/*---------------------------------------------------------------------------*/
static int
cc2420_prepare(const void *payload, unsigned short payload_len)
{
uint8_t total_len;
#if CC2420_CONF_CHECKSUM
uint16_t checksum;
#endif /* CC2420_CONF_CHECKSUM */
GET_LOCK();
PRINTF("cc2420: sending %d bytes\n", payload_len);
RIMESTATS_ADD(lltx);
/* Wait for any previous transmission to finish. */
/* while(status() & BV(CC2420_TX_ACTIVE));*/
/* Write packet to TX FIFO. */
strobe(CC2420_SFLUSHTX);
#if CC2420_CONF_CHECKSUM
checksum = crc16_data(payload, payload_len, 0);
#endif /* CC2420_CONF_CHECKSUM */
total_len = payload_len + AUX_LEN;
FASTSPI_WRITE_FIFO(&total_len, 1);
FASTSPI_WRITE_FIFO(payload, payload_len);
#if CC2420_CONF_CHECKSUM
FASTSPI_WRITE_FIFO(&checksum, CHECKSUM_LEN);
#endif /* CC2420_CONF_CHECKSUM */
RELEASE_LOCK();
return 0;
}
int
cc2420_send(struct hdr_802_15 *hdr, u8_t hdr_len,
const u8_t *payload, u8_t payload_len)
{
u8_t spiStatusByte;
int s;
/* struct hdr_802_15::len shall *not* be counted, thus the -1.
* 2 == sizeof(footer).
*/
if (((hdr_len - 1) + payload_len + 2) > MAX_PACKET_LEN)
return -1;
/* This code uses the CC2420 CCA (Clear Channel Assessment) to
* implement Carrier Sense Multiple Access with Collision Avoidance
* (CSMA-CA) and requires the receiver to be enabled and ready.
*/
if (!receive_on)
return -2;
/* Wait for previous transmission to finish and RSSI. */
do {
spiStatusByte = cc2420_status();
if (!(spiStatusByte & BV(CC2420_RSSI_VALID))) /* RSSI needed by CCA */
continue;
} while (spiStatusByte & BV(CC2420_TX_ACTIVE));
hdr->dst_pan = pan_id; /* Not at fixed position! xxx/bg */
last_dst = hdr->dst; /* Not dst either. */
last_used_seq++;
hdr->seq = last_used_seq;
cc2420_ack_received = 0;
/* Write packet to TX FIFO, appending FCS if AUTOCRC is enabled. */
cc2420_strobe(CC2420_SFLUSHTX); /* Cancel send that never started. */
s = splhigh();
FASTSPI_WRITE_FIFO(hdr, hdr_len);
FASTSPI_WRITE_FIFO(payload, payload_len);
splx(s);
/* Send stuff from FIFO now! */
process_post_synch(&cc2420_retransmit_process, PROCESS_EVENT_MSG, NULL);
return UIP_FW_OK;
}
/*---------------------------------------------------------------------------*/
void
cc2420_ugly_hack_send_only_one_symbol(void)
{
uint8_t len;
GET_LOCK();
/* Write packet to TX FIFO. */
strobe(CC2420_SFLUSHTX);
len = 1;
FASTSPI_WRITE_FIFO(&len, 1);
FASTSPI_WRITE_FIFO(&len, 1);
strobe(CC2420_STXON);
while(!SFD_IS_1);
/* Turn radio off immediately after sending the first symbol. */
strobe(CC2420_SRFOFF);
RELEASE_LOCK();
return;
}
//-------------------------------------------------------------------------------------------------------
// BYTE rf_tx_packet(RF_TX_INFO *pRTI)
//
// DESCRIPTION:
// Transmits a packet using the IEEE 802.15.4 MAC data packet format with short addresses. CCA is
// measured only once before backet transmission (not compliant with 802.15.4 CSMA-CA).
// The function returns:
// - When pRTI->ackRequest is FALSE: After the transmission has begun (SFD gone high)
// - When pRTI->ackRequest is TRUE: After the acknowledgment has been received/declared missing.
// The acknowledgment is received through the FIFOP interrupt.
//
// ARGUMENTS:
// RF_TX_INFO *pRTI
// The transmission structure, which contains all relevant info about the packet.
