topic lpc1788+lan8720 Ethernet FCS calculation in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/lpc1788-lan8720-Ethernet-FCS-calculation/m-p/519458#M3171 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by padmaja on Thu Feb 25 02:11:57 MST 2016</STRONG><BR /><SPAN>hi,</SPAN><BR /><SPAN>i am using uezgui-1788-70wvm module.</SPAN><BR /><BR /><SPAN>1.in this i want to calculate FCS, i was used simple c program provide in UM10470 user maual. But if i generate FCS using this function,wireshark shows wrong checksum. i was tried with different crc-32 formats, wire shark shows all are wrong. Let me know, if is there any specific protocol is there for FCS calculation??</SPAN><BR /><BR /><SPAN>2. if i reply to ARP request from other module i just send 42 bytes arp reply message, but it is not appear at wireshark at the same time its not reached to host. i was tried to send 60bytes msg also then also same behaviour. If i send ARP reply to my pc, at this time ethernet frame (arp reply ) is appear in wireshark. Is there any specific reason for this behaviour? or i was missing something in firmware of lpc1788??</SPAN><BR /><BR /><SPAN>thanks &amp; regards,</SPAN><BR /><SPAN>padmaja.</SPAN></BODY></HTML> Wed, 15 Jun 2016 17:38:14 GMT lpcware 2016-06-15T17:38:14Z lpc1788+lan8720 Ethernet FCS calculation https://community.nxp.com/t5/LPC-Microcontrollers/lpc1788-lan8720-Ethernet-FCS-calculation/m-p/519458#M3171 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by padmaja on Thu Feb 25 02:11:57 MST 2016</STRONG><BR /><SPAN>hi,</SPAN><BR /><SPAN>i am using uezgui-1788-70wvm module.</SPAN><BR /><BR /><SPAN>1.in this i want to calculate FCS, i was used simple c program provide in UM10470 user maual. But if i generate FCS using this function,wireshark shows wrong checksum. i was tried with different crc-32 formats, wire shark shows all are wrong. Let me know, if is there any specific protocol is there for FCS calculation??</SPAN><BR /><BR /><SPAN>2. if i reply to ARP request from other module i just send 42 bytes arp reply message, but it is not appear at wireshark at the same time its not reached to host. i was tried to send 60bytes msg also then also same behaviour. If i send ARP reply to my pc, at this time ethernet frame (arp reply ) is appear in wireshark. Is there any specific reason for this behaviour? or i was missing something in firmware of lpc1788??</SPAN><BR /><BR /><SPAN>thanks &amp; regards,</SPAN><BR /><SPAN>padmaja.</SPAN></BODY></HTML> Wed, 15 Jun 2016 17:38:14 GMT https://community.nxp.com/t5/LPC-Microcontrollers/lpc1788-lan8720-Ethernet-FCS-calculation/m-p/519458#M3171 lpcware 2016-06-15T17:38:14Z