79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
// Commands for controlling hardware based pulse-width-modulator pins
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//
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// Copyright (C) 2016 Kevin O'Connor <kevin@koconnor.net>
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//
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// This file may be distributed under the terms of the GNU GPLv3 license.
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#include "basecmd.h" // oid_alloc
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#include "board/gpio.h" // struct gpio_pwm
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#include "command.h" // DECL_COMMAND
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#include "sched.h" // sched_add_timer
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struct pwm_out_s {
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struct timer timer;
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struct gpio_pwm pin;
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uint32_t max_duration;
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uint8_t value, default_value;
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};
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static uint8_t
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pwm_end_event(struct timer *timer)
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{
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shutdown("Missed scheduling of next hard pwm event");
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}
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static uint8_t
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pwm_event(struct timer *timer)
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{
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struct pwm_out_s *p = container_of(timer, struct pwm_out_s, timer);
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gpio_pwm_write(p->pin, p->value);
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if (p->value == p->default_value || !p->max_duration)
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return SF_DONE;
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p->timer.waketime += p->max_duration;
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p->timer.func = pwm_end_event;
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return SF_RESCHEDULE;
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}
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void
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command_config_pwm_out(uint32_t *args)
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{
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struct pwm_out_s *p = oid_alloc(args[0], command_config_pwm_out, sizeof(*p));
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p->default_value = args[3];
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p->pin = gpio_pwm_setup(args[1], args[2], p->default_value);
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p->max_duration = args[4];
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}
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DECL_COMMAND(command_config_pwm_out,
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"config_pwm_out oid=%c pin=%u cycle_ticks=%u default_value=%c"
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" max_duration=%u");
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void
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command_schedule_pwm_out(uint32_t *args)
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{
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struct pwm_out_s *p = oid_lookup(args[0], command_config_pwm_out);
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sched_del_timer(&p->timer);
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p->timer.func = pwm_event;
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p->timer.waketime = args[1];
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p->value = args[2];
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sched_add_timer(&p->timer);
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}
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DECL_COMMAND(command_schedule_pwm_out,
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"schedule_pwm_out oid=%c clock=%u value=%c");
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static void
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pwm_shutdown(void)
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{
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uint8_t i;
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struct pwm_out_s *p;
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foreach_oid(i, p, command_config_pwm_out) {
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gpio_pwm_write(p->pin, p->default_value);
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}
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}
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DECL_SHUTDOWN(pwm_shutdown);
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void
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command_set_pwm_out(uint32_t *args)
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{
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gpio_pwm_setup(args[0], args[1], args[2]);
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}
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DECL_COMMAND(command_set_pwm_out, "set_pwm_out pin=%u cycle_ticks=%u value=%c");
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