Re: [avr-gcc-list] Bizarre string problem

[Ian Caddy]

Hi Andre,

In your code snippet, why do you use "T" instead of 'T' for the 
character array.

The code snippet should look like:

char t[1] = 'T';
UDR = t[0];

If you want to copy a string into a char array, you should use string copy:

strcpy(t, "Test");

assuming your array t was big enough to handle the length of the string 
"Test" which is 5 chars, 4 and a NULL.

The other option is to use a limited length copy called strncpy:

strncpy(t, "Test", sizeof(t));

In your emample you may have been wanting to use a char pointer instead, 
such as:

char *t = "T";
UDR = t[0];

This should print out the letter T.

I hope this helps.

regards,

Ian Caddy


André - BOL wrote:

> Please, help me... I was trying to use UART (atmega32) when I realized
> something very strange.
>  
> For example: (I'm ommiting a lot of code, of course)
> chat t = 'T';
> UDR = t;  
> ==> this correctly prints T in my HyperTerminal
>  
> char t[1] = "T";
> UDR = t[0];
> ==> this prints nothing (Blank space)
>  
> I realized writing t[0] to any PORT lights test leds showing that the
> value is always 0xff !!!  This problem is giving me a huge head-ache.
> There's nothing wrong with this code (from C's point of view). Is there
> anything special I should be doing?
>  
> Please help me... I'm about to give up avr-gcc. I am generating hex code
> and programming the device using Bascom. I don't think that explains
> anything, but if anyone can show me how to use avr-dude I'd be very glad
> to. It's a very simple single-file project. Uisp doesn't seem to work
> under Windows.
>  
> Thanks a lot in advance!
> Andre
>  
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