Hi,
We developed a custom board based on CC1352P.
For Sub 1Ghz we use the following radio settings:
// Frequency: 868.00000 MHz
// Data Format: Serial mode disable
// Deviation: 5.000 kHz
// Packet Length Config: Variable
// Max Packet Length: 255
// Packet Length: 20
// Packet Data: 255
// Preamble Count: 4 Bytes
// Preamble Mode: Send 0 as the first preamble bit
// RX Filter BW: 34.1 kHz
// Symbol Rate: 19.99969 kBaud
// Sync Word: 0x930b51de
According to the document "Finding Settings for new PHYs for the CC13xx Family" ,
The recommended RX BW :
RX BW > SBW + 4∗XTALppm∗fRF
Our crystal accuracy is 10ppm , So the recommended RX filter BW should be 30Khz + 34Khz = 64kHz , and not 34.1kHz we use today.
Since our device is already in production, my question is:
Is there any drawback to increasing RX filter to 68.3kHz ( Nearest to 64kHz) ?
0827.ti_radio_config.c
//*********************************************************************************
// Generated by SmartRF Studio version 2.30.0 (build#397)
// The applied template is compatible with cc13x2_26x2 SDK version 2.30.xx.xx or newer.
// Device: CC1352P Rev. E (2.1).
//
//*********************************************************************************
//*********************************************************************************
// Parameter summary
// RX Address0: 0xAA
// RX Address1: 0xBB
// RX Address Mode: No address check
// Frequency: 868.00000 MHz
// Data Format: Serial mode disable
// Deviation: 5.000 kHz
// Packet Length Config: Variable
// Max Packet Length: 255
// Packet Length: 20
// Packet Data: 255
// Preamble Count: 4 Bytes
// Preamble Mode: Send 0 as the first preamble bit
// RX Filter BW: 34.1 kHz
// Symbol Rate: 19.99969 kBaud
// Sync Word: 0x930b51de
// Sync Word Length: 32 Bits
// TX Power: 20 dBm
// Enable high output power PA: true
// Whitening: CC1101/CC2500 compatible
#include "smartrf_settings_Standard.h"
#include DeviceFamily_constructPath(rf_patches/rf_patch_cpe_prop.h)
// TI-RTOS RF Mode Object
RF_Mode RF_prop =
{
.rfMode = RF_MODE_AUTO,
.cpePatchFxn = &rf_patch_cpe_prop,
.mcePatchFxn = 0,
.rfePatchFxn = 0
};
// TX Power table
// The macros RF_TxPowerTable_DEFAULT_PA_ENTRY/RF_TxPowerTable_HIGH_PA_ENTRY/RF_TxPowerTable_CC13x4Sub1GHz_DEFAULT_PA_ENTRY are defined in RF.h.
// The following arguments are required:
// RF_TxPowerTable_DEFAULT_PA_ENTRY(bias, gain, boost coefficient)
// RF_TxPowerTable_HIGH_PA_ENTRY(bias, ibboost, boost, coefficient, ldoTrim)
// See the Technical Reference Manual for further details about the "txPower" Command field.
// The PA settings require the CCFG_FORCE_VDDR_HH = 0 unless stated otherwise.
