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29 * @(#)$Id: cc2420-arch-sfd.c,v 1.3 2010/01/26 10:20:16 adamdunkels Exp $
36 #include "dev/cc2420.h"
38 volatile uint8_t cc2420_arch_sfd_counter
;
39 volatile uint16_t cc2420_arch_sfd_start_time
;
40 volatile uint16_t cc2420_arch_sfd_end_time
;
42 /*---------------------------------------------------------------------------*/
43 /* SFD interrupt for timestamping radio packets */
44 interrupt(TIMERB1_VECTOR
)
45 cc24240_timerb1_interrupt(void)
48 ENERGEST_ON(ENERGEST_TYPE_IRQ
);
49 /* always read TBIV to clear IFG */
52 cc2420_arch_sfd_counter
++;
53 cc2420_arch_sfd_start_time
= TBCCR1
;
55 cc2420_arch_sfd_counter
= 0;
56 cc2420_arch_sfd_end_time
= TBCCR1
;
58 ENERGEST_OFF(ENERGEST_TYPE_IRQ
);
60 /*---------------------------------------------------------------------------*/
62 cc2420_arch_sfd_init(void)
64 /* Need to select the special function! */
67 /* start timer B - 32768 ticks per second */
68 TBCTL
= TBSSEL_1
| TBCLR
;
70 /* CM_3 = capture mode - capture on both edges */
71 TBCCTL1
= CM_3
| CAP
| SCS
;
74 /* Start Timer_B in continuous mode. */
77 /*---------------------------------------------------------------------------*/