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docs(i2s): update programming guide for I2S ETM feature

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laokaiyao
2024-08-02 16:21:41 +08:00
parent a51b5dbe78
commit 1c52462a4d
5 changed files with 152 additions and 2 deletions
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2
docs/en/api-reference/peripherals/etm.rst
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@@ -72,6 +72,7 @@ Other Peripheral Events
:SOC_MCPWM_SUPPORT_ETM: - Refer to :doc:`/api-reference/peripherals/mcpwm` for how to get the ETM event handle from MCPWM.
:SOC_ANA_CMPR_SUPPORT_ETM: - Refer to :doc:`/api-reference/peripherals/ana_cmpr` for how to get the ETM event handle from analog comparator.
:SOC_TEMPERATURE_SENSOR_SUPPORT_ETM: - Refer to :doc:`/api-reference/peripherals/temp_sensor` for how to get the ETM event handle from temperature sensor.
:SOC_I2S_SUPPORTS_ETM: - Refer to :doc:`/api-reference/peripherals/i2s` for how to get the ETM event handle from I2S.
.. _etm-task:
@@ -98,6 +99,7 @@ Other Peripheral Tasks
:SOC_TIMER_SUPPORT_ETM: - Refer to :doc:`GPTimer </api-reference/peripherals/gptimer>` for how to get the ETM task handle from GPTimer.
:SOC_TEMPERATURE_SENSOR_SUPPORT_ETM: - Refer to :doc:`/api-reference/peripherals/temp_sensor` for how to get the ETM task handle from temperature sensor.
:SOC_I2S_SUPPORTS_ETM: - Refer to :doc:`/api-reference/peripherals/i2s` for how to get the ETM task handle from I2S.
.. _etm-channel-control:

73
docs/en/api-reference/peripherals/i2s.rst
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@@ -979,6 +979,79 @@ Here is an example of how to allocate a pair of full-duplex channels:
i2s_channel_init_std_mode(rx_handle, &std_rx_cfg);
i2s_channel_enable(rx_handle);
.. only:: SOC_I2S_SUPPORTS_ETM
I2S ETM Usage
^^^^^^^^^^^^^
{IDF_TARGET_NAME} supports I2S ETM (Event Task Matrix), which allows to trigger other ETM tasks via I2S ETM events, or to control the start/stop by I2S ETM tasks.
The I2S ETM APIs can be found in ``driver/i2s_etm.h``, the following example shows how to use GPIO to start/stop I2S channel via ETM:
.. code-block:: c
#include "driver/i2s_etm.h"
// ...
i2s_chan_handle_t tx_handle;
// Initialize I2S channel
// ......
int ctrl_gpio = 4;
// Initialize GPIO
// ......
/* Register GPIO ETM events */
gpio_etm_event_config_t gpio_event_cfg = {
.edges = {GPIO_ETM_EVENT_EDGE_POS, GPIO_ETM_EVENT_EDGE_NEG},
};
esp_etm_event_handle_t gpio_pos_event_handle;
esp_etm_event_handle_t gpio_neg_event_handle;
gpio_new_etm_event(&gpio_event_cfg, &gpio_pos_event_handle, &gpio_neg_event_handle);
gpio_etm_event_bind_gpio(gpio_pos_event_handle, ctrl_gpio);
gpio_etm_event_bind_gpio(gpio_neg_event_handle, ctrl_gpio);
/* Register I2S ETM tasks */
i2s_etm_task_config_t i2s_start_task_cfg = {
.task_type = I2S_ETM_TASK_START,
};
esp_etm_task_handle_t i2s_start_task_handle;
i2s_new_etm_task(tx_handle, &i2s_start_task_cfg, &i2s_start_task_handle);
i2s_etm_task_config_t i2s_stop_task_cfg = {
.task_type = I2S_ETM_TASK_STOP,
};
esp_etm_task_handle_t i2s_stop_task_handle;
i2s_new_etm_task(tx_handle, &i2s_stop_task_cfg, &i2s_stop_task_handle);
/* Bind GPIO events to I2S ETM tasks */
esp_etm_channel_config_t etm_config = {};
esp_etm_channel_handle_t i2s_etm_start_chan = NULL;
esp_etm_channel_handle_t i2s_etm_stop_chan = NULL;
esp_etm_new_channel(&etm_config, &i2s_etm_start_chan);
esp_etm_new_channel(&etm_config, &i2s_etm_stop_chan);
esp_etm_channel_connect(i2s_etm_start_chan, gpio_pos_event_handle, i2s_start_task_handle);
esp_etm_channel_connect(i2s_etm_stop_chan, gpio_neg_event_handle, i2s_stop_task_handle);
esp_etm_channel_enable(i2s_etm_start_chan);
esp_etm_channel_enable(i2s_etm_stop_chan);
/* Enable I2S channel first before starting I2S channel */
i2s_channel_enable(tx_handle);
// (Optional) Able to load the data into the internal DMA buffer here,
// but tx_channel does not start yet, will timeout when the internal buffer is full
// i2s_channel_write(tx_handle, data, data_size, NULL, 0);
/* Start I2S channel by setting the GPIO to high */
gpio_set_level(ctrl_gpio, 1);
// Write data ......
// i2s_channel_write(tx_handle, data, data_size, NULL, 1000);
/* Stop I2S channel by setting the GPIO to low */
gpio_set_level(ctrl_gpio, 0);
/* Free resources */
i2s_channel_disable(tx_handle);
esp_etm_channel_disable(i2s_etm_start_chan);
esp_etm_channel_disable(i2s_etm_stop_chan);
esp_etm_del_event(gpio_pos_event_handle);
esp_etm_del_event(gpio_neg_event_handle);
esp_etm_del_task(i2s_start_task_handle);
esp_etm_del_task(i2s_stop_task_handle);
esp_etm_del_channel(i2s_etm_start_chan);
esp_etm_del_channel(i2s_etm_stop_chan);
// De-initialize I2S and GPIO
// ......
Application Notes
-----------------