thermo.c

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/*#*
 *#* $Log$
 *#* Revision 1.3  2006/09/20 20:12:41  marco
 *#* Names convention, MOD_* macros.
 *#*
 *#* Revision 1.2  2006/07/19 12:56:26  bernie
 *#* Convert to new Doxygen style.
 *#*
 *#* Revision 1.1  2005/11/04 17:59:47  bernie
 *#* Import into DevLib.
 *#*
 *#*/
#include <thermo_map.h>
#include <hw_thermo.h>

#include <drv/thermo.h>
#include <drv/timer.h>
#include <drv/ntc.h>

#include <cfg/macros.h>
#include <cfg/debug.h>


#define THERMO_INTERVAL_MS      100

#define THERMO_HIFI_NUM_SAMPLES 10

static Timer thermo_timer;

typedef struct ThermoControlDev
{
    deg_t          hifi_samples[THERMO_HIFI_NUM_SAMPLES];
    deg_t          cur_hifi_sample;
    deg_t          target;
    thermostatus_t status;
    ticks_t        expire;
} ThermoControlDev;

ThermoControlDev devs[THERMO_CNT];


thermostatus_t thermo_status(ThermoDev dev)
{
    return devs[dev].status;
}


static void thermo_do(ThermoDev index)
{
    ThermoControlDev* dev = &devs[index];
    deg_t cur_temp;
    deg_t tolerance = thermo_hw_tolerance(index);

    cur_temp = thermo_hw_read(index);

    // Store the sample into the hifi FIFO buffer for later interpolation
    dev->hifi_samples[dev->cur_hifi_sample] = cur_temp;
    if (++dev->cur_hifi_sample == THERMO_HIFI_NUM_SAMPLES)
        dev->cur_hifi_sample = 0;

    cur_temp = thermo_readTemperature(index);

    if (cur_temp == NTC_SHORT_CIRCUIT || cur_temp == NTC_OPEN_CIRCUIT)
    {
        if (cur_temp == NTC_SHORT_CIRCUIT)
        {
            #ifdef _DEBUG
            if (!(dev->status & THERMOERRF_NTCSHORT))
                kprintf("dev[%d], thermo_do: NTC_SHORT\n",index);
            #endif
            dev->status |= THERMOERRF_NTCSHORT;
        }
        else
        {
            #ifdef _DEBUG
            if (!(dev->status & THERMOERRF_NTCOPEN))
                kprintf("dev[%d], thermo_do: NTC_OPEN\n", index);
            #endif
            dev->status |= THERMOERRF_NTCOPEN;
        }

        /* Reset timeout when there is an ntc error */
        dev->expire = thermo_hw_timeout(index) + timer_clock();
        thermo_hw_off(index);
        return;
    }
    dev->status &= ~(THERMOERRF_NTCOPEN | THERMOERRF_NTCSHORT);

    if ((cur_temp < dev->target - tolerance) || (cur_temp > dev->target + tolerance))
    {
        dev->status &= ~THERMO_TGT_REACH;

        /* Check for timeout */
        if (timer_clock() - dev->expire > 0)
        {
            dev->status |= THERMOERRF_TIMEOUT;
            kprintf("dev[%d], thermo_do: TIMEOUT\n", index);
        }
    }
    else /* In target */
    {
        /* Clear errors */
        dev->status &= ~THERMO_ERRMASK;
        dev->status |= THERMO_TGT_REACH;

        /* Reset timeout in case we go out of target in the future */
        dev->expire = thermo_hw_timeout(index) + timer_clock();
    }

    if (cur_temp < dev->target)
        dev->status = (dev->status | THERMO_HEATING) & ~THERMO_FREEZING;
    else
        dev->status = (dev->status & ~THERMO_HEATING) | THERMO_FREEZING;

    thermo_hw_set(index, dev->target, cur_temp);

}


static void thermo_softint(void)
{
    int i;
    for (i = 0; i < THERMO_CNT; ++i)
        if (devs[i].status & THERMO_ACTIVE)
            thermo_do((ThermoDev)i);

    timer_add(&thermo_timer);
}


void thermo_setTarget(ThermoDev dev, deg_t temperature)
{
    ASSERT(dev < THERMO_CNT);
    devs[dev].target = temperature;
    devs[dev].expire = timer_clock() + thermo_hw_timeout(dev);

    kprintf("setTarget dev[%d], T[%d.%d]\n", dev, temperature / 10, temperature % 10);
}

void thermo_start(ThermoDev dev)
{
    int i;
    deg_t temp;

    ASSERT(dev < THERMO_CNT);

    devs[dev].status |= THERMO_ACTIVE;

    /* Initialize the hifi FIFO with a constant value (the current temperature) */
    temp = thermo_hw_read(dev);
    for (i = 0; i < THERMO_HIFI_NUM_SAMPLES; ++i)
        devs[dev].hifi_samples[i] = temp;
    devs[dev].cur_hifi_sample = 0;

    /* Reset timeout */
    devs[dev].expire = timer_clock() + thermo_hw_timeout(dev);
}

void thermo_stop(ThermoDev dev)
{
    ASSERT(dev < THERMO_CNT);

    devs[dev].status &= ~THERMO_ACTIVE;
    thermo_hw_off(dev);
}


void thermo_clearErrors(ThermoDev dev)
{
    ASSERT(dev < THERMO_CNT);
    devs[dev].status &= ~(THERMO_ERRMASK);
}


deg_t thermo_readTemperature(ThermoDev dev)
{
    int i;
    long accum = 0;

    MOD_CHECK(thermo);

    for (i = 0; i < THERMO_HIFI_NUM_SAMPLES; i++)
        accum += devs[dev].hifi_samples[i];

    return (deg_t)(accum / THERMO_HIFI_NUM_SAMPLES);
}

MOD_DEFINE(thermo)


void thermo_init(void)
{
    THERMO_HW_INIT;

    /* Set all status to off */
    for (int i = 0; i < THERMO_CNT; i++)
        devs[i].status = THERMO_OFF;

    MOD_INIT(thermo);

    timer_setDelay(&thermo_timer, ms_to_ticks(THERMO_INTERVAL_MS));
    timer_set_event_softint(&thermo_timer, (Hook)thermo_softint, 0);
    timer_add(&thermo_timer);
}