//
// RETURN VALUE:
// uint8_t
// Successful transmission (acknowledgment received)
//-------------------------------------------------------------------------------------------------------
uint8_t rf_tx_packet(RF_TX_INFO *pRTI)
{
uint16_t frameControlField;
uint8_t packetLength, length;
uint8_t success;
uint8_t spiStatusByte;
uint8_t checksum,i;
#ifdef RADIO_PRIORITY_CEILING
nrk_sem_pend(radio_sem);
#endif
#ifdef CC2420_OSC_OPT
FASTSPI_STROBE(CC2420_SXOSCON);
nrk_spin_wait_us(OSC_STARTUP_DELAY);
#endif
if(security_enable)
FASTSPI_STROBE(CC2420_STXENC);
checksum=0;
for(i=0; i<pRTI->length; i++ )
{
// lets do our own payload checksum because we don't trust the CRC
checksum+=pRTI->pPayload[i];
}
// Write the packet to the TX FIFO (the FCS is appended automatically when AUTOCRC is enabled)
// These are only the MAC AGNOSTIC parameters...
// Slots for example are at a slighly higher later since they assume TDMA
packetLength = pRTI->length + RF_PACKET_OVERHEAD_SIZE + CHECKSUM_OVERHEAD;
if(security_enable) packetLength+=4; // for CTR counter
// XXX 2 below are hacks...
FASTSPI_STROBE(CC2420_SFLUSHRX);
FASTSPI_STROBE(CC2420_SFLUSHRX);
// Wait until the transceiver is idle
while (FIFOP_IS_1 || SFD_IS_1);
// Turn off global interrupts to avoid interference on the SPI interface
DISABLE_GLOBAL_INT();
// Flush the TX FIFO just in case...
FASTSPI_STROBE(CC2420_SFLUSHTX);
FASTSPI_STROBE(CC2420_SFLUSHTX);
/*
// Turn on RX if necessary
if (!rfSettings.receiveOn) {
FASTSPI_STROBE(CC2420_SRXON);
}
// Wait for the RSSI value to become valid
do {
FASTSPI_UPD_STATUS(spiStatusByte);
} while (!(spiStatusByte & BM(CC2420_RSSI_VALID)));
// TX begins after the CCA check has passed
do {
FASTSPI_STROBE(CC2420_STXONCCA);
FASTSPI_UPD_STATUS(spiStatusByte);
halWait(100);
} while (!(spiStatusByte & BM(CC2420_TX_ACTIVE)));
*/
FASTSPI_WRITE_FIFO((uint8_t*)&packetLength, 1); // Packet length
frameControlField = RF_FCF_NOACK; // default
if(auto_ack_enable) frameControlField |= RF_ACK_BM;
if(security_enable) frameControlField |= RF_SEC_BM;
FASTSPI_WRITE_FIFO((uint8_t*) &frameControlField, 2); // Frame control field
FASTSPI_WRITE_FIFO((uint8_t*) &rfSettings.txSeqNumber, 1); // Sequence number
FASTSPI_WRITE_FIFO((uint8_t*) &rfSettings.panId, 2); // Dest. PAN ID
FASTSPI_WRITE_FIFO((uint8_t*) &pRTI->destAddr, 2); // Dest. address
FASTSPI_WRITE_FIFO((uint8_t*) &rfSettings.myAddr, 2); // Source address
if(security_enable)
FASTSPI_WRITE_FIFO((uint8_t*) &tx_ctr, 4); // CTR counter
FASTSPI_WRITE_FIFO((uint8_t*) pRTI->pPayload, pRTI->length); // Payload
FASTSPI_WRITE_FIFO((uint8_t*) &checksum, 1); // Checksum
if (pRTI->cca == TRUE)
{
uint8_t cnt;
if (!rfSettings.receiveOn)
{
FASTSPI_STROBE (CC2420_SRXON);
}
// Wait for the RSSI value to become valid
do
{
FASTSPI_UPD_STATUS (spiStatusByte);
}
while (!(spiStatusByte & BM (CC2420_RSSI_VALID)));
// TX begins after the CCA check has passed
cnt = 0;
do
{
FASTSPI_STROBE (CC2420_STXONCCA);
FASTSPI_UPD_STATUS (spiStatusByte);
cnt++;
if (cnt > 100)
{
ENABLE_GLOBAL_INT ();
nrk_sem_post(radio_sem);
return FALSE;
}
halWait (100);
}
while (!(spiStatusByte & BM (CC2420_TX_ACTIVE)));
}
else
FASTSPI_STROBE (CC2420_STXON);
ENABLE_GLOBAL_INT();
// Wait for the transmission to begin before exiting (makes sure that this function cannot be called
// a second time, and thereby cancelling the first transmission (observe the FIFOP + SFD test above).
