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* Perform RXFIFO overflow check as late as possible when sending.

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This commit is contained in:
bg- 2007-02-01 14:00:27 +00:00
parent 394992b99f
commit 95164eb39f
1 changed files with 9 additions and 7 deletions
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16
core/dev/cc2420.c
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@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* @(#)$Id: cc2420.c,v 1.9 2007/01/24 16:26:55 bg- Exp $
* @(#)$Id: cc2420.c,v 1.10 2007/02/01 14:00:27 bg- Exp $
*/
/*
* This code is almost device independent and should be easy to port.
@ -173,6 +173,8 @@ cc2420_send_data_ack(u16_t mac)
{
struct hdr_802_15 h;
PRINTF("send_data_ack to %u.%u\n", mac & 0xff, mac >> 8);
h.len = MAC_HDR_LEN + 2; /* Including footer[2]. */
h.fc0 = FC0_TYPE_DATA | FC0_INTRA_PAN;
h.fc1 = FC1_DST_16 | FC1_SRC_16;
@ -203,12 +205,6 @@ cc2420_send(struct hdr_802_15 *hdr, u8_t hdr_len,
if (!receive_on)
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. */
do {
spiStatusByte = cc2420_status();
@ -255,6 +251,12 @@ cc2420_resend(void)
{
unsigned i;
if (FIFOP_IS_1 && !FIFO_IS_1) {
/* RXFIFO overflow, send on retransmit. */
PRINTF("rxfifo overflow!\n");
return -4;
}
/* 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.