141 lines
3.9 KiB
C
141 lines
3.9 KiB
C
/** @file
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* @brief GATT Battery Service
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*/
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/*
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* Copyright (c) 2024 Demant A/S
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* Copyright (c) 2018 Nordic Semiconductor ASA
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* Copyright (c) 2016 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <errno.h>
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#include <zephyr/init.h>
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#include <zephyr/sys/__assert.h>
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#include <stdbool.h>
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#include <zephyr/types.h>
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#include <zephyr/sys/util.h>
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#include <zephyr/sys/util_macro.h>
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#include <zephyr/bluetooth/bluetooth.h>
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#include <zephyr/bluetooth/conn.h>
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#include <zephyr/bluetooth/gatt.h>
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#include <zephyr/bluetooth/uuid.h>
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#include <zephyr/bluetooth/services/bas.h>
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#include "bas_internal.h"
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#define LOG_LEVEL CONFIG_BT_BAS_LOG_LEVEL
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#include <zephyr/logging/log.h>
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LOG_MODULE_REGISTER(bas, CONFIG_BT_BAS_LOG_LEVEL);
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static uint8_t battery_level = 100U;
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static void blvl_ccc_cfg_changed(const struct bt_gatt_attr *attr, uint16_t value)
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{
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ARG_UNUSED(attr);
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bool notif_enabled = (value == BT_GATT_CCC_NOTIFY);
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LOG_INF("BAS Notifications %s", notif_enabled ? "enabled" : "disabled");
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}
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#if defined(CONFIG_BT_BAS_BLS)
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static void blvl_status_ccc_cfg_changed(const struct bt_gatt_attr *attr, uint16_t value)
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{
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ARG_UNUSED(attr);
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bool notif_enabled = (value == BT_GATT_CCC_NOTIFY);
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bool ind_enabled = (value == BT_GATT_CCC_INDICATE);
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LOG_INF("BAS Notifications %s", notif_enabled ? "enabled" : "disabled");
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LOG_INF("BAS Indications %s", ind_enabled ? "enabled" : "disabled");
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}
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#endif
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static ssize_t read_blvl(struct bt_conn *conn, const struct bt_gatt_attr *attr, void *buf,
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uint16_t len, uint16_t offset)
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{
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uint8_t lvl8 = battery_level;
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return bt_gatt_attr_read(conn, attr, buf, len, offset, &lvl8, sizeof(lvl8));
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}
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/* Constant values from the Assigned Numbers specification:
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* https://www.bluetooth.com/wp-content/uploads/Files/Specification/Assigned_Numbers.pdf?id=89
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*/
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static const struct bt_gatt_cpf level_cpf = {
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.format = 0x04, /* uint8 */
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.exponent = 0x0,
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.unit = 0x27AD, /* Percentage */
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.name_space = 0x01, /* Bluetooth SIG */
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.description = 0x0106, /* "main" */
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};
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BT_GATT_SERVICE_DEFINE(
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bas, BT_GATT_PRIMARY_SERVICE(BT_UUID_BAS),
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BT_GATT_CHARACTERISTIC(BT_UUID_BAS_BATTERY_LEVEL, BT_GATT_CHRC_READ | BT_GATT_CHRC_NOTIFY,
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BT_GATT_PERM_READ, read_blvl, NULL, NULL),
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BT_GATT_CCC(blvl_ccc_cfg_changed, BT_GATT_PERM_READ | BT_GATT_PERM_WRITE),
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BT_GATT_CPF(&level_cpf),
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#if defined(CONFIG_BT_BAS_BLS)
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BT_GATT_CHARACTERISTIC(BT_UUID_BAS_BATTERY_LEVEL_STATUS,
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BT_GATT_CHRC_READ | BT_GATT_CHRC_NOTIFY | BT_GATT_CHRC_INDICATE,
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BT_GATT_PERM_READ, bt_bas_bls_read_blvl_status, NULL, NULL),
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BT_GATT_CCC(blvl_status_ccc_cfg_changed, BT_GATT_PERM_READ | BT_GATT_PERM_WRITE),
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#endif
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#if defined(CONFIG_BT_BAS_BCS)
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BT_GATT_CHARACTERISTIC(BT_UUID_BAS_BATTERY_CRIT_STATUS,
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BT_GATT_CHRC_READ | BT_GATT_CHRC_INDICATE, BT_GATT_PERM_READ,
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bt_bas_bcs_read_critical_status, NULL, NULL),
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BT_GATT_CCC(bt_bas_bcs_ccc_cfg_changed, BT_GATT_PERM_READ | BT_GATT_PERM_WRITE),
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#endif /* CONFIG_BT_BAS_BCS */
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);
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static int bas_init(void)
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{
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if (IS_ENABLED(CONFIG_BT_BAS_BLS)) {
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/* Initialize the Battery Level Status Module */
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bt_bas_bls_init();
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if (IS_ENABLED(CONFIG_BT_BAS_BLS_IDENTIFIER_PRESENT)) {
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/* Set the identifier only if BT_BAS_BLS_IDENTIFIER_PRESENT is defined */
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bt_bas_bls_set_identifier(level_cpf.description);
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}
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}
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return 0;
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}
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uint8_t bt_bas_get_battery_level(void)
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{
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return battery_level;
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}
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int bt_bas_set_battery_level(uint8_t level)
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{
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int rc;
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if (level > 100U) {
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return -EINVAL;
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}
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battery_level = level;
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rc = bt_gatt_notify(NULL, &bas.attrs[1], &level, sizeof(level));
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if (IS_ENABLED(CONFIG_BT_BAS_BLS_BATTERY_LEVEL_PRESENT)) {
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bt_bas_bls_set_battery_level(level);
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}
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return rc == -ENOTCONN ? 0 : rc;
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}
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const struct bt_gatt_attr *bt_bas_get_bas_attr(uint16_t index)
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{
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if (index < bas.attr_count) {
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return &bas.attrs[index];
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}
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return NULL;
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}
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SYS_INIT(bas_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);
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