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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>
40 #include "hw/hw_phase.h"
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 TODO:Generalize this moduele for all target supported.
56 /** Array of triacs */
57 static Triac triacs[TRIAC_CNT];
59 DB(bool phase_initialized;)
62 * Zerocross interrupt, call when 220V cross zero.
64 * This function turn off all triacs that have duty < 100%
65 * and arm the triac timers for phase control.
66 * This function is frequency adaptive so can work both at 50 or 60Hz.
68 DEFINE_ZEROCROSS_ISR()
71 static ticks_t prev_time;
74 now = timer_clock_unlocked();
75 period = now - prev_time;
77 for (dev = 0; dev < TRIAC_CNT; dev++)
79 /* Only turn off triac if duty is != 100% */
80 if (triacs[dev].duty != TRIAC_MAX_DUTY)
82 /* Compute delay from duty */
83 timer_setDelay(&triacs[dev].timer, DIV_ROUND(period * (TRIAC_MAX_DUTY - triacs[dev].duty), TRIAC_MAX_DUTY));
85 /* This check avoids inserting the same timer twice
86 * in case of an intempestive zerocross or spike */
87 if (triacs[dev].running)
89 timer_abort(&triacs[dev].timer);
90 //kprintf("[%lu]\n", timer_clock());
93 triacs[dev].running = true;
94 timer_add(&triacs[dev].timer);
102 * Set duty of the triac channel \a dev (interrupt safe).
104 void phase_setDuty(TriacDev dev, triac_duty_t duty)
107 IRQ_SAVE_DISABLE(flags);
109 phase_setDutyUnlock(dev,duty);
117 * Set duty of the triac channel \a dev (NOT INTERRUPT SAFE).
119 void phase_setDutyUnlock(TriacDev dev, triac_duty_t duty)
121 triacs[dev].duty = MIN(duty, (triac_duty_t)TRIAC_MAX_DUTY);
127 * Set power of the triac channel \a dev (interrupt safe).
129 * This function approsimate the sine wave to a triangular wave to compute
132 void phase_setPower(TriacDev dev, triac_power_t power)
134 bool greater_fifty = false;
137 power = MIN(power, (triac_power_t)TRIAC_MAX_POWER);
139 if (power > TRIAC_MAX_POWER / 2)
141 greater_fifty = true;
142 power = TRIAC_MAX_POWER - power;
145 duty = TRIAC_POWER_K * sqrt(power);
148 duty = TRIAC_MAX_DUTY - duty;
149 phase_setDuty(dev, duty);
155 * Soft int for each \a _dev triac.
157 * The triacs are turned on at different time to achieve phase control.
159 static void phase_softint(void *_dev)
161 TriacDev dev = (TriacDev)_dev;
163 /* Only turn on if duty is !=0 */
164 if (triacs[dev].duty)
166 triacs[dev].running = false;
172 * Initialize phase control driver
174 void phase_init(void)
179 /* Init timers and ensure that all triac are off */
180 for (dev = 0; dev < TRIAC_CNT; dev++)
182 triacs[dev].duty = 0;
183 triacs[dev].running = false;
186 timer_set_event_softint(&triacs[dev].timer, (Hook)phase_softint, (void *)dev);
188 IRQ_SAVE_DISABLE(flags);
190 /* Init zero cross interrupt */
192 DB(phase_initialized = true;)