m_easyModeSettings">-1</Property>
        <Property role="33" name="m_typicalSettings">-1</Property>
        <Property role="37" name="m_testFuncPanel">0</Property>
    </dcpanel>
    <rfparameters>
        <Property role="46" name="Xtal frequency">26.000000</Property>
    </rfparameters>
    <conttx>
        <Property role="45" name="m_rbtModulated">1</Property>
        <Property role="45" name="m_rbtUnmodulated">0</Property>
        <Property role="46" name="m_cmbDataFormat">-1</Property>
        <Property role="44" name="m_chkFreqSweep">0</Property>
        <Property role="44" name="m_chkChanSweep">0</Property>
    </conttx>
    <contrx>
        <Property role="46" name="m_cmbDataFormat">-1</Property>
        <Property role="44" name="m_chkAutoScroll">2</Property>
    </contrx>
    <packettx>
        <Property role="42" name="m_edtPayloadSize">30</Property>
        <Property role="42" name="m_edtPacketCount">100</Property>
        <Property role="42" name="m_edtPacketCountEsy">100</Property>
        <Property role="42" name="m_edtRandomPacketData">13 0d 89 0a 1c db ae 32 20 9a 50 ee 40 78 36 fd 12 49 32 f6 9e 7d 49 dc ad 4f 14 f2 </Property>
        <Property role="42" name="m_edtPacketData"></Property>
        <Property role="42" name="m_edtAccessAddress"></Property>
        <Property role="44" name="m_chkAddSeqNbr">2</Property>
        <Property role="44" name="m_chkInfinite">0</Property>
        <Property role="44" name="m_chkInfiniteEsy">0</Property>
        <Property role="45" name="m_rbtRandom">1</Property>
        <Property role="45" name="m_rbtText">0</Property>
        <Property role="45" name="m_rbtHex">0</Property>
        <Property role="44" name="m_chkAdvanced">0</Property>
    </packettx>
    <packetrx>
        <Property role="42" name="m_edtPacketCount">100</Property>
        <Property role="42" name="m_edtPacketCountEsy">100</Property>
        <Property role="42" name="m_edtAccessAddress"></Property>
        <Property role="44" name="m_chkInfinite">0</Property>
        <Property role="44" name="m_chkInfiniteEsy">0</Property>
        <Property role="46" name="m_cmbViewFormat">0</Property>
        <Property role="44" name="m_chkSeqNbrIncluded">2</Property>
        <Property role="42" name="m_edtDumpFile"></Property>
        <Property role="44" name="m_chkAdvanced">0</Property>
    </packetrx>
    <commandpanel>
        <Property role="44" name="m_chkInsertLength">0</Property>
        <Property role="42" name="m_edtTxFifo"></Property>
        <Property role="42" name="m_edtRxFifo"></Property>
        <Property role="46" name="m_cmbInstrInput">-1</Property>
    </commandpanel>
</dcpanelconfiguration>
    The

    packet loss rate in fixed frequency is about <0.01%.

     

  • 0 in reply to Yi Liu67
    TI__Guru**** 317180 points

    We have seen something similar before.

    In a previous case a GDO changing at the end of the packet caused a voltage dip close to the xtal probably causing it to send the last bit at the wrong frequency.

    Try to find out what is happening in the code close to sending the last bits in the CRC when doing freq hopping vs when you are not doing it and monitor IOs etc.

  • 0 in reply to Yi Liu67
    Prodigy 50 points

    The GDO in our case are not used. The IOCFGx registers are default to 0x00. GPIO are not overridden by radio as outputs (per data sheet).

     

    Radio is configured not to use the GDO pins P1_5 thru P1_7.

     

    P1_5 is UART0 TX for us.

     

    Could the UART be affecting the radio?

     

  • 0 in reply to Yi Liu67
    TI__Guru**** 317180 points

    As I commented in my last post, something is different when you are doing frequency hopping vs when you are not. Hence you have to check the code and whatever IOs etc you are using to see iif something happens sometimes around the end of the CRC. It could also be a timing issue if the radio start to change channel before Tx is done.

  • 0 in reply to TER
    Prodigy 50 points

    We did use the GPIO to show the timing. Attached is a screen shot of an invalide packet event.

    The top GREEN line shows the channel change.

    The bottom GREEN line shows an invalide packet event.

    As you can see, it is not close the channel switch.

    Another question is how do we interpret the "LQI", and what is a good value. I did a quick test, and the value are always "0xFF" with good packets, and "0x7F" when a packet is bad.

    Thanks,

  • 0 in reply to Yi Liu67
    TI__Guru**** 317180 points

    By first look I can't read from the figure when the channels change and an invalid packet event. Is it when the signal get a transition? If so, it's a few signals that get s a transition before the failure, could they cause an issue?