構文
unsigned long GetSystemTime(void);
パラメータ
なし
戻り値
現在のシステムタイマの値を20 msec単位で返します。
解説
ステムタイマはSetSystemTime関数で初期化可能です。必要条件
ヘッダファイル:
lib.hライブラリファイル:
libSTARTUPOPH5000.a
サンプル
#include <stdio.h>
#include "lib.h"
#define HIGH_DELAY 13 * 5 // Note that these are prime numbers
#define MEDIUM_DELAY 23 * 5
#define LOW_DELAY 37 * 5
void main( void )
{
unsigned long current_time;
unsigned long next_high_time;
unsigned long next_medium_time;
unsigned long next_low_time;
SetSystemTime(0); // Reset system timer to zero
next_high_time = HIGH_DELAY;
next_medium_time = MEDIUM_DELAY;
next_low_time = LOW_DELAY;
SetFont(SMALL_FONT, NULL);
printf("\f3 independent\ntimers using\nGetSystemTime");
while( 1 )
{
current_time = GetSystemTime();
if(current_time >= next_low_time)
{
Sound( TSTANDARD, VSTANDARD, SLOW, 0);
GoodReadLed(RED,TIME_100MS*2);
next_low_time += LOW_DELAY;
}
if(current_time >= next_medium_time)
{
Sound( TSTANDARD, VSTANDARD, SMEDIUM, 0);
GoodReadLed(ORANGE,TIME_100MS*2);
next_medium_time += MEDIUM_DELAY;
}
if(current_time >= next_high_time)
{
Sound( TSTANDARD, VSTANDARD, SHIGH, 0);
GoodReadLed(GREEN,TIME_100MS*2);
next_high_time += HIGH_DELAY;
}
Idle();
}
}
最終更新日：2020/10/08