572 lines
18 KiB
C
572 lines
18 KiB
C
/*
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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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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/timers.h"
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#include "nvs.h"
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#include "nvs_flash.h"
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#include "esp_system.h"
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#include "esp_log.h"
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#include "esp_bt.h"
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#include "bt_app_core.h"
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#include "esp_bt_main.h"
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#include "esp_bt_device.h"
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#include "esp_gap_bt_api.h"
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#include "esp_a2dp_api.h"
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#include "esp_avrc_api.h"
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#define BT_AV_TAG "BT_AV"
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/* event for handler "bt_av_hdl_stack_up */
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enum {
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BT_APP_EVT_STACK_UP = 0,
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};
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/* A2DP global state */
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enum {
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APP_AV_STATE_IDLE,
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APP_AV_STATE_DISCOVERING,
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APP_AV_STATE_DISCOVERED,
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APP_AV_STATE_UNCONNECTED,
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APP_AV_STATE_CONNECTING,
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APP_AV_STATE_CONNECTED,
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APP_AV_STATE_DISCONNECTING,
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};
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/* sub states of APP_AV_STATE_CONNECTED */
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enum {
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APP_AV_MEDIA_STATE_IDLE,
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APP_AV_MEDIA_STATE_STARTING,
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APP_AV_MEDIA_STATE_STARTED,
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APP_AV_MEDIA_STATE_STOPPING,
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};
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#define BT_APP_HEART_BEAT_EVT (0xff00)
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/// handler for bluetooth stack enabled events
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static void bt_av_hdl_stack_evt(uint16_t event, void *p_param);
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/// callback function for A2DP source
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static void bt_app_a2d_cb(esp_a2d_cb_event_t event, esp_a2d_cb_param_t *param);
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/// callback function for A2DP source audio data stream
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static int32_t bt_app_a2d_data_cb(uint8_t *data, int32_t len);
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static void a2d_app_heart_beat(void *arg);
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/// A2DP application state machine
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static void bt_app_av_sm_hdlr(uint16_t event, void *param);
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/* A2DP application state machine handler for each state */
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static void bt_app_av_state_unconnected(uint16_t event, void *param);
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static void bt_app_av_state_connecting(uint16_t event, void *param);
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static void bt_app_av_state_connected(uint16_t event, void *param);
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static void bt_app_av_state_disconnecting(uint16_t event, void *param);
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static esp_bd_addr_t s_peer_bda = {0};
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static uint8_t s_peer_bdname[ESP_BT_GAP_MAX_BDNAME_LEN + 1];
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static int s_a2d_state = APP_AV_STATE_IDLE;
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static int s_media_state = APP_AV_MEDIA_STATE_IDLE;
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static int s_intv_cnt = 0;
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static int s_connecting_intv = 0;
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static uint32_t s_pkt_cnt = 0;
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static TimerHandle_t s_tmr;
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static char *bda2str(esp_bd_addr_t bda, char *str, size_t size)
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{
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if (bda == NULL || str == NULL || size < 18) {
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return NULL;
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}
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uint8_t *p = bda;
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sprintf(str, "%02x:%02x:%02x:%02x:%02x:%02x",
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p[0], p[1], p[2], p[3], p[4], p[5]);
