4 * This file is part of BeRTOS.
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29 * Copyright 2005 Develer S.r.l. (http://www.develer.com/)
32 * \brief Phase control driver (implementation)
36 * \author Francesco Sacchi <batt@develer.com>
42 #include <cfg/macros.h>
43 #include <cfg/compiler.h>
46 #include <cpu/types.h>
48 #include <drv/timer.h>
49 #include <drv/phase.h>
53 #warning FIXME:Generalize this moduele for all target supported.
55 /** Array of triacs */
56 static Triac triacs[TRIAC_CNT];
58 DB(bool phase_initialized;)
61 * Zerocross interrupt, call when 220V cross zero.
63 * This function turn off all triacs that have duty < 100%
64 * and arm the triac timers for phase control.
65 * This function is frequency adaptive so can work both at 50 or 60Hz.
67 DEFINE_ZEROCROSS_ISR()
70 static ticks_t prev_time;
73 now = timer_clock_unlocked();
74 period = now - prev_time;
76 for (dev = 0; dev < TRIAC_CNT; dev++)
78 /* Only turn off triac if duty is != 100% */
79 if (triacs[dev].duty != TRIAC_MAX_DUTY)
81 /* Compute delay from duty */
82 timer_setDelay(&triacs[dev].timer, DIV_ROUND(period * (TRIAC_MAX_DUTY - triacs[dev].duty), TRIAC_MAX_DUTY));
84 /* This check avoids inserting the same timer twice
85 * in case of an intempestive zerocross or spike */
86 if (triacs[dev].running)
88 timer_abort(&triacs[dev].timer);
89 //kprintf("[%lu]\n", timer_clock());
92 triacs[dev].running = true;
93 timer_add(&triacs[dev].timer);
101 * Set duty of the triac channel \a dev (interrupt safe).
103 void phase_setDuty(TriacDev dev, triac_duty_t duty)
106 IRQ_SAVE_DISABLE(flags);
108 phase_setDutyUnlock(dev,duty);
116 * Set duty of the triac channel \a dev (NOT INTERRUPT SAFE).
118 void phase_setDutyUnlock(TriacDev dev, triac_duty_t duty)
120 triacs[dev].duty = MIN(duty, (triac_duty_t)TRIAC_MAX_DUTY);
126 * Set power of the triac channel \a dev (interrupt safe).
128 * This function approsimate the sine wave to a triangular wave to compute
131 void phase_setPower(TriacDev dev, triac_power_t power)
133 bool greater_fifty = false;
136 power = MIN(power, (triac_power_t)TRIAC_MAX_POWER);
138 if (power > TRIAC_MAX_POWER / 2)
140 greater_fifty = true;
141 power = TRIAC_MAX_POWER - power;
144 duty = TRIAC_POWER_K * sqrt(power);
147 duty = TRIAC_MAX_DUTY - duty;
148 phase_setDuty(dev, duty);
154 * Soft int for each \a _dev triac.
156 * The triacs are turned on at different time to achieve phase control.
158 static void phase_softint(void *_dev)
160 TriacDev dev = (TriacDev)_dev;
162 /* Only turn on if duty is !=0 */
163 if (triacs[dev].duty)
165 triacs[dev].running = false;
171 * Initialize phase control driver
173 void phase_init(void)
178 /* Init timers and ensure that all triac are off */
179 for (dev = 0; dev < TRIAC_CNT; dev++)
181 triacs[dev].duty = 0;
182 triacs[dev].running = false;
185 timer_set_event_softint(&triacs[dev].timer, (Hook)phase_softint, (void *)dev);
187 IRQ_SAVE_DISABLE(flags);
189 /* Init zero cross interrupt */
191 DB(phase_initialized = true;)