ESP Peripherals¶

This library simplifies the management of peripherals, by pooling and monitoring in a single task, adding basic functions to send and receive events. And it also provides APIs to easily integrate new peripherals.

Note

Note that if you do not intend to integrate new peripherals into esp_peripherals, you are only interested in simple api esp_periph_init, esp_periph_start, esp_periph_stop and esp_periph_destroy. If you want to integrate new peripherals, please refer to Periph Button source code

Examples¶

#include "esp_log.h"
#include "esp_peripherals.h"
#include "periph_sdcard.h"
#include "periph_button.h"
#include "periph_touch.h"

static const char *TAG = "ESP_PERIPH_TEST";

static esp_err_t _periph_event_handle(audio_event_iface_msg_t *event, void *context)
{
    switch ((int)event->source_type) {
        case PERIPH_ID_BUTTON:
            ESP_LOGI(TAG, "BUTTON[%d], event->event_id=%d", (int)event->data, event->cmd);
            break;
        case PERIPH_ID_SDCARD:
            ESP_LOGI(TAG, "SDCARD status, event->event_id=%d", event->cmd);
            break;
        case PERIPH_ID_TOUCH:
            ESP_LOGI(TAG, "TOUCH[%d], event->event_id=%d", (int)event->data, event->cmd);
            break;
        case PERIPH_ID_WIFI:
            ESP_LOGI(TAG, "WIFI, event->event_id=%d", event->cmd);
            break;
    }
    return ESP_OK;
}

void app_main(void)
{
    // Initialize Peripherals pool
    esp_periph_config_t periph_cfg = DEFAULT_ESP_PERIPH_SET_CONFIG();
    esp_periph_set_handle_t set = esp_periph_set_init(&periph_cfg);

    esp_periph_set_register_callback(set, _periph_event_handle, NULL);
    // Setup SDCARD peripheral
    periph_sdcard_cfg_t sdcard_cfg = {
        .root = "/sdcard",
        .card_detect_pin = GPIO_NUM_34,
    };
    esp_periph_handle_t sdcard_handle = periph_sdcard_init(&sdcard_cfg);

    // Setup BUTTON peripheral
    periph_button_cfg_t btn_cfg = {
        .gpio_mask = GPIO_SEL_36 | GPIO_SEL_39
    };
    esp_periph_handle_t button_handle = periph_button_init(&btn_cfg);

    // Setup TOUCH peripheral
    periph_touch_cfg_t touch_cfg = {
        .touch_mask = TOUCH_PAD_SEL4 | TOUCH_PAD_SEL7 | TOUCH_PAD_SEL8 | TOUCH_PAD_SEL9,
        .tap_threshold_percent = 70,
    };
    esp_periph_handle_t touch_handle = periph_touch_init(&touch_cfg);

    // Start all peripheral
    esp_periph_start(set, button_handle);
    esp_periph_start(set, sdcard_handle);
    esp_periph_start(set, touch_handle);
    vTaskDelay(10*1000/portTICK_RATE_MS);

    //Stop button peripheral
    esp_periph_stop(button_handle);
    vTaskDelay(10*1000/portTICK_RATE_MS);

    //Start button again
    esp_periph_start(set, button_handle);
    vTaskDelay(10*1000/portTICK_RATE_MS);

    //Stop & destroy all peripherals
    esp_periph_set_destroy(set);
}

API Reference¶

Header File¶

esp_peripherals/include/esp_peripherals.h

Functions¶

esp_periph_set_handle_t esp_periph_set_init(esp_periph_config_t *config)¶

Initialize esp_peripheral sets, create empty peripherals list. Call this function before starting any peripherals (with esp_periph_start). This call will initialize the data needed for esp_peripherals to work, but does not actually create the task. The event_handle is optional if you want to receive events from this callback function. The esp_peripherals task will send all events out to event_iface, can be listen by event_iface by esp_periph_get_event_iface. The user_context will sent esp_periph_event_handle_t as *context parameter.