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return str;
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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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esp_bt_controller_config_t bt_cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
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if (esp_bt_controller_init(&bt_cfg) != ESP_OK) {
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ESP_LOGE(BT_AV_TAG, "%s initialize controller failed\n", __func__);
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return;
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}
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if (esp_bt_controller_enable(ESP_BT_MODE_BTDM) != ESP_OK) {
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ESP_LOGE(BT_AV_TAG, "%s enable controller failed\n", __func__);
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return;
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}
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if (esp_bluedroid_init() != ESP_OK) {
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ESP_LOGE(BT_AV_TAG, "%s initialize bluedroid failed\n", __func__);
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return;
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}
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if (esp_bluedroid_enable() != ESP_OK) {
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ESP_LOGE(BT_AV_TAG, "%s enable bluedroid failed\n", __func__);
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return;
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}
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/* create application task */
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bt_app_task_start_up();
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/* Bluetooth device name, connection mode and profile set up */
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bt_app_work_dispatch(bt_av_hdl_stack_evt, BT_APP_EVT_STACK_UP, NULL, 0, NULL);
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/* Set default parameters for Secure Simple Pairing */
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esp_bt_sp_param_t param_type = ESP_BT_SP_IOCAP_MODE;
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esp_bt_io_cap_t iocap = ESP_BT_IO_CAP_IO;
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esp_bt_gap_set_security_param(param_type, &iocap, sizeof(uint8_t));
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/*
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* Set default parameters for Legacy Pairing
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* Use variable pin, input pin code when pairing
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*/
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esp_bt_pin_type_t pin_type = ESP_BT_PIN_TYPE_VARIABLE;
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esp_bt_pin_code_t pin_code;
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esp_bt_gap_set_pin(pin_type, 0, pin_code);
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}
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static bool get_name_from_eir(uint8_t *eir, uint8_t *bdname, uint8_t *bdname_len)
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{
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uint8_t *rmt_bdname = NULL;
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uint8_t rmt_bdname_len = 0;
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if (!eir) {
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return false;
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}
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rmt_bdname = esp_bt_gap_resolve_eir_data(eir, ESP_BT_EIR_TYPE_CMPL_LOCAL_NAME, &rmt_bdname_len);
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if (!rmt_bdname) {
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rmt_bdname = esp_bt_gap_resolve_eir_data(eir, ESP_BT_EIR_TYPE_SHORT_LOCAL_NAME, &rmt_bdname_len);
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}
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if (rmt_bdname) {
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if (rmt_bdname_len > ESP_BT_GAP_MAX_BDNAME_LEN) {
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rmt_bdname_len = ESP_BT_GAP_MAX_BDNAME_LEN;
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}
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if (bdname) {
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memcpy(bdname, rmt_bdname, rmt_bdname_len);
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bdname[rmt_bdname_len] = '\0';
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}
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if (bdname_len) {
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*bdname_len = rmt_bdname_len;
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}
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return true;
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}
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return false;
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}
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static void filter_inquiry_scan_result(esp_bt_gap_cb_param_t *param)
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{
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char bda_str[18];
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uint32_t cod = 0;
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int32_t rssi = -129; /* invalid value */
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uint8_t *eir = NULL;
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esp_bt_gap_dev_prop_t *p;
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ESP_LOGI(BT_AV_TAG, "Scanned device: %s", bda2str(param->disc_res.bda, bda_str, 18));
