Hi all I have a LPC1788 running FreeRTOS and lwIP.
When a task, using netconn_write function, has a to low FreeRTOS priority, then it can lockup sometimes. I have a function I use for sending Ethernet data via the netconn API. To protect the TX function I use a critical section so one task can complete the transmit before a new one can do it. But if I the calling task has a low FreeRTOS priority the task is stuck in the netconn_write(..) function?? It seems strange to me. It never returns from it. Using higher priority, seems to solve the issue. If the calling tasks has priority of at least 3, it seems to be fine. (I haven't tried higher) The lwip recevie, transmit and tcp_ip task has the FreeRTOS priority at 3,3 and 4 The NVIC priority are set accordingly to Cortex M3 and FreeRTOS guideline. (Higer is lower:-)) Any idea why it does that? Thomas ________________________________ ______________________ Appended by AGRAMKOW Fluid Systems A/S _______________________ This e-mail and any attachments may contain information which is confidential, proprietary, privileged or otherwise protected by law. The information is solely intended for the named addressee (or a person responsible for delivering it to the addressee). If you are not the intended recipient of this message, you are not authorized to read, print, retain, copy or disseminate this message or any part of it. If you have received this e-mail in error, please notify the sender Immediately by return e-mail and delete it from your computer. **************************************************************************** This e-mail has been scanned by http://www.comendo.com and does not contain virus. ****************************************************************************
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