buzzerled_dsp56k.h

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/*#*
 *#* $Log$
 *#* Revision 1.7  2006/07/19 12:56:25  bernie
 *#* Convert to new Doxygen style.
 *#*
 *#* Revision 1.6  2005/11/04 16:20:02  bernie
 *#* Fix reference to README.devlib in header.
 *#*
 *#* Revision 1.5  2005/04/11 19:10:27  bernie
 *#* Include top-level headers from cfg/ subdir.
 *#*
 *#* Revision 1.4  2004/11/16 21:54:43  bernie
 *#* Changes for SC Monoboard support.
 *#*
 *#* Revision 1.3  2004/08/25 14:12:08  rasky
 *#* Aggiornato il comment block dei log RCS
 *#*
 *#* Revision 1.2  2004/06/03 11:27:09  bernie
 *#* Add dual-license information.
 *#*
 *#* Revision 1.1  2004/05/23 18:36:05  bernie
 *#* Import buzzerled driver.
 *#*
 *#*/

#ifndef DRV_BUZZERLED_DSP56K_H
#define DRV_BUZZERLED_DSP56K_H

#include <cfg/compiler.h>
#include <hw.h>
#include "pwm.h"

#if ARCH & ARCH_HECO

INLINE bool bld_is_inverted_intensity(enum BLD_DEVICE device)
{
    return (device == BLD_GREEN_LED
            || device == BLD_YELLOW_LED
            || device == BLD_RED_LED);
}

INLINE bool bld_is_pwm(enum BLD_DEVICE device)
{
    // Only the buzzer is connected to a PWM
    return (device == BLD_BUZZER || device == BLD_READY_LED);
}

INLINE bool bld_is_timer(enum BLD_DEVICE device)
{
    // LEDs are connected to timers
    return (device == BLD_GREEN_LED || device == BLD_YELLOW_LED || device == BLD_RED_LED);
}

INLINE uint16_t bld_get_pwm(enum BLD_DEVICE device)
{
    switch (device)
    {
    default: ASSERT(0);
    case BLD_BUZZER: return 5;  // PWMA5
    case BLD_READY_LED:  return 9;   // PWMB3
    }
}


INLINE struct REG_TIMER_STRUCT* bld_get_timer(enum BLD_DEVICE device)
{
    switch (device)
    {
    default: ASSERT(0);
    case BLD_GREEN_LED: return &REG_TIMER_B[2];
    case BLD_RED_LED: return &REG_TIMER_B[1];
    case BLD_YELLOW_LED: return &REG_TIMER_B[3];
    }
}

INLINE void bld_hw_init(void)
{
}

INLINE void bld_hw_set(enum BLD_DEVICE device, bool enable)
{
    if (bld_is_inverted_intensity(device))
        enable = !enable;

    // Handle a BLD connected to a PWM
    if (bld_is_pwm(device))
    {
        struct PWM* pwm = pwm_get_handle(bld_get_pwm(device));

        pwm_set_enable(pwm, false);
        pwm_set_dutycycle_percent(pwm, (enable ? 50 : 0));
        pwm_set_enable(pwm, true);
    }
    else if (bld_is_timer(device))
    {
        struct REG_TIMER_STRUCT* timer = bld_get_timer(device);

        // Check that the timer is currently stopped, and the OFLAG is not
        //  controlled by another timer. Otherwise, the led is already 
        //  controlled by the timer, and we cannot correctly set it 
        //  on/off without reprogramming the timer.
        ASSERT((timer->CTRL & REG_TIMER_CTRL_MODE_MASK) == REG_TIMER_CTRL_MODE_STOP);
        ASSERT(!(timer->SCR & REG_TIMER_SCR_EEOF));

        // Check also that polarity is correct
        ASSERT(!(timer->SCR & REG_TIMER_SCR_OPS));

        // Without programming the timer, we have a way to manually force a certain
        //  value on the external pin. We also need to enable the output pin.
        timer->SCR &= ~REG_TIMER_SCR_VAL_1;
        timer->SCR |= REG_TIMER_SCR_OEN |
                      REG_TIMER_SCR_FORCE |
                      (!enable ? REG_TIMER_SCR_VAL_0 : REG_TIMER_SCR_VAL_1);
    }
    else
        ASSERT(0);
}

#elif ARCH & ARCH_SC

// We do not need inline functions here, because constant propagation is not big deal here
void bld_hw_init(void);
void bld_hw_set(enum BLD_DEVICE device, bool enable);

#endif

#endif /* DRV_BUZZERLED_DSP56K_H */