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for (int i = 0; i < param->disc_res.num_prop; i++) {
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p = param->disc_res.prop + i;
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switch (p->type) {
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case ESP_BT_GAP_DEV_PROP_COD:
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cod = *(uint32_t *)(p->val);
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ESP_LOGI(BT_AV_TAG, "--Class of Device: 0x%x", cod);
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break;
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case ESP_BT_GAP_DEV_PROP_RSSI:
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rssi = *(int8_t *)(p->val);
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ESP_LOGI(BT_AV_TAG, "--RSSI: %d", rssi);
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break;
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case ESP_BT_GAP_DEV_PROP_EIR:
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eir = (uint8_t *)(p->val);
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break;
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case ESP_BT_GAP_DEV_PROP_BDNAME:
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default:
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break;
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}
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}
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/* search for device with MAJOR service class as "rendering" in COD */
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if (!esp_bt_gap_is_valid_cod(cod) ||
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!(esp_bt_gap_get_cod_srvc(cod) & ESP_BT_COD_SRVC_RENDERING)) {
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return;
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}
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/* search for device named "ESP_SPEAKER" in its extended inqury response */
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if (eir) {
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get_name_from_eir(eir, s_peer_bdname, NULL);
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if (strcmp((char *)s_peer_bdname, "ESP_SPEAKER") != 0) {
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return;
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}
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ESP_LOGI(BT_AV_TAG, "Found a target device, address %s, name %s", bda_str, s_peer_bdname);
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s_a2d_state = APP_AV_STATE_DISCOVERED;
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memcpy(s_peer_bda, param->disc_res.bda, ESP_BD_ADDR_LEN);
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ESP_LOGI(BT_AV_TAG, "Cancel device discovery ...");
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esp_bt_gap_cancel_discovery();
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}
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}
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void bt_app_gap_cb(esp_bt_gap_cb_event_t event, esp_bt_gap_cb_param_t *param)
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{
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switch (event) {
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case ESP_BT_GAP_DISC_RES_EVT: {
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filter_inquiry_scan_result(param);
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break;
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}
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case ESP_BT_GAP_DISC_STATE_CHANGED_EVT: {
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if (param->disc_st_chg.state == ESP_BT_GAP_DISCOVERY_STOPPED) {
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if (s_a2d_state == APP_AV_STATE_DISCOVERED) {
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s_a2d_state = APP_AV_STATE_CONNECTING;
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ESP_LOGI(BT_AV_TAG, "Device discovery stopped.");
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ESP_LOGI(BT_AV_TAG, "a2dp connecting to peer: %s", s_peer_bdname);
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esp_a2d_source_connect(s_peer_bda);
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} else {
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// not discovered, continue to discover
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ESP_LOGI(BT_AV_TAG, "Device discovery failed, continue to discover...");
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esp_bt_gap_start_discovery(ESP_BT_INQ_MODE_GENERAL_INQUIRY, 10, 0);
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}
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} else if (param->disc_st_chg.state == ESP_BT_GAP_DISCOVERY_STARTED) {
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ESP_LOGI(BT_AV_TAG, "Discovery started.");
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}
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break;
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}
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case ESP_BT_GAP_RMT_SRVCS_EVT:
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case ESP_BT_GAP_RMT_SRVC_REC_EVT:
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break;
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case ESP_BT_GAP_AUTH_CMPL_EVT: {
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if (param->auth_cmpl.stat == ESP_BT_STATUS_SUCCESS) {
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ESP_LOGI(BT_AV_TAG, "authentication success: %s", param->auth_cmpl.device_name);
