8-bit Microcontrollers中的主题 Re: Floating-point Math problem, MC9S08PT60

Floating-point Math problem, MC9S08PT60

AndreiLuchuk — Thu, 29 Oct 2020 09:31:58 GMT

Having an issue I can't resolve, the following lines of code cause a reset

   FLOAT32 fPct100 = 100.00;   FLOAT32 fPct18  = 18.00;   FLOAT32 fPvPercent;    FLOAT32 fBarGraphPercent;   UINT32  nBarGraphSegment   = 0;   fPvPercent = gfPVPercent * fPct100;   fBarGraphPercent = (UINT32)(fPvPercent / NUM_BG_SEGENTS);      //fPvPercent = 20.0000;      fPvPercent = (fPvPercent / fPct100);      //problem here      fPvPercent = fPvPercent / fPct18;         //problem here

it is possible to step through this statement and hit brakepoints at the end of main loop. however, running is not working. i can't catch the reset with Cpu_OnReset either.

Using CWIDE 10.2 with the latest updates.

any suggestions are greatly appreciated.

Re: Floating-point Math problem, MC9S08PT60

CompilerGuru — Sat, 21 Jul 2012 09:42:18 GMT

Make sure you are not running out of stack. Increase the STACKSIZE in the prm file

(not sure where to set the stack size with Processor Expert).

Daniel

Re: Floating-point Math problem, MC9S08PT60

AndreiLuchuk — Mon, 23 Jul 2012 19:32:49 GMT

Thanks for looking in, Daniel.

I've increased the stack from 0x0080 to 0x0500, but no solution. How much stack does this need?

Re: Floating-point Math problem, MC9S08PT60

CompilerGuru — Tue, 24 Jul 2012 21:15:29 GMT

Not that much :smileyhappy:.

Thought 0x80 feels a bit low when using floating point arithemtic.

To see how much stack it needs, search for STACKSIZE in the forums. Also one way:

https://community.freescale.com/message/115600#115600

Another cause might be the COP/watch dog timer, try disabling it temporarly to see.

Otherwise, I would recommend to create a small example app showing your issue.

Daniel