Return

The peripheral sets instance

Parameters

config: The configurations

esp_err_t esp_periph_set_destroy(esp_periph_set_handle_t periph_set_handle)¶

This function will stop and kill the monitor task, calling all destroy callback functions of the peripheral (so you do not need to destroy the peripheral object manually). It will also remove all memory allocated to the peripherals list, so you need to call the esp_periph_set_init function again if you want to use it.

Return

ESP_OK
ESP_FAIL

Parameters

periph_set_handle: The esp_periph_set_handle_t instance

esp_err_t esp_periph_set_stop_all(esp_periph_set_handle_t periph_set_handle)¶

Stop monitoring all peripherals, the peripheral state is still kept. This funciton only temporary disables the peripheral.

Return

ESP_OK
ESP_FAIL

Parameters

periph_set_handle: The esp_periph_set_handle_t instance

esp_periph_handle_t esp_periph_set_get_by_id(esp_periph_set_handle_t periph_set_handle, int periph_id)¶

Get the peripheral handle by Peripheral ID.

Return

The esp_periph_handle_t

Parameters

periph_set_handle: The esp_periph_set_handle_t instance
periph_id: as esp_periph_id_t, or any ID you use when calling esp_periph_create

audio_event_iface_handle_t esp_periph_set_get_event_iface(esp_periph_set_handle_t periph_set_handle)¶

Return the event_iface used by this esp_peripherals.

Return

The audio event iface handle

Parameters

periph_set_handle: The esp_periph_set_handle_t instance

esp_err_t esp_periph_set_register_callback(esp_periph_set_handle_t periph_set_handle, esp_periph_event_handle_t cb, void *user_context)¶

Register peripheral sets event callback function.

Return

ESP_OK
ESP_FAIL

Parameters

periph_set_handle: The esp_periph_set_handle_t instance
cb: The event handle callback function
user_context: The user context pointer

QueueHandle_t esp_periph_set_get_queue(esp_periph_set_handle_t periph_set_handle)¶

Peripheral is using event_iface to control the event, all events are send out to event_iface queue. This function will be useful in case we want to read events directly from the event_iface queue.

Return

The queue handle

Parameters

periph_set_handle: The esp_periph_set_handle_t instance

esp_err_t esp_periph_set_list_init(esp_periph_set_handle_t periph_set_handle)¶

Call this function to initialize all the listed peripherals.

Note

Work with no task peripheral set only

Return

ESP_OK
ESP_FAIL

Parameters

periph_set_handle: The esp_periph_set_handle_t instance

esp_err_t esp_periph_set_list_run(esp_periph_set_handle_t periph_set_handle, audio_event_iface_msg_t msg)¶

Call this function to run all the listed peripherals.

Note

Work with no task peripheral set only

Return

ESP_OK
ESP_FAIL

Parameters

periph_set_handle: The esp_periph_set_handle_t instance
msg: The audio_event_iface_msg_t handle message

esp_err_t esp_periph_set_list_destroy(esp_periph_set_handle_t periph_set_handle)¶

Call this function to destroy all the listed peripherals.

Note

Work with no task peripheral set only

Return

ESP_OK
ESP_FAIL

Parameters

periph_set_handle: The esp_periph_set_handle_t instance

esp_periph_handle_t esp_periph_create(int periph_id, const char *tag)¶

Call this function to initialize a new peripheral.

Return

The peripheral handle

Parameters

periph_id: The periph identifier
tag: The tag name, we named it easy to get in debug logs

esp_err_t esp_periph_set_function(esp_periph_handle_t periph, esp_periph_func init, esp_periph_run_func run, esp_periph_func destroy)¶

Each peripheral has a cycle of sequential operations from initialization, execution of commands to destroying the peripheral. These operations are represented by functions passed as call parameters to this function.

