nrf52832 ble-lbs.c说明

硕果累累 · 发表于 2021-11-24 21:02:24

/**
*
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form, except as embedded into a Nordic
* Semiconductor ASA integrated circuit in a product or a software update for
* such product, must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* 4. This software, with or without modification, must only be used with a
* Nordic Semiconductor ASA integrated circuit.
*
* 5. Any software provided in binary form under this license must not be reverse
* engineered, decompiled, modified and/or disassembled.
*
* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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*/
#include "sdk_common.h"
#if NRF_MODULE_ENABLED(BLE_LBS)
#include "ble_lbs.h"
#include "ble_srv_common.h"
/**@brief Function for handling the Write event.函数处理Write事件。
*
* @param[in] p_lbs LED Button Service structure.LED按键业务结构。
* @param[in] p_ble_evt Event received from the BLE stack.从BLE堆栈接收到的事件
*/
//处理Write事件的函数。该事件来自主机(GATTC)的Write写特征值
//p_led -> led服务结构体
//p_ble_evt -> ble事件
static void on_write(ble_lbs_t * p_lbs, ble_evt_t const * p_ble_evt)
{
ble_gatts_evt_write_t const * p_evt_write = &p_ble_evt->evt.gatts_evt.params.write;
//参数判断和筛选
if ( (p_evt_write->handle == p_lbs->led_char_handles.value_handle)
&& (p_evt_write->len == 1)
&& (p_lbs->led_write_handler != NULL))
{
//调用mainc中service_init函数设置的处理函数。并传递从无线端接收到的数据。
p_lbs->led_write_handler(p_ble_evt->evt.gap_evt.conn_handle, p_lbs, p_evt_write->data[0]);
}
}
//BLE事件处理函数
//p_ble_evt -> ble事件
//p_context -> ble事件处理程序的参数（暂时理解应该是不同的功能，注册时所携带的结构体参数）
void ble_lbs_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context)
{
ble_lbs_t * p_lbs = (ble_lbs_t *)p_context;
switch (p_ble_evt->header.evt_id)
{
// GATTClient的Write事件，本从机里对应为GATTS(Server端)
case BLE_GATTS_EVT_WRITE://产生GATT写事件
on_write(p_lbs, p_ble_evt);
break;
default:
// No implementation needed.
break;
}
}
/**@brief Function for adding the LED Characteristic.增加LED特性功能。
*
* @param[in] p_lbs LED Button Service structure.
* @param[in] p_lbs_init LED Button Service initialization structure.
*
* @retval NRF_SUCCESS on success, else an error value from the SoftDevice
*/
static uint32_t led_char_add(ble_lbs_t * p_lbs, const ble_lbs_init_t * p_lbs_init)
{
ble_gatts_char_md_t char_md;
ble_gatts_attr_t attr_char_value;
ble_uuid_t ble_uuid;
ble_gatts_attr_md_t attr_md;
memset(&char_md, 0, sizeof(char_md));
char_md.char_props.read = 1;
char_md.char_props.write = 1;
char_md.p_char_user_desc = NULL;
char_md.p_char_pf = NULL;
char_md.p_user_desc_md = NULL;
char_md.p_cccd_md = NULL;
char_md.p_sccd_md = NULL;
ble_uuid.type = p_lbs->uuid_type;
ble_uuid.uuid = LBS_UUID_LED_CHAR;
memset(&attr_md, 0, sizeof(attr_md));
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.read_perm);
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.write_perm);
attr_md.vloc = BLE_GATTS_VLOC_STACK;
attr_md.rd_auth = 0;
attr_md.wr_auth = 0;
attr_md.vlen = 0;
memset(&attr_char_value, 0, sizeof(attr_char_value));
attr_char_value.p_uuid = &ble_uuid;
attr_char_value.p_attr_md = &attr_md;
attr_char_value.init_len = sizeof(uint8_t);
attr_char_value.init_offs = 0;
attr_char_value.max_len = sizeof(uint8_t);
attr_char_value.p_value = NULL;
//调用特征添加方法，把我们的特征添加到服务里面去，所以这里的第一个参数为我们建立的服务的句柄，上面得到的
