radio driver with busy-wait support
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fros4943
parent
f3311d5d4c
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41578b35c4
@ -26,7 +26,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: radio-arch.c,v 1.1 2006/08/21 12:11:20 fros4943 Exp $
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* $Id: radio-arch.c,v 1.2 2006/10/02 15:06:12 fros4943 Exp $
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*/
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#include "dev/radio-arch.h"
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@ -40,109 +40,56 @@
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#include "net/uip.h"
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#include "net/uip-fw.h"
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#include "sys/etimer.h"
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#include "sys/cooja_mt.h"
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#include "sys/log.h"
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const struct simInterface radio_interface;
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// COOJA variables
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char simReceivedPacket;
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char simSentPacket;
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char simReceivedPacketData[UIP_BUFSIZE];
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char simSentPacketData[UIP_BUFSIZE];
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int simSentPacketSize;
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int simReceivedPacketSize;
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char simEtherBusy;
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int retryCounter;
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char simTransmitting;
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char simReceiving;
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char simInDataBuffer[UIP_BUFSIZE];
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int simInSize;
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char simOutDataBuffer[UIP_BUFSIZE];
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int simOutSize;
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char simRadioHWOn = 1;
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// Ether process
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PROCESS(ether_process, "Simulated Ether");
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PROCESS_THREAD(ether_process, ev, data)
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{
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static struct etimer send_timer;
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PROCESS_BEGIN();
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// All outgoing messages pass through this process
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// By using the COOJA variables simEtherBusy and !!!!TODO signalstrength!!!!
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// this may be used to imitate a simple MAC protocol.
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while(1) {
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PROCESS_WAIT_EVENT();
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// MAC protocol imitiation
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// (this process is polled from simDoSend())
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// Confirm we actually have data to send and radio hardware is on
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if (simRadioHWOn && simSentPacketSize > 0) {
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// Wait some random time to avoid initial collisions
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// MAC uses external random generator to get stochastic radio behaviour
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etimer_set(&send_timer, rand() % 20);
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PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&send_timer));
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retryCounter = 0;
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while (simEtherBusy && retryCounter < 5) {
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retryCounter++;
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// Wait some random time hoping ether will free
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// MAC uses external random generator to get stochastic radio behaviour
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etimer_set(&send_timer, rand() % 20);
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PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&send_timer));
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}
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if (simEtherBusy) {
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log_message("MAC layer skipping packet", "");
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} else {
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// Tell COOJA about our new packet
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simSentPacket = 1;
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}
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}
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}
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PROCESS_END();
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}
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int simSignalStrength;
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/*-----------------------------------------------------------------------------------*/
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static void
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doInterfaceActionsBeforeTick(void)
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{
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// Handle incoming network packets if any
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if (simReceivedPacket) {
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// If hardware is turned off, just remove packet
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if (!simRadioHWOn) {
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simReceivedPacket = 0;
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simReceivedPacketSize = 0;
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return;
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}
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// Reset flag
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simReceivedPacket = 0;
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if (simReceivedPacketSize == 0) {
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fprintf(stderr, "simReceivedPacketSize == 0: Didn't I receive a packet?\n");
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return;
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}
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// Copy incoming data to correct buffers and call handling routines
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uip_len = simReceivedPacketSize;
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if(uip_len > UIP_BUFSIZE) {
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fprintf(stderr, "doInterfaceActionsBeforeTick>> uip_len too large - dropping\n");
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uip_len = 0;
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} else {
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memcpy(&uip_buf[UIP_LLH_LEN], &simReceivedPacketData[0], simReceivedPacketSize);
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simReceivedPacketSize = 0;
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// Handle new packet
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tcpip_input();
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}
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// If radio is turned off, do nothing
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if (!simRadioHWOn) {
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simInSize = 0;
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return;
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}
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// If no incoming radio data, do nothing
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if (simInSize == 0) {
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return;
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}
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// Busy-wait while receiving (in main file)
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while (simReceiving) {
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busyWaitNext = 1;
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return;
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}
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// Check size of received packet
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if (simInSize > UIP_BUFSIZE) {
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// Drop packet by not delivering
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return;
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}
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// Hand over new packet to uIP
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uip_len = simInSize;
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memcpy(&uip_buf[UIP_LLH_LEN], &simInDataBuffer[0], simInSize);
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tcpip_input();
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simInSize = 0;
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}
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/*-----------------------------------------------------------------------------------*/
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@ -155,30 +102,54 @@ doInterfaceActionsAfterTick(void)
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u8_t
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simDoSend(void)
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{
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// If hardware is turned off, just remove packet
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// If radio is turned off, do nothing
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if (!simRadioHWOn) {
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// Should we reset uip_len if radio is off?
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// TODO Should we reset uip_len if radio is off?
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uip_len = 0;
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return UIP_FW_DROPPED;
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}
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// If outgoing data, but too large, drop it
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// Drop packet if data size too large
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if(uip_len > UIP_BUFSIZE) {
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fprintf(stderr, "simDoSend>> uip_len too large - dropping\n");
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uip_len = 0;
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return UIP_FW_TOOLARGE;
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}
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// If outgoing data, back it up, and wake ether process
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if (uip_len > 0) {
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// Backup packet data/size
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memcpy(&simSentPacketData[0], &uip_buf[UIP_LLH_LEN], uip_len);
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simSentPacketSize = uip_len;
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process_poll(ðer_process);
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return UIP_FW_OK;
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// Drop packet if no data length
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if (uip_len <= 0) {
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return UIP_FW_ZEROLEN;
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}
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return UIP_FW_ZEROLEN;
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// - Initiate transmission -
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simTransmitting = 1;
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// Copy packet data to temporary storage
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memcpy(&simOutDataBuffer[0], &uip_buf[UIP_LLH_LEN], uip_len);
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simOutSize = uip_len;
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// Busy-wait while we are receiving
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while (simReceiving) {
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cooja_mt_yield();
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}
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// Busy-wait until ether is ready, or die (MAC imitation)
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int retries=0;
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/* while (retries < 5 && simSignalStrength > -80) {
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// TODO Retry and signal strength threshold values?
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retries++;
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printf("WAITING FOR ETHER! (null)\n");
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cooja_mt_yield();
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}
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if (simSignalStrength > -80) {
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return UIP_FW_DROPPED;
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}
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*/
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// Busy-wait while transmitting
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while (simTransmitting) {
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cooja_mt_yield();
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}
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return UIP_FW_OK;
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}
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/*-----------------------------------------------------------------------------------*/
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/**
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@ -26,7 +26,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: radio-arch.h,v 1.1 2006/08/21 12:11:18 fros4943 Exp $
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* $Id: radio-arch.h,v 1.2 2006/10/02 15:06:12 fros4943 Exp $
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*/
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#ifndef __RADIO_ARCH_H__
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@ -35,7 +35,7 @@
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#include "contiki.h"
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#include "net/uip.h"
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PROCESS_NAME(ether_process);
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u8_t simDoSend(void);
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#endif /* __RADIO_ARCH_H__ */
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