TEST10.C
资源名称:ertos.rar [点击查看]
上传用户:sunrenlu
上传日期:2022-06-13
资源大小:1419k
文件大小:1k
源码类别:
操作系统开发
开发平台:
DOS
- /**************************************************************************/
- /* TEST10 - show time impact of changing PC timer frequency */
- /**************************************************************************/
- #include <stdio.h>
- #include <rtos.h>
- void beep( void )
- {
- int i ;
- for ( i = 0 ; i < 10 ; ++i ) {
- sound( 100 );
- rt_sleep( 100 );
- nosound();
- rt_sleep( 100 );
- }
- }
- void try_freq( int freq )
- {
- printf("trying frequency : %un", freq );
- rt_timerfreq( freq );
- beep();
- }
- int main(int argc, char **argv)
- {
- rt_init(100);
- puts("At low timer resolutions, a delay of 100ms will be approximate");
- puts("but it becomes increasingly accurate as we bump up the clock,");
- puts("the accuracy depends on the LCD or lowest common denominator");
- puts("of the clock rate and the beep rate.");
- puts("This example works in 16 bit eRTOS only, not 32 bit");
- try_freq( 18 );
- try_freq( 20 );
- try_freq( 30 );
- try_freq( 50 );
- try_freq( 100 );
- try_freq( 500 );
- try_freq( 1000 );
- try_freq( 10000 );
- }