Michiel: it is make sense to have GpioInterrupt interface support both edge and level triggering anyway, if GpioInterrupt trigger has not any critical thing to do with tinyos scheduler or executive model driven by events. And, from hw and user side, we can do a choice between them.
thx lot. Best regards shan 2008/9/25 Michiel Konstapel <[EMAIL PROTECTED]>: > That's not quite true - sometimes you need them due to hardware > limitations. For example, in sleep mode the Atmega128 can only do edge > triggering on INT0-3; on INT4-7 it can only do level triggering. > However, the GpioInterrupt interface doesn't let you select this, so you > can't use those interrupts to wake up the device unless you use the > platform dependent HPL interrupt interface. > Michiel > >> -----Original Message----- >> From: [EMAIL PROTECTED] [mailto:tinyos-help- >> [EMAIL PROTECTED] On Behalf Of Jim Fell >> Sent: maandag 22 september 2008 20:34 >> To: shan >> Cc: tinyos-help@millennium.berkeley.edu >> Subject: Re: [Tinyos-help] level trigger for interrupt >> >> Hello Shan, >> >> It's my assumption that the reason is because level-triggers are not >> practical for most applications. The reason for having an interrupt > at >> all is to handle some event that happens in the physical (i.e. "real") >> world. A level trigger would essentially be the same a polling the >> port, which can be easily done in your main program loop. >> >> Best regards, >> >> -Jim >> >> >> -----Original Message----- >> From: [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] On Behalf Of shan >> Sent: Saturday, September 20, 2008 9:13 PM >> To: tinyos-help@millennium.berkeley.edu >> Subject: [Tinyos-help] level trigger for interrupt >> >> Hi, >> Why does GpioInterrupt not support level trigger, only support edge >> trigger ? >> Can anyone tell me the internal or reason ? >> >> Best regards >> shan > _______________________________________________ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
