Re: [lwip-users] lwIP hangs after some data transferred

[Noam weissman]

Hi,

Please check if you free memory properly. It sounds like a memory leak?

BR,
Noam.


-----Original Message-----
From: address@hidden on behalf of Grzegorz Niemirowski
Sent: Tue 9/2/2014 8:34 PM
To: Mailing list for lwIP users
Subject: Re: [lwip-users] lwIP hangs after some data transferred
 
Thanks Noam. I have interrupt priorities set exactly as you have written. 
The problem must be somewhere else.

Best regards,
Grzegorz Niemirowski

Noam weissman <address@hidden> napisal(a):
> Hi,
> You must check interrupt priorities and your FreeRTOSConfig definition
> file
> Here is my interrupt settings from the FreeRTOSConfig .h file:
> ------------------------------------------------------------------------
> ----------------------------------------------------
> /* Cortex-M specific definitions. */
> #ifdef __NVIC_PRIO_BITS
> /* __BVIC_PRIO_BITS will be specified when CMSIS is being used.
> */
> #define configPRIO_BITS       __NVIC_PRIO_BITS
> #else
> #define configPRIO_BITS       4        /* 15 priority
> levels */
> #endif
> /* The lowest interrupt priority that can be used in a call to a "set
> priority"
> function. */
> #define configLIBRARY_LOWEST_INTERRUPT_PRIORITY 0xF
> /* The highest interrupt priority that can be used by any interrupt
> service
> routine that makes calls to interrupt safe FreeRTOS API functions.  DO
> NOT CALL
> INTERRUPT SAFE FREERTOS API FUNCTIONS FROM ANY INTERRUPT THAT HAS A
> HIGHER
> PRIORITY THAN THIS! (higher priorities are lower numeric values. */
> #define configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY 5
> /* Interrupt priorities used by the kernel port layer itself.  These are
> generic
> to all Cortex-M ports, and do not rely on any particular library
> functions. */
> #define configKERNEL_INTERRUPT_PRIORITY (
> configLIBRARY_LOWEST_INTERRUPT_PRIORITY << (8 - configPRIO_BITS) )
> /* !!!! configMAX_SYSCALL_INTERRUPT_PRIORITY must not be set to zero
> !!!!
> See http://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html. */
> #define configMAX_SYSCALL_INTERRUPT_PRIORITY (
> configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY << (8 - configPRIO_BITS) )
> #define ETH_ISR_PRIO           10
> #define SERIAL_ISR_PRIO        6
> ------------------------------------------------------------------------
> ----------------------------------------------------
> As you can see in the above file
> configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY  is 5 as ETH_ISR_PRIO is 10
> Set your ETH interrupt as follows:
>  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);
>  /* Configures and enable the Ethernet global interrupt. */
>  NVIC_InitStructure.NVIC_IRQChannel = ETH_IRQn;
>  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = ETH_ISR_PRIO;
>  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
>  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
>  NVIC_Init(&NVIC_InitStructure);
> FreeRTOS function uses critical section protection that actually blocks
> interrupts
> Any ISR code that uses FreeRTOS functions MUST have a lower interrupt
> priority. If you do not follow this
> The critical section protection will not work and therefore you get
> unpredictable or un stable system.
> I also suggest reading the FreeRTOS section on interrupts:
>    http://www.freertos.org/a00110.html
>    http://www.freertos.org/RTOS-Cortex-M3-M4.html
> Hope that helped,
> Noam.
> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden On Behalf Of
> Grzegorz Niemirowski
> Sent: Tuesday, September 02, 2014 12:09 AM
> To: address@hidden
> Subject: [lwip-users] lwIP hangs after some data transferred
> Hello,
> I write code for SMT32 board using FreeRTOS and lwIP 1.4.1. I use
> sockets.
> There is a simple TCP server: it accepts incoming connection, reads 100
> bytes sent from PC, sends 100 byte reply, closes connection and waits
> for another connection. I observed that after some time lwIP stops
> ACKing packets fast enough and eventually it hangs. It no longer
> responds to SYN or ICMP ping. Here are two examples of such
> communication. Both files contain whole communication between PC and my
> device after device reset. For testing purposes there were four
> applications running at the same time so the problem could be observed
> withing shorter time.
> http://www.grzegorz.net/test1a.pcapng
> http://www.grzegorz.net/test2a.pcapng
> Is it a problem with lwIP, low level IF driver or FreeRTOS?
> Best regards,
> Grzegorz Niemirowski 


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