RF_TxPowerTable_Entry txPowerTable[TX_POWER_TABLE_SIZE] =
{
{-20, RF_TxPowerTable_DEFAULT_PA_ENTRY(0, 3, 0, 2) }, // 0x04C0
{-15, RF_TxPowerTable_DEFAULT_PA_ENTRY(1, 3, 0, 3) }, // 0x06C1
{-10, RF_TxPowerTable_DEFAULT_PA_ENTRY(2, 3, 0, 5) }, // 0x0AC2
{-7, RF_TxPowerTable_DEFAULT_PA_ENTRY(3, 3, 0, 5) }, // 0x0AC3
{-5, RF_TxPowerTable_DEFAULT_PA_ENTRY(4, 3, 0, 5) }, // 0x0AC4
{-3, RF_TxPowerTable_DEFAULT_PA_ENTRY(5, 3, 0, 6) }, // 0x0CC5
{0, RF_TxPowerTable_DEFAULT_PA_ENTRY(8, 3, 0, 8) }, // 0x10C8
{1, RF_TxPowerTable_DEFAULT_PA_ENTRY(9, 3, 0, 9) }, // 0x12C9
{2, RF_TxPowerTable_DEFAULT_PA_ENTRY(10, 3, 0, 9) }, // 0x12CA
{3, RF_TxPowerTable_DEFAULT_PA_ENTRY(11, 3, 0, 10) }, // 0x14CB
{4, RF_TxPowerTable_DEFAULT_PA_ENTRY(13, 3, 0, 11) }, // 0x16CD
{5, RF_TxPowerTable_DEFAULT_PA_ENTRY(14, 3, 0, 14) }, // 0x1CCE
{6, RF_TxPowerTable_DEFAULT_PA_ENTRY(17, 3, 0, 16) }, // 0x20D1
{7, RF_TxPowerTable_DEFAULT_PA_ENTRY(20, 3, 0, 19) }, // 0x26D4
{8, RF_TxPowerTable_DEFAULT_PA_ENTRY(24, 3, 0, 22) }, // 0x2CD8
{9, RF_TxPowerTable_DEFAULT_PA_ENTRY(28, 3, 0, 31) }, // 0x3EDC
{10, RF_TxPowerTable_DEFAULT_PA_ENTRY(18, 2, 0, 31) }, // 0x3E92
{11, RF_TxPowerTable_DEFAULT_PA_ENTRY(26, 2, 0, 51) }, // 0x669A
{12, RF_TxPowerTable_DEFAULT_PA_ENTRY(16, 0, 0, 82) }, // 0xA410
// The original PA value (12.5 dBm) has been rounded to an integer value.
{13, RF_TxPowerTable_DEFAULT_PA_ENTRY(36, 0, 0, 89) }, // 0xB224
// This setting requires CCFG_FORCE_VDDR_HH = 1.
{14, RF_TxPowerTable_DEFAULT_PA_ENTRY(63, 0, 1, 0) }, // 0x013F
{15, RF_TxPowerTable_HIGH_PA_ENTRY(18, 0, 0, 36, 0) }, // 0x004812
{16, RF_TxPowerTable_HIGH_PA_ENTRY(24, 0, 0, 43, 0) }, // 0x005618
{17, RF_TxPowerTable_HIGH_PA_ENTRY(28, 0, 0, 51, 2) }, // 0x02661C
{18, RF_TxPowerTable_HIGH_PA_ENTRY(34, 0, 0, 64, 4) }, // 0x048022
{19, RF_TxPowerTable_HIGH_PA_ENTRY(15, 3, 0, 36, 4) }, // 0x0448CF
{20, RF_TxPowerTable_HIGH_PA_ENTRY(18, 3, 0, 71, 27) }, // 0x1B8ED2
RF_TxPowerTable_TERMINATION_ENTRY
};
// Overrides for CMD_PROP_RADIO_DIV_SETUP_PA
uint32_t pOverrides[] =
{
// override_tc706.xml
// Tx: Configure PA ramp time, PACTL2.RC=0x3 (in ADI0, set PACTL2[4:3]=0x3)
ADI_2HALFREG_OVERRIDE(0,16,0x8,0x8,17,0x1,0x1),
// Rx: Set AGC reference level to 0x1A (default: 0x2E)
HW_REG_OVERRIDE(0x609C,0x001A),
// Rx: Set RSSI offset to adjust reported RSSI by -1 dB (default: -2), trimmed for external bias and differential configuration
(uint32_t)0x000188A3,
// Rx: Set anti-aliasing filter bandwidth to 0xD (in ADI0, set IFAMPCTL3[7:4]=0xD)
ADI_HALFREG_OVERRIDE(0,61,0xF,0xD),
// override_prop_common_sub1g.xml
// Set RF_FSCA.ANADIV.DIV_SEL_BIAS = 1. Bits [0:16, 24, 30] are don't care..
