389 lines
14 KiB
C
389 lines
14 KiB
C
/* ESPNOW Example
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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/*
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This example shows how to use ESPNOW.
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Prepare two device, one for sending ESPNOW data and another for receiving
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ESPNOW data.
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*/
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#include <stdlib.h>
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#include <time.h>
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#include <string.h>
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#include <assert.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/semphr.h"
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#include "freertos/timers.h"
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#include "nvs_flash.h"
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#include "esp_event_loop.h"
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#include "tcpip_adapter.h"
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#include "esp_wifi.h"
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#include "esp_log.h"
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#include "esp_system.h"
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#include "esp_now.h"
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#include "rom/ets_sys.h"
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#include "rom/crc.h"
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#include "espnow_example.h"
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static const char *TAG = "espnow_example";
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static xQueueHandle s_example_espnow_queue;
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static uint8_t s_example_broadcast_mac[ESP_NOW_ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
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static uint16_t s_example_espnow_seq[EXAMPLE_ESPNOW_DATA_MAX] = { 0, 0 };
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static void example_espnow_deinit(example_espnow_send_param_t *send_param);
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static esp_err_t example_event_handler(void *ctx, system_event_t *event)
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{
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switch(event->event_id) {
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case SYSTEM_EVENT_STA_START:
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ESP_LOGI(TAG, "WiFi started");
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break;
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default:
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break;
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}
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return ESP_OK;
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}
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/* WiFi should start before using ESPNOW */
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static void example_wifi_init(void)
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{
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tcpip_adapter_init();
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ESP_ERROR_CHECK( esp_event_loop_init(example_event_handler, NULL) );
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wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
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ESP_ERROR_CHECK( esp_wifi_init(&cfg) );
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ESP_ERROR_CHECK( esp_wifi_set_storage(WIFI_STORAGE_RAM) );
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ESP_ERROR_CHECK( esp_wifi_set_mode(ESPNOW_WIFI_MODE) );
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ESP_ERROR_CHECK( esp_wifi_start());
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/* In order to simplify example, channel is set after WiFi started.
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* This is not necessary in real application if the two devices have
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* been already on the same channel.
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*/
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ESP_ERROR_CHECK( esp_wifi_set_channel(CONFIG_ESPNOW_CHANNEL, 0) );
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#if CONFIG_ENABLE_LONG_RANGE
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ESP_ERROR_CHECK( esp_wifi_set_protocol(ESPNOW_WIFI_IF, WIFI_PROTOCOL_11B|WIFI_PROTOCOL_11G|WIFI_PROTOCOL_11N|WIFI_PROTOCOL_LR) );
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#endif
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}
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/* ESPNOW sending or receiving callback function is called in WiFi task.
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* Users should not do lengthy operations from this task. Instead, post
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* necessary data to a queue and handle it from a lower priority task. */
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static void example_espnow_send_cb(const uint8_t *mac_addr, esp_now_send_status_t status)
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{
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example_espnow_event_t evt;
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example_espnow_event_send_cb_t *send_cb = &evt.info.send_cb;
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if (mac_addr == NULL) {
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ESP_LOGE(TAG, "Send cb arg error");
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return;
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}
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evt.id = EXAMPLE_ESPNOW_SEND_CB;
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memcpy(send_cb->mac_addr, mac_addr, ESP_NOW_ETH_ALEN);
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send_cb->status = status;
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if (xQueueSend(s_example_espnow_queue, &evt, portMAX_DELAY) != pdTRUE) {
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ESP_LOGW(TAG, "Send send queue fail");
