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

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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
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34
core/dev/simple-cc2420.c
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@ -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