coulombcounterp.nc

tinyos-2.x.rar

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/**
 * Implementation of coulomb counter board interface for eyesIFXv2.1
 * @author: Andreas Koepke ([e-mail])
 */

#include "Timer.h"

module CoulombCounterP {
    provides {
        interface CoulombCounter;
        interface Init;
    }
    uses {
        interface Timer<TMilli> as Timer;
        interface GpioInterrupt as EnergyInterrupt;
        interface GeneralIO as EnergyPin;
        interface GeneralIO as UsbBatSwitch;
        interface GeneralIO as ResetBoard;
        interface GeneralIO as UsbMonitor;
    }
}
implementation {
#define MIN_DELAY 60
    
    uint16_t timerHighBits = 0;
    uint32_t dur = 0;
    bool warned = FALSE;
    
    void resetBoard() {
        call ResetBoard.set();
        __asm__("NOP");
        call ResetBoard.clr();        
    }

    void startMeasure() {
        unsigned i;
        for(i = 0; i < 7; i++) {
            call UsbBatSwitch.set();
            call UsbBatSwitch.clr();
        }
    }

    void stopMeasure() {
        call UsbBatSwitch.set();
        call UsbBatSwitch.clr();
        // if your board allows it: delay until supply via USB stable
        resetBoard();
    }
    
    command error_t Init.init() {
        call EnergyPin.makeInput();
        call EnergyInterrupt.disable();
        
        call UsbBatSwitch.makeOutput();
        call UsbBatSwitch.clr();
        
        call ResetBoard.makeOutput();
        call ResetBoard.clr();
        
        call UsbMonitor.makeInput();
        if(!call CoulombCounter.isMeasureing()) {
            resetBoard();
        }
        return SUCCESS;
    }

    async command bool CoulombCounter.isMeasureing() {
        return call UsbMonitor.get(); // high --> disconnected --> measuremode
    }

    void startLongTimer() {
        if(timerHighBits) {
            timerHighBits--;
            call Timer.startOneShot(-1);
        }
        else {
            call Timer.startOneShot(dur);
        }
    }
    
    command error_t CoulombCounter.start(uint32_t delay, uint32_t duration) {
        error_t result = SUCCESS;
        
        timerHighBits = duration >> 22;
        dur = duration * (uint32_t)1024;
        warned = FALSE;
        if(call CoulombCounter.isMeasureing()) {
            startLongTimer();
            call EnergyInterrupt.enableFallingEdge();
        }
        else {
            if((delay < MIN_DELAY) || (delay > ((uint32_t)1<<21))) {
                result = FAIL;
            }
            else {
                call Timer.startOneShot(delay * (uint32_t)1024);
            }
        }
        return result;
    }

    /** Stop a measurement, returns FAIL if there is no ongoing measurement */
    command error_t CoulombCounter.stop() {
        error_t result = FAIL;
        call Timer.stop();
        timerHighBits = 0;
        dur = 0;
        call EnergyInterrupt.disable();
        if(call CoulombCounter.isMeasureing()) {
            stopMeasure();
            result = SUCCESS;
        }
        return result;
    }

    async event void EnergyInterrupt.fired() {
        signal CoulombCounter.portionConsumed();
    }
    
    event void Timer.fired() {
        if(call CoulombCounter.isMeasureing()) {
            if(timerHighBits) {
                startLongTimer();
            }
            else {
                if(warned == TRUE) {
                    call CoulombCounter.stop();
                }
                else {
                    signal CoulombCounter.soonOver();
                    call Timer.startOneShot((uint32_t)MIN_DELAY*1024);
                    warned = TRUE;
                }
            }
        }
        else {
            // finished waiting for delay
            resetBoard();
            startLongTimer();
            call EnergyInterrupt.enableFallingEdge();
            startMeasure();
        }
    }
}