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}
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}
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static void example_espnow_recv_cb(const uint8_t *mac_addr, const uint8_t *data, int len)
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{
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example_espnow_event_t evt;
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example_espnow_event_recv_cb_t *recv_cb = &evt.info.recv_cb;
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if (mac_addr == NULL || data == NULL || len <= 0) {
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ESP_LOGE(TAG, "Receive cb arg error");
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return;
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}
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evt.id = EXAMPLE_ESPNOW_RECV_CB;
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memcpy(recv_cb->mac_addr, mac_addr, ESP_NOW_ETH_ALEN);
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recv_cb->data = malloc(len);
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if (recv_cb->data == NULL) {
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ESP_LOGE(TAG, "Malloc receive data fail");
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return;
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}
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memcpy(recv_cb->data, data, len);
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recv_cb->data_len = len;
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if (xQueueSend(s_example_espnow_queue, &evt, portMAX_DELAY) != pdTRUE) {
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ESP_LOGW(TAG, "Send receive queue fail");
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free(recv_cb->data);
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}
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}
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/* Parse received ESPNOW data. */
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int example_espnow_data_parse(uint8_t *data, uint16_t data_len, uint8_t *state, uint16_t *seq, int *magic)
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{
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example_espnow_data_t *buf = (example_espnow_data_t *)data;
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uint16_t crc, crc_cal = 0;
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if (data_len < sizeof(example_espnow_data_t)) {
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ESP_LOGE(TAG, "Receive ESPNOW data too short, len:%d", data_len);
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return -1;
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}
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*state = buf->state;
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*seq = buf->seq_num;
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*magic = buf->magic;
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crc = buf->crc;
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buf->crc = 0;
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crc_cal = crc16_le(UINT16_MAX, (uint8_t const *)buf, data_len);
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if (crc_cal == crc) {
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return buf->type;
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}
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return -1;
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}
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/* Prepare ESPNOW data to be sent. */
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void example_espnow_data_prepare(example_espnow_send_param_t *send_param)
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{
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example_espnow_data_t *buf = (example_espnow_data_t *)send_param->buffer;
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assert(send_param->len >= sizeof(example_espnow_data_t));
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buf->type = IS_BROADCAST_ADDR(send_param->dest_mac) ? EXAMPLE_ESPNOW_DATA_BROADCAST : EXAMPLE_ESPNOW_DATA_UNICAST;
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buf->state = send_param->state;
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buf->seq_num = s_example_espnow_seq[buf->type]++;
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buf->crc = 0;
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buf->magic = send_param->magic;
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/* Fill all remaining bytes after the data with random values */
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esp_fill_random(buf->payload, send_param->len - sizeof(example_espnow_data_t));
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buf->crc = crc16_le(UINT16_MAX, (uint8_t const *)buf, send_param->len);
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}
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static void example_espnow_task(void *pvParameter)
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{
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example_espnow_event_t evt;
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uint8_t recv_state = 0;
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uint16_t recv_seq = 0;
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int recv_magic = 0;
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bool is_broadcast = false;
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int ret;
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vTaskDelay(5000 / portTICK_RATE_MS);
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ESP_LOGI(TAG, "Start sending broadcast data");
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/* Start sending broadcast ESPNOW data. */
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example_espnow_send_param_t *send_param = (example_espnow_send_param_t *)pvParameter;
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if (esp_now_send(send_param->dest_mac, send_param->buffer, send_param->len) != ESP_OK) {
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ESP_LOGE(TAG, "Send error");
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example_espnow_deinit(send_param);
