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fix(ulp): fix lp uart keep wakeup triggered

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This commit is contained in:
hebinglin
2026-06-05 20:01:15 +08:00
parent ddf8cc3626
commit 46ff88717c
14 changed files with 57 additions and 29 deletions
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6
docs/en/api-reference/system/sleep_modes.rst
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@@ -454,9 +454,11 @@ The UART wakeup supports the following modes:
#. Initialize the LP UART (call :cpp:func:`lp_core_uart_init`).
#. Configure the LP_UART wakeup mode using the :cpp:func:`lp_core_uart_wakeup_setup` function with a :cpp:type:`uart_wakeup_cfg_t` structure, using the same configuration method as HP UART.
.. note::
.. only:: SOC_LP_CORE_LP_UART_WAKEUP_KEEP_TRIGGERED
Once the LP core wakes up due to LP_UART, you must call :cpp:func:`ulp_lp_core_lp_uart_reset_wakeup_en` or reset the LP UART module to clear the wakeup signal before the LP core goes to sleep, otherwise, it will be repeated wakeup.
.. note::
On chips with ``SOC_LP_CORE_LP_UART_WAKEUP_KEEP_TRIGGERED``, the LP UART wakeup signal remains triggered after a wakeup event. The LP core startup flow (:cpp:func:`ulp_lp_core_update_wakeup_cause`) automatically calls :cpp:func:`ulp_lp_core_lp_uart_reset_wakeup_en` and :cpp:func:`lp_core_uart_clear_buf` to clear this state. If the standard startup flow is not used, you must handle this manually; otherwise, repeated wakeups will occur.
For example code on LP_UART wakeup, refer to :example:`system/ulp/lp_core/lp_uart/lp_uart_char_seq_wakeup`.