Return

ESP_OK
ESP_FAIL

Parameters

periph: The periph
init: The initialize
run: The run
destroy: The destroy

esp_err_t esp_periph_start(esp_periph_set_handle_t periph_set_handle, esp_periph_handle_t periph)¶

Add the peripheral to peripherals list, enable and start monitor task (if task stack size > 0)

Note

This peripheral must be first created by calling esp_periph_create

Return

ESP_OK on success
ESP_FAIL when any errors

Parameters

periph_set_handle: The esp_periph_set_handle_t instance
periph: The peripheral instance

esp_err_t esp_periph_stop(esp_periph_handle_t periph)¶

Stop monitoring the peripheral, the peripheral state is still kept. This funciton only temporary disables the peripheral.

Return

ESP_OK
ESP_FAIL

Parameters

periph: The periph

esp_err_t esp_periph_send_cmd(esp_periph_handle_t periph, int cmd, void *data, int data_len)¶

When this function is called, the command is passed to the event_iface command queue, and the esp_periph_run_func of this peripheral will be executed in the main peripheral task. This function can be called from any task, basically it only sends a queue to the main peripheral task.

Return

ESP_OK
ESP_FAIL

Parameters

periph: The periph
cmd: The command
data: The data
data_len: The data length

esp_err_t esp_periph_send_cmd_from_isr(esp_periph_handle_t periph, int cmd, void *data, int data_len)¶

Similar to esp_periph_send_cmd, but it can be called in the hardware interrupt handle.

Return

ESP_OK
ESP_FAIL

Parameters

periph: The periph
cmd: The command
data: The data
data_len: The data length

esp_err_t esp_periph_send_event(esp_periph_handle_t periph, int event_id, void *data, int data_len)¶

In addition to sending an event via event_iface, this function will dispatch the event_handle callback if the event_handle callback is provided at esp_periph_init

Return

ESP_OK
ESP_FAIL

Parameters

periph: The peripheral
event_id: The event identifier
data: The data
data_len: The data length

esp_err_t esp_periph_start_timer(esp_periph_handle_t periph, TickType_t interval_tick, timer_callback callback)¶

Each peripheral can initialize a timer, which is by default NULL. When this function is called, the timer for the peripheral is created and it invokes the callback function every interval tick.

Note

You do not need to stop or destroy the timer, when the esp_periph_destroy function is called, it will stop and destroy all
This timer using FreeRTOS Timer, with autoreload = true

Return

ESP_OK
ESP_FAIL

Parameters

periph: The peripheral
interval_tick: The interval tick
callback: The callback

esp_err_t esp_periph_stop_timer(esp_periph_handle_t periph)¶

Stop peripheral timer.

Return

ESP_OK
ESP_FAIL

Parameters

periph: The peripheral

esp_err_t esp_periph_set_data(esp_periph_handle_t periph, void *data)¶

Set the user data.

Note

Make sure the data lifetime is sufficient, this function does not copy all data, it only stores the data pointer

Return

ESP_OK
ESP_FAIL

Parameters

periph: The peripheral
data: The data

void *esp_periph_get_data(esp_periph_handle_t periph)¶

Get the user data stored in the peripheral.

Return

Peripheral data pointer

Parameters

periph: The peripheral

esp_periph_state_t esp_periph_get_state(esp_periph_handle_t periph)¶

Get the current state of peripheral.

Return

The peripharal working state

Parameters

periph: The handle of peripheral

esp_periph_id_t esp_periph_get_id(esp_periph_handle_t periph)¶

Get Peripheral identifier.

Return

The peripheral identifier

Parameters

periph: The peripheral

esp_err_t esp_periph_set_id(esp_periph_handle_t periph, esp_periph_id_t periph_id)¶

Set Peripheral identifier.

Return

ESP_OK
ESP_FAIL

Parameters

periph: The peripheral
periph_id: The peripheral identifier

esp_err_t esp_periph_init(esp_periph_handle_t periph)¶

Call this to execute init function of peripheral instance.

Return

ESP_OK
ESP_FAIL

Parameters

periph: The peripheral handle

esp_err_t esp_periph_run(esp_periph_handle_t periph)¶

Call this to execute run function of peripheral instance.

Return

ESP_OK
ESP_FAIL

Parameters

periph: The peripheral handle

esp_err_t esp_periph_destroy(esp_periph_handle_t periph)¶

Call this to execute destroy function of peripheral instance.

