[参考译文] CC1311P3：在切换不同功率级别的 PA 时出现问题

下面是用于设置 Tx 功率的代码块。  它用在我们的射频驱动器胶合层中。

void RF_SetPower(int16_t power_dbmx10)
{   // The RF library provides a discrete RF_setTxPower() function which can
    // be used directly instead of injecting the data into the
    // RF_cmdPropRadioDivSetup object.  This is convenient since we typically
    // just set that object once at init.
    
    // Starting with this version of the radio, region max power levels
    // are absolute (based on regional requirement, not hardware limitations).
    // Therefore, restrict requested power to max supported in the table.
    // Also, only deal with whole number values (no decimal)
    int8_t power_dbm = power_dbmx10 / 10;
    if(power_dbm > 20)
        power_dbm = 20;
    
    // Find the selected power setting in the power table
    // The table supports 1 dBm increments.  However, finer granularity could
    // be had by manually adjusting the RF_TxPowerTable_Value parameters
    RF_TxPowerTable_Value power_value = RF_TxPowerTable_findValue(txPowerTable_868_pa13_20, power_dbm);
    if(power_value.rawValue != RF_TxPowerTable_INVALID_VALUE)
        RF_setTxPower(RF_ObjPtr, power_value);

// *** Below chunk is for power compensation testing ***
    // // Override the default PA values to test if we can get more...
    // // bias, ibboost, boost, coefficient, ldotrim
    // // Testing at 900 MHz:
    // // 18, 3, 0, 71, 27 -> 18.84 dBm
    // // 19.2 dBm with max bias and the rest left alone
    // uint8_t bias = 18;          // 18, 6 bits
    // uint8_t ibboost = 3;        // 3, 2 bits
    // uint8_t boost = 0;          // 0, 1 bit (low / high drive)
    // uint8_t temp_coeff = 71;    // 71, 7 bits
    // uint8_t ldotrim = 27;       // 27, 6 bits

    // // The manual's formula implies bias increase as temperature increases
    // int8_t temp = 25; // °C
    // bias = bias + (((temp - 25) * temp_coeff) / 256);

    // RF_TxPowerTable_Value power_value = RF_TxPowerTable_HIGH_PA_ENTRY(bias, ibboost, boost, temp_coeff, ldotrim);
    // RF_setTxPower(RF_ObjPtr, power_value);
// ***

    // The selected Tx Power will not take effect until the next transmission.
    // So, if we are performing a Tx Test, automatically restart it.
    if(RF_OpState == RF_State_TxTest)
        RF_TxTest(RF_OpTxTestMode);
}

对强制 VDDR 的深思熟虑。  我忘记了这个选项。  我们有引导加载程序和应用程序、CCFG 已加载引导加载程序、但在 CCFG 中未设置 Force VDDR。  我明天会尝试启用它。

我使用直接连接到频谱分析仪的电缆测量输出功率。  当设置为20dBm 时、我的测量值为18.5dBm、这是合理/良好的。  低功耗的问题是、当我将功率设置为14dBm 时我们只能得到10dBm 或8dBm (我预计损耗为1-2dBm、而不是4-6dBm)。

我明天还将再次查看 LP 套件。  我昨天跑了很久、今天就不在办公室了。