Thank you very much for your reply.
Yes the external interrupts are working and i also have 3 LED’S for each button to show interrupts.
Yes i can explain the problem with a code.
i have 3 tasks
let’s say 1,2 and 3
if interrupt from button 1 or 2(which will turn ON or OFF 1st and 2nd LED) come then
all three tasks are suspended.
else if interrupt on 3rd button(which will turn on 3rd LED) arrive then it will resume all the tasks.
SO when all 3 LED’s are ON then tasks are resume.
what i observe is if all 3 LED’s are ON then everything is working properly, i checked with printf but if i switch off 3rd LED(or all) then tasks are suspended, but after 2 or 3 minutes if i resume all tasks then the printf comes very fast from each tasks and then printf slow down(according to given delay). sometimes task continue to run but most of the time it failed.
i thinks when task are suspended printf continue to execute and when i resume the task then printf will show on console speedily.
i’m using semaphore mutex for each task and VTaskDelay for the task delay.
xTaskCreate(Task1, "Task1",1024, &_fsm, 5, NULL);
xTaskCreate(Task2, "Task2", 300, &_device, 4,NULL);
xTaskCreate(Task3, "Task3", 512, &_fsm, 3, NULL);
if ( bit_state==0x00)
else if (bit_state==0x01)
The same code for interrupt 2 and 4 with LED 2 and 3
and on end just write the gpio out
void Task1(fsm _fsm)
if( gatekeeper != NULL )
if (bit_state==0x1 || bit_state==0x2)
printf("task 1 is doing nothing \n");
printf("task 1 is failed \n");
The other two tasks(Task2 and Task3) have the same logic but they will wait for semaphore 6msec
and both have
For three tasks the delay is right with respect to synchronization…?
because the 1st task will with for 12msec to wait for semaphore and delay 6msec to avoid to call the task1 again and Task2, and Task3 accept the semaphore in 6 msec and after 12msec the Task1 execute again…?
as i have already said if i switch off 3rd button and after 3 minutes i resume all tasks then the printf comes very fast more than the sampling time and Task2 and 3 failed because Task1 is already failed and both are not taking semaphore on a predefined time.
I’m using UDP Stack for Ethernet communication.
I came to know after 3 or 4 minuts i received this info:
Info: No packet was received until timeout.
with respect to the Error Number
pdFREERTOS_ERRNO_EWOULDBLOCK which mean
“If no bytes are received before the configured block time expires then -pdFREERTOS_ERRNO_EWOULDBLOCK is returned.”
This is my Task1 and if this task failed it will wait for timeout to receive and until then the other Task2 and Task 3 are also failed because of not getting semaphore and they will show again printf with a Task1 timeout INFO.
How we can solve this problem, i tried to by changing the receive time but it’s giving the same error.
Thank you very much.