59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
#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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#include <AT91SAM7S64.h>
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#include <sys-interrupt.h>
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static volatile clock_time_t current_clock = 0;
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#define PIV ((MCK/CLOCK_SECOND/16)-1)
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static int pit_handler_func()
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{
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if (!(*AT91C_PITC_PISR & AT91C_PITC_PITS)) return 0; /* Check PIT
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Interrupt */
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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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/* dbg_printf("%d,%d\n", clock_time(),etimer_next_expiration_time ()); */
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}
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(void)*AT91C_PITC_PIVR;
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return 1;
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}
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static SystemInterruptHandler pit_handler = {NULL, pit_handler_func};
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void
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clock_init()
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{
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sys_interrupt_append_handler(&pit_handler);
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*AT91C_PITC_PIMR = (AT91C_PITC_PITIEN | /* PIT Interrupt Enable */
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AT91C_PITC_PITEN | /* PIT Enable */
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PIV);
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sys_interrupt_enable();
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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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/* 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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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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