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I have some questions about ucos .. I have a little problems ..
I have Ucos book & source version 2.52 and arm port for ver 2.61 .. strange but can't download anywhere source 2.61 so .. works ..
but works with problems .. maybe the problem is b/c source is not
version 2.61 .. the problem is:
- two tasks: first blinks with the led, the second waits on semaphore if the new uart caracter came.
- two interupts: Tx witch handles tx circular buffer ..
- Rx which receives input char put it in in circ. buff. and post count semaphore ... the task which waits on sempahore pend that semaphore pick up the income char and put to the out tx buffer.
When i typing char's by hand everything is ok .. i give echo everything I typed, BUT when I send a big asci file the echo task
sometimes die , not evertimes but it can hapens... WHY ? can
any1 with arguments tell me why ?
Hi there. I am using uCOS2.76 too but for the Motorola 56F8357 CPU.
But we have similair problems:
- A simple UART rec/send task which waits for semaphores
for reading char and then sends char back to uart.
- UART chars are delivered via interrupt and OSSemPost().
The app crashes or behaves undeterminstic after some chars are echoed.
I suspect the task switching function OSCtxSw of our port does not save
all registers, maybe that is the case with you too?
Put OS_ENTER_CRITICAL() before
and OS_EXIT_CRITICAL() after ring buffer access .
Regarding "I suspect the task switching function OSCtxSw of our port does not save
all registers, maybe that is the case with you too? "
- UCOS ports are compiler specific as there is no ABI defined for mciros - most of compiler design used different registers for different purposes (param passing , temp registers ... ). But you can check the asm part of port where context switch is performed to ensure that all registers are saved into tasks stack before context switch is actually done .
Put watchdog or watchdog task into micro (with highest prio) which is activated on specific event
(button press) . It must do - check the button and wait 0.5 secs . When you feel that echo task has locked , press button and this task must send entire locked tasks stack to remote PC let say via same UART .
In addition you can define debug memory where your taks and ISR will put debug info in your mcu and watchdiog task will send information there as well .
You can check let say stack overusage by filling 0x55 to entire stack and see up to what extend stack has been used .
Hi Everyone,
I tried to find the free UCOS software from http://www.hjhj.com/ website, as someone here pointed out, but I was unable to find it. Would you please help?
Regards,
Thomas
how many RAM and flash it takes on AVR atmega platform? How many cycles it takes for task switching? Please give some statistical tables on ucos and compare it to other like as freeRTOS.
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