CCS/CC2652R: How to fix Master/Passive LNA gain and Slave TX power

Valery Wu

Part Number: CC2652R
Other Parts Discussed in Thread: SYSCONFIG

Tool/software: Code Composer Studio

Hi Ti,

As question of https://e2e.ti.com/support/wireless-connectivity/bluetooth/f/538/t/895444?keyMatch=VALERY&tisearch=Search-EN-everything

The amplitude of IQ will have a fluctuating range may also caused by LNA gain or TX power switch.

I have modify configuration to fix gain and power, but useless. Can you help to check if my change is correct to meet above requirement

1. fix Passive RX LNA gain(urfc.c)

regOverride_t pOverridesCommon[] = {
    0x00158000, // S2RCFG: Capture S2R from FrontEnd, on event (CM0 will arm)
    0x000E51D0, // After FRAC
    ((CTECONFIG << 16) | 0x8BB3), // Enable CTE capture
    ((CTEOFFSET << 24) | ((CTE_SAMPLING_CONFIG | (CTE_SAMPLING_CONFIG << 4)) << 16) | 0x0BC3), // Sampling rate, offset
    0xC0040341, // Pointer to antenna switching table in next entry
    (uint32_t) antSwitching, // Pointer to antenna switching table
     END_OVERRIDE };

   regOverride_t pOverrides1Mbps[] = {
     HW_REG_OVERRIDE(0x6098,0x35FF), // Force high gain setting
     END_OVERRIDE };

   #if defined(BLE_V50_FEATURES) && (BLE_V50_FEATURES & (PHY_2MBPS_CFG | PHY_LR_CFG))
   regOverride_t pOverrides2Mbps[] = {
     END_OVERRIDE };

   regOverride_t pOverridesCoded[] = {
     END_OVERRIDE };
   #endif // PHY_2MBPS_CFG | PHY_LR_CFG

2. fix Slave TX power

(ble_user_config.c)

#define DEFAULT_TX_POWER HCI_EXT_TX_POWER_0_DBM 0

(ti_radio_config.h)

#define RF_BLE_TX_POWER_TABLE_SIZE 16 2

(ti_radio_config.c)

RF_TxPowerTable_Entry RF_BLE_txPowerTable[RF_BLE_TX_POWER_TABLE_SIZE] =
{
    {-20, RF_TxPowerTable_DEFAULT_PA_ENTRY(6, 3, 0, 2) },
    {-18, RF_TxPowerTable_DEFAULT_PA_ENTRY(8, 3, 0, 3) },
    {-15, RF_TxPowerTable_DEFAULT_PA_ENTRY(10, 3, 0, 3) },
    {-12, RF_TxPowerTable_DEFAULT_PA_ENTRY(12, 3, 0, 5) },
    {-10, RF_TxPowerTable_DEFAULT_PA_ENTRY(15, 3, 0, 5) },
    {-9, RF_TxPowerTable_DEFAULT_PA_ENTRY(16, 3, 0, 5) },
    {-6, RF_TxPowerTable_DEFAULT_PA_ENTRY(20, 3, 0, 8) },
    {-5, RF_TxPowerTable_DEFAULT_PA_ENTRY(22, 3, 0, 9) },
    {-3, RF_TxPowerTable_DEFAULT_PA_ENTRY(19, 2, 0, 12) },
    {0, RF_TxPowerTable_DEFAULT_PA_ENTRY(19, 1, 0, 20) },
    {1, RF_TxPowerTable_DEFAULT_PA_ENTRY(22, 1, 0, 20) },
    {2, RF_TxPowerTable_DEFAULT_PA_ENTRY(25, 1, 0, 25) },
    {3, RF_TxPowerTable_DEFAULT_PA_ENTRY(29, 1, 0, 28) },
    {4, RF_TxPowerTable_DEFAULT_PA_ENTRY(35, 1, 0, 39) },
    {5, RF_TxPowerTable_DEFAULT_PA_ENTRY(23, 0, 0, 57) },
    RF_TxPowerTable_TERMINATION_ENTRY
};

over 5 years ago

0 Evan W over 5 years ago

TI__Mastermind 39610 points

Hi Valery,

Change 1 looks correct. Make sure you have recompiled the stack before flashing. I will say that modifying the AGC gain will not fix the observation that you've seen as there will be a natural different in IQ magnitude on each antenna as I've explained in some of your other posts.

I'm not sure why you needed to modify the power table. If you assign the TX power to something, like HCI_EXT_TX_POWER_0_DBM, it will remain static.

You can find the power levels that we support for our devices here and recommend not modifying the code that defines this table.

http://dev.ti.com/tirex/content/simplelink_cc13x2_26x2_sdk_3_40_00_02/docs/ble5stack/ble_user_guide/doxygen/ble/html/group___t_x___power.html#gae78771718e0e8fdc66f5a35fa3758bcc

The API used to set TX power is the following:

http://dev.ti.com/tirex/content/simplelink_cc13x2_26x2_sdk_3_40_00_02/docs/ble5stack/ble_user_guide/doxygen/ble/html/group___h_c_i.html#gafb44c5a388a047db7c3c4d0a4ac57320

0 Valery Wu over 5 years ago in reply to Evan W

Expert 1100 points

thank you Evan.

Do you mean original power configuration is set to a default value like this?

(ble_user_config.c)

#define DEFAULT_TX_POWER HCI_EXT_TX_POWER_0_DBM

// Tx Power Table
txPwrTbl_t appTxPwrTbl = {
                           (txPwrVal_t*)RF_BLE_txPowerTable,
                           NUM_TX_POWER_VALUES, // max
                           DEFAULT_TX_POWER};    // default

0 Clément over 5 years ago in reply to Valery Wu

TI__Guru** 101450 points

Hi Valery,

You have found the right code but keep in mind that the TX Power cannot be changed directly in ble_user_config.c. You have to use SysConfig (recommended) or disable SysConfig (non-recommended, the procedure is described in the BLE Stack User's Guide).

I hope this will help,

Regards,

0 Valery Wu over 5 years ago in reply to Clément

Expert 1100 points

Hi Clément,

thank you, i can see TX power configuration in SysConfig.

Make sure again, TX power of Slave is static. am i right

0 Clément over 5 years ago in reply to Valery Wu

TI__Guru** 101450 points

Hi,

Yes, TX power is constant when fixed using SysConfig.

FYI, TX Power can be dynamically modified using the HCI_EXT_SetTxPowerCmd() power.

Best regards,

0 Valery Wu over 5 years ago in reply to Clément

Expert 1100 points

thank you, Clément

0 Rajapatel over 5 years ago in reply to Clément

Intellectual 380 points

I am also trying to Port my release code with new SDK - so facing some error

I am not using SysConfig

Please suggest ..

0 Clément over 5 years ago in reply to Rajapatel

TI__Guru** 101450 points

Rajapatel said:

I am also trying to Port my release code with new SDK - so facing some error

I am not using SysConfig

Please suggest ..

Hi,

This message is not related to the initial question asked in this thread. To keep the forum easy to read, please open a new thread.

Kind regards,

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CCS/CC2652R: How to fix Master/Passive LNA gain and Slave TX power