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esp_log_buffer_hex(BT_AV_TAG, param->auth_cmpl.bda, ESP_BD_ADDR_LEN);
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} else {
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ESP_LOGE(BT_AV_TAG, "authentication failed, status:%d", param->auth_cmpl.stat);
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}
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break;
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}
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case ESP_BT_GAP_PIN_REQ_EVT: {
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ESP_LOGI(BT_AV_TAG, "ESP_BT_GAP_PIN_REQ_EVT min_16_digit:%d", param->pin_req.min_16_digit);
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if (param->pin_req.min_16_digit) {
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ESP_LOGI(BT_AV_TAG, "Input pin code: 0000 0000 0000 0000");
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esp_bt_pin_code_t pin_code = {0};
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esp_bt_gap_pin_reply(param->pin_req.bda, true, 16, pin_code);
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} else {
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ESP_LOGI(BT_AV_TAG, "Input pin code: 1234");
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esp_bt_pin_code_t pin_code;
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pin_code[0] = '1';
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pin_code[1] = '2';
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pin_code[2] = '3';
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pin_code[3] = '4';
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esp_bt_gap_pin_reply(param->pin_req.bda, true, 4, pin_code);
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}
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break;
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}
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case ESP_BT_GAP_CFM_REQ_EVT:
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ESP_LOGI(BT_AV_TAG, "ESP_BT_GAP_CFM_REQ_EVT Please compare the numeric value: %d", param->cfm_req.num_val);
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esp_bt_gap_ssp_confirm_reply(param->cfm_req.bda, true);
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break;
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case ESP_BT_GAP_KEY_NOTIF_EVT:
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ESP_LOGI(BT_AV_TAG, "ESP_BT_GAP_KEY_NOTIF_EVT passkey:%d", param->key_notif.passkey);
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break;
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case ESP_BT_GAP_KEY_REQ_EVT:
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ESP_LOGI(BT_AV_TAG, "ESP_BT_GAP_KEY_REQ_EVT Please enter passkey!");
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break;
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default: {
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ESP_LOGI(BT_AV_TAG, "event: %d", event);
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break;
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}
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}
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return;
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}
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static void bt_av_hdl_stack_evt(uint16_t event, void *p_param)
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{
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ESP_LOGD(BT_AV_TAG, "%s evt %d", __func__, event);
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switch (event) {
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case BT_APP_EVT_STACK_UP: {
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/* set up device name */
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char *dev_name = "ESP_A2DP_SRC";
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esp_bt_dev_set_device_name(dev_name);
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/* register GAP callback function */
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esp_bt_gap_register_callback(bt_app_gap_cb);
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/* initialize A2DP source */
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esp_a2d_register_callback(&bt_app_a2d_cb);
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esp_a2d_source_register_data_callback(bt_app_a2d_data_cb);
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esp_a2d_source_init();
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/* set discoverable and connectable mode */
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esp_bt_gap_set_scan_mode(ESP_BT_SCAN_MODE_CONNECTABLE_DISCOVERABLE);
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/* start device discovery */
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ESP_LOGI(BT_AV_TAG, "Starting device discovery...");
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s_a2d_state = APP_AV_STATE_DISCOVERING;
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esp_bt_gap_start_discovery(ESP_BT_INQ_MODE_GENERAL_INQUIRY, 10, 0);
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/* create and start heart beat timer */
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do {
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int tmr_id = 0;
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s_tmr = xTimerCreate("connTmr", (10000 / portTICK_RATE_MS),
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pdTRUE, (void *)tmr_id, a2d_app_heart_beat);
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xTimerStart(s_tmr, portMAX_DELAY);
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} while (0);
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break;
