en:users:drivers:ath9k:btcoex
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en:users:drivers:ath9k:btcoex [2015/08/04 04:48] Sujith Manoharan |
en:users:drivers:ath9k:btcoex [2015/08/04 05:16] (current) Sujith Manoharan |
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| ===== Supported Coexistence Schemes ===== | ===== Supported Coexistence Schemes ===== | ||
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| * [[en/users/Documentation/Bluetooth-coexistence|2-wire]] | * [[en/users/Documentation/Bluetooth-coexistence|2-wire]] | ||
| * [[en/users/Documentation/Bluetooth-coexistence|3-wire]] | * [[en/users/Documentation/Bluetooth-coexistence|3-wire]] | ||
| - | * MCI (Message-Based Coexistence Interface) | + | * MCI (Message-Based Coexistence Interface) |
| + | |||
| ===== Enabling bluetooth coexistence ===== | ===== Enabling bluetooth coexistence ===== | ||
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| * WB197 ( AR9287 + AR3011 ) | * WB197 ( AR9287 + AR3011 ) | ||
| ==== 3-wire (two-chip cards with separate WLAN and BT) ==== | ==== 3-wire (two-chip cards with separate WLAN and BT) ==== | ||
| - | * WB195 ( AR9285 + AR3011 ) | + | * WB195 ( AR9285 + AR3011 ) |
| - | * WB225 ( AR9485 + AR3012 ) | + | * WB225 ( AR9485 + AR3012 ) |
| ==== MCI (SoC-type cards with integrated WLAN and BT) ==== | ==== MCI (SoC-type cards with integrated WLAN and BT) ==== | ||
| - | * WB222 ( based on AR9462 ) | + | * WB222 ( based on AR9462 ) |
| - | * WB335 ( based on AR9565 ) | + | * WB335 ( based on AR9565 ) |
| + | |||
| + | ===== 3-wire scheme details ===== | ||
| + | |||
| + | Some Atheros cards in both the AR9002 and AR9003 family use this scheme in which WLAN and Bluetooth time-shares their usage of the 2.4 GHz band. Three pins are used in this scheme. | ||
| + | |||
| + | ^ PIN ^ Driven by ^ Details ^ | ||
| + | | BT_ACTIVE | BT | Signals that Bluetooth device is expecting TX or RX activity. Provides WLAN with information about when the antenna is being used by Bluetooth. | | ||
| + | | BT_PRIORITY | BT | At the start of BT_ACTIVE, it is asserted to indicate the priority of the Bluetooth activity. Then, this pin indicates the TX/RX status of the Bluetooth activity. | | ||
| + | | WLAN_ACTIVE | WLAN | Indicates when WLAN has taken the antenna. | | ||
| + | |||
| + | ==== PTA (Packet Traffic Arbitration ) Algorithm ==== | ||
| + | |||
| + | BT weights and WLAN weights are programmed in the hardware by the driver. Hardware infers the Bluetooth activity by sampling the BT_ACTIVE signal. Whenever there’s Bluetooth activity, hardware compares the assigned weight of Bluetooth traffic and the current WLAN traffic. If Bluetooth traffic has a lower priority, hardware will continue WLAN traffic, thus stomping on the Bluetooth side (and possible interference on WLAN side as well). If Bluetooth traffic has a higher priority, hardware will abort WLAN traffic and treat it as if there’s collision on-air. | ||
en/users/drivers/ath9k/btcoex.txt · Last modified: 2015/08/04 05:16 by Sujith Manoharan
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