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main.c
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main.c
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
#include "esp_log.h"
#include "nvs_flash.h"
#include "freertos/FreeRTOSConfig.h"
/* BLE */
#include "nimble/nimble_port.h"
#include "nimble/nimble_port_freertos.h"
#include "host/ble_hs.h"
#include "host/util/util.h"
#include "console/console.h"
#include "services/gap/ble_svc_gap.h"
#include "blehr_sens.h"
static const char *tag = "NimBLE_BLE_HeartRate";
static TimerHandle_t blehr_tx_timer;
static bool notify_state;
static uint16_t conn_handle;
static const char *device_name = "blehr_sensor_1.0";
static int blehr_gap_event(struct ble_gap_event *event, void *arg);
static uint8_t blehr_addr_type;
/* Variable to simulate heart beats */
static uint8_t heartrate = 90;
/**
* Utility function to log an array of bytes.
*/
void
print_bytes(const uint8_t *bytes, int len)
{
int i;
for (i = 0; i < len; i++) {
MODLOG_DFLT(INFO, "%s0x%02x", i != 0 ? ":" : "", bytes[i]);
}
}
void
print_addr(const void *addr)
{
const uint8_t *u8p;
u8p = addr;
MODLOG_DFLT(INFO, "%02x:%02x:%02x:%02x:%02x:%02x",
u8p[5], u8p[4], u8p[3], u8p[2], u8p[1], u8p[0]);
}
/*
* Enables advertising with parameters:
* o General discoverable mode
* o Undirected connectable mode
*/
static void
blehr_advertise(void)
{
struct ble_gap_adv_params adv_params;
struct ble_hs_adv_fields fields;
int rc;
/*
* Set the advertisement data included in our advertisements:
* o Flags (indicates advertisement type and other general info)
* o Advertising tx power
* o Device name
*/
memset(&fields, 0, sizeof(fields));
/*
* Advertise two flags:
* o Discoverability in forthcoming advertisement (general)
* o BLE-only (BR/EDR unsupported)
*/
fields.flags = BLE_HS_ADV_F_DISC_GEN |
BLE_HS_ADV_F_BREDR_UNSUP;
/*
* Indicate that the TX power level field should be included; have the
* stack fill this value automatically. This is done by assigning the
* special value BLE_HS_ADV_TX_PWR_LVL_AUTO.
*/
fields.tx_pwr_lvl_is_present = 1;
fields.tx_pwr_lvl = BLE_HS_ADV_TX_PWR_LVL_AUTO;
fields.name = (uint8_t *)device_name;
fields.name_len = strlen(device_name);
fields.name_is_complete = 1;
rc = ble_gap_adv_set_fields(&fields);
if (rc != 0) {
MODLOG_DFLT(ERROR, "error setting advertisement data; rc=%d\n", rc);
return;
}
/* Begin advertising */
memset(&adv_params, 0, sizeof(adv_params));
adv_params.conn_mode = BLE_GAP_CONN_MODE_UND;
adv_params.disc_mode = BLE_GAP_DISC_MODE_GEN;
rc = ble_gap_adv_start(blehr_addr_type, NULL, BLE_HS_FOREVER,
&adv_params, blehr_gap_event, NULL);
if (rc != 0) {
MODLOG_DFLT(ERROR, "error enabling advertisement; rc=%d\n", rc);
return;
}
}
static void
blehr_tx_hrate_stop(void)
{
xTimerStop( blehr_tx_timer, 1000 / portTICK_PERIOD_MS );
}
/* Reset heart rate measurement */
static void
blehr_tx_hrate_reset(void)
{
int rc;
if (xTimerReset(blehr_tx_timer, 1000 / portTICK_PERIOD_MS ) == pdPASS) {
rc = 0;
} else {
rc = 1;
}
assert(rc == 0);
}
/* This function simulates heart beat and notifies it to the client */
static void
blehr_tx_hrate(TimerHandle_t ev)
{
static uint8_t hrm[2];
int rc;
struct os_mbuf *om;
if (!notify_state) {
blehr_tx_hrate_stop();
heartrate = 90;
