@TOC

W801 蓝牙收发数据与控制设计 (一) -INDICATE
W801 蓝牙收发数据与控制设计 (二) -NOTIFY 方式

本文使用环境:
主控: W801 (开发板)
兼容: W800 AIR101

一, 项目概述

^^^^这篇教程接着上文继续介绍 W801 的 BT 使用, 上文使用 INDICATE 方式进行数据的收发, 这篇文章主要采用 NOTIFY 方式进行数据收发. 具体 Indicate 和 Notify 的区别, 可以自己查一下, 我也不是很了解这个东西. 好像是 (indicate 发送接收端有应答, notify 接收端无应答) .

^^^^程序功能: 和上文差不多, 区别在于Indicate 和 Notify不一样.

二, 程序设计

写在前面: 本文的程序是在上文的基础上做的改进, 所以必须下载前文的程序.

==以下代码均在wm_ble_server_api_demo. c中添加. ==

1, 先添加宏定义, 关于 notify 主要有两个地方, 如下:

/* ble attr write/notify handle */
uint16_t g_ble_demo_attr_indicate_handle; 
uint16_t g_ble_demo_attr_write_handle; 
uint16_t g_ble_demo_conn_handle ; 

//add by zxx start
uint16_t g_ble_demo_attr_notify_handle; 
//add by zxx end

#define WM_GATT_SVC_UUID      0xFFF0
#define WM_GATT_INDICATE_UUID 0xFFF1
#define WM_GATT_WRITE_UUID    0xFFF2

//add by zxx start
#define WM_GATT_NOTIFY_UUID   0xFFF3
//add by zxx end

2, 官方的 demo 中只有WRITE 和 INDICATE, 因此添加代码 characteristics :

//notify_test 函数没有任何的作用,  不添加蓝牙 notify 方式初始化会失败.  
static int notify_test () 
{
    ; 
}
static const struct ble_gatt_svc_def gatt_demo_svr_svcs[] = {
    {
        /* Service:  uart */
        . type = BLE_GATT_SVC_TYPE_PRIMARY, 
        . uuid = BLE_UUID16_DECLARE (WM_GATT_SVC_UUID) , 
        . characteristics =  (struct ble_gatt_chr_def[])  { {
                . uuid = BLE_UUID16_DECLARE (WM_GATT_WRITE_UUID) , 
                . val_handle = &g_ble_demo_attr_write_handle, 
                . access_cb = gatt_svr_chr_demo_access_func, 
                . flags = BLE_GATT_CHR_F_WRITE, 
            }, {
                . uuid = BLE_UUID16_DECLARE (WM_GATT_INDICATE_UUID) , 
                . val_handle = &g_ble_demo_attr_indicate_handle, 
                . access_cb = gatt_svr_chr_demo_access_func, 
                . flags = BLE_GATT_CHR_F_INDICATE, 
            }
            //add by zxx start
            , {
                . uuid = BLE_UUID16_DECLARE (WM_GATT_NOTIFY_UUID) , 
                . val_handle = &g_ble_demo_attr_notify_handle, 
                //这个函数不会调用,  但是必须要有,  
                . access_cb = notify_test, 
                . flags = BLE_GATT_CHR_F_NOTIFY, 
            }
            //add by zxx end
            , {
              0,  /* No more characteristics in this service */
            } 
         }, 
    }, 

    {
        0,  /* No more services */
    }, 
}; 

3, 添加tls_ble_server_demo_api_send_notify_msg 函数, 只需仿照tls_ble_server_demo_api_send_msg函数进行修改即可.

//add by zxx start
int tls_ble_server_demo_api_send_notify_msg (uint8_t *data,  int data_len) 
{
    int rc; 
    struct os_mbuf *om; 
    
    //TLS_BT_APPL_TRACE_DEBUG ("### %s len=%d\r\n",  __FUNCTION__,  data_len) ; 
    //这句话要注释掉,  要不然这个代码的逻辑不对
    //if (g_send_pending)  return BLE_HS_EBUSY; 

    if (data_len =0 || data == NULL) 
    {
        return BLE_HS_EINVAL; 
    }
    
    om = ble_hs_mbuf_from_flat (data,  data_len) ; 
    if  (! om)  {
        return BLE_HS_ENOMEM; 
    }
    //参数 g_ble_demo_attr_notify_handle 句柄要和 characteristics 的句柄一样
    rc = ble_gattc_notify_custom (g_ble_demo_conn_handle, g_ble_demo_attr_notify_handle,  om) ;  
    //这句话注释不注释都可以,  我注释了
    /*
    if (rc == 0) 
    {
        g_send_pending = 1; 
    }
    */
    return rc; 
}
//add by zxx end

二, 测试

1, app 端配置
按照如图所示进行配置, ==注意 TX 是 xxxf3, RX 是 xxxf2==. 配置完成正常收发程序即可.

其他测试步骤和上文一样, 不再赘述.