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67 lines
1.4 KiB
67 lines
1.4 KiB
/** @file led4.c
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@author M.P. Hayes
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@date 5 Oct 2010
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*/
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#include "system.h"
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#include "navswitch.h"
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#include "led.h"
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#include "pacer.h"
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/* Define polling rate in Hz. */
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#define LOOP_RATE 4000
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#define LED_RATE 40
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int main (void)
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{
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unsigned int duty[] = {0, 1, 2, 5, 10, 20, 50, 100};
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unsigned int duty_index = 3;
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unsigned int count = 0;
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unsigned int period = LOOP_RATE / LED_RATE;
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unsigned int offcount = period * duty[duty_index] / 100;
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system_init ();
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pacer_init (LOOP_RATE);
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led_init ();
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navswitch_init ();
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/* Paced loop. */
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while (1)
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{
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/* Wait for next tick. */
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pacer_wait ();
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/* There is no need to poll the switches so frequently but it
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keeps the code simpler. */
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navswitch_update ();
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if (navswitch_push_event_p (NAVSWITCH_SOUTH))
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{
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if (duty_index > 0)
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duty_index--;
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offcount = (period * duty[duty_index] + 50) / 100;
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}
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if (navswitch_push_event_p (NAVSWITCH_NORTH))
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{
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duty_index++;
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if (duty_index >= ARRAY_SIZE (duty))
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duty_index = ARRAY_SIZE (duty) - 1;
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offcount = (period * duty[duty_index] + 50) / 100;
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}
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led_set (LED1, count < offcount);
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count++;
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if (count >= period)
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count = 0;
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}
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return 0;
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}
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