while (!SFD_IS_1);
success = TRUE;
// Turn interrupts back on
// ENABLE_GLOBAL_INT();
while (SFD_IS_1); // wait for packet to finish
// Wait for the acknowledge to be received, if any
if (auto_ack_enable)
{
// rfSettings.ackReceived = FALSE;
// Wait for the SFD to go low again
// while (SFD_IS_1);
// We'll enter RX automatically, so just wait until we can be sure that the
// ack reception should have finished
// The timeout consists of a 12-symbol turnaround time, the ack packet duration,
// and a small margin
halWait((12 * RF_SYMBOL_DURATION) + (RF_ACK_DURATION) + (2 * RF_SYMBOL_DURATION) + 100);
if(FIFO_IS_1)
{
FASTSPI_READ_FIFO_BYTE(length);
length &= RF_LENGTH_MASK; // Ignore MSB
success = TRUE;
}
else
{
FASTSPI_STROBE(CC2420_SFLUSHRX);
FASTSPI_STROBE(CC2420_SFLUSHRX);
success = FALSE;
}
}
// Turn off the receiver if it should not continue to be enabled
DISABLE_GLOBAL_INT();
//FASTSPI_STROBE(CC2420_SFLUSHRX);
//FASTSPI_STROBE(CC2420_SFLUSHRX);
//FASTSPI_STROBE(CC2420_SFLUSHTX);
//FASTSPI_STROBE(CC2420_SFLUSHTX);
#ifdef CC2420_OSC_OPT
FASTSPI_STROBE(CC2420_SXOSCOFF);
#endif
FASTSPI_STROBE(CC2420_SRFOFF); // shut off radio
ENABLE_GLOBAL_INT();
// agr XXX hack to test time issue
//rf_rx_on();
// Increment the sequence number, and return the result
rfSettings.txSeqNumber++;
// while (SFD_IS_1);
#ifdef RADIO_PRIORITY_CEILING
nrk_sem_post(radio_sem);
#endif
return success;
}
/**************************************************************************
This function is the same as normal TX, only it waits until the last
second to send the duty out with the high speed timer. And by duty, I mean
the packet BIATCH...
**************************************************************************/
uint8_t rf_tx_tdma_packet(RF_TX_INFO *pRTI, uint16_t slot_start_time, uint16_t tx_guard_time)
{
uint16_t frameControlField;
uint8_t packetLength;
uint8_t success;
uint8_t spiStatusByte;
uint8_t checksum,i;
uint8_t timestamp;
#ifdef RADIO_PRIORITY_CEILING
nrk_sem_pend (radio_sem);
#endif
timestamp=_nrk_os_timer_get();
// XXX 2 below are hacks...
#ifdef CC2420_OSC_OPT
FASTSPI_STROBE(CC2420_SXOSCON);
nrk_spin_wait_us(OSC_STARTUP_DELAY);
#endif
FASTSPI_STROBE(CC2420_SFLUSHRX);
FASTSPI_STROBE(CC2420_SFLUSHRX);
// Wait until the transceiver is idle
while (FIFOP_IS_1 || SFD_IS_1);
// Turn off global interrupts to avoid interference on the SPI interface
DISABLE_GLOBAL_INT();
// Flush the TX FIFO just in case...
FASTSPI_STROBE(CC2420_SFLUSHTX);
FASTSPI_STROBE(CC2420_SFLUSHTX);
checksum=0;
for(i=0; i<pRTI->length; i++ )
{
// lets do our own payload checksum because we don't trust the CRC
checksum+=pRTI->pPayload[i];
}
packetLength = pRTI->length + RF_PACKET_OVERHEAD_SIZE + CHECKSUM_OVERHEAD;
//nrk_set_led(3);
//do { } while(_nrk_get_high_speed_timer()<(tx_guard_time));
// Write the packet to the TX FIFO (the FCS is appended automatically when AUTOCRC is enabled)
// These are only the MAC AGNOSTIC parameters...
// Slots for example are at a higher layer since they assume TDMA
FASTSPI_WRITE_FIFO((uint8_t*)&packetLength, 1); // Packet length
frameControlField = pRTI->ackRequest ? RF_FCF_ACK : RF_FCF_NOACK;
FASTSPI_WRITE_FIFO((uint8_t*) &frameControlField, 2); // Frame control field
FASTSPI_WRITE_FIFO((uint8_t*) &rfSettings.txSeqNumber, 1); // Sequence number
FASTSPI_WRITE_FIFO((uint8_t*) &rfSettings.panId, 2); // Dest. PAN ID
FASTSPI_WRITE_FIFO((uint8_t*) &pRTI->destAddr, 2); // Dest. address
FASTSPI_WRITE_FIFO((uint8_t*) &rfSettings.myAddr, 2); // Source address
nrk_high_speed_timer_wait(slot_start_time,tx_guard_time);
//nrk_clr_led(3);
/*
DISABLE_GLOBAL_INT();
nrk_set_led(3);
last=0;
do {
if(last==_nrk_get_high_speed_timer())
{
//while(1)
//printf( "TX ERROR %d vs %d\r\n",_nrk_get_high_speed_timer(),tx_guard_time );
break;
}
last=_nrk_get_high_speed_timer();
}
while((volatile)last<(tx_guard_time));
ENABLE_GLOBAL_INT();
nrk_clr_led(3);
*/
/*
// Turn on RX if necessary
if (!rfSettings.receiveOn) {
FASTSPI_STROBE(CC2420_SRXON);
}
// Wait for the RSSI value to become valid
do {
FASTSPI_UPD_STATUS(spiStatusByte);
} while (!(spiStatusByte & BM(CC2420_RSSI_VALID)));
// TX begins after the CCA check has passed
do {
FASTSPI_STROBE(CC2420_STXONCCA);
FASTSPI_UPD_STATUS(spiStatusByte);
halWait(100);
} while (!(spiStatusByte & BM(CC2420_TX_ACTIVE)));
*/
if (pRTI->cca == TRUE)
{
uint8_t cnt;
if (!rfSettings.receiveOn)
{
FASTSPI_STROBE (CC2420_SRXON);
}
// Wait for the RSSI value to become valid
do
{
FASTSPI_UPD_STATUS (spiStatusByte);
}
while (!(spiStatusByte & BM (CC2420_RSSI_VALID)));
// TX begins after the CCA check has passed
cnt = 0;
do
{
FASTSPI_STROBE (CC2420_STXONCCA);
FASTSPI_UPD_STATUS (spiStatusByte);
cnt++;
if (cnt > 100)
{
ENABLE_GLOBAL_INT ();
nrk_sem_post(radio_sem);
return FALSE;
}
halWait (100);
}
while (!(spiStatusByte & BM (CC2420_TX_ACTIVE)));
}
else
FASTSPI_STROBE (CC2420_STXON);
//nrk_gpio_set(DEBUG_0);
// Fill in the rest of the packet now
FASTSPI_WRITE_FIFO((uint8_t*) pRTI->pPayload, pRTI->length); // Payload
FASTSPI_WRITE_FIFO((uint8_t*) &checksum, 1); // Checksum
//nrk_spin_wait_us(200);
// FASTSPI_STROBE(CC2420_STXON);
// Wait for the transmission to begin before exiting (makes sure that this function cannot be called
// a second time, and thereby cancelling the first transmission (observe the FIFOP + SFD test above).
