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)
35 * \author Francesco Sacchi <batt@develer.com>
39 #include "hw/hw_phase.h"
41 #include <cfg/macros.h>
42 #include <cfg/compiler.h>
45 #include <cpu/types.h>
47 #include <drv/timer.h>
48 #include <drv/phase.h>
52 /** Array of triacs */
53 static Triac triacs[TRIAC_CNT];
55 DB(bool phase_initialized;)
58 * Zerocross interrupt, call when 220V cross zero.
60 * This function turn off all triacs that have duty < 100%
61 * and arm the triac timers for phase control.
62 * This function is frequency adaptive so can work both at 50 or 60Hz.
64 DEFINE_ZEROCROSS_ISR()
67 static ticks_t prev_time;
70 now = timer_clock_unlocked();
71 period = now - prev_time;
73 for (dev = 0; dev < TRIAC_CNT; dev++)
75 /* Only turn off triac if duty is != 100% */
76 if (triacs[dev].duty != CONFIG_TRIAC_MAX_DUTY)
78 /* Compute delay from duty */
79 timer_setDelay(&triacs[dev].timer, DIV_ROUND(period * (CONFIG_TRIAC_MAX_DUTY - triacs[dev].duty), CONFIG_TRIAC_MAX_DUTY));
81 /* This check avoids inserting the same timer twice
82 * in case of an intempestive zerocross or spike */
83 if (triacs[dev].running)
85 timer_abort(&triacs[dev].timer);
86 //kprintf("[%lu]\n", timer_clock());
89 triacs[dev].running = true;
90 timer_add(&triacs[dev].timer);
98 * Set duty of the triac channel \a dev (interrupt safe).
100 void phase_setDuty(TriacDev dev, triac_duty_t duty)
103 IRQ_SAVE_DISABLE(flags);
105 phase_setDutyUnlock(dev,duty);
113 * Set duty of the triac channel \a dev (NOT INTERRUPT SAFE).
115 void phase_setDutyUnlock(TriacDev dev, triac_duty_t duty)
117 triacs[dev].duty = MIN(duty, (triac_duty_t)CONFIG_TRIAC_MAX_DUTY);
123 * Set power of the triac channel \a dev (interrupt safe).
125 * This function approsimate the sine wave to a triangular wave to compute
128 void phase_setPower(TriacDev dev, triac_power_t power)
130 bool greater_fifty = false;
133 power = MIN(power, (triac_power_t)CONFIG_TRIAC_MAX_POWER);
135 if (power > CONFIG_TRIAC_MAX_POWER / 2)
137 greater_fifty = true;
138 power = CONFIG_TRIAC_MAX_POWER - power;
141 duty = TRIAC_POWER_K * sqrt(power);
144 duty = CONFIG_TRIAC_MAX_DUTY - duty;
145 phase_setDuty(dev, duty);
151 * Soft int for each \a _dev triac.
153 * The triacs are turned on at different time to achieve phase control.
155 static void phase_softint(void *_dev)
157 TriacDev dev = (TriacDev)_dev;
159 /* Only turn on if duty is !=0 */
160 if (triacs[dev].duty)
162 triacs[dev].running = false;
168 * Initialize phase control driver
170 void phase_init(void)
175 /* Init timers and ensure that all triac are off */
176 for (dev = 0; dev < TRIAC_CNT; dev++)
178 triacs[dev].duty = 0;
179 triacs[dev].running = false;
182 timer_setSoftint(&triacs[dev].timer, (Hook)phase_softint, (void *)dev);
184 IRQ_SAVE_DISABLE(flags);
186 /* Init zero cross interrupt */
188 DB(phase_initialized = true;)