《RT-Thread设备驱动开发指南》读书笔记一WLAN设备框架

wakojosin

《RT-Thread设备驱动开发指南》读书笔记一WLAN设备框架 [复制链接]

# 简介 WLAN是一种非常常见的局域网通讯方式，通过WLAN技术可以简化设备的安装，降低设备安装成本，同时也让设备入网更加便捷。Wi-Fi是WLAN的一种协议标准，在日常生活中是非常常见的，支持的设备包括了手机、电脑、路由器、各种各样的智能家居产品。RT-Thread的WLAN设备驱动框架主要是对Wi-Fi设备的支持。 [TOC] # 层级架构 ```flow op1=>operation: WLAN管理框架 op2=>operation: WLAN设备驱动框架 op3=>operation: WLAN设备驱动 op4=>operation: WLAN硬件设备 op1->op2->op3->op4 ``` 管理框架及设备驱动位于components/drivers/wlan目录下，主要文件有： - 存储配置：wlan_cfg - 命令行常用命令：wlan_cmd - TCP/IP报文解析及上报：wlan_lwip - WLAN管理框架：wlan_prot - WLAN设备驱动：wlan_dev ## 注册过程 ```c int wifi_spi_device_init(void) { // spi设备注册 rt_hw_spi_device_attach(RW007_SPI_BUS_NAME, "wspi", RW007_CS_PIN); rt_hw_wifi_init("wspi"); // 设备初始化 rt_wlan_set_mode(RT_WLAN_DEVICE_STA_NAME, RT_WLAN_STATION); rt_wlan_set_mode(RT_WLAN_DEVICE_AP_NAME, RT_WLAN_AP); } INIT_APP_EXPORT(wifi_spi_device_init); rt_err_t rt_wlan_set_mode(const char *dev_name, rt_wlan_mode_t mode) { device = rt_device_find(dev_name); rt_wlan_dev_init(RT_WLAN_DEVICE(device), mode); } rt_err_t rt_wlan_dev_init(struct rt_wlan_device *device, rt_wlan_mode_t mode) { rt_device_init(RT_DEVICE(device)); rt_device_control(RT_DEVICE(device), RT_WLAN_CMD_MODE, (void *)&mode); } #define RT_WLAN_DEVICE_STA_NAME "wlan0" #define RT_WLAN_DEVICE_AP_NAME "wlan1" rt_err_t rt_hw_wifi_init(const char *spi_device_name) { //wlan设备注册 rt_wlan_dev_register(&wlan_ap, RT_WLAN_DEVICE_AP_NAME, &ops, 0, &wifi_ap); rt_wlan_dev_register(&wlan_sta, RT_WLAN_DEVICE_STA_NAME, &ops, 0, &wifi_sta); rt_thread_create("wifi_handle", wifi_data_process_thread_entry, &rw007_spi, 2048, 8, 20); rt_thread_create("wifi_xfer", spi_wifi_data_thread_entry, RT_NULL, 2048, 9, 20); } } rt_err_t rt_wlan_dev_register(struct rt_wlan_device *wlan, const char *name, const struct rt_wlan_dev_ops *ops, rt_uint32_t flag, void *user_data) { wlan->device.init = _rt_wlan_dev_init; wlan->device.open = RT_NULL; wlan->device.close = RT_NULL; wlan->device.read = RT_NULL; wlan->device.write = RT_NULL; wlan->device.control = _rt_wlan_dev_control; wlan->device.user_data= RT_NULL; wlan->device.type = RT_Device_Class_NetIf; err = rt_device_register(&wlan->device, name, RT_DEVICE_FLAG_RDWR); } static rt_err_t _rt_wlan_dev_control(rt_device_t dev, int cmd, void *args) { struct rt_wlan_device *wlan = (struct rt_wlan_device *)dev; wlan->ops->xxx(...); } ``` # 驱动接口 ```c struct rt_wlan_dev_ops { rt_err_t (*wlan_init)(struct rt_wlan_device *wlan); rt_err_t (*wlan_mode)(struct rt_wlan_device *wlan, rt_wlan_mode_t mode); rt_err_t (*wlan_scan)(struct rt_wlan_device *wlan, struct rt_scan_info *scan_info); rt_err_t (*wlan_join)(struct rt_wlan_device *wlan, struct rt_sta_info *sta_info); rt_err_t (*wlan_softap)(struct rt_wlan_device *wlan, struct rt_ap_info *ap_info); rt_err_t (*wlan_disconnect)(struct rt_wlan_device *wlan); rt_err_t (*wlan_ap_stop)(struct rt_wlan_device *wlan); rt_err_t (*wlan_ap_deauth)(struct rt_wlan_device *wlan, rt_uint8_t mac[]); rt_err_t (*wlan_scan_stop)(struct rt_wlan_device *wlan); int (*wlan_get_rssi)(struct rt_wlan_device *wlan); rt_err_t (*wlan_set_powersave)(struct rt_wlan_device *wlan, int level); int (*wlan_get_powersave)(struct rt_wlan_device *wlan); rt_err_t (*wlan_cfg_promisc)(struct rt_wlan_device *wlan, rt_bool_t start); rt_err_t (*wlan_cfg_filter)(struct rt_wlan_device *wlan, struct rt_wlan_filter *filter); rt_err_t (*wlan_cfg_mgnt_filter)(struct rt_wlan_device *wlan, rt_bool_t start); rt_err_t (*wlan_set_channel)(struct rt_wlan_device *wlan, int channel); int (*wlan_get_channel)(struct rt_wlan_device *wlan); rt_err_t (*wlan_set_country)(struct rt_wlan_device *wlan, rt_country_code_t country_code); rt_country_code_t (*wlan_get_country)(struct rt_wlan_device *wlan); rt_err_t (*wlan_set_mac)(struct rt_wlan_device *wlan, rt_uint8_t mac[]); rt_err_t (*wlan_get_mac)(struct rt_wlan_device *wlan, rt_uint8_t mac[]); int (*wlan_recv)(struct rt_wlan_device *wlan, void *buff, int len); int (*wlan_send)(struct rt_wlan_device *wlan, void *buff, int len); int (*wlan_send_raw_frame)(struct rt_wlan_device *wlan, void *buff, int len); int (*wlan_get_fast_info)(void *data); rt_err_t (*wlan_fast_connect)(void *data,rt_int32_t len); }; ``` 重要的接口： wlan_init: 初始化 wlan_mode: 模式配置 wlan_scan: 扫描 wlan_join: 入网 wlan_get_rssi: 信号强度 wlan_cfg_promisc: 配置混杂模式 wlan_set_channel: 通道设置 wlan_recv: 接受 wlan_send: 发送 ## 数据传输过程 发送： ```c rt_err_t rt_wlan_lwip_protocol_send(rt_device_t device, struct pbuf *p)     rt_err_t rt_wlan_prot_transfer_dev(strct rt_wlan_device *wlan, void *buff, int len)     wlan->ops->wlan_send(wlan, buff, len);     rt_mb_send(&hspi->spi_tx_mb, (rt_ubase_t)data_packet); ``` 接受： ```c void wifi_data_process_thread_entry(void *parameter)     rt_wlan_dev_report_data(wifi_sta.wlan, (void *)data_packet->buffer, data_packet->data_len);         rt_wlan_dev_transfer_prot(device, buff, len);             prot->ops->prot_recv(wlan, buff, len);                 rt_err_t rt_wlan_lwip_protocol_recv(struct rt_wlan_device *wlan, void *buff, int len)                     pbuf_take(p, buff, len);                     eth_dev->netif->input(p, eth_dev->netif) ``` # 测试 ``` msh />wifi scan SSID MAC security rssi chn Mbps ------------------------------- ------------------------------- ---- --- ---- PC08 c8:3b:35:35:db:b1WPA2_AES_PSK -65 3 4294 TP-LINK_0A4E 80:89:17:0a:0a:4eWPA2_AES_PSK -64 6 4294 CU_3cm6 40:67:9b:3c:40:76WPA2_MIXED_PSK -66 1 4294 杞杞昏昏垷垷~ cc:2d:21:c1:a3:21WPA2_AES_PSK -73 2 4294 midea_db_0439 10:2c:8d:3a:be:81OPEN -76 1 4294 CMCC-GUIDE-LINK 68:a7:b4:f5:7a:41WPA2_AES_PSK -79 11 4294 _82 40:b0:76:c3:fc:b8WPA2_AES_PSK -79 12 4294 Ming dc:91:66:1a:61:34WPA2_AES_PSK -80 11 4294 CMCC-2MYH 68:a7:b4:f5:7a:40WPA2_AES_PSK -84 11 4294 msh />wifi join PC08 abcxxxyyy [I/WLAN.mgnt] wifi connect success ssid:PC08 [I/WLAN.lwip] Got IP address : 192.168.1.15 msh />ifconfig network interface device: e0 (Default) MTU: 1500 MAC: 00 11 22 33 44 55 FLAGS: UP LINK_DOWN INTERNET_DOWN DHCP_ENABLE ETHARP BROADCAST IGMP ip address: 0.0.0.0 gw address: 0.0.0.0 net mask: 0.0.0.0 dns server #0: 192.168.1.1 dns server #1: 0.0.0.0 network interface device: w0 MTU: 1500 MAC: fc 68 4a a8 f4 36 FLAGS: UP LINK_UP INTERNET_DOWN DHCP_ENABLE ETHARP BROADCAST IGMP ip address: 192.168.1.15 gw address: 192.168.1.1 net mask: 255.255.255.0 dns server #0: 192.168.1.1 dns server #1: 0.0.0.0 network interface device: w1 MTU: 1500 MAC: fc 68 4a a8 f4 37 FLAGS: UP LINK_DOWN INTERNET_DOWN DHCP_ENABLE ETHARP BROADCAST IGMP ip address: 0.0.0.0 gw address: 0.0.0.0 net mask: 0.0.0.0 dns server #0: 192.168.1.1 dns server #1: 0.0.0.0 ```

Jacktang

有关RT-Thread设备驱动开发步骤介绍的很清楚了

ccduan

您的讲解为了解开了我的困惑，终于可以继续搞下去了，万里长征第一步已经迈开！谢谢！

jyb271126848

解开了我的困惑 RT-Thread设备驱动开发的第一步已经迈开  很清楚了