【XR806开发板试用】评测三 蓝牙透传(单向)

评测三 蓝牙透传(单向)

有时无线透传在无法布线时有很方便的效用，不妨试试蓝牙透传，具体是无线数据->串口数据，串口数据->无线数据，目前前者实现了，后者还有些问题未解决，

实现过程如下，基于工程demo/Bluetooth/peripheral_demo改成peripheral_uart_demo，同时目录下peripheral_uart_demo/gcc/defconfig文件里工程名也改成peripheral_uart_demo，然后引入串口读写独立接口即把demo/at_demo下的serial.c、serial.h、serial_debug.h复制到刚才peripheral_uart_demo工程下，由于要无线写以及串口写转无线，所以profile涉及到write_without_rsp和notify，具体配置为：

static struct bt_gatt_attr vnd_attrs[] = {
    /* Vendor Primary Service Declaration */
    BT_GATT_PRIMARY_SERVICE(&vnd_uuid),
    BT_GATT_CHARACTERISTIC(&vnd_enc_uuid.uuid,
                    BT_GATT_CHRC_WRITE_WITHOUT_RESP | BT_GATT_CHRC_NOTIFY,
                    BT_GATT_PERM_WRITE,
                    NULL, write_without_rsp_vnd, &vnd_value),
    BT_GATT_CCC(vnd_ccc_notify_changed, BT_GATT_PERM_READ|BT_GATT_PERM_WRITE),
};

写回调接口为：

/**********************vnd_write_cmd_uuid*****************************/
static ssize_t write_without_rsp_vnd(struct bt_conn *conn,
                const struct bt_gatt_attr *attr,
                const void *buf, uint16_t len, uint16_t offset,
                uint8_t flags)
{
    uint8_t *value = attr->user_data;

    /* Write request received. Reject it since this char only accepts
     * Write Commands.
     */
    if (!(flags & BT_GATT_WRITE_FLAG_CMD)) {
        return BT_GATT_ERR(BT_ATT_ERR_WRITE_REQ_REJECTED);
    }

    if (offset + len > sizeof(vnd_value)) {
        return BT_GATT_ERR(BT_ATT_ERR_INVALID_OFFSET);
    }

    memset(value, 0, sizeof(vnd_value));
    memcpy(value + offset, buf, len);
    serial_write(value + offset, len);
    *(value + offset + len) = '\0';
    printf("\r\nwrite_without_rsp_vnd");
    return len;
}

串口转无线回调（有问题）：

static void vnd_notify(void)
{
    static uint8_t vnd[MAX_LONG_DATA];
    uint16_t len=0;
    if (!vnd_notif_enabled)
        return;
    printf("\r\nnotify\r\n");
    serial_read(vnd_notify_value,len);
    if(len>MAX_LONG_DATA || len==0)
        return;
    memcpy(vnd, vnd_notify_value, len);
    printf("\r\nvnd_notify\r\n");
    bt_gatt_notify(NULL, &vnd_svc.attrs[1], vnd, sizeof(vnd));
}

然后在bt_app_init函数里加入透传口UART1的初始化代码即可：

    serial_init(SERIAL_UART_ID, 115200, UART_DATA_BITS_8, UART_PARITY_NONE,UART_STOP_BITS_1, 0);
    serial_start();