return;
}
hrm[0] = 0x06; /* contact of a sensor */
hrm[1] = heartrate; /* storing dummy data */
/* Simulation of heart beats */
heartrate++;
if (heartrate == 160) {
heartrate = 90;
}
om = ble_hs_mbuf_from_flat(hrm, sizeof(hrm));
rc = ble_gatts_notify_custom(conn_handle, hrs_hrm_handle, om);
assert(rc == 0);
blehr_tx_hrate_reset();
}
static int
blehr_gap_event(struct ble_gap_event *event, void *arg)
{
switch (event->type) {
case BLE_GAP_EVENT_CONNECT:
/* A new connection was established or a connection attempt failed */
MODLOG_DFLT(INFO, "connection %s; status=%d\n",
event->connect.status == 0 ? "established" : "failed",
event->connect.status);
if (event->connect.status != 0) {
/* Connection failed; resume advertising */
blehr_advertise();
}
conn_handle = event->connect.conn_handle;
break;
case BLE_GAP_EVENT_DISCONNECT:
MODLOG_DFLT(INFO, "disconnect; reason=%d\n", event->disconnect.reason);
/* Connection terminated; resume advertising */
blehr_advertise();
break;
case BLE_GAP_EVENT_ADV_COMPLETE:
MODLOG_DFLT(INFO, "adv complete\n");
blehr_advertise();
break;
case BLE_GAP_EVENT_SUBSCRIBE:
MODLOG_DFLT(INFO, "subscribe event; cur_notify=%d\n value handle; "
"val_handle=%d\n",
event->subscribe.cur_notify, hrs_hrm_handle);
if (event->subscribe.attr_handle == hrs_hrm_handle) {
notify_state = event->subscribe.cur_notify;
blehr_tx_hrate_reset();
} else if (event->subscribe.attr_handle != hrs_hrm_handle) {
notify_state = event->subscribe.cur_notify;
blehr_tx_hrate_stop();
}
ESP_LOGI("BLE_GAP_SUBSCRIBE_EVENT", "conn_handle from subscribe=%d", conn_handle);
break;
case BLE_GAP_EVENT_MTU:
MODLOG_DFLT(INFO, "mtu update event; conn_handle=%d mtu=%d\n",
event->mtu.conn_handle,
event->mtu.value);
break;
}
return 0;
}
static void
blehr_on_sync(void)
{
int rc;
rc = ble_hs_id_infer_auto(0, &blehr_addr_type);
assert(rc == 0);
uint8_t addr_val[6] = {0};
rc = ble_hs_id_copy_addr(blehr_addr_type, addr_val, NULL);
MODLOG_DFLT(INFO, "Device Address: ");
print_addr(addr_val);
MODLOG_DFLT(INFO, "\n");
/* Begin advertising */
blehr_advertise();
}
static void
blehr_on_reset(int reason)
{
MODLOG_DFLT(ERROR, "Resetting state; reason=%d\n", reason);
}
void blehr_host_task(void *param)
{
ESP_LOGI(tag, "BLE Host Task Started");
/* This function will return only when nimble_port_stop() is executed */
nimble_port_run();
nimble_port_freertos_deinit();
}
void app_main(void)
{
int rc;
/* Initialize NVS — it is used to store PHY calibration data */
esp_err_t ret = nvs_flash_init();
if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
ESP_ERROR_CHECK(nvs_flash_erase());
ret = nvs_flash_init();
}
ESP_ERROR_CHECK(ret);
ret = nimble_port_init();
if (ret != ESP_OK) {
MODLOG_DFLT(ERROR, "Failed to init nimble %d \n", ret);
return;
}
/* Initialize the NimBLE host configuration */
ble_hs_cfg.sync_cb = blehr_on_sync;
ble_hs_cfg.reset_cb = blehr_on_reset;
/* name, period/time, auto reload, timer ID, callback */
blehr_tx_timer = xTimerCreate("blehr_tx_timer", pdMS_TO_TICKS(1000), pdTRUE, (void *)0, blehr_tx_hrate);
rc = gatt_svr_init();
assert(rc == 0);
/* Set the default device name */
rc = ble_svc_gap_device_name_set(device_name);
assert(rc == 0);
/* Start the task */
nimble_port_freertos_init(blehr_host_task);
}