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}
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default:
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ESP_LOGE(BT_AV_TAG, "%s unhandled evt %d", __func__, event);
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break;
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}
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}
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static void bt_app_a2d_cb(esp_a2d_cb_event_t event, esp_a2d_cb_param_t *param)
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{
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bt_app_work_dispatch(bt_app_av_sm_hdlr, event, param, sizeof(esp_a2d_cb_param_t), NULL);
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}
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static int32_t bt_app_a2d_data_cb(uint8_t *data, int32_t len)
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{
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if (len < 0 || data == NULL) {
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return 0;
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}
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// generate random sequence
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int val = rand() % (1 << 16);
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for (int i = 0; i < (len >> 1); i++) {
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data[(i << 1)] = val & 0xff;
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data[(i << 1) + 1] = (val >> 8) & 0xff;
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}
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return len;
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}
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static void a2d_app_heart_beat(void *arg)
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{
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bt_app_work_dispatch(bt_app_av_sm_hdlr, BT_APP_HEART_BEAT_EVT, NULL, 0, NULL);
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}
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static void bt_app_av_sm_hdlr(uint16_t event, void *param)
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{
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ESP_LOGI(BT_AV_TAG, "%s state %d, evt 0x%x", __func__, s_a2d_state, event);
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switch (s_a2d_state) {
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case APP_AV_STATE_DISCOVERING:
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case APP_AV_STATE_DISCOVERED:
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break;
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case APP_AV_STATE_UNCONNECTED:
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bt_app_av_state_unconnected(event, param);
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break;
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case APP_AV_STATE_CONNECTING:
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bt_app_av_state_connecting(event, param);
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break;
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case APP_AV_STATE_CONNECTED:
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bt_app_av_state_connected(event, param);
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break;
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case APP_AV_STATE_DISCONNECTING:
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bt_app_av_state_disconnecting(event, param);
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break;
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default:
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ESP_LOGE(BT_AV_TAG, "%s invalid state %d", __func__, s_a2d_state);
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break;
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}
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}
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static void bt_app_av_state_unconnected(uint16_t event, void *param)
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{
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switch (event) {
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case ESP_A2D_CONNECTION_STATE_EVT:
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case ESP_A2D_AUDIO_STATE_EVT:
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case ESP_A2D_AUDIO_CFG_EVT:
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case ESP_A2D_MEDIA_CTRL_ACK_EVT:
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break;
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case BT_APP_HEART_BEAT_EVT: {
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uint8_t *p = s_peer_bda;
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ESP_LOGI(BT_AV_TAG, "a2dp connecting to peer: %02x:%02x:%02x:%02x:%02x:%02x",
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p[0], p[1], p[2], p[3], p[4], p[5]);
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esp_a2d_source_connect(s_peer_bda);
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s_a2d_state = APP_AV_STATE_CONNECTING;
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s_connecting_intv = 0;
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break;
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}
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default:
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ESP_LOGE(BT_AV_TAG, "%s unhandled evt %d", __func__, event);
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break;
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}
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}
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static void bt_app_av_state_connecting(uint16_t event, void *param)
