* Use uip_fw return codes.
* Use unicast retransmission scheme also for broadcasts.
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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 1.12 2007/04/30 09:41:42 bg- Exp $
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* @(#)$Id: cc2420.c,v 1.13 2007/05/02 14:51:20 bg- 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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@ -38,15 +38,16 @@
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#include <stdlib.h>
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#include <string.h>
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#include "contiki.h"
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#if defined(__AVR__)
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#include <avr/io.h>
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#elif defined(__MSP430__)
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#include <io.h>
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#endif
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#include "contiki.h"
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#include "net/uip.h"
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#include "net/uip-fw.h"
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#define BUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
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#include "dev/leds.h"
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@ -55,10 +56,13 @@
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#include "dev/cc2420.h"
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#include "dev/cc2420_const.h"
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#if 0
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define NDEBUG
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#include "lib/assert.h"
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#ifdef NDEBUG
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#define PRINTF(...) do {} while (0)
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#else
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#define PRINTF(...) printf(__VA_ARGS__)
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#endif
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PROCESS(cc2420_process, "CC2420 driver");
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@ -75,7 +79,7 @@ static u8_t receive_on;
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volatile u8_t cc2420_ack_received; /* Naive ACK management. */
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static u8_t last_used_seq;
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static u16_t last_correspondent;
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static u16_t last_dst;
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/* Radio stuff in network byte order. */
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static u16_t pan_id;
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@ -191,7 +195,7 @@ cc2420_send(struct hdr_802_15 *hdr, u8_t hdr_len,
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const u8_t *payload, u8_t payload_len)
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{
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u8_t spiStatusByte;
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int s;
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int s, ret;
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/* struct hdr_802_15::len shall *not* be counted, thus the -1.
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* 2 == sizeof(footer).
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@ -214,7 +218,7 @@ cc2420_send(struct hdr_802_15 *hdr, u8_t hdr_len,
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} while (spiStatusByte & BV(CC2420_TX_ACTIVE));
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hdr->dst_pan = pan_id; /* Not at fixed position! xxx/bg */
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last_correspondent = hdr->dst; /* Not dst either. */
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last_dst = hdr->dst; /* Not dst either. */
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last_used_seq++;
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hdr->seq = last_used_seq;
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cc2420_ack_received = 0;
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@ -226,28 +230,23 @@ cc2420_send(struct hdr_802_15 *hdr, u8_t hdr_len,
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FASTSPI_WRITE_FIFO(payload, payload_len);
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splx(s);
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if (hdr->dst == 0xffff) {
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int i;
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for (i = 0; i < 3; i++) {
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static unsigned delaymask[] = { 1024-1, 2048-1, 4096-1 };
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if (cc2420_resend() >= 0)
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return 0;
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PRINTF("resend i=%d\n", i);
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clock_delay(rand() & delaymask[i]);
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}
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} else {
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process_post(&cc2420_retransmit_process,
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PROCESS_EVENT_MSG,
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(void *)(unsigned)last_used_seq);
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ret = cc2420_resend(); /* Send stuff from FIFO. */
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if (hdr->dst == 0xffff && ret == UIP_FW_OK) {
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return ret;
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}
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return cc2420_resend(); /* Send stuff from FIFO. */
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process_post(&cc2420_retransmit_process,
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PROCESS_EVENT_MSG,
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(void *)(unsigned)last_used_seq);
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return UIP_FW_OK;
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}
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/*
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* Request packet to be sent using CSMA-CA. Requires that RSSI is
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* valid.
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*
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* Return -3 on failure.
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* Return UIP_FW_DROPPED on failure.
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*/
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int
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cc2420_resend(void)
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@ -257,7 +256,7 @@ cc2420_resend(void)
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if (FIFOP_IS_1 && !FIFO_IS_1) {
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/* RXFIFO overflow, send on retransmit. */
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PRINTF("rxfifo overflow!\n");
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// return -4;
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// return UIP_FW_DROPPED;
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}
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/* The TX FIFO can only hold one packet! Make sure to not overrun
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@ -277,12 +276,13 @@ cc2420_resend(void)
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for (i = LOOP_20_SYMBOLS; i > 0; i--)
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if (SFD_IS_1) {
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if (cc2420_status() & BV(CC2420_TX_ACTIVE))
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return 0; /* Transmission has started. */
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return UIP_FW_OK; /* Transmission has started. */
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else
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break; /* We must be receiving. */
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}
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}
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return -3; /* Transmission never started! */
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return UIP_FW_DROPPED; /* Transmission never started! */
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}
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void
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@ -479,7 +479,7 @@ PROCESS_THREAD(cc2420_process, ev, data)
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}
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if (len == 2) { /* A DATA ACK packet. */
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if (last_correspondent == h.src)
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if (last_dst == h.src)
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cc2420_ack_received = 1;
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neigbour_update(h.src, 0);
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} else if (len > 2 && uip_len > 0
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@ -526,18 +526,23 @@ PROCESS_THREAD(cc2420_retransmit_process, ev, data)
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} else if (seq != last_used_seq)
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break; /* Transmitting different packet. */
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else if (n < MAX_RETRANSMISSIONS) {
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cc2420_resend();
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int ret;
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PRINTF("RETRANS %d %d.%d\n", n, last_dst >> 8, last_dst & 0xff);
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ret = cc2420_resend();
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if (last_dst == 0xffff && ret == UIP_FW_OK) {
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etimer_stop(&etimer);
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break;
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}
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n++;
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PRINTF("RETRANS %d\n", n);
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} else {
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break;
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}
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} while (1);
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neigbour_update(last_correspondent, n);
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neigbour_update(last_dst, n);
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#if 0
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#define CORRELATION_2_X(c) (((c) < 48) ? 0 : ((c) - 48))
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PRINTF("%04x %2d %2d %2u %u\n",
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last_correspondent, n,
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last_dst, n,
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RSSI_2_ED(cc2420_last_rssi),
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CORRELATION_2_X(cc2420_last_correlation),
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clock_time());
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