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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"
/* BLE */
#include "console/console.h"
#include "nimble/ble.h"
#include "host/ble_hs.h"
#include "services/gap/ble_svc_gap.h"
#include "blecsc_sens.h"
#include "nimble/nimble_port.h"
#include "nimble/nimble_port_freertos.h"
#if CONFIG_EXAMPLE_EXTENDED_ADV
static uint8_t ext_adv_pattern_1[] = {
0x02, 0x01, 0x06,
0x03, 0x03, 0xab, 0xcd,
0x03, 0x03, 0x18, 0x11,
0x10, 0X09, 'n', 'i', 'm', 'b', 'l', 'e', '-', 'b', 'l', 'e', 'c', 's', 'c','-', 'e',
};
#endif
/* Wheel size for simulation calculations */
#define CSC_SIM_WHEEL_CIRCUMFERENCE_MM 2000
/* Simulated cadence lower limit */
#define CSC_SIM_CRANK_RPM_MIN 20
/* Simulated cadence upper limit */
#define CSC_SIM_CRANK_RPM_MAX 100
/* Simulated speed lower limit */
#define CSC_SIM_SPEED_KPH_MIN 0
/* Simulated speed upper limit */
#define CSC_SIM_SPEED_KPH_MAX 35
/* Notification status */
static bool notify_state = false;
/* Connection handle */
static uint16_t conn_handle;
static uint8_t blecsc_addr_type;
/* Advertised device name */
static const char *device_name = "blecsc_sensor";
/* Measurement and notification timer */
static struct ble_npl_callout blecsc_measure_timer;
/* Variable holds current CSC measurement state */
static struct ble_csc_measurement_state csc_measurement_state;
/* Variable holds simulated speed (kilometers per hour) */
static uint16_t csc_sim_speed_kph = CSC_SIM_SPEED_KPH_MIN;
/* Variable holds simulated cadence (RPM) */
static uint8_t csc_sim_crank_rpm = CSC_SIM_CRANK_RPM_MIN;
static int blecsc_gap_event(struct ble_gap_event *event, void *arg);
static const char *tag = "NimBLE_BLE_CSC";
/*
* Enables advertising with parameters:
* o General discoverable mode
* o Undirected connectable mode
*/
static void
blecsc_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;
/*
* Set appearance.
*/
fields.appearance = ble_svc_gap_device_appearance();
fields.appearance_is_present = 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(blecsc_addr_type, NULL, BLE_HS_FOREVER,
&adv_params, blecsc_gap_event, NULL);
if (rc != 0) {
MODLOG_DFLT(ERROR, "error enabling advertisement; rc=%d\n", rc);
return;
}
}
/* Update simulated CSC measurements.
* Each call increments wheel and crank revolution counters by one and
* computes last event time in order to match simulated candence and speed.
* Last event time is expressedd in 1/1024th of second units.
