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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 /** Array of triacs */
54 static Triac triacs[TRIAC_CNT];
56 DB(bool phase_initialized;)
59 * Zerocross interrupt, call when 220V cross zero.
61 * This function turn off all triacs that have duty < 100%
62 * and arm the triac timers for phase control.
63 * This function is frequency adaptive so can work both at 50 or 60Hz.
65 DEFINE_ZEROCROSS_ISR()
68 static ticks_t prev_time;
71 now = timer_clock_unlocked();
72 period = now - prev_time;
74 for (dev = 0; dev < TRIAC_CNT; dev++)
76 /* Only turn off triac if duty is != 100% */
77 if (triacs[dev].duty != CONFIG_TRIAC_MAX_DUTY)
79 /* Compute delay from duty */
80 timer_setDelay(&triacs[dev].timer, DIV_ROUND(period * (CONFIG_TRIAC_MAX_DUTY - triacs[dev].duty), CONFIG_TRIAC_MAX_DUTY));
82 /* This check avoids inserting the same timer twice
83 * in case of an intempestive zerocross or spike */
84 if (triacs[dev].running)
86 timer_abort(&triacs[dev].timer);
87 //kprintf("[%lu]\n", timer_clock());
90 triacs[dev].running = true;
91 timer_add(&triacs[dev].timer);
99 * Set duty of the triac channel \a dev (interrupt safe).
101 void phase_setDuty(TriacDev dev, triac_duty_t duty)
104 IRQ_SAVE_DISABLE(flags);
106 phase_setDutyUnlock(dev,duty);
114 * Set duty of the triac channel \a dev (NOT INTERRUPT SAFE).
116 void phase_setDutyUnlock(TriacDev dev, triac_duty_t duty)
118 triacs[dev].duty = MIN(duty, (triac_duty_t)CONFIG_TRIAC_MAX_DUTY);
124 * Set power of the triac channel \a dev (interrupt safe).
126 * This function approsimate the sine wave to a triangular wave to compute
129 void phase_setPower(TriacDev dev, triac_power_t power)
131 bool greater_fifty = false;
134 power = MIN(power, (triac_power_t)CONFIG_TRIAC_MAX_POWER);
136 if (power > CONFIG_TRIAC_MAX_POWER / 2)
138 greater_fifty = true;
139 power = CONFIG_TRIAC_MAX_POWER - power;
142 duty = TRIAC_POWER_K * sqrt(power);
145 duty = CONFIG_TRIAC_MAX_DUTY - duty;
146 phase_setDuty(dev, duty);
152 * Soft int for each \a _dev triac.
154 * The triacs are turned on at different time to achieve phase control.
156 static void phase_softint(void *_dev)
158 TriacDev dev = (TriacDev)_dev;
160 /* Only turn on if duty is !=0 */
161 if (triacs[dev].duty)
163 triacs[dev].running = false;
169 * Initialize phase control driver
171 void phase_init(void)
176 /* Init timers and ensure that all triac are off */
177 for (dev = 0; dev < TRIAC_CNT; dev++)
179 triacs[dev].duty = 0;
180 triacs[dev].running = false;
183 timer_setSoftint(&triacs[dev].timer, (Hook)phase_softint, (void *)dev);
185 IRQ_SAVE_DISABLE(flags);
187 /* Init zero cross interrupt */
189 DB(phase_initialized = true;)