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vTaskDelete(NULL);
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}
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while (xQueueReceive(s_example_espnow_queue, &evt, portMAX_DELAY) == pdTRUE) {
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switch (evt.id) {
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case EXAMPLE_ESPNOW_SEND_CB:
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{
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example_espnow_event_send_cb_t *send_cb = &evt.info.send_cb;
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is_broadcast = IS_BROADCAST_ADDR(send_cb->mac_addr);
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ESP_LOGD(TAG, "Send data to "MACSTR", status1: %d", MAC2STR(send_cb->mac_addr), send_cb->status);
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if (is_broadcast && (send_param->broadcast == false)) {
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break;
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}
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if (!is_broadcast) {
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send_param->count--;
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if (send_param->count == 0) {
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ESP_LOGI(TAG, "Send done");
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example_espnow_deinit(send_param);
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vTaskDelete(NULL);
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}
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}
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/* Delay a while before sending the next data. */
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if (send_param->delay > 0) {
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vTaskDelay(send_param->delay/portTICK_RATE_MS);
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}
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ESP_LOGI(TAG, "send data to "MACSTR"", MAC2STR(send_cb->mac_addr));
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memcpy(send_param->dest_mac, send_cb->mac_addr, ESP_NOW_ETH_ALEN);
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example_espnow_data_prepare(send_param);
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/* Send the next data after the previous data is sent. */
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if (esp_now_send(send_param->dest_mac, send_param->buffer, send_param->len) != ESP_OK) {
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ESP_LOGE(TAG, "Send error");
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example_espnow_deinit(send_param);
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vTaskDelete(NULL);
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}
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break;
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}
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case EXAMPLE_ESPNOW_RECV_CB:
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{
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example_espnow_event_recv_cb_t *recv_cb = &evt.info.recv_cb;
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ret = example_espnow_data_parse(recv_cb->data, recv_cb->data_len, &recv_state, &recv_seq, &recv_magic);
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free(recv_cb->data);
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if (ret == EXAMPLE_ESPNOW_DATA_BROADCAST) {
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ESP_LOGI(TAG, "Receive %dth broadcast data from: "MACSTR", len: %d", recv_seq, MAC2STR(recv_cb->mac_addr), recv_cb->data_len);
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/* If MAC address does not exist in peer list, add it to peer list. */
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if (esp_now_is_peer_exist(recv_cb->mac_addr) == false) {
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esp_now_peer_info_t *peer = malloc(sizeof(esp_now_peer_info_t));
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if (peer == NULL) {
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ESP_LOGE(TAG, "Malloc peer information fail");
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example_espnow_deinit(send_param);
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vTaskDelete(NULL);
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}
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memset(peer, 0, sizeof(esp_now_peer_info_t));
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peer->channel = CONFIG_ESPNOW_CHANNEL;
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peer->ifidx = ESPNOW_WIFI_IF;
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peer->encrypt = true;
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memcpy(peer->lmk, CONFIG_ESPNOW_LMK, ESP_NOW_KEY_LEN);
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memcpy(peer->peer_addr, recv_cb->mac_addr, ESP_NOW_ETH_ALEN);
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ESP_ERROR_CHECK( esp_now_add_peer(peer) );
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free(peer);
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}
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/* Indicates that the device has received broadcast ESPNOW data. */
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if (send_param->state == 0) {
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send_param->state = 1;
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}
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/* If receive broadcast ESPNOW data which indicates that the other device has received
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* broadcast ESPNOW data and the local magic number is bigger than that in the received
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* broadcast ESPNOW data, stop sending broadcast ESPNOW data and start sending unicast
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* ESPNOW data.
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*/
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if (recv_state == 1) {
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/* The device which has the bigger magic number sends ESPNOW data, the other one
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* receives ESPNOW data.