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{
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esp_a2d_cb_param_t *a2d = NULL;
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switch (event) {
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case ESP_A2D_CONNECTION_STATE_EVT: {
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a2d = (esp_a2d_cb_param_t *)(param);
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if (a2d->conn_stat.state == ESP_A2D_CONNECTION_STATE_CONNECTED) {
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ESP_LOGI(BT_AV_TAG, "a2dp connected");
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s_a2d_state = APP_AV_STATE_CONNECTED;
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s_media_state = APP_AV_MEDIA_STATE_IDLE;
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esp_bt_gap_set_scan_mode(ESP_BT_SCAN_MODE_NONE);
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} else if (a2d->conn_stat.state == ESP_A2D_CONNECTION_STATE_DISCONNECTED) {
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s_a2d_state = APP_AV_STATE_UNCONNECTED;
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}
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break;
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}
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case ESP_A2D_AUDIO_STATE_EVT:
|
|
case ESP_A2D_AUDIO_CFG_EVT:
|
|
case ESP_A2D_MEDIA_CTRL_ACK_EVT:
|
|
break;
|
|
case BT_APP_HEART_BEAT_EVT:
|
|
if (++s_connecting_intv >= 2) {
|
|
s_a2d_state = APP_AV_STATE_UNCONNECTED;
|
|
s_connecting_intv = 0;
|
|
}
|
|
break;
|
|
default:
|
|
ESP_LOGE(BT_AV_TAG, "%s unhandled evt %d", __func__, event);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void bt_app_av_media_proc(uint16_t event, void *param)
|
|
{
|
|
esp_a2d_cb_param_t *a2d = NULL;
|
|
switch (s_media_state) {
|
|
case APP_AV_MEDIA_STATE_IDLE: {
|
|
if (event == BT_APP_HEART_BEAT_EVT) {
|
|
ESP_LOGI(BT_AV_TAG, "a2dp media ready checking ...");
|
|
esp_a2d_media_ctrl(ESP_A2D_MEDIA_CTRL_CHECK_SRC_RDY);
|
|
} else if (event == ESP_A2D_MEDIA_CTRL_ACK_EVT) {
|
|
a2d = (esp_a2d_cb_param_t *)(param);
|
|
if (a2d->media_ctrl_stat.cmd == ESP_A2D_MEDIA_CTRL_CHECK_SRC_RDY &&
|
|
a2d->media_ctrl_stat.status == ESP_A2D_MEDIA_CTRL_ACK_SUCCESS) {
|
|
ESP_LOGI(BT_AV_TAG, "a2dp media ready, starting ...");
|
|
esp_a2d_media_ctrl(ESP_A2D_MEDIA_CTRL_START);
|
|
s_media_state = APP_AV_MEDIA_STATE_STARTING;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case APP_AV_MEDIA_STATE_STARTING: {
|
|
if (event == ESP_A2D_MEDIA_CTRL_ACK_EVT) {
|
|
a2d = (esp_a2d_cb_param_t *)(param);
|
|
if (a2d->media_ctrl_stat.cmd == ESP_A2D_MEDIA_CTRL_START &&
|
|
a2d->media_ctrl_stat.status == ESP_A2D_MEDIA_CTRL_ACK_SUCCESS) {
|
|
ESP_LOGI(BT_AV_TAG, "a2dp media start successfully.");
|
|
s_intv_cnt = 0;
|
|
s_media_state = APP_AV_MEDIA_STATE_STARTED;
|
|
} else {
|
|
// not started succesfully, transfer to idle state
|
|
ESP_LOGI(BT_AV_TAG, "a2dp media start failed.");
|
|
s_media_state = APP_AV_MEDIA_STATE_IDLE;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case APP_AV_MEDIA_STATE_STARTED: {
|
|
if (event == BT_APP_HEART_BEAT_EVT) {
|
|
if (++s_intv_cnt >= 10) {
|
|
ESP_LOGI(BT_AV_TAG, "a2dp media stopping...");
|
|
esp_a2d_media_ctrl(ESP_A2D_MEDIA_CTRL_STOP);
|
|
s_media_state = APP_AV_MEDIA_STATE_STOPPING;
|
|
s_intv_cnt = 0;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case APP_AV_MEDIA_STATE_STOPPING: {
|
|
if (event == ESP_A2D_MEDIA_CTRL_ACK_EVT) {
|
|
a2d = (esp_a2d_cb_param_t *)(param);
|
|
if (a2d->media_ctrl_stat.cmd == ESP_A2D_MEDIA_CTRL_STOP &&
|
|
a2d->media_ctrl_stat.status == ESP_A2D_MEDIA_CTRL_ACK_SUCCESS) {
|
|
ESP_LOGI(BT_AV_TAG, "a2dp media stopped successfully, disconnecting...");
|
|
s_media_state = APP_AV_MEDIA_STATE_IDLE;
|
|
esp_a2d_source_disconnect(s_peer_bda);
|
|
s_a2d_state = APP_AV_STATE_DISCONNECTING;
|
|
} else {
|
|
ESP_LOGI(BT_AV_TAG, "a2dp media stopping...");
|
|
esp_a2d_media_ctrl(ESP_A2D_MEDIA_CTRL_STOP);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void bt_app_av_state_connected(uint16_t event, void *param)
|
|
{
|
|
esp_a2d_cb_param_t *a2d = NULL;
|
|
switch (event) {
|
|
case ESP_A2D_CONNECTION_STATE_EVT: {
|
|
a2d = (esp_a2d_cb_param_t *)(param);
|
|
if (a2d->conn_stat.state == ESP_A2D_CONNECTION_STATE_DISCONNECTED) {
|
|
ESP_LOGI(BT_AV_TAG, "a2dp disconnected");
|
|
s_a2d_state = APP_AV_STATE_UNCONNECTED;
|
|
esp_bt_gap_set_scan_mode(ESP_BT_SCAN_MODE_CONNECTABLE_DISCOVERABLE);
|
|
}
|
|
break;
|
|
}
|
|
case ESP_A2D_AUDIO_STATE_EVT: {
|
|
a2d = (esp_a2d_cb_param_t *)(param);
|
|
if (ESP_A2D_AUDIO_STATE_STARTED == a2d->audio_stat.state) {
|
|
s_pkt_cnt = 0;
|
|
}
|
|
break;
|
|
}
|
|
case ESP_A2D_AUDIO_CFG_EVT:
|
|
// not suppposed to occur for A2DP source
|
|
break;
|
|
case ESP_A2D_MEDIA_CTRL_ACK_EVT:
|
|
case BT_APP_HEART_BEAT_EVT: {
|
|
bt_app_av_media_proc(event, param);
|
|
break;
|
|
}
|
|
default:
|
|
ESP_LOGE(BT_AV_TAG, "%s unhandled evt %d", __func__, event);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void bt_app_av_state_disconnecting(uint16_t event, void *param)
|
|
{
|
|
esp_a2d_cb_param_t *a2d = NULL;
|
|
switch (event) {
|
|
case ESP_A2D_CONNECTION_STATE_EVT: {
|
|
a2d = (esp_a2d_cb_param_t *)(param);
|
|
if (a2d->conn_stat.state == ESP_A2D_CONNECTION_STATE_DISCONNECTED) {
|
|
ESP_LOGI(BT_AV_TAG, "a2dp disconnected");
|
|
s_a2d_state = APP_AV_STATE_UNCONNECTED;
|
|
esp_bt_gap_set_scan_mode(ESP_BT_SCAN_MODE_CONNECTABLE_DISCOVERABLE);
|
|
}
|
|
break;
|
|
}
|
|
case ESP_A2D_AUDIO_STATE_EVT:
|
|
case ESP_A2D_AUDIO_CFG_EVT:
|
|
case ESP_A2D_MEDIA_CTRL_ACK_EVT:
|
|
case BT_APP_HEART_BEAT_EVT:
|
|
break;
|
|
default:
|
|
ESP_LOGE(BT_AV_TAG, "%s unhandled evt %d", __func__, event);
|
|
break;
|
|
}
|
|
}
|