exception handling by micro controller

dr.akshay_1980@yahoo.com over 10 years ago

I want to know if there is any feasible method for the micro controller to handle divide by zero or any other exception encountered while doing mathematical calculations or solving complex algos.. I don't want my controller board to be reset after encountering this or I want to use watch dog timer in order to overcome this.

My C code routine for the micro controller is not capable of handling this real time problem while doing some complex calculations..What should I do.??????

Thanks,

Akshay

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michaelkellett over 10 years ago in reply to dr.akshay_1980@yahoo.com +2

8051 processors don't support exceptions (you probably know that). If I were you I would move over to using CortexM4 which does offer a divide by zero exception and much better debugging than any 8051…

0 michaelkellett over 10 years ago

You might start by telling us which micro controller you are using .

If it has no hardware detection of such problems then you have no alternative but to design the solution into your software.

In 40 years (approx) of micro controller design work I have never had a case where this could not be done.

MK
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0 dr.akshay_1980@yahoo.com over 10 years ago in reply to michaelkellett

I have just started experimenting my algorithm with low end controller 8051 series. The board while running encounters 0 (zero) as denominator while solving the complex mathematical calculation and thus freezes up in the middle and getting stuck somewhere. I was trying to use 'TrY and Catch' situation when handling this type of exception but my compiler doesn't allow me to use or I don't know the way to implement this in embedded as its somewhat OOP approach toward embedded systems.

Eventually I will be porting my code to high end controllers such as ARM / freescale imx
I am using P89V51RD2 series from philips and other is C8051F020 from silicon labs..

Do add me in your contact list...

Bye,
cheers
Akshay
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0 dr.akshay_1980@yahoo.com over 10 years ago in reply to dr.akshay_1980@yahoo.com

P.S.
other way around I am trying to use watch dog timer when my board encounters exception and it will get reset but I don't wanna reset my board..

Bye,
Akshay
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0 michaelkellett over 10 years ago in reply to dr.akshay_1980@yahoo.com

8051 processors don't support exceptions (you probably know that).

If I were you I would move over to using CortexM4 which does offer a divide by zero exception and much better debugging than any 8051 parts.

(It might be a good idea to debug your algorithm more before writing any code so that you can see where errors can occur.)

You can buy a board with an STM32F4xx on it for less than £10 and use the Keil/ARM free tools until the code is greater than 32k.

MK
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0 clem57 over 10 years ago in reply to dr.akshay_1980@yahoo.com

@Akshay Sharma
You may have solved this! May I suggest if the denominator is float, add a small float value to bottom to avoid divide by zero if you do not want to test for it. This will add a slight skew to the results that may be tolerable.

Clem
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