Hi,
I am not familiar with atxmega128a3u so I hope my input here will help and not
confuse you.
I never had problems with UARTS but I did have problems with LwIP when
interrupts priorities were
not defined properly versus the FreeRTOS interrupt.
1.
Check that your interrupts are configured properly meaning the TCP stack cannot
have a priority
higher than the FreeRTOS !!
The following are my settings, these are for STM32F4xx a an M-Cortex micro
Check the following (if this applicable for your cpu):
/* 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 (configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY +
5)
#define IR_TIMERS_ISR_PRIO (configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY +
2)
#define SERIAL_ISR_PRIO (configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY +
1)
2.
I have seen that your micro is 8 bit and has just 8KB of RAM ?... how much is
for the OS and how much for LwIP ???
----------------------------------------------------------------------------------------------
I was able to run only FreeRTOS on a micro with just 10K ... how do you ran the
OS and LwIP
With only 8K ???
BR,
Noam.
From: [email protected]
[mailto:[email protected]] On Behalf Of unnamed
Sent: Tuesday, July 28, 2015 12:11 PM
To: [email protected]
Subject: Re: [lwip-users] freertos + lwip = no uart ?
about memory - i need more time to check that, .map file is confusing for me
right now and i don't know how to check it and be 100% sure i'am right :) must
read some tutorials first :)
for uart i tested like 3 approaches found on internet
1 interrupt based is from here
https://code.google.com/r/etiennebesancon-freertos-on-xmega/source/browse/Framework/drivers/usart_driver_RTOS.h?name=stdout_task_dev&r=4136176e4954a2af400fe042719c0fe5f65883f2
2 no interrupts, function names like in above examples, pretty unique i think
usartBufferPutString(), PrintChar(), nothing like send()
3 right now i'am using printf() for every uart message (prinf linked to
function PrintChar) no interrupts, so there are basicly 3 function
UsartBuffer * usartBufferInitialize(USART_t * usart, Baudrate_enum baudrate
,char bufferSize)
static int PrintChar(char c, FILE *stream)
int uart_getchar(FILE *stream)
tested on 9600 and 115200 baud rate
lwip_debug is disabled in lwipopts.h
"?" is showing upon initializing function
without lwip files in makefile every approach works fine
2015-07-28 10:21 GMT+02:00 Grzegorz Niemirowski [via lwIP] <[hidden email]>:
Damian, could you provide a piece of code you use for accessing UART? Do you
use functions named like send()? Maybe you have LWIP_COMPAT_SOCKETS defined and
functions redefined?
#define send(a,b,c,d)Â Â Â Â Â Â Â Â lwip_send(a,b,c,d)
Best regards,
Grzegorz Niemirowski
On Tue, Jul 28, 2015 at 10:06 AM, Damian Martyniuk <[hidden email]
<http://user/SendEmail.jtp?type=node&node=24732&i=0> > wrote:
hi, hmm i don't see any messages about memory exceeding the resources available
or something like "memory could not be "Written"" - but i never looked at map
file so i could be wrong (following this
http://www.codeproject.com/Articles/3472/Finding-crash-information-using-the-MAP-file)
- what should i be searching for ?
nothing seems wrong for my level of knowledge.
for me it's wierd that only uart is not working, freertos tasks are fine,
application is working - the only thing is that i don't get messages to my
terminal.
maybe i should buy external crystal ? i'am working on 32Mhz internal xmega
clock right now.
2015-07-28 9:18 GMT+02:00 Adam Fullerton <[hidden email]
<http://user/SendEmail.jtp?type=node&node=24732&i=1> >:
Hi,
Have you had a look at the linker map file? My guess is that the
additional memory requirements has exceeded the resources available.
Cheers,
Adam.
On 27/07/2015 07:33, unnamed wrote:
hi, i'am trying to port FreeRTOS + lwip to atxmega128a3u and
almost every
thing is working fine, only my uart wont fire up when i compile
my project
with lwip files included, what can be the cause of this ? Any
help would be
appreciated.
without lwip files uart is working great
with lwip files i just get one character "?" upon uart init
function and
nothing else, tasks are still working fine.
tried uart with and without interrupts
lwip is not initialized in my project, only compiled
i'am using
microchip: atxmega128a3u on internal 32mhz clock
freeRTOS 8.2
lwip 1.4.1
any help where should i search for erros ? right now i can't
use my debugger
becouse there is something wrong with amtel-ice+osx+avrdude so
i'am stuck...
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