On Thu, May 12, 2011 at 7:49 PM, <[email protected]> wrote:
> Hi,
> I have some TinyOS related questions!
>
> Whats the difference between:
> a.) signal event(...);
> b.) atomic signal event(...);
This means the code section within the atomic curly braces (or the
line in this case) will execute without preemption.
> What kind of code is more efficiency and what does the async event here mean?
Async events are those triggered by interruptions.
> a.)
> async event void Int0.fired()
> {
> ....
> signal PHY.data_arrived();
> }
>
> event void PHY.data_arrived() {
> uint16_t rcv_crc = 0;
> uint16_t calc_crc = 0;
>
> call PHY.extract(...); /// do memcpy, takes about 1-2ms
>
> // calc checksum
> rcv_crc = ....
> calc_crc = call Crc.crc16(....);
>
> // if checksum is correct we signal
> if(rcv_crc == calc_crc)
> {
> atomic signal Radio.receive(...);
> }
> else
> {
> printf("crc wrong\n");
> printfflush();
> }
> }
>
> b.)
> async event void Int0.fired()
> {
> ....
> signal PHY.data_arrived();
> }
>
> event void PHY.data_arrived() {
> post task_data_arrived();
> }
>
> task void task_data_arrived() {
> uint16_t rcv_crc = 0;
> uint16_t calc_crc = 0;
>
> call PHY.extract(...); /// do memcpy
>
> // calc checksum
> rcv_crc = ....
> calc_crc = call Crc.crc16(....);
>
> // if checksum is correct we signal
> if(rcv_crc == calc_crc)
> {
> atomic signal Radio.receive(...);
> }
> else
> {
> printf("crc wrong\n");
> printfflush();
> }
> }
> --
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>
--
--
Antonio Liñan Colina
R+D+I Engineer
@: [email protected]
@: [email protected]
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