mirror of
https://github.com/qmk/qmk_firmware.git
synced 2025-06-04 15:32:45 +00:00
0ce2950d81
Fixed calculation of timer register reload values derived from F_CPU; must subtract one from the division result for the compare value to be correct. Change AVRISP-MKII rescue clock speed to 4MHz to ensure that a 125KHz ISP speed works regardless of the target's fuses (i.e. DIV8 set).
40 lines
589 B
C
40 lines
589 B
C
#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <avr/interrupt.h>
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#include <avr/io.h>
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#include <avr/sfr_defs.h>
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#include "clock.h"
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//Counted time
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volatile clock_time_t clock_datetime = 0;
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//Overflow interrupt
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ISR(TIMER1_COMPA_vect)
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{
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clock_datetime += 1;
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}
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//Initialise the clock
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void clock_init()
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{
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OCR1A = (((F_CPU / 1024) / 100) - 1);
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TCCR1B = ((1 << WGM12) | (1 << CS12) | (1 << CS10));
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TIMSK1 = (1 << OCIE1A);
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}
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//Return time
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clock_time_t clock_time()
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{
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clock_time_t time;
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ATOMIC_BLOCK(ATOMIC_FORCEON)
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{
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time = clock_datetime;
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}
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return time;
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}
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