Reworked the locking code, which seems to fix a few bugs caused by the interaction with contikimac. Contikimac performs a CCA check in a preempting rtimer, which requires underlying code to properly call the GET_LOCK() macro. This fix seems to solve most problems, but there may be others left.
This commit is contained in:
adamdunkels
parent
3769a28516
commit
0035a70537
1 changed files with 57 additions and 45 deletions
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@ -28,7 +28,7 @@
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*
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* This file is part of the Contiki operating system.
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*
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* @(#)$Id: cc2420.c,v 1.43 2010/03/09 15:45:29 joxe Exp $
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* @(#)$Id: cc2420.c,v 1.44 2010/03/14 22:45:20 adamdunkels Exp $
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*/
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/*
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* This code is almost device independent and should be easy to port.
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@ -184,7 +184,7 @@ static void
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on(void)
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{
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ENERGEST_ON(ENERGEST_TYPE_LISTEN);
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PRINTF("on\n");
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/* PRINTF("on\n");*/
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receive_on = 1;
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ENABLE_FIFOP_INT();
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@ -195,11 +195,11 @@ static void
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off(void)
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{
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leds_on(LEDS_GREEN);
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PRINTF("off\n");
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/* PRINTF("off\n");*/
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receive_on = 0;
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/* Wait for transmission to end before turning radio off. */
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// while(status() & BV(CC2420_TX_ACTIVE));
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while(status() & BV(CC2420_TX_ACTIVE));
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strobe(CC2420_SRFOFF);
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DISABLE_FIFOP_INT();
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@ -207,8 +207,9 @@ off(void)
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leds_off(LEDS_GREEN);
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}
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/*---------------------------------------------------------------------------*/
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#define GET_LOCK() locked = 1
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#define GET_LOCK() locked++
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static void RELEASE_LOCK(void) {
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if(locked == 1) {
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if(lock_on) {
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on();
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lock_on = 0;
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@ -217,7 +218,8 @@ static void RELEASE_LOCK(void) {
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off();
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lock_off = 0;
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}
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locked = 0;
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}
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locked--;
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}
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/*---------------------------------------------------------------------------*/
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static unsigned
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@ -355,6 +357,7 @@ cc2420_transmit(unsigned short payload_len)
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/* SFD went high but we are not transmitting. This means that
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we just started receiving a packet, so we drop the
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transmission. */
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RELEASE_LOCK();
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return RADIO_TX_ERR;
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}
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if(receive_on) {
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@ -453,20 +456,23 @@ cc2420_off(void)
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/* If we are called when the driver is locked, we indicate that the
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radio should be turned off when the lock is unlocked. */
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if(locked) {
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/* printf("Off when locked (%d)\n", locked);*/
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leds_on(LEDS_GREEN + LEDS_BLUE);
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lock_off = 1;
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return 1;
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}
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GET_LOCK();
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/* If we are currently receiving a packet (indicated by SFD == 1),
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we don't actually switch the radio off now, but signal that the
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driver should switch off the radio once the packet has been
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received and processed, by setting the 'lock_off' variable. */
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if(status() & BV(CC2420_TX_ACTIVE)) {
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lock_off = 1;
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return 1;
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}
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} else {
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off();
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}
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RELEASE_LOCK();
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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@ -477,11 +483,14 @@ cc2420_on(void)
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return 1;
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}
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if(locked) {
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leds_on(LEDS_GREEN + LEDS_RED);
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lock_on = 1;
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return 1;
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}
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GET_LOCK();
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on();
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RELEASE_LOCK();
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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@ -495,11 +504,12 @@ void
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cc2420_set_channel(int c)
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{
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uint16_t f;
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GET_LOCK();
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/*
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* Subtract the base channel (11), multiply by 5, which is the
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* channel spacing. 357 is 2405-2048 and 0x4000 is LOCK_THR = 1.
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*/
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channel = c;
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f = 5 * (c - 11) + 357 + 0x4000;
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@ -519,6 +529,7 @@ cc2420_set_channel(int c)
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strobe(CC2420_SRXON);
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}
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RELEASE_LOCK();
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}
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/*---------------------------------------------------------------------------*/
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void
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@ -528,6 +539,9 @@ cc2420_set_pan_addr(unsigned pan,
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{
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uint16_t f = 0;
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uint8_t tmp[2];
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GET_LOCK();
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/*
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* Writing RAM requires crystal oscillator to be stable.
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*/
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@ -548,6 +562,7 @@ cc2420_set_pan_addr(unsigned pan,
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}
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FASTSPI_WRITE_RAM_LE(tmp_addr, CC2420RAM_IEEEADDR, 8, f);
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}
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RELEASE_LOCK();
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}
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/*---------------------------------------------------------------------------*/
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/*
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@ -713,7 +728,11 @@ cc2420_set_txpower(uint8_t power)
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int
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cc2420_get_txpower(void)
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{
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return (int)(getreg(CC2420_TXCTRL) & 0x001f);
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int power;
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GET_LOCK();
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power = (int)(getreg(CC2420_TXCTRL) & 0x001f);
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RELEASE_LOCK();
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return power;
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}
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/*---------------------------------------------------------------------------*/
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int
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@ -722,6 +741,8 @@ cc2420_rssi(void)
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int rssi;
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int radio_was_off = 0;
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GET_LOCK();
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if(!receive_on) {
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radio_was_off = 1;
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cc2420_on();
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@ -735,13 +756,21 @@ cc2420_rssi(void)
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if(radio_was_off) {
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cc2420_off();
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}
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RELEASE_LOCK();
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return rssi;
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}
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/*---------------------------------------------------------------------------*/
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int
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cc2420_cca_valid(void)
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{
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return !!(status() & BV(CC2420_RSSI_VALID));
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int valid;
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if(locked) {
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return 1;
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}
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GET_LOCK();
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valid = !!(status() & BV(CC2420_RSSI_VALID));
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RELEASE_LOCK();
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return valid;
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}
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/*---------------------------------------------------------------------------*/
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static int
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@ -758,6 +787,7 @@ cc2420_cca(void)
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return 1;
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}
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GET_LOCK();
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if(!receive_on) {
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radio_was_off = 1;
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cc2420_on();
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@ -765,6 +795,7 @@ cc2420_cca(void)
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/* Make sure that the radio really got turned on. */
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if(!receive_on) {
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RELEASE_LOCK();
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return 1;
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}
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@ -777,6 +808,7 @@ cc2420_cca(void)
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if(radio_was_off) {
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cc2420_off();
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}
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RELEASE_LOCK();
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return cca;
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}
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/*---------------------------------------------------------------------------*/
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@ -793,31 +825,11 @@ pending_packet(void)
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}
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/*---------------------------------------------------------------------------*/
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void
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cc2420_ugly_hack_send_only_one_symbol(void)
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{
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uint8_t len;
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GET_LOCK();
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/* Write packet to TX FIFO. */
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strobe(CC2420_SFLUSHTX);
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len = 1;
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FASTSPI_WRITE_FIFO(&len, 1);
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FASTSPI_WRITE_FIFO(&len, 1);
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strobe(CC2420_STXON);
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while(!SFD_IS_1);
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/* Turn radio off immediately after sending the first symbol. */
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strobe(CC2420_SRFOFF);
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RELEASE_LOCK();
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return;
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}
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/*---------------------------------------------------------------------------*/
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void
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cc2420_set_cca_threshold(int value)
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{
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uint16_t shifted = value << 8;
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GET_LOCK();
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setreg(CC2420_RSSI, shifted);
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RELEASE_LOCK();
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}
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/*---------------------------------------------------------------------------*/
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