--- title: "using Barkley API, missing recv packets?" url: "https://maker.wiznet.io/forum/13268" markdown_url: "https://maker.wiznet.io/forum/13268/md" type: "Forum topic" category: "Ethernet Chips" author: "johanan" created: "2019-04-07T12:16:39+09:00" last_activity: "2020-03-01T12:01:31+09:00" language: "en" views: 1173 replies: 12 source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)" --- # using Barkley API, missing recv packets? ## Question Asked by johanan on 2019-04-07 in Ethernet Chips. I am trying to use W5100S with Barkley API, which seems to start working OK, connection is established, and data transfer begins. However after a short time my device (server) waits for a response from client, but it looks like client already sent it, but the W5100S missed it. How can I check it? I also fine cases that I call recv(sn, buf,len), but it reads more then len bytes from the chip RX buffer (looks like it reads all pending bytes). This is incorrect behavior, I wonder if it should be like so (it should retrive only len bytes, even if the buffer has more) Thanks Johanan ## Replies ### Reply 1 by irina, 2019-04-09 Hi~ johanan Could you check the socket buf size about opened socket? Please attach the wireshark capture file(*.pcap) and I think I can solve the problem more quickly. thanks BR irina ### Reply 2 by johanan, 2019-04-10 (in reply to reply 1) Hello Irina, I didn’t make any initialization to socket buffer size as I assume it is the default 2K after reset. I never send or recv buffer larger then 1K, so I think this is not the issue. I will do wireshark capture and send you on separate mail. Thanks and regards, Johanan ### Reply 3 by irina, 2019-04-11 johanan: > I will do wireshark capture and send you on separate mail. > Thanks and regards, > Johanan Hi~ Johanan Did you send me an email with the package capture file attached? I don’t receive your email. thanks, BR irina ### Reply 4 by johanan, 2019-04-12 Hi Irina, Thanks for the followup, but I had an urgent bug in another project and didn’t make it. Will do it on Monday. Best regards Johanan. > ![](https://maker.wiznet.io/forum_uploads/wiznet/original/2X/5/5bbf5cfafeae09d1c61c71e2f9867ec438d47621.jpeg) > [irina_kim](https://forum.wiznet.io/u/irina_kim) > > ``` WIZnet Team April 11 ``` > > > ![](https://maker.wiznet.io/forum_uploads/wiznet/original/2X/d/d19ca25508ad4bec05e2cc1b0e24cd6ad7a23d71.png) johanan: > > I will do wireshark capture and send you on separate mail. > > > > Thanks and regards, > > > > Johanan > Hi~ Johanan > Did you send me an email with the package capture file attached? > > I don’t receive your email. > thanks, > > BR > > irina > --- > > [Visit Topic](https://forum.wiznet.io/t/topic/5698/4) or reply to this email to respond. > --- > > #### In Reply To > > ![](https://maker.wiznet.io/forum_uploads/wiznet/original/2X/e/e9df7b804cc2cccd789679d76cae9b7c4afb9275.png) > [johanan](https://forum.wiznet.io/u/johanan) > > ``` April 10 ``` > > Hello Irina, I didn’t make any initialization to socket buffer size as I assume it is the default 2K after reset. I never send or recv buffer larger then 1K, so I think this is not the issue. I will do wireshark capture and send you on separate mail. Thanks and regards, Johanan > --- > > [Visit Topic](https://forum.wiznet.io/t/topic/5698/4) or reply to this email to respond. > To unsubscribe from these emails, [click here](https://forum.wiznet.io/email/unsubscribe/375f206f8c96f695e69c278e57319f1899b59f98e873a248bfce18ef6fd44396). missing recv packets? CC: ### Reply 5 by johanan, 2019-04-14 Hello Irina, Well I used Wireshark, found my problem. (It was enough to suggest using it, ![:slight_smile:](https://emoji.discourse-cdn.com/twitter/slight_smile.png?v=12) ) All working now. Thanks. Johanan ### Reply 6 by johanan, 2019-04-14 Hi Irina, Now I have my system is working quite well, I would like to speed it up by using SPI DMA (using the Barkley API). I found this document in Korean, do you have in English? (I couldn’t find). Thanks, Johanan ### Reply 7 by irina, 2019-04-15 Hi~ Johanan Currently, I didn’t write the document in English version yet. I think you can’t need to see the document of English version when DMA mode use. If you need to see the document of English version, I will send email you after write the document as soon as possible. thanks, irina ### Reply 8 by irina, 2019-04-16 Hi~ Johana I uploaded the W5100S DMA document in English version. You can download it by clicking the link below. Download link : [W5100S DMA Datasheet(En)](https://wizwiki.net/wiki/lib/exe/fetch.php?media=products:w5100s:w5100s_an_dma_v100e.pdf) thanks, BR irina ### Reply 9 by johanan, 2019-04-18 Thank you very much. I have one question about optimal 25 MHz crystal for W6100 (we are making a pcb for it), can you advice suitable crystal part number? Regards Johanan ### Reply 10 by irina, 2019-04-18 Hi~ johanan You have to use 25MHz crystal when you make the pcb using the W6100. We have used the crystal part(82J0626-25.000MHz) and Tech.Characteristic is X-tal 25MHz,3.2x2.5 SMD, CL=27pF,Industrial,ITTI . For detailed information, you visit the web site : [W6100 EVB Schematic](https://github.com/Wiznet/Hardware-Files-of-WIZnet/tree/master/02_iEthernet/W6100) thanks, BR irina ### Reply 11 by johanan, 2019-04-21 Hi, as we are preparing to make our own PCB with your module, I am confused which module is best for us, and which one is the most updated. Please let me know difference between W5100S, W5500, and W6100. I need to make sure that I select right chip for me which means: 1. Stable user library. 2. Availability (in stock) 3. Price. Please let me know what is the recommended chip for new design. Best Regards Johanan ### Reply 12 by Mario Runje, 2020-03-01 Hi irina_kim Can you post link where to find those crystals? I’ve been through all webshops with crystals and couldnt find any that’s as near as those specifications --- Source: https://maker.wiznet.io/forum/13268