[Tinyos-help] Fill first 8 bytes with memcpy

Felipe Cruz Martínez felipecruz91 at hotmail.es
Thu Aug 9 07:28:02 PDT 2012


Hi all,

i want to fill the first 8 bytes of a uint8_t* pointer with the values 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08, and send it by radio (micaz motes):

This is the code of my app (App.nc):
<----------------------------------------------------  
    uint8_t* pointer;

    call interface.function(pointer);
----------------------------------------------------->    

In other module/file, i have got the implementation of that function:
<------------------------------------------------------------------------------------------------------------------------------------    

    command void interface.function(uint8_t* pointer) 
    {
        uint8_t x = 1;

        memset(pointer, 0, 8*sizeof(uint8_t)); //For security, fill the first 8 bytes of the pointer with ‘0x00’

        for(i=0; i<8; i++) {
               
            memcpy(pointer+i, &x, sizeof(uint8_t));
            printf("pointer[%d]: 0x%02X \n", i, pointer[i]);
            x++;
        }
   }
------------------------------------------------------------------------------------------------------------------------------------>    

Output:

pointer[1614823456ð]: 0x00 
pointer[1]: 0x00 
pointer[2]: 0x03 
pointer[3]: 0x04 
pointer[4]: 0x05 
pointer[5]: 0x06 
pointer[6]: 0x07 
pointer[7]: 0x08 

As you can see, first two bytes of the pointer are wrong.
First byte of pointer got a wrong index: ‘1614823456ð’, and his value should be pointer[0] = 0x01
Second byte got a correct index, but a value of ‘0x00’, when it should be pointer[1] = 0x02

What i’m doing wrong? I hope that someone can help me, i took several days without solving this problem.

Thanks for your time,
Felipe.
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