Re: [lwip-users] Stuck in netconn_write()

[Thomas Johansen]

Hi,

Yes, I use configUSE_PREEMPTION 1

There is no vTaskDelay() in my Idle task, but the __wfi instruction. Schould 
wait for the next tick interrupt

Thomas

From: address@hidden [mailto:address@hidden On Behalf Of Nikolas Karakotas
Sent: 16. januar 2013 00:09
To: Mailing list for lwIP users
Subject: Re: [lwip-users] Stuck in netconn_write()

Hi,

Have you set this flag:
configUSE_PREEMPTION 1

Also in your Idle tasks do you call vTaskDelay?

Regards,
Nick

From: Thomas Johansen
Sent: Tuesday, January 15, 2013 10:55 PM
To: address@hidden
Subject: [lwip-users] Stuck in netconn_write()

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


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