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*/
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if (send_param->unicast == false && send_param->magic >= recv_magic) {
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ESP_LOGI(TAG, "Start sending unicast data");
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ESP_LOGI(TAG, "send data to "MACSTR"", MAC2STR(recv_cb->mac_addr));
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/* Start sending unicast ESPNOW data. */
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memcpy(send_param->dest_mac, recv_cb->mac_addr, ESP_NOW_ETH_ALEN);
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example_espnow_data_prepare(send_param);
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if (esp_now_send(send_param->dest_mac, send_param->buffer, send_param->len) != ESP_OK) {
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ESP_LOGE(TAG, "Send error");
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example_espnow_deinit(send_param);
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vTaskDelete(NULL);
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}
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else {
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send_param->broadcast = false;
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send_param->unicast = true;
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}
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}
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}
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}
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else if (ret == EXAMPLE_ESPNOW_DATA_UNICAST) {
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ESP_LOGI(TAG, "Receive %dth unicast data from: "MACSTR", len: %d", recv_seq, MAC2STR(recv_cb->mac_addr), recv_cb->data_len);
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/* If receive unicast ESPNOW data, also stop sending broadcast ESPNOW data. */
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send_param->broadcast = false;
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}
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else {
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ESP_LOGI(TAG, "Receive error data from: "MACSTR"", MAC2STR(recv_cb->mac_addr));
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}
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break;
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}
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default:
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ESP_LOGE(TAG, "Callback type error: %d", evt.id);
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break;
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}
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}
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}
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static esp_err_t example_espnow_init(void)
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{
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example_espnow_send_param_t *send_param;
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s_example_espnow_queue = xQueueCreate(ESPNOW_QUEUE_SIZE, sizeof(example_espnow_event_t));
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if (s_example_espnow_queue == NULL) {
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ESP_LOGE(TAG, "Create mutex fail");
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return ESP_FAIL;
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}
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/* Initialize ESPNOW and register sending and receiving callback function. */
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ESP_ERROR_CHECK( esp_now_init() );
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ESP_ERROR_CHECK( esp_now_register_send_cb(example_espnow_send_cb) );
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ESP_ERROR_CHECK( esp_now_register_recv_cb(example_espnow_recv_cb) );
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/* Set primary master key. */
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ESP_ERROR_CHECK( esp_now_set_pmk((uint8_t *)CONFIG_ESPNOW_PMK) );
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/* Add broadcast peer information to peer list. */
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esp_now_peer_info_t *peer = malloc(sizeof(esp_now_peer_info_t));
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if (peer == NULL) {
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ESP_LOGE(TAG, "Malloc peer information fail");
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vSemaphoreDelete(s_example_espnow_queue);
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esp_now_deinit();
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return ESP_FAIL;
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}
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memset(peer, 0, sizeof(esp_now_peer_info_t));
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peer->channel = CONFIG_ESPNOW_CHANNEL;
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peer->ifidx = ESPNOW_WIFI_IF;
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peer->encrypt = false;
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memcpy(peer->peer_addr, s_example_broadcast_mac, ESP_NOW_ETH_ALEN);
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ESP_ERROR_CHECK( esp_now_add_peer(peer) );
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free(peer);
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/* Initialize sending parameters. */
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send_param = malloc(sizeof(example_espnow_send_param_t));
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memset(send_param, 0, sizeof(example_espnow_send_param_t));
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if (send_param == NULL) {
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ESP_LOGE(TAG, "Malloc send parameter fail");
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vSemaphoreDelete(s_example_espnow_queue);
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esp_now_deinit();
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return ESP_FAIL;
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}
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send_param->unicast = false;
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send_param->broadcast = true;
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send_param->state = 0;
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send_param->magic = esp_random();
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send_param->count = CONFIG_ESPNOW_SEND_COUNT;
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send_param->delay = CONFIG_ESPNOW_SEND_DELAY;
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send_param->len = CONFIG_ESPNOW_SEND_LEN;
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send_param->buffer = malloc(CONFIG_ESPNOW_SEND_LEN);
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if (send_param->buffer == NULL) {
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ESP_LOGE(TAG, "Malloc send buffer fail");
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free(send_param);
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vSemaphoreDelete(s_example_espnow_queue);
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esp_now_deinit();
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return ESP_FAIL;
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}
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memcpy(send_param->dest_mac, s_example_broadcast_mac, ESP_NOW_ETH_ALEN);
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example_espnow_data_prepare(send_param);
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xTaskCreate(example_espnow_task, "example_espnow_task", 2048, send_param, 4, NULL);
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return ESP_OK;
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}
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static void example_espnow_deinit(example_espnow_send_param_t *send_param)
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{
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free(send_param->buffer);
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free(send_param);
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vSemaphoreDelete(s_example_espnow_queue);
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esp_now_deinit();
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}
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void app_main()
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{
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// Initialize NVS
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esp_err_t ret = nvs_flash_init();
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if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
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ESP_ERROR_CHECK( nvs_flash_erase() );
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ret = nvs_flash_init();
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}
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ESP_ERROR_CHECK( ret );
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example_wifi_init();
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example_espnow_init();
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}
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