Sample Multiasking source code for 16F877A

[A.Palaniappen]

hye everyone,
i'm doing final year project "Automatic Plant watering systems"
i need sample multiasking source code for 16F877A.
multiasking program to control watering pump and water level control and at the same time cut off watering pumps signal when day is raining.
i'm using two type of sensor
=>detect water level in tank.
=> Humidity sensor.
while(1)
{
if
{
timer to contorl watering pump to on
}

else if
{
contol water level
}

else if
{
cut off watering pump signal
}
}
program like this i think is not suit to control my fyp.
any comment/help

[zhenning]

hye everyone,
i'm doing final year project "Automatic Plant watering systems"
i need sample multiasking source code for 16F877A.
multiasking program to control watering pump and water level control and at the same time cut off watering pumps signal when day is raining.
i'm using two type of sensor
=>detect water level in tank.
=> Humidity sensor.
while(1)
{
if
{
timer to contorl watering pump to on
}

else if
{
contol water level
}

else if
{
cut off watering pump signal
}
}
program like this i think is not suit to control my fyp.
any comment/help

You can try Real Time Operating System : RTOS : FreeRTOS or micrium. Scheduling is also one of the multitasking method.

[zhenning]

You can also try Salvo RTOS. there is an example of using it from microchip:

http://ww1.microchip.com/downloads/en/A ... 00777b.pdf

[A.Palaniappen]

Thank's for your reply.

[Brian Griffin]

The BoostC Professional contains small RTOS too. You can try it actually.

[robosang]

That do not require a RTOS I think. Just a simple task. And the RTOS is not really multi-tasking, just distributing every task into smaller section and doing it in sequence so that you see them as multi-tasking.

[A.Palaniappen]

haixx....i try ready..the rtos source code that you attach to me...is not working..

[yonghui]

ya i agree with robosang that is task do not need any RTOS. i guess water level or humidity wont increase so fast until faster your while loop time in PIC16F877. and this case to use RTOS is only wasting the tasks switching overhead. RTOS divide task into small piece of running time and switch between it and at the same time consider the priority of each task, that is wat RTOS do.

[A.Palaniappen]

so....how to overcome with my problem....

[Brian Griffin]

Can you use a timer to work on this first? There are examples like that in the net. One of them is a "pseudo-multitasking" which doesn't need RTOS.