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nxtDisplay... strings cause Click of Death in 3.62

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nxtDisplay... strings cause Click of Death in 3.62

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kfilar

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Joined: Fri Nov 19, 2010 3:34 pm
Posts: 14

nxtDisplay... strings cause Click of Death in 3.62

On 2 different bricks, the following code works fine in RobotC for Mindstorms +Tetrix 3.55, but causes the NXT Click of Death in 3.62:


	Code: task main(){ int counter = 0; while (counter < 30) { counter++; eraseDisplay(); nxtDisplayBigTextLine(1, "%s", "Test"); // same result with nxtDisplayCenteredBigTextLine() nxtDisplayBigTextLine(3, "%d", counter); // same result with nxtDisplayCenteredBigTextLine() wait1Msec(200); } }

The following code, changing the line 1 parameter from a string to a string variable, fixes it:


	Code: task main(){ int counter = 0; string msg = "Test"; while (counter < 30) { counter++; eraseDisplay(); nxtDisplayBigTextLine(1, "%s", msg); // same result with nxtDisplayCenteredBigTextLine() nxtDisplayBigTextLine(3, "%d", counter); // same result with nxtDisplayCenteredBigTextLine() wait1Msec(200); } }

Could you shed some light on what's going on? Are you able to reproduce this?
Thanks,

Wed Dec 25, 2013 2:29 pm

mightor

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Joined: Wed Mar 05, 2008 8:14 am
Posts: 3164
Location: Rotterdam, The Netherlands

Re: nxtDisplay... strings cause Click of Death in 3.62

A bug it may be, but why would you use nxtDisplayBigTextLine(1, "%s", "Test"); and not nxtDisplayBigTextLine(1, "Test"); ?

= Xander

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Wed Dec 25, 2013 5:31 pm

kfilar

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Joined: Fri Nov 19, 2010 3:34 pm
Posts: 14

Re: nxtDisplay... strings cause Click of Death in 3.62

Well, eliminating the "%s" is certainly how we'll fix our code.

That seems to be the only issue with 3.62 we've found so far.

FTC 6002

Fri Dec 27, 2013 12:19 pm

mightor

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Joined: Wed Mar 05, 2008 8:14 am
Posts: 3164
Location: Rotterdam, The Netherlands

Re: nxtDisplay... strings cause Click of Death in 3.62

It's deffo a bug, however, it's easy to work around it

= Xander

Fri Dec 27, 2013 12:46 pm

kfilar

Rookie

Joined: Fri Nov 19, 2010 3:34 pm
Posts: 14

Re: nxtDisplay... strings cause Click of Death in 3.62

Easy to work around, but a nasty one though. Compiles just fine. It's only when your code runs across that statement that it goes into the click of death with very little to hint at what happened.

Sat Dec 28, 2013 10:08 am

Ford Prefect

Guru

Joined: Sat Mar 01, 2008 12:52 pm
Posts: 1030

Re: nxtDisplay... strings cause Click of Death in 3.62

then you're quite lucky to have RobotC to program with, getting even "very little to hint at what happened".
I just got a few steps of experience with "real" C.
Here you do not even get the slightest hint when everything just dissolves into nothingness.

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#define S sqrt(t+2*i*i)<2
#define F(a,b) for(a=0;a<b;++a)
float x,y,r,i,s,j,t,n;task main(){F(y,64){F(x,99){r=i=t=0;s=x/33-2;j=y/32-1;F(n,50&S){t=r*r-i*i;i=2*r*i+j;r=t+s;}if(S){PutPixel(x,y);}}}while(1)}

Sat Dec 28, 2013 10:28 am

mightor

Moderator

Joined: Wed Mar 05, 2008 8:14 am
Posts: 3164
Location: Rotterdam, The Netherlands

Re: nxtDisplay... strings cause Click of Death in 3.62

Ford,

With remote gdb you can do it, but you'd have to learn how to use this very powerful (and hard to use) tool. ROBOTC's debugger is much easier to use. When I have issues like this, I will often leave "breadcrumbs" as I go through the program, using writeDebugStreamLine();

= Xander

Sat Dec 28, 2013 10:39 am

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