giomba/nes-proj
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Added calibration to channel switch if currently in receive mode. Added explicit checks for transmission activity before channel switch

Browse Source
This commit is contained in:
adamdunkels 2008-01-24 13:09:16 +00:00
parent af73a358f4
commit dc70ac2584
1 changed files with 21 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
core/dev/simple-cc2420.c
View File

@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* @(#)$Id: simple-cc2420.c,v 1.25 2008/01/23 14:57:19 adamdunkels Exp $
* @(#)$Id: simple-cc2420.c,v 1.26 2008/01/24 13:09:16 adamdunkels Exp $
*/
/*
* This code is almost device independent and should be easy to port.
@ -158,14 +158,11 @@ on(void)
static void
off(void)
{
uint8_t spiStatusByte;
PRINTF("off\n");
receive_on = 0;
/* Wait for transmission to end before turning radio off. */
do {
spiStatusByte = status();
} while(spiStatusByte & BV(CC2420_TX_ACTIVE));
while(status() & BV(CC2420_TX_ACTIVE));
strobe(CC2420_SRFOFF);
DISABLE_FIFOP_INT();
@ -274,23 +271,22 @@ simple_cc2420_send(const void *payload, unsigned short payload_len)
int i;
uint8_t total_len;
struct timestamp timestamp;
GET_LOCK();
RIMESTATS_ADD(lltx);
/* Wait for any previous transmission to finish. */
while(status() & BV(CC2420_TX_ACTIVE));
/* Write packet to TX FIFO. */
strobe(CC2420_SFLUSHTX);
total_len = payload_len + TIMESTAMP_LEN + FOOTER_LEN;
FASTSPI_WRITE_FIFO(&total_len, 1);
FASTSPI_WRITE_FIFO(payload, payload_len);
#if SIMPLE_CC2420_CONF_TIMESTAMPS
timestamp.authority_level = timesynch_authority_level();
timestamp.time = timesynch_time();
@ -327,6 +323,8 @@ simple_cc2420_send(const void *payload, unsigned short payload_len)
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 SIMPLE_CC2420_CONF_TIMESTAMPS
@ -347,7 +345,7 @@ simple_cc2420_send(const void *payload, unsigned short payload_len)
ENERGEST_ON(ENERGEST_TYPE_LISTEN);
RELEASE_LOCK();
return 0; /* Transmission has started. */
return 0;
}
}
@ -419,8 +417,18 @@ simple_cc2420_set_channel(int c)
* Writing RAM requires crystal oscillator to be stable.
*/
while(!(status() & (BV(CC2420_XOSC16M_STABLE))));
/* Wait for any transmission to end. */
while(status() & BV(CC2420_TX_ACTIVE));
setreg(CC2420_FSCTRL, f);
/* If we are in receive mode, we issue an SRXON command to ensure
that the VCO is calibrated. */
if(receive_on) {
strobe(CC2420_SRXON);
}
}
/*---------------------------------------------------------------------------*/
void