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67 lines
1.3 KiB
67 lines
1.3 KiB
/** @file random2.c
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@author M.P. Hayes
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@date 25 Sep 2013
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@brief Example to show how pseudorandom sequence can be changed by reseeding
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the pseudorandom number generator.
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*/
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#include <stdlib.h>
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#include "system.h"
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#include "pacer.h"
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#include "tinygl.h"
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#include "navswitch.h"
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#include "../fonts/font5x7_1.h"
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#define LOOP_RATE 10000
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#define NAVSWITCH_RATE 20
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int main (void)
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{
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uint16_t navswitch_tick = 0;
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uint16_t count = 0;
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system_init ();
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navswitch_init ();
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tinygl_init (LOOP_RATE);
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tinygl_font_set (&font5x7_1);
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pacer_init (LOOP_RATE);
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tinygl_draw_char ('*', tinygl_point (0, 0));
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while (1)
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{
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pacer_wait ();
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tinygl_update ();
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count++;
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navswitch_tick++;
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if (navswitch_tick >= LOOP_RATE / NAVSWITCH_RATE)
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{
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navswitch_tick = 0;
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navswitch_update ();
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if (navswitch_push_event_p (NAVSWITCH_PUSH))
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{
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char c;
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c = (rand () % 26) + 'A';
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tinygl_draw_char (c, tinygl_point (0, 0));
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/* Reseed the pseudorandom number generator based on the
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number of iterations of the paced loop. */
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srand (count);
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}
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}
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}
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return 0;
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}
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