Coex support for all chips

[jessebraham]

• ESP32
• ESP32-C2
• ESP32-C3
• ESP32-C6 (*)
• ESP32-H2 (is IEEE802.15.4 / Bluetooth co-existence possible at all?)
• ESP32-S3

(*) needs the big-heap feature (or configuring a big enough wifi heap)

[elpiel]

@bjoernQ not sure what coex is but I noticed you removed a few examples in esp-rs/esp-wifi-sys#166
Is this issues still valid in that case?

[bjoernQ]

@bjoernQ not sure what coex is but I noticed you removed a few examples in esp-rs/esp-wifi-sys#166 Is this issues still valid in that case?

Thanks for pointing this out. coex means co-existence of Bluetooth and WiFi (using it at the same time)

Removing the coex example from ESP32-C6 examples was a mistake but since it's not yet supported, we can re-add it once we add support for it.

[UntakerAnonPLAY]

So current situation means, that it is impossible to use Bluetooth and WiFi at the same time on ESP32 chip? Or is there a way to implement this feature using rust/mixture of rust and c?

[bjoernQ]

So current situation means, that it is impossible to use Bluetooth and WiFi at the same time on ESP32 chip? Or is there a way to implement this feature using rust/mixture of rust and c?

In order to get COEX working we need correct implementations for functions like https://github.com/esp-rs/esp-wifi/blob/ca88c2ef5394bfaf982cec589ff03f90944f9cf3/esp-wifi/src/wifi/mod.rs#L439-L455 and others

IIRC we have some implementations there but just didn't got COEX to work on ESP32

[0xkelvin]

hello @bjoernQ

we tried COEX on esp32c6, basically we ported coex from c3, we got the panic as below :

it seems the problem is comes from libcoexist.a

we are very keen to use esp32c6 for our telematic project, it is great if we can support and guidance to make it work

thanks

[bjoernQ]

Seems like it doesn't like the config in src\ble\os_adapter_esp32c6.rs - you can double check it comparing to ESP-IDF's components\bt\include\esp32c6\include\esp_bt.h

I think I already spotted a difference in rtc_freq which should be 16000 but currently it's configured to 32000 (probably copy-paste error). I could imagine the driver won't use it without COEX

Unfortunately, the error code is not documented but even if it was it would probably be a generic ILLEGAL_ARGUMENT kind of error.

[TuEmb]

Hi @bjoernQ ,

It seems like the above error doesn't occur after I double check with ESP-IDF's components\bt\include\esp32c6\include\esp_bt.h and set the config for bt in src\ble\os_adapter_esp32c6.rs

pub(crate) static BLE_CONFIG: esp_bt_controller_config_t = esp_bt_controller_config_t {
    config_version: 0x20230113,
    ble_ll_resolv_list_size: 4,
    ble_hci_evt_hi_buf_count: 30,
    ble_hci_evt_lo_buf_count: 8,
    ble_ll_sync_list_cnt: 5,
    ble_ll_sync_cnt: 1,
    ble_ll_rsp_dup_list_count: 20,
    ble_ll_adv_dup_list_count: 20,
    ble_ll_tx_pwr_dbm: 9,
    rtc_freq: 32000,
    ble_ll_sca: 60,
    ble_ll_scan_phy_number: 1,
    ble_ll_conn_def_auth_pyld_tmo: 3000,
    ble_ll_jitter_usecs: 16,
    ble_ll_sched_max_adv_pdu_usecs: 376,
    ble_ll_sched_direct_adv_max_usecs: 502,
    ble_ll_sched_adv_max_usecs: 852,
    ble_scan_rsp_data_max_len: 31,
    ble_ll_cfg_num_hci_cmd_pkts: 1,
    ble_ll_ctrl_proc_timeout_ms: 40000,
    nimble_max_connections: 2,
    ble_whitelist_size: 12,
    ble_acl_buf_size: 255,
    ble_acl_buf_count: 24,
    ble_hci_evt_buf_size: 70,
    ble_multi_adv_instances: 1,
    ble_ext_adv_max_size: 31,
    controller_task_stack_size: 4096,
    controller_task_prio: 253,
    controller_run_cpu: 0,
    enable_qa_test: 0,
    enable_bqb_test: 0,
    enable_uart_hci: 0,
    ble_hci_uart_port: 0,
    ble_hci_uart_baud: 0,
    ble_hci_uart_data_bits: 0,
    ble_hci_uart_stop_bits: 0,
    ble_hci_uart_flow_ctrl: 0,
    ble_hci_uart_uart_parity: 0,
    enable_tx_cca: 0,
    cca_rssi_thresh: (256 - 50) as u8,
    sleep_en: 0,
    coex_phy_coded_tx_rx_time_limit: 0,
    dis_scan_backoff: 0,
    ble_scan_classify_filter_enable: 1,
    cca_drop_mode: 0,  //???
    cca_low_tx_pwr: 0, //???
    main_xtal_freq: 40,
    ignore_wl_for_direct_adv: 0,
    config_magic: 0x5A5AA5A5,

    cpu_freq_mhz: 160,
    enable_pcl: 0, // CONFIG_BT_LE_POWER_CONTROL_ENABLED
    version_num: 0,
};

However wifi can't scan and return an error like below picture. Bluetooth is not started advertising and still wait for wifi works properly. Could you help me check with the my logs ?

[bjoernQ]

Nice! Error 12300 is ESP_ERR_WIFI_TIMEOUT - would be interesting if advertising works when you comment out waiting for the wifi connection etc.

Are the functions in G_COEX_FUNCS actually called? Might be worth to double check their implementation with ESP-IDF.
Maybe enabling/disabling of Bluetooth vs WiFi isn't working so the WiFi tries to scan but the hardware isn't active

[TuEmb]

Hi @bjoernQ ,

After comparing with ESP-IDF and add G_COEX_FUNCS, I updated the configuration. Wifi already works, but I got an issue with Bluetooth. The function ble_hci_trans_hs_cmd_tx returned 1082268952. I found this function in libbt.a, and it seems like the Rust code didn't call this function correctly.

I guess the code is calling un-correct function, not in libbt.a

[TuEmb]

After a lot of workaround, I also face the issue related to r_ble_hci_ram_hs_cmd_tx, This issue also noted in npl.rs
It seems Wifi can work in Coex, but Bluetooth is having issue.

[bjoernQ]

Does increasing the delay change anything?

[TuEmb]

I tried to increase to 100_000 , 1_000_000, 10_000_000. But still can't

[bjoernQ]

Is that branch available somewhere? Maybe I can have a peek at it

[TuEmb]

Hi @bjoernQ ,

I have created a draft PR at esp-rs/esp-wifi-sys#300

Could you help me review it ?

[jessebraham]

This issue is quite old, and I'm not sure there's any work left to do here, so I will close this. @bjoernQ when you're back from vacation, if anything is actually required for the ESP32-H2 could you please open a new issue with some details?