deac/osd-contiki
1
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

* Initial AVR port.

Browse source 
* Check for RXFIFO overflow before sending.

* Fix in loop that waits for SFD start.
This commit is contained in:
bg- 2007-01-24 16:26:55 +00:00
parent 83b348631f
commit 2a879202a2
1 changed files with 18 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

27
core/dev/cc2420.c
View file

@ -28,21 +28,22 @@
* *
* This file is part of the Contiki operating system. * This file is part of the Contiki operating system.
* *
* @(#)$Id: cc2420.c,v 1.8 2006/12/20 13:42:55 bg- Exp $ * @(#)$Id: cc2420.c,v 1.9 2007/01/24 16:26:55 bg- Exp $
*/ */
/* /*
* This code is almost device independent and should be possible to * This code is almost device independent and should be easy to port.
* port to the AVR.
*/ */
#include <stdio.h> #include <stdio.h>
#include <string.h> #include <string.h>
#include <io.h>
#include <signal.h>
#include "contiki.h" #include "contiki.h"
#include "sys/clock.h"
#if defined(__AVR__)
#include <avr/io.h>
#elif defined(__MSP430__)
#include <io.h>
#endif
#include "net/uip.h" #include "net/uip.h"
#define BUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN]) #define BUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
@ -202,6 +203,12 @@ cc2420_send(struct hdr_802_15 *hdr, u8_t hdr_len,
if (!receive_on) if (!receive_on)
return -2; return -2;
if (FIFOP_IS_1 && !FIFO_IS_1) {
/* RXFIFO overflow, send on retransmit. */
printf("RXFIFO overflow!\n");
return -4;
}
/* Wait for previous transmission to finish and RSSI. */ /* Wait for previous transmission to finish and RSSI. */
do { do {
spiStatusByte = cc2420_status(); spiStatusByte = cc2420_status();
@ -246,7 +253,7 @@ cc2420_send(struct hdr_802_15 *hdr, u8_t hdr_len,
int int
cc2420_resend(void) cc2420_resend(void)
{ {
int i; unsigned i;
/* The TX FIFO can only hold one packet! Make sure to not overrun /* The TX FIFO can only hold one packet! Make sure to not overrun
* FIFO by waiting for transmission to start here and synchronizing * FIFO by waiting for transmission to start here and synchronizing
@ -257,9 +264,11 @@ cc2420_resend(void)
*/ */
#ifdef TMOTE_SKY #ifdef TMOTE_SKY
#define LOOP_20_SYMBOLS 100 /* 326us (msp430 @ 2.4576MHz) */ #define LOOP_20_SYMBOLS 100 /* 326us (msp430 @ 2.4576MHz) */
#elif __AVR__
#define LOOP_20_SYMBOLS 500 /* XXX */
#endif #endif
cc2420_strobe(CC2420_STXONCCA); cc2420_strobe(CC2420_STXONCCA);
for (i = 0; i < LOOP_20_SYMBOLS; i++) for (i = LOOP_20_SYMBOLS; i > 0; i--)
if (SFD_IS_1) if (SFD_IS_1)
return 0; /* Transmission has started. */ return 0; /* Transmission has started. */