alex/esp-idf
1
0
Fork 0
mirror of https://github.com/espressif/esp-idf.git synced 2025-11-26 20:53:11 +00:00
Code Issues Packages Projects Releases Wiki Activity

feat(rmt): specify interrupt priority

Browse Source
This commit is contained in:
Planck (Lu Zeyu)
2023-08-29 17:56:03 +08:00
parent e0f5d3c527
commit 80fa5da9e8
10 changed files with 199 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
docs/en/api-reference/peripherals/rmt.rst
View File

@@ -92,6 +92,7 @@ To install an RMT TX channel, there is a configuration structure that needs to b
- :cpp:member:`rmt_tx_channel_config_t::with_dma` enables the DMA backend for the channel. Using the DMA allows a significant amount of the channel's workload to be offloaded from the CPU. However, the DMA backend is not available on all ESP chips, please refer to [`TRM <{IDF_TARGET_TRM_EN_URL}#rmt>`__] before you enable this option. Or you might encounter a :c:macro:`ESP_ERR_NOT_SUPPORTED` error.
- :cpp:member:`rmt_tx_channel_config_t::io_loop_back` enables both input and output capabilities on the channel's assigned GPIO. Thus, by binding a TX and RX channel to the same GPIO, loopback can be achieved.
- :cpp:member:`rmt_tx_channel_config_t::io_od_mode` configures the channel's assigned GPIO as open-drain. When combined with :cpp:member:`rmt_tx_channel_config_t::io_loop_back`, a bi-directional bus (e.g., 1-wire) can be achieved.
- :cpp:member:`rmt_tx_channel_config_t::intr_priority` Set the priority of the interrupt. If set to ``0`` , then the driver will use a interrupt with low or medium priority (priority level may be one of 1,2 or 3), otherwise use the priority indicated by :cpp:member:`rmt_tx_channel_config_t::intr_priority`. Please use the number form (1,2,3) , not the bitmask form ((1<<1),(1<<2),(1<<3)). Please pay attention that once the interrupt priority is set, it cannot be changed until :cpp:func:`rmt_del_channel` is called.
Once the :cpp:type:`rmt_tx_channel_config_t` structure is populated with mandatory parameters, users can call :cpp:func:`rmt_new_tx_channel` to allocate and initialize a TX channel. This function returns an RMT channel handle if it runs correctly. Specifically, when there are no more free channels in the RMT resource pool, this function returns :c:macro:`ESP_ERR_NOT_FOUND` error. If some feature (e.g., DMA backend) is not supported by the hardware, it returns :c:macro:`ESP_ERR_NOT_SUPPORTED` error.
@@ -125,6 +126,7 @@ To install an RMT RX channel, there is a configuration structure that needs to b
- :cpp:member:`rmt_rx_channel_config_t::invert_in` is used to invert the input signals before it is passed to the RMT receiver. The inversion is done by the GPIO matrix instead of by the RMT peripheral.
- :cpp:member:`rmt_rx_channel_config_t::with_dma` enables the DMA backend for the channel. Using the DMA allows a significant amount of the channel's workload to be offloaded from the CPU. However, the DMA backend is not available on all ESP chips, please refer to [`TRM <{IDF_TARGET_TRM_EN_URL}#rmt>`__] before you enable this option. Or you might encounter a :c:macro:`ESP_ERR_NOT_SUPPORTED` error.
- :cpp:member:`rmt_rx_channel_config_t::io_loop_back` enables both input and output capabilities on the channel's assigned GPIO. Thus, by binding a TX and RX channel to the same GPIO, loopback can be achieved.
- :cpp:member:`rmt_rx_channel_config_t::intr_priority` Set the priority of the interrupt. If set to ``0`` , then the driver will use a interrupt with low or medium priority (priority level may be one of 1,2 or 3), otherwise use the priority indicated by :cpp:member:`rmt_rx_channel_config_t::intr_priority`. Please use the number form (1,2,3) , not the bitmask form ((1<<1),(1<<2),(1<<3)). Please pay attention that once the interrupt priority is set, it cannot be changed until :cpp:func:`rmt_del_channel` is called.
Once the :cpp:type:`rmt_rx_channel_config_t` structure is populated with mandatory parameters, users can call :cpp:func:`rmt_new_rx_channel` to allocate and initialize an RX channel. This function returns an RMT channel handle if it runs correctly. Specifically, when there are no more free channels in the RMT resource pool, this function returns :c:macro:`ESP_ERR_NOT_FOUND` error. If some feature (e.g., DMA backend) is not supported by the hardware, it returns :c:macro:`ESP_ERR_NOT_SUPPORTED` error.