You're on the right track but should use bit shift operators rather
then division to get values into bytes, something like:
a = (uint8) (uintval & 0xff000000) >> 24;
You will also need to be careful that you do all this with
unsigned ints or sprinkle "& 0xff"'s all over the place to
avoid sign extension problems.
Another perhaps easier way is to use a union like:
union
{
uint32 uintval;
uint8 bytes[sizeof uint32];
} bunion;
which you can then use it like this:
bunion x;
x.uintval = 0x12345678;
a = x.bytes[0];
But I think you may have to deal with byte ordering issues if
you go cross platform. There's another really tricky way to do
this that I have completely forgotten and the example I have
_may_ be hidden on another machine in my massively parallel
filing system...I _could_ (perhaps) find it if you really
need it...
MS
Lorena Aguirre wrote:
> Hello,
>
> I'm trying to do a task to pass from Hex to Decimal (from uint 32 to uint8)
> I have uint32 (ABCD) and I want 4 uint8 with 'A', another 'B', another
> 'C' and another 'D'.
> The task I created is the following but it doesn't work, Could anyone
> help me please?
>
> //----------------------------task mascara
> //TAREA mascar entero 32 a entero8
> task void mascara(){
> t1 = call Localizar.get();
> tiempo2 = t1;
> tiempo1A = tiempo1 & 0xFF000000; /* pasamos a hexadecimal*/
> tiempo1A = tiempo1A / 0xFFFFFF;
> tiempo1 = tiempo2;
> tiempo1B = tiempo1 & 0xFF0000;
> tiempo1B = tiempo1B / 0xFF00;
>
> tiempo1 = tiempo2;
>
> tiempo1C = tiempo1 & 0xFF00;
> tiempo1C = tiempo1C / 0xFF;
> tiempo1 = tiempo2;
> tiempo1D = tiempo1 & 0xFF;
>
> }
>
> //----------------------------in the task RadioSendTask I call task mascara
> task void RadioSendTask() {
>
> dbg(DBG_USR1, "MiTOSBase forwarding UART packet to Radio\n");
>
> if (radioCount == 0) {
>
> radioBusy = FALSE;
>
> } else {
>
> radioQueueBufs[radioOut].group = 0x7D; // antes TOS_AM_GROUP
> //este start de error. Sin arrancarlo no da errores.
> //call Localizar.start();
> //capturamos t1 para calculo de RTT
> temps1 = call Localizar.get();
> post mascara();
> radioQueueBufs[radioOut].data[2] = tiempo1A;
> radioQueueBufs[radioOut].data[2] = tiempo1B;
> radioQueueBufs[radioOut].data[2] = tiempo1C;
> radioQueueBufs[radioOut].data[2] = tiempo1D;
> if (call RadioSend.send(&radioQueueBufs[radioOut]) == SUCCESS) {
> call Leds.redToggle();
> } else {
> failBlink();
> post RadioSendTask();
> }
> }
> }
>
> Thanks!
> Lorena
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> Tinyos-help mailing list
> [email protected]
> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
--
Platform: WinXP/Cygwin
TinyOS version: 1.x, Boomerang
Programmer: MIB510
Device(s): Mica2, MicaZ, Tmote
Sensor board: homebrew
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