一、背景
1.1 發射功率範圍
(最大)5dB、4dB、3dB、2dB、1dB、(預設)0dB、-3dB、-6dB、-9dB、-12dB、-15dB、-18dB、(最小)-21dB
#define HCI_EXT_TX_POWER_MINUS_21_DBM LL_EXT_TX_POWER_MINUS_21_DBM //!< -21 dBm
#define HCI_EXT_TX_POWER_MINUS_18_DBM LL_EXT_TX_POWER_MINUS_18_DBM //!< -18 dBm
#define HCI_EXT_TX_POWER_MINUS_15_DBM LL_EXT_TX_POWER_MINUS_15_DBM //!< -15 dBm
#define HCI_EXT_TX_POWER_MINUS_12_DBM LL_EXT_TX_POWER_MINUS_12_DBM //!< -12 dBm
#define HCI_EXT_TX_POWER_MINUS_9_DBM LL_EXT_TX_POWER_MINUS_9_DBM //!< 9 dBm
#define HCI_EXT_TX_POWER_MINUS_6_DBM LL_EXT_TX_POWER_MINUS_6_DBM //!< 6 dBm
#define HCI_EXT_TX_POWER_MINUS_3_DBM LL_EXT_TX_POWER_MINUS_3_DBM //!< 3 dBm
#define HCI_EXT_TX_POWER_0_DBM LL_EXT_TX_POWER_0_DBM //!< 0 dBm
#define HCI_EXT_TX_POWER_1_DBM LL_EXT_TX_POWER_1_DBM //!< 1 dBm
#define HCI_EXT_TX_POWER_2_DBM LL_EXT_TX_POWER_2_DBM //!< 2 dBm
#define HCI_EXT_TX_POWER_3_DBM LL_EXT_TX_POWER_3_DBM //!< 3 dBm
#define HCI_EXT_TX_POWER_4_DBM LL_EXT_TX_POWER_4_DBM //!< 4 dBm
#define HCI_EXT_TX_POWER_5_DBM LL_EXT_TX_POWER_5_DBM //!< 5 dBm
1.2 發射功率作用
發射功率越大,信号越強,距離越遠,功耗越大。
發射功率越小,信号越弱,距離越近,功耗越小。
發射功率隻是影響通信距離的因素之一,通信距離還與環境、天線選型、天線電路比對等因素有關。
二、使用方法
以SDK2.4 multi_role工程為例,在multi_role.c中需要調整發射功率的地方加入以下其中一條
//設定發射功率(預設-47dB~-51dB)
//HCI_EXT_SetTxPowerCmd(HCI_EXT_TX_POWER_MINUS_21_DBM); //-71dB~-76dB
//HCI_EXT_SetTxPowerCmd(HCI_EXT_TX_POWER_MINUS_18_DBM); //-65dB~-72dB
//HCI_EXT_SetTxPowerCmd(HCI_EXT_TX_POWER_MINUS_15_DBM); //-62dB~-67dB
//HCI_EXT_SetTxPowerCmd(HCI_EXT_TX_POWER_MINUS_12_DBM); //-60dB~-63dB
//HCI_EXT_SetTxPowerCmd(HCI_EXT_TX_POWER_MINUS_9_DBM); //-57dB~-61dB
//HCI_EXT_SetTxPowerCmd(HCI_EXT_TX_POWER_MINUS_6_DBM); //-54dB~-59dB
//HCI_EXT_SetTxPowerCmd(HCI_EXT_TX_POWER_MINUS_3_DBM); //-50dB~-53dB
//HCI_EXT_SetTxPowerCmd(HCI_EXT_TX_POWER_0_DBM); //-46dB~-50dB
//HCI_EXT_SetTxPowerCmd(HCI_EXT_TX_POWER_1_DBM); //-45dB~-50dB
//HCI_EXT_SetTxPowerCmd(HCI_EXT_TX_POWER_2_DBM); //-43dB~-47dB
//HCI_EXT_SetTxPowerCmd(HCI_EXT_TX_POWER_3_DBM); //-42dB~-47dB
//HCI_EXT_SetTxPowerCmd(HCI_EXT_TX_POWER_4_DBM); //-41dB~-45dB
//HCI_EXT_SetTxPowerCmd(HCI_EXT_TX_POWER_5_DBM); //-41dB~-44dB
• 由 Leung 寫于 2019 年 3 月 30 日
• 參考:【CC2640R2F】香瓜CC2640R2F之修改發射功率