#include "cmdline.h"
#include "main.h"
+/* beacon identifier: must be odd, 3 bits */
+#define BEACON_ID_MASK 0x7
+#define BEACON_ID_SHIFT 0
+#define FRAME_DATA_MASK 0xFFF8
+#define FRAME_DATA_SHIFT 3
+
/******************* TSOP */
#define EICRx_TSOP EICRB /* EICRA is not ok, cannot do intr on any edge */
#define ISCx0_TSOP ISC60
#define ISCx1_TSOP ISC61
#define SIG_TSOP SIG_INTERRUPT6
-#define TSOP_READ() (PINE & 0x40)
+#define TSOP_READ() (!(PINE & 0x40))
#else
#define INTx_TSOP INT4
#define ISCx0_TSOP ISC40
#define ISCx1_TSOP ISC41
#define SIG_TSOP SIG_INTERRUPT4
-#define TSOP_READ() (PINE & 0x10)
+#define TSOP_READ() (!(PINE & 0x10))
#endif
+//#define MODUL_455KHZ
+#define MODUL_38KHZ
+
+#if (defined MODUL_455KHZ)
#define TSOP_FREQ_MHZ 0.455
-#define TSOP_PERIOD_US (1./TSOP_FREQ_MHZ)
#define N_PERIODS 10.
+#else
+#define TSOP_FREQ_MHZ 0.038
+#define N_PERIODS 15.
+#endif
+
+#define TSOP_PERIOD_US (1./TSOP_FREQ_MHZ)
#define TSOP_TIME_SHORT_US (1.5 * N_PERIODS * TSOP_PERIOD_US)
#define TSOP_TIME_LONG_US (2.5 * N_PERIODS * TSOP_PERIOD_US)
#define TSOP_TIME_LONG ((uint16_t)(TSOP_TIME_LONG_US*2))
#define FRAME_LEN 16
+#define FRAME_MASK ((1UL << FRAME_LEN) - 1)
/* frame */
static uint16_t start_angle_time;
cur_tsop = TSOP_READ();
diff_time = cur_time - prev_time;
+ if (cur_tsop)
+ LED2_ON();
+ else
+ LED2_OFF();
+
/* first rising edge */
- if (cur_tsop && diff_time > TSOP_TIME_LONG) {
+ if (len == 0 && cur_tsop && diff_time > TSOP_TIME_LONG) {
len = 1;
val = 1;
frame = 0;
mask = 1;
}
/* any short edge */
- else if (diff_time < TSOP_TIME_SHORT) {
+ else if (len != 0 && diff_time < TSOP_TIME_SHORT) {
if (len & 1) {
if (val)
frame |= mask;
len ++;
}
/* any long edge */
- else if (diff_time < TSOP_TIME_LONG) {
+ else if (len != 0 && diff_time < TSOP_TIME_LONG) {
val = !val;
if (val)
frame |= mask;
mask <<= 1;
len += 2;
}
+ /* error case, reset */
+ else {
+ len = 0;
+ }
/* end of frame */
if (len == FRAME_LEN*2) {
uint8_t tail_next = (frame_ring_tail+1) & FRAME_RING_MASK;
if (tail_next != frame_ring_head) {
- frame_ring[frame_ring_tail].frame = frame;
+ frame_ring[frame_ring_tail].frame = (frame & FRAME_MASK);
frame_ring[frame_ring_tail].time = start_angle_time;
frame_ring_tail = tail_next;
}
- if (led_cpt & 0x8)
+ if ((led_cpt & 0x7) == 0)
LED3_TOGGLE();
led_cpt ++;
}
sei();
ETIFR = _BV(ICF3);
- LED2_TOGGLE();
+ //LED2_TOGGLE();
diff_icr = (icr - prev_icr);
cpt_icr = cpt;
prev_icr = icr;
/* after CS, check if we have a new frame in ring */
if (frame_ring_head != frame_ring_tail) {
uint8_t head_next;
+ uint32_t frame;
head_next = (frame_ring_head+1) & FRAME_RING_MASK;
- if (beacon_tsop.debug_frame)
- printf("%x %d\n", frame_ring[frame_ring_head].frame,
+ frame = frame_ring[frame_ring_head].frame;
+
+ /* display if needed */
+ if (beacon_tsop.debug_frame) {
+ uint8_t beacon_id;
+ uint16_t data;
+
+ beacon_id = (frame >> BEACON_ID_SHIFT) & BEACON_ID_MASK;
+ data = (frame >> FRAME_DATA_SHIFT) & FRAME_DATA_MASK;
+ printf("ID=%d data=%d time=%d\r\n",
+ beacon_id, data,
frame_ring[frame_ring_head].time);
+ }
frame_ring_head = head_next;
}