需要使用的函數:HCI_EXT_SetTxPowerCmd()
1)CC2540支持4種發射功率:4dB、0dB(default)、-6dB、-23dB。
2)CC2541支持3種發射功率:0dB(default)、-6dB、-23dB。
txPower - For CC254x: HCI_EXT_TX_POWER_MINUS_23_DBM,
* HCI_EXT_TX_POWER_MINUS_6_DBM,
* HCI_EXT_TX_POWER_0_DBM,
* HCI_EXT_TX_POWER_4_DBM
*
* For CC26xx: HCI_EXT_TX_POWER_MINUS_21_DBM,
* HCI_EXT_TX_POWER_MINUS_18_DBM,
* HCI_EXT_TX_POWER_MINUS_15_DBM,
* HCI_EXT_TX_POWER_MINUS_12_DBM,
* HCI_EXT_TX_POWER_MINUS_9_DBM,
* HCI_EXT_TX_POWER_MINUS_6_DBM,
* HCI_EXT_TX_POWER_MINUS_3_DBM,
* HCI_EXT_TX_POWER_0_DBM,
* HCI_EXT_TX_POWER_1_DBM,
* HCI_EXT_TX_POWER_2_DBM,
* HCI_EXT_TX_POWER_3_DBM,
* HCI_EXT_TX_POWER_4_DBM,
* HCI_EXT_TX_POWER_5_DBM
/**
* @brief Set the transmit power.
*
* The default system value for this feature is @ref HCI_EXT_TX_POWER_0_DBM
*
* @note
* For the CC254x platform, a setting of 4dBm is only allowed for the CC2540.
*
* @par Corresponding Events
* @ref hciEvt_VSCmdComplete_t with cmdOpcode @ref HCI_EXT_SET_TX_POWER
*
* @param txPower - @ref TX_Power
*
* @return @ref HCI_SUCCESS
*/
extern hciStatus_t HCI_EXT_SetTxPowerCmd( uint8 txPower );