diff options
Diffstat (limited to 'src/ao_radio.c')
| -rw-r--r-- | src/ao_radio.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/src/ao_radio.c b/src/ao_radio.c index e4d42c6c..76fa3e5d 100644 --- a/src/ao_radio.c +++ b/src/ao_radio.c @@ -223,7 +223,6 @@ static __code uint8_t rdf_setup[] = { (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| @@ -324,19 +323,32 @@ __xdata ao_radio_rdf_running; __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, |