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29 * Copyright 2005 Develer S.r.l. (http://www.develer.com/)
34 * \brief Phase control driver (implementation)
37 * \author Francesco Sacchi <batt@develer.com>
40 #include <drv/timer.h>
43 #include <cfg/macros.h>
45 #include <cpu/types.h>
46 #include <cfg/compiler.h>
50 #include <drv/phase.h>
54 /** Array of triacs */
55 static Triac triacs[TRIAC_CNT];
57 DB(bool phase_initialized;)
60 * Zerocross interrupt, call when 220V cross zero.
62 * This function turn off all triacs that have duty < 100%
63 * and arm the triac timers for phase control.
64 * This function is frequency adaptive so can work both at 50 or 60Hz.
66 DEFINE_ZEROCROSS_ISR()
69 static ticks_t prev_time;
72 now = timer_clock_unlocked();
73 period = now - prev_time;
75 for (dev = 0; dev < TRIAC_CNT; dev++)
77 /* Only turn off triac if duty is != 100% */
78 if (triacs[dev].duty != TRIAC_MAX_DUTY)
80 /* Compute delay from duty */
81 timer_setDelay(&triacs[dev].timer, DIV_ROUND(period * (TRIAC_MAX_DUTY - triacs[dev].duty), TRIAC_MAX_DUTY));
83 /* This check avoids inserting the same timer twice
84 * in case of an intempestive zerocross or spike */
85 if (triacs[dev].running)
87 timer_abort(&triacs[dev].timer);
88 //kprintf("[%lu]\n", timer_clock());
91 triacs[dev].running = true;
92 timer_add(&triacs[dev].timer);
100 * Set duty of the triac channel \a dev (interrupt safe).
102 void phase_setDuty(TriacDev dev, triac_duty_t duty)
105 IRQ_SAVE_DISABLE(flags);
107 phase_setDutyUnlock(dev,duty);
115 * Set duty of the triac channel \a dev (NOT INTERRUPT SAFE).
117 void phase_setDutyUnlock(TriacDev dev, triac_duty_t duty)
119 triacs[dev].duty = MIN(duty, (triac_duty_t)TRIAC_MAX_DUTY);
125 * Set power of the triac channel \a dev (interrupt safe).
127 * This function approsimate the sine wave to a triangular wave to compute
130 void phase_setPower(TriacDev dev, triac_power_t power)
132 bool greater_fifty = false;
135 power = MIN(power, (triac_power_t)TRIAC_MAX_POWER);
137 if (power > TRIAC_MAX_POWER / 2)
139 greater_fifty = true;
140 power = TRIAC_MAX_POWER - power;
143 duty = TRIAC_POWER_K * sqrt(power);
146 duty = TRIAC_MAX_DUTY - duty;
147 phase_setDuty(dev, duty);
153 * Soft int for each \a _dev triac.
155 * The triacs are turned on at different time to achieve phase control.
157 static void phase_softint(void *_dev)
159 TriacDev dev = (TriacDev)_dev;
161 /* Only turn on if duty is !=0 */
162 if (triacs[dev].duty)
164 triacs[dev].running = false;
170 * Initialize phase control driver
172 void phase_init(void)
177 /* Init timers and ensure that all triac are off */
178 for (dev = 0; dev < TRIAC_CNT; dev++)
180 triacs[dev].duty = 0;
181 triacs[dev].running = false;
184 timer_set_event_softint(&triacs[dev].timer, (Hook)phase_softint, (void *)dev);
186 IRQ_SAVE_DISABLE(flags);
188 /* Init zero cross interrupt */
190 DB(phase_initialized = true;)