71 lines
1.4 KiB
C
71 lines
1.4 KiB
C
#include <stm32f10x_map.h>
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#include <nvic.h>
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#include <sys/clock.h>
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#include <sys/cc.h>
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#include <sys/etimer.h>
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#include <debug-uart.h>
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static volatile clock_time_t current_clock = 0;
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static volatile unsigned long current_seconds = 0;
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static unsigned int second_countdown = CLOCK_SECOND;
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void
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SysTick_handler(void) __attribute__ ((interrupt));
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void
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SysTick_handler(void)
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{
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(void)SysTick->CTRL;
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SCB->ICSR = SCB_ICSR_PENDSTCLR;
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current_clock++;
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if(etimer_pending() && etimer_next_expiration_time() <= current_clock) {
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etimer_request_poll();
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/* printf("%d,%d\n", clock_time(),etimer_next_expiration_time ()); */
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}
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if (--second_countdown == 0) {
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current_seconds++;
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second_countdown = CLOCK_SECOND;
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}
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}
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void
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clock_init()
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{
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NVIC_SET_SYSTICK_PRI(8);
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SysTick->LOAD = MCK/8/CLOCK_SECOND;
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SysTick->CTRL = SysTick_CTRL_ENABLE | SysTick_CTRL_TICKINT;
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}
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clock_time_t
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clock_time(void)
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{
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return current_clock;
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}
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#if 0
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/* The inner loop takes 4 cycles. The outer 5+SPIN_COUNT*4. */
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#define SPIN_TIME 2 /* us */
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#define SPIN_COUNT (((MCK*SPIN_TIME/1000000)-5)/4)
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#ifndef __MAKING_DEPS__
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void
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clock_delay(unsigned int t)
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{
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#ifdef __THUMBEL__
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asm volatile("1: mov r1,%2\n2:\tsub r1,#1\n\tbne 2b\n\tsub %0,#1\n\tbne 1b\n":"=l"(t):"0"(t),"l"(SPIN_COUNT));
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#else
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#error Must be compiled in thumb mode
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#endif
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}
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#endif
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#endif /* __MAKING_DEPS__ */
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unsigned long
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clock_seconds(void)
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{
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return current_seconds;
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}
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