This is a good advice, I'll try this first check.
For the packet structure I have no problem, I'm developping a little
application for MDA300, and I can read the other datas that I put in the
payload without problems, well the problem is not with the packet.
It's possible that there's some problem with the management of data type
int32_t? I can use this kind of data as well as the int16_t?
Thanks.
Ing. Alessandro Balvis
Centro Ricerche ENEL - Pisa
[EMAIL PROTECTED]
> Signor Balvis,
> una prima (grezza) controprova potrebbe essere quella di (se conosce
> quanto deve essere il valore
> corretto del risultato in anticipo) accendere dei led se il valore è
> quello giusto. Del tipo:
>
> if (zz.s[0] == <VALORE CORRETTO>) && (zz.s[1] == < VALORE CORRETTO >) &&
> .. )
> call Leds.redOn();
>
> Se il led si accende il risultato è corretto ma ci sono dei problemi
> nell'invio. In questo caso
> il problema è quasi sicuramente nel buffer di invio. Perchè accede a
> partire dalla posizione 10
> di data ? Provi da 0.
> Inoltre ha allocato un messaggio di tipo Tos_Msg a cui poi farà puntare
> il puntatore
> radio_msg_ptr ?
> Si assicuri che tutto funzioni mettendo nel pacchetto quantità note e
> vedendo se vengono
> visualizzate correttamente.
>
> Cordiali saluti
> Andrea
>
>
>
> [EMAIL PROTECTED] wrote:
>
>>Hy,
>>I've implemented an algorithm of integer FFT for micaz, but I've some
>>problems:
>>
>>1) I tested the FFT with TOSSIM for check the correct result and it works
>>
>>2) I tested the FFT on micaz, but I can't read the result of the
>>computation, because I put the result in a int32_t variable and when I go
>>to write this variable in the packet (to read the packet with
>>MessageCenter java) it writes "zero". I thought that the problem was in
>>the different data types: the value in the packet must be int16_t, the
>>result is in int32_t. Then I used a type union:
>>
>>typedef union {
>> int8_t s[4];
>> int32_t i;
>> } UDATA;
>>
>>UDATA z;
>>
>>
>>In this way I can put the result in:
>>
>>z.i=(int32_t)result;
>>
>>and when I go to write the result in the packet I use the union:
>>
>>radio_msg_ptr->data[10] = zz.s[0];
>>radio_msg_ptr->data[10+2] = zz.s[1];
>>radio_msg_ptr->data[10+4] = zz.s[2];
>>radio_msg_ptr->data[10+6] = zz.s[3];
>>
>>But it still doesn't work. Why??
>>Can anybody help me? Thanks in advance.
>>
>>PS: I put the code of the FFT computation
>>
>>
>>int16_t FFT(int16_t kk[], int16_t fr[], int16_t isign, int16_t *Ampl,
>>int16_t *Freq) {
>>
>>
>> //variables for trigonometric recurrences
>> int32_t a,b,c,d,i,m;
>> int16_t idx,max,rms;
>> a = b = c = 0;
>>
>> call Leds.yellowOn();
>> BinaryInversion(datas);
>> Danielson(datas,isign);
>> max = 0; idx = 0;
>> rms = 1414L;
>> for (i=0,m=0;i<NSIGNAL;i+=2,m++) {
>> a=(int32_t)(kk[i]*kk[i]);
>> b=(int32_t)(kk[i+1]*kk[i+1]);
>> c = sqrt(c);
>> c=(a+b);
>> c=sqrt(c);
>> d=((c*100)/NSIGNAL)/100;
>> fr[m]=(d*rms)/1000;
>> if(fr[m]>max) {
>> max=fr[m];
>> z.i=fr[m];
>> idx=m;
>> }
>> }
>>
>> *Ampl = max; //memorizzati il valore di picco e la
>>componente relativa li memorizzo nel pacchetto
>> *Freq = idx;
>> call Leds.yellowOff();
>> post send_radio_msg();
>> return(0);
>> }
>>
>>
>>Ing. Alessandro Balvis
>>Centro Ricerche ENEL - Pisa
>>[EMAIL PROTECTED]
>>
>>_______________________________________________
>>Tinyos-help mailing list
>>[email protected]
>>https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
>>
>>
>>
>>
>
>
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