44 lines
774 B
C
44 lines
774 B
C
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#include <generated/csr.h>
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#include <time.h>
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void time_init(void)
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{
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int t;
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timer0_en_write(0);
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t = 2*SYSTEM_CLOCK_FREQUENCY;
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timer0_reload_write(t);
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timer0_load_write(t);
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timer0_en_write(1);
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}
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int elapsed(int *last_event, int period)
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{
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int t, dt;
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timer0_update_value_write(1);
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t = timer0_reload_read() - timer0_value_read();
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if(period < 0) {
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*last_event = t;
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return 1;
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}
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dt = t - *last_event;
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if(dt < 0)
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dt += timer0_reload_read();
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if((dt > period) || (dt < 0)) {
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*last_event = t;
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return 1;
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} else
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return 0;
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}
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void msleep(int ms)
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{
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timer0_en_write(0);
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timer0_reload_write(0);
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timer0_load_write(SYSTEM_CLOCK_FREQUENCY/1000*ms);
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timer0_en_write(1);
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timer0_update_value_write(1);
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while(timer0_value_read()) timer0_update_value_write(1);
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}
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