*
* 60 * 1024
* crank_dt = --------------
* cadence[RPM]
*
*
* circumference[mm] * 1024 * 60 * 60
* wheel_dt = -------------------------------------
* 10^6 * speed [kph]
*/
static void
blecsc_simulate_speed_and_cadence(void)
{
uint16_t wheel_rev_period;
uint16_t crank_rev_period;
/* Update simulated crank and wheel rotation speed */
csc_sim_speed_kph++;
if (csc_sim_speed_kph >= CSC_SIM_SPEED_KPH_MAX) {
csc_sim_speed_kph = CSC_SIM_SPEED_KPH_MIN;
}
csc_sim_crank_rpm++;
if (csc_sim_crank_rpm >= CSC_SIM_CRANK_RPM_MAX) {
csc_sim_crank_rpm = CSC_SIM_CRANK_RPM_MIN;
}
/* Calculate simulated measurement values */
if (csc_sim_speed_kph > 0){
wheel_rev_period = (36*64*CSC_SIM_WHEEL_CIRCUMFERENCE_MM) /
(625*csc_sim_speed_kph);
csc_measurement_state.cumulative_wheel_rev++;
csc_measurement_state.last_wheel_evt_time += wheel_rev_period;
}
if (csc_sim_crank_rpm > 0){
crank_rev_period = (60*1024) / csc_sim_crank_rpm;
csc_measurement_state.cumulative_crank_rev++;
csc_measurement_state.last_crank_evt_time += crank_rev_period;
}
MODLOG_DFLT(INFO, "CSC simulated values: speed = %d kph, cadence = %d \n",
csc_sim_speed_kph, csc_sim_crank_rpm);
}
/* Run CSC measurement simulation and notify it to the client */
static void
blecsc_measurement(struct ble_npl_event *ev)
{
int rc;
rc = ble_npl_callout_reset(&blecsc_measure_timer, portTICK_PERIOD_MS * 10);
assert(rc == 0);
blecsc_simulate_speed_and_cadence();
if (notify_state) {
rc = gatt_svr_chr_notify_csc_measurement(conn_handle);
assert(rc == 0);
}
}
static int
blecsc_gap_event(struct ble_gap_event *event, void *arg)
{
switch (event->type) {
case BLE_GAP_EVENT_LINK_ESTAB:
/* A new connection was established or a connection attempt failed */
MODLOG_DFLT(INFO, "connection %s; status=%d\n",
event->link_estab.status == 0 ? "established" : "failed",
event->link_estab.status);
if (event->link_estab.status != 0) {
/* Connection failed; resume advertising */
blecsc_advertise();
conn_handle = 0;
}
else {
conn_handle = event->link_estab.conn_handle;
}
break;
case BLE_GAP_EVENT_DISCONNECT:
MODLOG_DFLT(INFO, "disconnect; reason=%d\n", event->disconnect.reason);
conn_handle = 0;
/* Connection terminated; resume advertising */
blecsc_advertise();
break;
case BLE_GAP_EVENT_ADV_COMPLETE:
MODLOG_DFLT(INFO, "adv complete\n");
break;
case BLE_GAP_EVENT_SUBSCRIBE:
MODLOG_DFLT(INFO, "subscribe event attr_handle=%d\n",
event->subscribe.attr_handle);
if (event->subscribe.attr_handle == csc_measurement_handle) {
notify_state = event->subscribe.cur_notify;
MODLOG_DFLT(INFO, "csc measurement notify state = %d\n",
notify_state);
}
else if (event->subscribe.attr_handle == csc_control_point_handle) {
gatt_svr_set_cp_indicate(event->subscribe.cur_indicate);
MODLOG_DFLT(INFO, "csc control point indicate state = %d\n",
event->subscribe.cur_indicate);
}
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
blecsc_on_sync(void)
{
int rc;
/* Figure out address to use while advertising (no privacy) */
rc = ble_hs_id_infer_auto(0, &blecsc_addr_type);
assert(rc == 0);
/* Begin advertising */
blecsc_advertise();
}
void blecsc_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();
}
/*
* main
*
* The main task for the project. This function initializes the packages,
* then starts serving events from default event queue.
*
* @return int NOTE: this function should never return!
*/
int
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) {
ESP_LOGE(tag, "Failed to init nimble %d ", ret);
return -1;
}
/* Initialize the NimBLE host configuration */
ble_hs_cfg.sync_cb = blecsc_on_sync;
/* Initialize measurement and notification timer */
ble_npl_callout_init(&blecsc_measure_timer, nimble_port_get_dflt_eventq(),
blecsc_measurement, NULL);
rc = ble_npl_callout_reset(&blecsc_measure_timer, portTICK_PERIOD_MS * 100);
assert(rc == 0);
rc = gatt_svr_init(&csc_measurement_state);
assert(rc == 0);
/* Set the default device name */
rc = ble_svc_gap_device_name_set(device_name);
assert(rc == 0);
nimble_port_freertos_init(blecsc_host_task);
return 0;
}
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