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rmt: support REF_TICK as channel clock source

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Closes https://github.com/espressif/esp-idf/pull/3952
This commit is contained in:
morris
2020-02-14 14:33:07 +08:00
parent 3c43264f83
commit 0e4d82bc55
7 changed files with 82 additions and 42 deletions
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docs/en/api-reference/system/power_management.rst
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@@ -77,7 +77,7 @@ The following peripherals work normally even when the APB frequency is changing:
- **UART**: if REF_TICK is used as a clock source. See `use_ref_tick` member of :cpp:class:`uart_config_t`.
- **LEDC**: if REF_TICK is used as a clock source. See :cpp:func:`ledc_timer_config` function.
- **RMT**: if REF_TICK is used as a clock source. Although the driver does not support REF_TICK, this feature can be enabled by clearing the ``RMT_REF_ALWAYS_ON_CHx`` bit for the respective channel.
- **RMT**: if REF_TICK is used as a clock source. See `flags` member of :cpp:class:`rmt_config_t` and macro `RMT_CHANNEL_FLAGS_ALWAYS_ON`.
Currently, the following peripheral drivers are aware of DFS and will use the ``ESP_PM_APB_FREQ_MAX`` lock for the duration of the transaction: