ao_radio_recv(__xdata struct ao_radio_recv *recv) __reentrant;
void
-ao_radio_rdf(void);
+ao_radio_rdf(int ms);
void
ao_radio_rdf_abort(void);
/* slow down the ADC sample rate */
ao_timer_set_adc_interval(10);
- /* Enable RDF beacon */
- ao_rdf_set(1);
-
/*
* Start recording min/max accel and pres for a while
* to figure out when the rocket has landed
/* turn off the ADC capture */
ao_timer_set_adc_interval(0);
+ /* Enable RDF beacon */
+ ao_rdf_set(1);
ao_wakeup(DATA_TO_XDATA(&ao_flight_state));
}
(RDF_DEVIATION_M << RF_DEVIATN_DEVIATION_M_SHIFT)),
/* packet length */
- RF_PKTLEN_OFF, RDF_PACKET_LEN,
RF_PKTCTRL1_OFF, ((1 << PKTCTRL1_PQT_SHIFT)|
PKTCTRL1_ADR_CHK_NONE),
RF_PKTCTRL0_OFF, (RF_PKTCTRL0_PKT_FORMAT_NORMAL|
__xdata ao_radio_rdf_value = 0x55;
void
-ao_radio_rdf(void)
+ao_radio_rdf(int ms)
{
uint8_t i;
+ uint8_t pkt_len;
ao_mutex_get(&ao_radio_mutex);
ao_radio_idle();
ao_radio_rdf_running = 1;
for (i = 0; i < sizeof (rdf_setup); i += 2)
RF[rdf_setup[i]] = rdf_setup[i+1];
+ /*
+ * Compute the packet length as follows:
+ *
+ * 2000 bps (for a 1kHz tone)
+ * so, for 'ms' milliseconds, we need
+ * 2 * ms bits, or ms / 4 bytes
+ */
+ if (ms > (255 * 4))
+ ms = 255 * 4;
+ pkt_len = ms >> 2;
+ RF[RF_PKTLEN_OFF] = pkt_len;
+
ao_dma_set_transfer(ao_radio_dma,
&ao_radio_rdf_value,
&RFDXADDR,
- RDF_PACKET_LEN,
+ pkt_len,
DMA_CFG0_WORDSIZE_8 |
DMA_CFG0_TMODE_SINGLE |
DMA_CFG0_TRIGGER_RADIO,
__xdata uint8_t ao_rdf = 0;
__xdata uint16_t ao_rdf_time;
-#define AO_RDF_INTERVAL AO_SEC_TO_TICKS(3)
+#define AO_RDF_INTERVAL_TICKS AO_SEC_TO_TICKS(5)
+#define AO_RDF_LENGTH_MS 500
void
ao_telemetry(void)
if (ao_rdf &&
(int16_t) (ao_time() - ao_rdf_time) >= 0)
{
- ao_rdf_time = ao_time() + AO_RDF_INTERVAL;
- ao_radio_rdf();
+ ao_rdf_time = ao_time() + AO_RDF_INTERVAL_TICKS;
+ ao_radio_rdf(AO_RDF_LENGTH_MS);
ao_delay(ao_telemetry_interval);
}
}
ao_rdf = rdf;
if (rdf == 0)
ao_radio_rdf_abort();
+ else
+ ao_rdf_time = ao_time();
}
__xdata struct ao_task ao_telemetry_task;