Return

ESP_OK
ESP_FAIL

Parameters

periph: The peripheral handle

esp_err_t esp_periph_register_on_events(esp_periph_handle_t periph, esp_periph_event_t *evts)¶

Rigster peripheral on event handle.

Return

ESP_OK
ESP_FAIL

Parameters

periph: The peripheral handle
evts: The esp_periph_event_t handle

Structures¶

struct esp_periph_config_t¶

Common peripherals configurations.

Public Members

int task_stack¶: >0 Service task stack size; =0 without task created

int task_prio¶: Service task priority (based on freeRTOS priority)

int task_core¶: Service task running in core (0 or 1)

struct esp_periph_event¶

peripheral events

Public Members

void *user_ctx¶: peripheral context data

esp_periph_event_handle_t cb¶: peripheral callback function

audio_event_iface_handle_t iface¶: peripheral event

Macros¶

DEFAULT_ESP_PERIPH_STACK_SIZE¶

DEFAULT_ESP_PERIPH_TASK_PRIO¶

DEFAULT_ESP_PERIPH_TASK_CORE¶

DEFAULT_ESP_PERIPH_SET_CONFIG()¶

periph_tick_get¶

Type Definitions¶

typedef struct esp_periph_sets *esp_periph_set_handle_t¶

typedef struct esp_periph *esp_periph_handle_t¶

typedef esp_err_t (*esp_periph_func)(esp_periph_handle_t periph)¶

typedef esp_err_t (*esp_periph_run_func)(esp_periph_handle_t periph, audio_event_iface_msg_t *msg)¶

typedef esp_err_t (*esp_periph_event_handle_t)(audio_event_iface_msg_t *event, void *context)¶

typedef void (*timer_callback)(xTimerHandle tmr)¶

typedef struct esp_periph_event esp_periph_event_t¶: peripheral events

Enumerations¶

enum esp_periph_id_t¶

Peripheral Identify, this must be unique for each peripheral added to the peripherals list.

Values:

PERIPH_ID_BUTTON = AUDIO_ELEMENT_TYPE_PERIPH + 1¶

PERIPH_ID_TOUCH = AUDIO_ELEMENT_TYPE_PERIPH + 2¶

PERIPH_ID_SDCARD = AUDIO_ELEMENT_TYPE_PERIPH + 3¶

PERIPH_ID_WIFI = AUDIO_ELEMENT_TYPE_PERIPH + 4¶

PERIPH_ID_FLASH = AUDIO_ELEMENT_TYPE_PERIPH + 5¶

PERIPH_ID_AUXIN = AUDIO_ELEMENT_TYPE_PERIPH + 6¶

PERIPH_ID_ADC = AUDIO_ELEMENT_TYPE_PERIPH + 7¶

PERIPH_ID_CONSOLE = AUDIO_ELEMENT_TYPE_PERIPH + 8¶

PERIPH_ID_BLUETOOTH = AUDIO_ELEMENT_TYPE_PERIPH + 9¶

PERIPH_ID_LED = AUDIO_ELEMENT_TYPE_PERIPH + 10¶

PERIPH_ID_SPIFFS = AUDIO_ELEMENT_TYPE_PERIPH + 11¶

PERIPH_ID_ADC_BTN = AUDIO_ELEMENT_TYPE_PERIPH + 12¶

PERIPH_ID_IS31FL3216 = AUDIO_ELEMENT_TYPE_PERIPH + 13¶

PERIPH_ID_GPIO_ISR = AUDIO_ELEMENT_TYPE_PERIPH + 14¶

PERIPH_ID_WS2812 = AUDIO_ELEMENT_TYPE_PERIPH + 15¶

enum esp_periph_state_t¶

Peripheral working state.

Values:

PERIPH_STATE_NULL¶

PERIPH_STATE_INIT¶

PERIPH_STATE_RUNNING¶

PERIPH_STATE_PAUSE¶

PERIPH_STATE_STOPPING¶

PERIPH_STATE_ERROR¶

PERIPH_STATE_STATUS_MAX¶