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FreeRTOS Support ArchiveThe FreeRTOS support forum is used to obtain active support directly from Real Time Engineers Ltd. In return for using our top quality software and services for free, we request you play fair and do your bit to help others too! Sign up to receive notifications of new support topics then help where you can.
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Potential gotcha in RX600_RX62N-RSK_RenesasPosted by Steven J. Ackerman on January 17, 2013 If you enable UDP support, and then add a UDP app that generates a packet via a call uip_udp_periodic() such as dhcp or ntp there is a potential problem - uip_buf is initialized to NULL at the end of vInitEmac(). When the packet is generated uip_buf is not pointing to an ethernet buffer so whatever is in your memory starting at address 0 will be trashed. In my application this turned out to be the ethernet descriptor tables. My fix was to set uip_buf to a valid ethernet buffer instead of NULL by a call to prvGetNextBuffer(). I hope that this saves somebody some time tracking this down. Steven J. Ackerman, Consultant ACS, Sarasota, Florida http://www.acscontrol.com RE: Potential gotcha in RX600_RX62N-RSK_RenesasPosted by Richard on January 17, 2013 Thanks for pointing this out. I think that example acts as a server, so uip_buf is assigned when a packet comes in, rather than when a transmission is initiated by the stack. If you are only using UDP then you might consider the new FreeRTOS UDP/IP stack, if it meets your needs: http://www.FreeRTOS.org/udp Regards.
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NXP tweet showing LPC5500 (ARMv8-M Cortex-M33) running FreeRTOS.
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