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/* $Id: MultiplexedReadC.nc,v 1.1 2007-02-08 17:49:05 idgay Exp $
* Copyright (c) 2005 Intel Corporation
* All rights reserved.
*
* This file is distributed under the terms in the attached INTEL-LICENSE
* file. If you do not find these files, copies can be found by writing to
* Intel Research Berkeley, 2150 Shattuck Avenue, Suite 1300, Berkeley, CA,
* 94704. Attention: Intel License Inquiry.
*/
/**
* Multiplex access to a single Read interface for a parameterised
* Read interface whose access is controlled by an arbiter.
*
* @param width_t Width of the underlying Read interface.
*
* @author David Gay
*/
generic module MultiplexedReadC(typedef width_t) {
provides interface Read<width_t>[uint8_t client];
uses {
interface Read<width_t> as Service;
interface Resource[uint8_t client];
}
}
implementation {
command error_t Read.read[uint8_t client]() {
return call Resource.request[client]();
}
event void Resource.granted[uint8_t client]() {
call Service.read();
}
event void Service.readDone(error_t result, width_t data) {
uint8_t client = call ArbiterInfo.userId();
call Resource.release[client]();
signal Read.readDone[client](result, data);
}
default async command error_t Resource.request[uint8_t client]() {
return FAIL;
}
default async command error_t Resource.release[uint8_t client]() { return FAIL; }
default event void Read.readDone[uint8_t client](error_t result, width_t data) { }
}
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