(uint32_t)0x4001405D,
// Set RF_FSCA.ANADIV.DIV_SEL_BIAS = 1. Bits [0:16, 24, 30] are don't care..
(uint32_t)0x08141131,
// override_prop_common.xml
// DC/DC regulator: In Tx with 14 dBm PA setting, use DCDCCTL5[3:0]=0xF (DITHER_EN=1 and IPEAK=7). In Rx, use default settings.
(uint32_t)0x00F788D3,
(uint32_t)0xFFFFFFFF
};
// Overrides for CMD_PROP_RADIO_DIV_SETUP_PA
uint32_t pOverridesTxStd[] =
{
// The TX Power element should always be the first in the list
TX_STD_POWER_OVERRIDE(0x013F),
// The ANADIV radio parameter based on the LO divider (0) and front-end (0) settings
(uint32_t)0x11310703,
// override_phy_tx_pa_ramp_genfsk_std.xml
// Tx: Configure PA ramping, set wait time before turning off (0x1A ticks of 16/24 us = 17.3 us).
HW_REG_OVERRIDE(0x6028,0x001A),
// Set TXRX pin to 0 in RX and high impedance in idle/TX.
HW_REG_OVERRIDE(0x60A8,0x0401),
(uint32_t)0xFFFFFFFF
};
// Overrides for CMD_PROP_RADIO_DIV_SETUP_PA
uint32_t pOverridesTx20[] =
{
// The TX Power element should always be the first in the list
TX20_POWER_OVERRIDE(0x001B8ED2),
// The ANADIV radio parameter based on the LO divider (0) and front-end (0) settings
(uint32_t)0x11C10703,
// override_phy_tx_pa_ramp_genfsk_hpa.xml
// Tx: Configure PA ramping, set wait time before turning off (0x1F ticks of 16/24 us = 20.3 us).
HW_REG_OVERRIDE(0x6028,0x001F),
// Set TXRX pin to 0 in RX/TX and high impedance in idle.
HW_REG_OVERRIDE(0x60A8,0x0001),
(uint32_t)0xFFFFFFFF
};
// CMD_PROP_RADIO_DIV_SETUP_PA
// Proprietary Mode Radio Setup Command for All Frequency Bands
rfc_CMD_PROP_RADIO_DIV_SETUP_PA_t RF_cmdPropRadioDivSetup =
{
.commandNo = 0x3807,
.status = 0x0000,
.pNextOp = 0, // INSERT APPLICABLE POINTER: (uint8_t*)&xxx
.startTime = 0x00000000,
.startTrigger.triggerType = 0x0,
.startTrigger.bEnaCmd = 0x0,
.startTrigger.triggerNo = 0x0,
.startTrigger.pastTrig = 0x0,
.condition.rule = 0x1,
.condition.nSkip = 0x0,
.modulation.modType = 0x1,
.modulation.deviation = 0x14,
.modulation.deviationStepSz = 0x0,
.symbolRate.preScale = 0xF,
.symbolRate.rateWord = 0x3333,
.symbolRate.decimMode = 0x0,
.rxBw = 0x4C,
.preamConf.nPreamBytes = 0x4,
.preamConf.preamMode = 0x0,
.formatConf.nSwBits = 0x20,
.formatConf.bBitReversal = 0x0,
.formatConf.bMsbFirst = 0x1,
.formatConf.fecMode = 0x0,
.formatConf.whitenMode = 0x1,
.config.frontEndMode = 0x0,
.config.biasMode = 0x1,
.config.analogCfgMode = 0x0,
.config.bNoFsPowerUp = 0x0,
