topic problem occurs when i integrated my code with Coldfire_Lite project in ColdFire/68K Microcontrollers and Processors

problem occurs when i integrated my code with Coldfire_Lite project

paddy — Tue, 02 Dec 2008 22:09:50 GMT

Hi,

i am using mcf52235EVB board and keeping the Coldfire_Lite V30.0 as base and i tried to intergrate my code. i need to use TCP communcation with other system and i need to communicate with LCD using UART.

By keeping Coldfire_Lite_TCP_server as target i created a task to handle the LCD module. in the task entry i am initialized the UART2 and in the infinet loop calling the LCD function.

After executing the first command the control goes the uart2_isr() routine and not executing the other function if control goes to the next function also it not displaying in LCD.

when i implemanted separately in the new project it's working fine. only interrupt is genterated when soft buuton is pressed in LCD.

Does any setting show be done for Coldfire_Lite project.

could you please help me.

Regards,

Re: problem occurs when i integrated my code with Coldfire_Lite project

RichTestardi — Wed, 03 Dec 2008 05:50:25 GMT

In your new task's infinite loop, are you remembering to call tk_yield(), or some other similar function?

-- Rich

Re: problem occurs when i integrated my code with Coldfire_Lite project

paddy — Wed, 03 Dec 2008 13:32:18 GMT

Hi Rich,

I am calling tk_yield() in the infinte loop. i have tried without using tk_yield() function also, but it show the same problem not displaying any button in the LCD but it clearing the screen.

when i debug step by step it's working fine, it is displaying the button in the LCD.But when i run the program it only clearing the screen.

Thanks & Regards,

Re: problem occurs when i integrated my code with Coldfire_Lite project

tkvenki — Wed, 03 Dec 2008 16:29:07 GMT

HI Paddy,

The Yield function in an OS will make a high priority task give way to the ones with lower priority. It prevents the other threads/taks from starvation.

So What I understand from your post is - you are calling Yield from infinite loop. Are you placing the yield function after doing all the things in your whle(1)

Like:
while(1)
{
-----DO Tasks----
Yield();
}

Try doing a task sleep instead. I understand that there are other tasks which have to be suchronised with this one. Are you using any mutex/semaphore to ensure that you are reading the data after it is written??

Re: problem occurs when i integrated my code with Coldfire_Lite project

paddy — Wed, 03 Dec 2008 22:37:37 GMT

Hi Rich,

The control stays in the ISR routine when i run the program, i have attached the ISR routine for your refernce.

Kindly suggest me.

Thanks & Regards,

Re: problem occurs when i integrated my code with Coldfire_Lite project

RichTestardi — Wed, 03 Dec 2008 23:22:24 GMT

Hi,

I'm not sure what "ProcessLCDData();" does, but I assume it returns promptly and does not call *any* task switching functions.

When you say that the control stays in the ISR, what is the stack trace at the time? Where is the ISR looping, or did you accidentally call a task switching function from the ISR and some other task has now "taken over" the ISR stack?

-- Rich

Re: problem occurs when i integrated my code with Coldfire_Lite project

paddy — Wed, 03 Dec 2008 23:39:11 GMT

Hi Rich,

The LCD will send back the character, based upon the carriage return ProcessLCDData() is called. I am using two soft buttons in LCD when it pressed it will send buuton id to handle this operation the above function is used.

i am not calling any task switching from ISR,when i do F11 the control goes from ISR to task.c tk_block() function