/*---------------------------------------------------------------------------*/
void
cc2420_set_pan_addr(unsigned pan,
unsigned addr,
const uint8_t *ieee_addr)
{
uint16_t f = 0;
uint8_t tmp[2];
GET_LOCK();
/*
* Writing RAM requires crystal oscillator to be stable.
*/
BUSYWAIT_UNTIL(status() & (BV(CC2420_XOSC16M_STABLE)), RTIMER_SECOND / 10);
tmp[0] = pan & 0xff;
tmp[1] = pan >> 8;
CC2420_WRITE_RAM(&tmp, CC2420RAM_PANID, 2);
tmp[0] = addr & 0xff;
tmp[1] = addr >> 8;
CC2420_WRITE_RAM(&tmp, CC2420RAM_SHORTADDR, 2);
if(ieee_addr != NULL) {
uint8_t tmp_addr[8];
/* LSB first, MSB last for 802.15.4 addresses in CC2420 */
for (f = 0; f < 8; f++) {
tmp_addr[7 - f] = ieee_addr[f];
}
CC2420_WRITE_RAM(tmp_addr, CC2420RAM_IEEEADDR, 8);
}
RELEASE_LOCK();
}
/* Encrypt at most 16 bytes of data. */
static void
cipher16(uint8_t *data, int len)
{
uint8_t status;
len = MIN(len, MAX_DATALEN);
CC2420_WRITE_RAM(data, CC2420RAM_SABUF, len);
CC2420_STROBE(CC2420_SAES);
/* Wait for the encryption to finish */
do {
CC2420_GET_STATUS(status);
} while(status & BV(CC2420_ENC_BUSY));
CC2420_READ_RAM(data, CC2420RAM_SABUF, len);
}
/*---------------------------------------------------------------------------*/
static int
cc2420_transmit(unsigned short payload_len)
{
int i, txpower;
uint8_t total_len;
#if CC2420_CONF_CHECKSUM
uint16_t checksum;
#endif /* CC2420_CONF_CHECKSUM */
GET_LOCK();
txpower = 0;
if(packetbuf_attr(PACKETBUF_ATTR_RADIO_TXPOWER) > 0) {
/* Remember the current transmission power */
txpower = cc2420_get_txpower();
/* Set the specified transmission power */
set_txpower(packetbuf_attr(PACKETBUF_ATTR_RADIO_TXPOWER) - 1);
}
total_len = payload_len + AUX_LEN;
/* The TX FIFO can only hold one packet. Make sure to not overrun
* FIFO by waiting for transmission to start here and synchronizing
* with the CC2420_TX_ACTIVE check in cc2420_send.
*
* Note that we may have to wait up to 320 us (20 symbols) before
* transmission starts.
*/
#ifndef CC2420_CONF_SYMBOL_LOOP_COUNT
#error CC2420_CONF_SYMBOL_LOOP_COUNT needs to be set!!!
#else
#define LOOP_20_SYMBOLS CC2420_CONF_SYMBOL_LOOP_COUNT
#endif
#if WITH_SEND_CCA
strobe(CC2420_SRXON);
BUSYWAIT_UNTIL(status() & BV(CC2420_RSSI_VALID), RTIMER_SECOND / 10);
strobe(CC2420_STXONCCA);
#else /* WITH_SEND_CCA */
strobe(CC2420_STXON);
#endif /* WITH_SEND_CCA */
for(i = LOOP_20_SYMBOLS; i > 0; i--) {
if(CC2420_SFD_IS_1) {
{
rtimer_clock_t sfd_timestamp;
sfd_timestamp = cc2420_sfd_start_time;
if(packetbuf_attr(PACKETBUF_ATTR_PACKET_TYPE) ==
PACKETBUF_ATTR_PACKET_TYPE_TIMESTAMP) {
/* Write timestamp to last two bytes of packet in TXFIFO. */
CC2420_WRITE_RAM(&sfd_timestamp, CC2420RAM_TXFIFO + payload_len - 1, 2);
}
}
if(!(status() & BV(CC2420_TX_ACTIVE))) {
/* SFD went high but we are not transmitting. This means that
we just started receiving a packet, so we drop the
transmission. */
RELEASE_LOCK();
return RADIO_TX_COLLISION;
}
if(receive_on) {
ENERGEST_OFF(ENERGEST_TYPE_LISTEN);
}
ENERGEST_ON(ENERGEST_TYPE_TRANSMIT);
/* We wait until transmission has ended so that we get an
accurate measurement of the transmission time.*/
BUSYWAIT_UNTIL(!(status() & BV(CC2420_TX_ACTIVE)), RTIMER_SECOND / 10);
#ifdef ENERGEST_CONF_LEVELDEVICE_LEVELS
ENERGEST_OFF_LEVEL(ENERGEST_TYPE_TRANSMIT,cc2420_get_txpower());
#endif
ENERGEST_OFF(ENERGEST_TYPE_TRANSMIT);
if(receive_on) {
ENERGEST_ON(ENERGEST_TYPE_LISTEN);
} else {
/* We need to explicitly turn off the radio,
* since STXON[CCA] -> TX_ACTIVE -> RX_ACTIVE */
off();
}
if(packetbuf_attr(PACKETBUF_ATTR_RADIO_TXPOWER) > 0) {
/* Restore the transmission power */
set_txpower(txpower & 0xff);
}
RELEASE_LOCK();
return RADIO_TX_OK;
}
}
/* If we are using WITH_SEND_CCA, we get here if the packet wasn't
transmitted because of other channel activity. */
RIMESTATS_ADD(contentiondrop);
PRINTF("cc2420: do_send() transmission never started\n");
if(packetbuf_attr(PACKETBUF_ATTR_RADIO_TXPOWER) > 0) {
/* Restore the transmission power */
set_txpower(txpower & 0xff);
}
RELEASE_LOCK();
return RADIO_TX_COLLISION;
}
