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i need help with pointer array function parameter

 
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freesat



Joined: 08 Feb 2011
Posts: 32

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i need help with pointer array function parameter
PostPosted: Sat Jul 05, 2014 6:52 pm     Reply with quote

Hi guys, i need to send an array of bytes to a function that will write it on spi, like this pseudo code:

Code:

int8 function write( int8 *data ) {
  for( idx=0;idx++;idx=sizeof(data) ) {
      spi_write( data[idx] );
  }

  return 0;
}

void main () {
  initialize....
   
  // the array size is not fixed, i need send from 2 to 40 bytes at time, but is array values are hard coded.
  status = write( {0x26,0x01,0x30,0x55} );
}


How can i do that in ccs ? someone can write a sample code?

I will appreciate some help!

thanks...
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Jul 05, 2014 9:15 pm     Reply with quote

The simple way is just to define your function with two parameters.
The first one is a pointer to the array. The second one is the array size
in bytes, or the number of bytes that you want to be processed in the
array. In other words, you pass the size along with your array pointer.

Here's how you would call it:
Code:
result = function_write(my_array, sizeof(my_array));


Here's some more. I just did a search and Ttelmah has sample code for
you in this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=48285
Ttelmah



Joined: 11 Mar 2010
Posts: 19329

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PostPosted: Sun Jul 06, 2014 12:58 am     Reply with quote

Also, this thread:

<http://www.ccsinfo.com/forum/viewtopic.php?t=52242&highlight=array+sizeof>

Covers why the called function can't know the 'size' of what is passed, without this being also sent.
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