.config.bSynthNarrowBand = 0x0,
.txPower = 0xFFFF,
.pRegOverride = pOverrides,
.centerFreq = 0x0364,
.intFreq = 0x8000,
.loDivider = 0x05,
.pRegOverrideTxStd = pOverridesTxStd,
.pRegOverrideTx20 = pOverridesTx20
};
// CMD_FS
// Frequency Synthesizer Programming Command
rfc_CMD_FS_t RF_cmdFs =
{
.commandNo = 0x0803,
.status = 0x0000,
.pNextOp = 0, // INSERT APPLICABLE POINTER: (uint8_t*)&xxx
.startTime = 0x00000000,
.startTrigger.triggerType = 0x0,
.startTrigger.bEnaCmd = 0x0,
.startTrigger.triggerNo = 0x0,
.startTrigger.pastTrig = 0x0,
.condition.rule = 0x1,
.condition.nSkip = 0x0,
.frequency = 0x0364,
.fractFreq = 0x0000,
.synthConf.bTxMode = 0x0,
.synthConf.refFreq = 0x0,
.__dummy0 = 0x00,
.__dummy1 = 0x00,
.__dummy2 = 0x00,
.__dummy3 = 0x0000
};
// CMD_PROP_RX
// Proprietary Mode Receive Command
rfc_CMD_PROP_RX_t RF_cmdPropRx =
{
.commandNo = 0x3802,
.status = 0x0000,
.pNextOp = 0, // INSERT APPLICABLE POINTER: (uint8_t*)&xxx
.startTime = 0x00000000,
.startTrigger.triggerType = 0x0,
.startTrigger.bEnaCmd = 0x0,
.startTrigger.triggerNo = 0x0,
.startTrigger.pastTrig = 0x0,
.condition.rule = 0x1,
.condition.nSkip = 0x0,
.pktConf.bFsOff = 0x0,
.pktConf.bRepeatOk = 0x0,
.pktConf.bRepeatNok = 0x0,
.pktConf.bUseCrc = 0x1,
.pktConf.bVarLen = 0x1,
.pktConf.bChkAddress = 0x0,
.pktConf.endType = 0x0,
.pktConf.filterOp = 0x0,
.rxConf.bAutoFlushIgnored = 0x0,
.rxConf.bAutoFlushCrcErr = 0x0,
.rxConf.bIncludeHdr = 0x1,
.rxConf.bIncludeCrc = 0x0,
.rxConf.bAppendRssi = 0x0,
.rxConf.bAppendTimestamp = 0x0,
.rxConf.bAppendStatus = 0x1,
.syncWord = 0x930B51DE,
.maxPktLen = 0xFF,
.address0 = 0xAA,
.address1 = 0xBB,
.endTrigger.triggerType = 0x1,
.endTrigger.bEnaCmd = 0x0,
.endTrigger.triggerNo = 0x0,
.endTrigger.pastTrig = 0x0,
.endTime = 0x00000000,
.pQueue = 0, // INSERT APPLICABLE POINTER: (dataQueue_t*)&xxx
.pOutput = 0 // INSERT APPLICABLE POINTER: (uint8_t*)&xxx
};
// CMD_PROP_TX
// Proprietary Mode Transmit Command
rfc_CMD_PROP_TX_t RF_cmdPropTx =
{
.commandNo = 0x3801,
.status = 0x0000,
.pNextOp = 0, // INSERT APPLICABLE POINTER: (uint8_t*)&xxx
.startTime = 0x00000000,
.startTrigger.triggerType = 0x0,
.startTrigger.bEnaCmd = 0x0,
.startTrigger.triggerNo = 0x0,
.startTrigger.pastTrig = 0x0,
.condition.rule = 0x1,
.condition.nSkip = 0x0,
.pktConf.bFsOff = 0x0,
.pktConf.bUseCrc = 0x1,
.pktConf.bVarLen = 0x1,
.pktLen = 0x14,
.syncWord = 0x930B51DE,
.pPkt = 0 // INSERT APPLICABLE POINTER: (uint8_t*)&xxx
};