while (!SFD_IS_1);
success = TRUE;
// Turn interrupts back on
// ENABLE_GLOBAL_INT();
// Wait for the acknowledge to be received, if any
/*if (pRTI->ackRequest) {
rfSettings.ackReceived = FALSE;
// Wait for the SFD to go low again
while (SFD_IS_1);
// We'll enter RX automatically, so just wait until we can be sure that the ack reception should have finished
// The timeout consists of a 12-symbol turnaround time, the ack packet duration, and a small margin
halWait((12 * RF_SYMBOL_DURATION) + (RF_ACK_DURATION) + (2 * RF_SYMBOL_DURATION) + 100);
// If an acknowledgment has been received (by the FIFOP interrupt), the ackReceived flag should be set
success = rfSettings.ackReceived;
}*/
// Turn off the receiver if it should not continue to be enabled
DISABLE_GLOBAL_INT();
// XXX hack, temp out
//if (!rfSettings.receiveOn) { while (SFD_IS_1); /*FASTSPI_STROBE(CC2420_SRFOFF);*/ }
// while (SFD_IS_1);
while (SFD_IS_1); // wait for packet to finish
FASTSPI_STROBE(CC2420_SFLUSHRX);
FASTSPI_STROBE(CC2420_SFLUSHRX);
FASTSPI_STROBE(CC2420_SFLUSHTX);
FASTSPI_STROBE(CC2420_SFLUSHTX);
#ifdef CC2420_OSC_OPT
FASTSPI_STROBE(CC2420_SXOSCOFF);
#endif
FASTSPI_STROBE(CC2420_SRFOFF); // shut off radio
ENABLE_GLOBAL_INT();
// Increment the sequence number, and return the result
rfSettings.txSeqNumber++;
// while (SFD_IS_1);
#ifdef RADIO_PRIORITY_CEILING
nrk_sem_post(radio_sem);
#endif
return success;
}
/*---------------------------------------------------------------------------*/
int
cc2420_send(const void *payload, unsigned short payload_len)
{
int i;
uint8_t total_len;
struct timestamp timestamp;
uint16_t checksum;
GET_LOCK();
PRINTF("cc2420: sending %d bytes\n", payload_len);
RIMESTATS_ADD(lltx);
/* Wait for any previous transmission to finish. */
while(status() & BV(CC2420_TX_ACTIVE));
/* Write packet to TX FIFO. */
strobe(CC2420_SFLUSHTX);
checksum = crc16_data(payload, payload_len, 0);
total_len = payload_len + AUX_LEN;
FASTSPI_WRITE_FIFO(&total_len, 1);
FASTSPI_WRITE_FIFO(payload, payload_len);
FASTSPI_WRITE_FIFO(&checksum, CHECKSUM_LEN);
#if CC2420_CONF_TIMESTAMPS
timestamp.authority_level = timesynch_authority_level();
timestamp.time = timesynch_time();
FASTSPI_WRITE_FIFO(×tamp, TIMESTAMP_LEN);
#endif /* CC2420_CONF_TIMESTAMPS */
/* 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.
*/
#ifdef TMOTE_SKY
#define LOOP_20_SYMBOLS 100 /* 326us (msp430 @ 2.4576MHz) */
#elif __AVR__
#define LOOP_20_SYMBOLS 500 /* XXX */
#endif
#if WITH_SEND_CCA
strobe(CC2420_SRXON);
while(!(status() & BV(CC2420_RSSI_VALID)));
strobe(CC2420_STXONCCA);
#else /* WITH_SEND_CCA */
strobe(CC2420_STXON);
#endif /* WITH_SEND_CCA */
for(i = LOOP_20_SYMBOLS; i > 0; i--) {
if(SFD_IS_1) {
#if CC2420_CONF_TIMESTAMPS
rtimer_clock_t txtime = timesynch_time();
#endif /* CC2420_CONF_TIMESTAMPS */
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.*/
while(status() & BV(CC2420_TX_ACTIVE));
#if CC2420_CONF_TIMESTAMPS
setup_time_for_transmission = txtime - timestamp.time;
if(num_transmissions < 10000) {
total_time_for_transmission += timesynch_time() - txtime;
total_transmission_len += total_len;
num_transmissions++;
}
#endif /* CC2420_CONF_TIMESTAMPS */
#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);
}
RELEASE_LOCK();
return 0;
}
}
/* 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");
RELEASE_LOCK();
return -3; /* Transmission never started! */
}
