Problem with lwevents on MQXlite

wojciechlesniew — Sat, 09 Jan 2016 15:50:18 GMT

Hi everyone!

I have a problem with MQXlite lightweight events on KL25z. The algorytm looks like this:

1) Main task creates two additional tasks, initializes events and mutexes, after all- blocks itself

(...)

if(_lwevent_create(&lwevent,0) != MQX_OK){

uart_string("Event create failed\r\n");

_task_block();

}else{

uart_string("Event create OK!\r\n");

}

_mutex_init(&my_mutex, NULL);

_task_block();

_mqx_exit(0);

2) Task1 checks for pressed button and while it's pressed sets event connected to Task2 then unlocks mutex- "if" condition below is in while tasks' loop

if(Button)

{

result = _lwevent_set(&lwevent,K_EVENT);

if(result != MQX_OK)

{

uart_string("Event setting failed\r\n");

_task_block();

}

else

{

counter++;

LedR_ClrVal(0);

}

_mutex_unlock(&my_mutex);

}

else

{

LedR_SetVal(0);

}

3) Task2 shall do something and wait for next button press

while(1) {

counter++;

result_event = _lwevent_wait_ticks(&lwevent,K_EVENT,TRUE,0);

if(result != MQX_OK){

sprintf(uart_buf3, "Czekanie na event nie wyszlo, kod bledu 0x%X", result);

uart_string(uart_buf3);

_task_block();

}

_mutex_try_lock(&my_mutex);

do_sth();

_lwevent_clear(&lwevent,K_EVENT);

_mutex_unlock(&my_mutex);

if(_lwevent_clear(&lwevent,K_EVENT) != MQX_OK){

uart_string("Event clear failed!\r\n");

_task_block();

}

Such code structure I took from lwevent tutorial written when CW6.3 was availble but I cannot find it now. What am I doing wrong?

Re: Problem with lwevents on MQXlite

soledad — Mon, 11 Jan 2016 22:14:10 GMT

Hello,

For CodeWarrior 10.6, you can find and example at the path: C:\Freescale\CW MCU v10.6\MCU\CodeWarrior_Examples\Processor_Expert\MQXLite\Kinetis\FRDM_KL25Z\LWEVENT_KL25Z\Sources

Please check the attached example code

Have a great day,
Sol

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topic Re: Problem with lwevents on MQXlite in MQX Software Solutions

Problem with lwevents on MQXlite

Re: Problem with lwevents on MQXlite