qmk_firmware/tmk_core/common/mbed/timer.c

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#include "cmsis.h"
#include "timer.h"
/* Mill second tick count */
volatile uint32_t timer_count = 0;
/* Timer interrupt handler */
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void SysTick_Handler(void) { timer_count++; }
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void timer_init(void) {
timer_count = 0;
SysTick_Config(SystemCoreClock / 1000); /* 1ms tick */
}
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void timer_clear(void) { timer_count = 0; }
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uint16_t timer_read(void) { return (uint16_t)(timer_count & 0xFFFF); }
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uint32_t timer_read32(void) { return timer_count; }
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uint16_t timer_elapsed(uint16_t last) { return TIMER_DIFF_16(timer_read(), last); }
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uint32_t timer_elapsed32(uint32_t last) { return TIMER_DIFF_32(timer_read32(), last); }