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Krzysztof Budzynski 2022-05-07 16:21:06 +08:00 committed by Mu Hai Dong
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docs/en/api-guides/wifi.rst
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@ -1672,7 +1672,7 @@ The Wi-Fi multiple antennas selecting can be depicted as following picture::
Up to four GPIOs are connected to the four active high antenna_select pins. {IDF_TARGET_NAME} can select the antenna by control the GPIO[0:3]. The API :cpp:func:`esp_wifi_set_ant_gpio()` is used to configure which GPIOs are connected to antenna_selects. If GPIO[x] is connected to antenna_select[x], then gpio_config->gpio_cfg[x].gpio_select should be set to 1 and gpio_config->gpio_cfg[x].gpio_num should be provided.
For the specific implementation of Antenna Switch, there may be illegal values in antenna_select[0:3]. Which means that {IDF_TARGET_NAME} may supports less then sixteen antennas through external antenna switch. For example, ESP32-WROOM-DA supports two antennas which uses RTC6603SP as Antenna Switch. Two GPIOs are connected to the two active high antenna_select pins. The value '0b00' and '0b11' are illegal values, the value '0b01' means the antenna 0 is selected, the value '0b10' means the antenna 1 is selected.
For the specific implementation of the antenna switch, there may be illegal values in `antenna_select[0:3]`. It means that {IDF_TARGET_NAME} may support less than sixteen antennas through the switch. For example, ESP32-WROOM-DA which uses RTC6603SP as the antenna switch, supports two antennas. Two GPIOs are connected to two active high antenna selection inputs. The value '0b01' means the antenna 0 is selected, the value '0b10' means the antenna 1 is selected. Values '0b00' and '0b11' are illegal.
Although up to sixteen antennas are supported, only one or two antennas can be simultaneously enabled for RX/TX. The API :cpp:func:`esp_wifi_set_ant()` is used to configure which antennas are enabled.