cc2420activemessagec.nc

tinyos-2.x.rar

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/**
 * Pseudo module to enable MultihopLqi on eyesIFX. The mapping of
 * strength to LQI is based on the packet delivery ratio.  For CC2420
 * the ratios were taken from: Kannan Srinivasan and Philip Levis:
 * "RSSI is Under Appreciated" Third Workshop on Embedded Networked
 * Sensors, EmNets 2006.
 * 
 * @author Andreas Köpke <[e-mail]>
 */

#include "radiopacketfunctions.h"

module CC2420ActiveMessageC {
    provides {
        interface CC2420Packet;
    }
}
implementation {
    async command uint8_t CC2420Packet.getPower(message_t* p_msg ) {
        return 31;
    }
    async command void CC2420Packet.setPower(message_t* p_msg, uint8_t power) {
    }
    async command int8_t CC2420Packet.getRssi(message_t* p_msg ) {
        return (getMetadata(p_msg))->strength;
    }
    async command uint8_t CC2420Packet.getLqi( message_t* p_msg ) {
        uint32_t s = (getMetadata(p_msg))->strength;
        if(s > 60) s = 10;
        if(s > 22) s = 22;
        return (s*13/5 + 48);
    }
}