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以TI公司的CC2540为例，它支持4种发射功率选择：4dBm、0dBm、-6dBm和-23dBm，按无线电功率定义：LdBm=10lg(Pwr/1mW)，以上4种分贝值换算成瓦特为：2.51mW、1mW、0.251mW和0.005mW，有效通信距离分别为：30米、10米、7米和3米。
如何在BLE 中设定外设或集中器的发射功率呢？ 默认值是多少？在哪里可以找到
/******************************************************************************* * @fn HCI_EXT_SetTxPowerCmd API * * @brief This HCI Extension API is used to set the transmit power. * * Related Events: HCI_VendorSpecifcCommandCompleteEvent * * input parameters * * @param txPower - LL_EXT_TX_POWER_MINUS_23_DBM, * LL_EXT_TX_POWER_MINUS_6_DBM, * LL_EXT_TX_POWER_0_DBM, * LL_EXT_TX_POWER_4_DBM * * output parameters * * @param None. * * @return hciStatus_t */extern hciStatus_t HCI_EXT_SetTxPowerCmd( uint8 txPower );
