Thank you for your prompt response. I realize that this problem may be due
to MicaZ using hardware ACK. I am trying to develop a Localization
(position finding) application. For this purpose I find that it is better
to use my own ACK packet at the application level rather than the link
level ACK.
Thanks anyway,
Chandrika
> It's entirely possible that the ack field is defaulted ON
> when not being used. Also, I haven't looked that
> carefully, but I seem to remember that the 'Z radio has
> a hardware level ACK and the the MacControl disable is
> only for the software level used in the mica2...
> You'd have to search through the radio code to see how it's handled.
>
> MS
>
> [EMAIL PROTECTED] wrote:
>> Hi,
>> I have a question regarding acknowledgments in micaz. I am using the
>> following module and calling the MacControl.disableAck(). However I am
>> still able to receive acks.
>> I was wondering how this is possible??
>>
>> Thanks,
>> Chandrika
>>
>>
>> module MyAppM
>> {
>> provides {
>> interface StdControl;
>> }
>> uses {
>> interface Timer;
>> interface SendMsg;
>> interface ReceiveMsg;
>> interface Leds;
>> interface MacControl;
>> }
>> }
>>
>> implementation
>> {
>> TOS_Msg m_msg;
>> int m_int;
>> bool sending_packet = FALSE;
>>
>> command result_t StdControl.init() {
>> m_int = 0;
>> call Leds.init();
>> return SUCCESS;
>> }
>>
>> command result_t StdControl.start() {
>> call MacControl.disableAck();
>> if( TOS_LOCAL_ADDRESS == 1 ){
>> call Timer.start( TIMER_REPEAT, 5000 );
>> }
>> return SUCCESS;
>> }
>>
>> command result_t StdControl.stop() {
>> return SUCCESS;
>> }
>>
>> event result_t Timer.fired() {
>> if( sending_packet == FALSE ) {
>> CountMsg_t* body = (CountMsg_t*)m_msg.data;
>> body->n = m_int;
>> body->src = TOS_LOCAL_ADDRESS;
>> if( call SendMsg.send( 2, sizeof(CountMsg_t), &m_msg ) == SUCCESS
>> ) {
>> call Leds.set( m_int );
>> sending_packet = TRUE;
>> }
>> }
>> //m_int++;
>> return SUCCESS;
>> }
>>
>> event result_t SendMsg.sendDone( TOS_MsgPtr msg, result_t success ) {
>> if (msg->ack)
>> m_int++;
>> sending_packet = FALSE;
>> return SUCCESS;
>> }
>>
>> event TOS_MsgPtr ReceiveMsg.receive( TOS_MsgPtr msg ) {
>> if( TOS_LOCAL_ADDRESS != 1 ){
>> CountMsg_t* body = (CountMsg_t*)(&msg->data[0]);
>> call Leds.set( body->n );
>> }
>> return msg;
>> }
>> }
>>
>>
>>
>> _______________________________________________
>> 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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