ESP32 Forum

Posted: **Sun Mar 21, 2021 3:28 am**

Hello,espressif.
here I meet some problem while using WIFI CSI.
here is my idf version:idf-v4.0.2

I run one task in my code:ping_task which send ping message to the ap per second,thus the esp32 will get csi infomation.

this is the main code:

Code: Select all

void app_main()
{
    nvs_init();
    station_init();
    csi_event = xEventGroupCreate();
    csi_init("STA");
    xEventGroupSetBits(csi_event, DATA_PC_TX);
    xEventGroupWaitBits(s_wifi_event_group, WIFI_CONNECTED_BIT, pdFAIL, pdFAIL, portMAX_DELAY);
    xTaskCreate(ping_task, "ping", 4096, NULL, 5, NULL);
}

and the wifi_csi_init code:

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void csi_init(char *type)
{
    project_type = type;
    ESP_ERROR_CHECK(esp_wifi_set_csi(true));

    wifi_csi_config_t configuration_csi;
    configuration_csi.lltf_en = 1;
    configuration_csi.htltf_en = 1;
    configuration_csi.stbc_htltf2_en = 1;
    configuration_csi.ltf_merge_en = 1;
    configuration_csi.channel_filter_en = 0;
    configuration_csi.manu_scale = 0;

    ESP_ERROR_CHECK(esp_wifi_set_csi_config(&configuration_csi));
    ESP_ERROR_CHECK(esp_wifi_set_csi_rx_cb(&_wifi_csi_cb, NULL));
}

csi callback function.the callback function print the amplitude and phase data when csi data are recieved.

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void _wifi_csi_cb(void *ctx, wifi_csi_info_t *data)
{
	int8_t *my_ptr = data->buf;
	int i = 0;
    int bit = xEventGroupGetBits(csi_event);


    if (bit & DATA_PC_TX)
    {
        int i = 0;
        
        for ( i = 0; i < 64; i++)
        {
            
            outprintf("%.4f,", sqrt(pow(my_ptr[i * 2], 2) + pow(my_ptr[(i * 2) + 1], 2)));
        }
        for (i = 0; i < 63;i++)
        {
            outprintf("%.4f,", atan2(my_ptr[i*2], my_ptr[(i*2)+1]));
        }
        outprintf("%.4f\n", atan2(my_ptr[i*2], my_ptr[(i*2)+1]));

    
    }
}

finally,the ping task code is below:the task will send ping message to gateway every second inorder to get csi infomation

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static void ping_task(void *arg)
{
    uint32_t timeout = 1000;
    uint32_t total_count = 100;
    uint32_t current_count = 0;
    in_addr_t gw_ip = inet_addr("192.168.3.4"); //ping网关

    int s, ret;

    LWIP_UNUSED_ARG(arg);

    //创建ipv4，原生协议接口，使用ICMP协议
    if ((s = socket(AF_INET, SOCK_RAW, IP_PROTO_ICMP)) < 0)
    {
        printf("create socket fail\n");
    }
    ret = setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
    if (ret == 0)
    {
        printf("set socket timeout success\n");
    }

    int tos = 1;
    tos <<= 5;
    ret = setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(tos));
    if (ret == 0)
    {
        printf("set socket tos success\n");
    }

    while (1)
    {
        if (current_count++ >= total_count)
        {
            ping_flag = false;
        }
        if(ping_flag)
        {
            if (ping_send(s, gw_ip) == ERR_OK)
            {
                //printf("ping send ok \n");

                //gettimeofday(&ping_time, NULL);
                //ping_recv(s);
            }
            else
            {
                printf("ping send fail \n");
            }
        }

        vTaskDelay(1000 / portTICK_RATE_MS);
    }
}

I don't known why this ''W (30761) wifi:unknown csi bug!'' are printed.Can anyone help me with the problem?
Tanks for your reading!