//第2个参数为我们为特征配置的一些基本信息，第3个参数为返回值，得到的是特征的句柄，保存到我们的结构体中。
return sd_ble_gatts_characteristic_add(p_lbs->service_handle,
&char_md,
&attr_char_value,
&p_lbs->led_char_handles);
}
/**@brief Function for adding the Button Characteristic.
*
* @param[in] p_lbs LED Button Service structure.
* @param[in] p_lbs_init LED Button Service initialization structure.
*
* @retval NRF_SUCCESS on success, else an error value from the SoftDevice
*/
static uint32_t button_char_add(ble_lbs_t * p_lbs, const ble_lbs_init_t * p_lbs_init)
{
ble_gatts_char_md_t char_md;
ble_gatts_attr_md_t cccd_md;
ble_gatts_attr_t attr_char_value;
ble_uuid_t ble_uuid;
ble_gatts_attr_md_t attr_md;
memset(&cccd_md, 0, sizeof(cccd_md));
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.read_perm);
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.write_perm);
cccd_md.vloc = BLE_GATTS_VLOC_STACK;
memset(&char_md, 0, sizeof(char_md));
char_md.char_props.read = 1;
char_md.char_props.notify = 1;
char_md.p_char_user_desc = NULL;
char_md.p_char_pf = NULL;
char_md.p_user_desc_md = NULL;
char_md.p_cccd_md = &cccd_md;
char_md.p_sccd_md = NULL;
ble_uuid.type = p_lbs->uuid_type;
ble_uuid.uuid = LBS_UUID_BUTTON_CHAR;
memset(&attr_md, 0, sizeof(attr_md));
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.read_perm);
BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&attr_md.write_perm);
attr_md.vloc = BLE_GATTS_VLOC_STACK;
attr_md.rd_auth = 0;
attr_md.wr_auth = 0;
attr_md.vlen = 0;
memset(&attr_char_value, 0, sizeof(attr_char_value));
attr_char_value.p_uuid = &ble_uuid;
attr_char_value.p_attr_md = &attr_md;
attr_char_value.init_len = sizeof(uint8_t);
attr_char_value.init_offs = 0;
attr_char_value.max_len = sizeof(uint8_t);
attr_char_value.p_value = NULL;
return sd_ble_gatts_characteristic_add(p_lbs->service_handle,
&char_md,
&attr_char_value,
&p_lbs->button_char_handles);
}
//主要来看ble_lbs_init,此函数目的是增加led及button的相关Service Characteristic等
uint32_t ble_lbs_init(ble_lbs_t * p_lbs, const ble_lbs_init_t * p_lbs_init)
{
uint32_t err_code;
ble_uuid_t ble_uuid;
// Initialize service structure.初始化服务結構體
p_lbs->led_write_handler = p_lbs_init->led_write_handler;
// Add service.添加服务（128bit UUID)
ble_uuid128_t base_uuid = {LBS_UUID_BASE};
//这个函数的功能是得到要给UUID的类型，写法基本上是固定的，第二个参数是得到UUDI_TYPE的类型
err_code = sd_ble_uuid_vs_add(&base_uuid, &p_lbs->uuid_type);
VERIFY_SUCCESS(err_code);
ble_uuid.type = p_lbs->uuid_type;
ble_uuid.uuid = LBS_UUID_SERVICE;
//注册服务，作为主服务，传入我们刚才生成的UUID结构体，第三个参数作为返回的服务的句柄，我们保存到们的m_led结构体中
err_code = sd_ble_gatts_service_add(BLE_GATTS_SRVC_TYPE_PRIMARY, &ble_uuid, &p_lbs->service_handle);
VERIFY_SUCCESS(err_code);
// Add characteristics.添加特征值
err_code = button_char_add(p_lbs, p_lbs_init);
VERIFY_SUCCESS(err_code);
err_code = led_char_add(p_lbs, p_lbs_init);
VERIFY_SUCCESS(err_code);
return NRF_SUCCESS;
}
uint32_t ble_lbs_on_button_change(uint16_t conn_handle, ble_lbs_t * p_lbs, uint8_t button_state)
{
ble_gatts_hvx_params_t params;
uint16_t len = sizeof(button_state);
memset(¶ms, 0, sizeof(params));
params.type = BLE_GATT_HVX_NOTIFICATION;
params.handle = p_lbs->button_char_handles.value_handle;
params.p_data = &button_state;
params.p_len = &len;
return sd_ble_gatts_hvx(conn_handle, ¶ms);
}
#endif // NRF_MODULE_ENABLED(BLE_LBS)

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