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21 lines
446 B
C
21 lines
446 B
C
#include "timer.h"
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#include "AT91SAM7S256.h"
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// this is a 32 bit counter which overflows after 2^32 milliseconds
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// -> after 46 days
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void timer_init() {
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// reprogram the realtime timer to run at 1Khz
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AT91C_BASE_RTTC->RTTC_RTMR = 0x8000 / 1000;
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}
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msec_t timer_get_msec() {
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return AT91C_BASE_RTTC->RTTC_RTVR;
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}
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void timer_delay_msec(msec_t t) {
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msec_t now = AT91C_BASE_RTTC->RTTC_RTVR;
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while(AT91C_BASE_RTTC->RTTC_RTVR - now < t);
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}
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