📄 packettransceiver.c
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/*****************************************************************************
* *
* ********** *
* ************ *
* *** *** *
* *** +++ *** *
* *** + + *** *
* *** + CHIPCON CC1010 Wireless audio project *
* *** + + *** *
* *** +++ *** PacketTransceiver for the slave unit *
* *** *** *
* *********** *
* ********* *
* *
*****************************************************************************
* This source file is part of a software project for Full Duplex, *
* single-chip, wireless intercom, written for the CC1010 chip *
* (RF-transceiver chip with integrated 8051 micro-controller). *
*****************************************************************************
* Author: OAE *
*****************************************************************************
* Revision history: *
* *
* $Log: PacketTransceiver.c,v $
* Revision 1.2 2003/08/18 12:20:10 tos
* Synchronisation with library update (reentry issue).
*
* Revision 1.1 2003/08/04 12:33:15 tos
* Initial version in CVS.
*
* *
* *
****************************************************************************/
#include <chipcon/reg1010.h>
#include <chipcon/cc1010eb.h>
#include <chipcon/hal.h>
#define WAIT 1
#define DO_NOT_WAIT 0
// External variables
extern RF_RXTXPAIR_CALDATA xdata RF_CALDATA;
extern byte xdata DES_KEY[7];
// Function prototypes
void InitializeDisassembler();
void InitializeAssembler();
byte* DES(byte options, byte xdata* buffer, byte xdata* key,
word length, bit wait);
void ResetReceiveBuffers();
ulong ConfigureTimer23(byte options, ulong period, word clkFreq);
/**************************************************************************
* PacketSend() - Routine for RF-transmission of a single packet *
***************************************************************************
* Description: *
* Used to send a packet using the chosen RF configuration. The RF *
* calibration data must be available. *
***************************************************************************
* Input arguments: *
* byte numpreambles: The number of preamble bytes (alternating ones and *
* zeros) to be sent prior to the synchronization byte. *
* byte xdata *bufferaddress: A pointer to the location (in XRAM) where *
* the first byte of the packet, which is to be sent, is stored. *
* word packetsize: Defines the number of bytes to be sent. *
* RF_RXTXPAIR_SETTINGS* RF_SETTINGS: A pointer to the structure holding *
* the chosen RF RX/TX parameters. *
* Return value; *
* None. *
**************************************************************************/
void PacketSend(byte numpreambles, byte xdata *bufferaddress,
word packetsize, RF_RXTXPAIR_SETTINGS* RF_SETTINGS)
{
// Reset the PacketAssembler (for correct timing)
InitializeAssembler();
// Encrypt the buffered packet before transmission
DES(DES_SINGLE_DES | DES_ENCRYPT | DES_CFB_MODE,
bufferaddress, &DES_KEY, packetsize, DO_NOT_WAIT);
// Prepare for transmission
halRFSetRxTxOff(RF_TX, RF_SETTINGS, &RF_CALDATA);
// Load buffer (RBUF) with the preamble byte
RF_SEND_BYTE(RF_PREAMBLE_BYTE);
// Activate the digital modem and PA
RF_START_TX();
// Send remaining preambles
while(--numpreambles)
RF_WAIT_AND_SEND_BYTE(RF_PREAMBLE_BYTE);
// Send synchronising byte
RF_WAIT_AND_SEND_BYTE(RF_SUITABLE_SYNC_BYTE);
// Send the packet
while(packetsize--)
RF_WAIT_AND_SEND_BYTE(*bufferaddress++);
// Send two extra bytes to empty buffer (RFBUF)
RF_WAIT_AND_SEND_BYTE(0);
RF_WAIT_AND_SEND_BYTE(0);
// End transmission
halRFSetRxTxOff(RF_OFF, NULL, NULL);
}// End function
/**************************************************************************
* PacketReceive() - Routine for RF-reception of a single packet *
***************************************************************************
* Description: *
* Used to receive a packet using the chosen RF configuration. The RF *
* calibration data must be available. *
***************************************************************************
* Input arguments: *
* byte numpreamblebitsense: The number of preamble bits (alternating *
* ones and zeros) that must be received before a synchronization *
* byte is accepted. *
* byte xdata *bufferaddress: A pointer to the location (in XRAM) where *
* the first byte of the packet, which is to be received, is stored. *
* word packetsize: Defines the number of bytes to be received. *
* RF_RXTXPAIR_SETTINGS* RF_SETTINGS: A pointer to the structure holding *
* the chosen RF RX/TX parameters. *
* Return value; *
* None. *
**************************************************************************/
void PacketReceive(byte numpreamblebitsense, byte xdata * bufferaddress,
word packetsize, RF_RXTXPAIR_SETTINGS* RF_SETTINGS)
{
// Save copies of packetsize
word packetsizecopy1 = packetsize;
word packetsizecopy2 = packetsize;
// Save copies of buffer address
byte xdata *bufferaddresscopy1 = bufferaddress;
byte xdata *bufferaddresscopy2 = bufferaddress;
// Define flag for reception timeout indication
bit timeoutflag = 0;
// Prepare for reception
halRFSetRxTxOff(RF_RX, RF_SETTINGS, &RF_CALDATA);
// Configure Timer 2 for timeout detection
halConfigTimer23(TIMER2|TIMER23_NO_INT_TIMER, 6000, CC1010EB_CLKFREQ);
INT_SETFLAG(INUM_TIMER2, INT_CLR);
TIMER2_RUN(TRUE);
// Set the number of preamble bits
RF_SET_PREAMBLE_COUNT(numpreamblebitsense);
// Start reception
RF_START_RX();
// Wait for synch or timeout
while (TRUE)
{
if(INT_GETFLAG(INUM_TIMER2))
{
// Set timeout flag
timeoutflag = 1;
break;
}// End if
// Check if sync byte received
if(RF_BYTE_RECEIVED())
{
// Clear interrupt flag
INT_SETFLAG(INUM_RF, INT_CLR);
break;
}// End if
}// End while
/* Fill buffer with NULL-samples after timeout, and wait
for the next packet */
if (timeoutflag)
{
// Fill buffers with NULL-samples
ResetReceiveBuffers();
// Wait for synch byte
while (!RF_BYTE_RECEIVED());
// Clear interrupt flag
INT_SETFLAG(INUM_RF, INT_CLR);
}// End if
// Receive and buffer a packet after synch byte is received
while(packetsizecopy1--)
RF_WAIT_AND_RECEIVE_BYTE(*bufferaddresscopy1++);
// Perform DES-decryption on the received packet
DES(DES_SINGLE_DES | DES_DECRYPT | DES_CFB_MODE,
bufferaddresscopy2, &DES_KEY, packetsizecopy2, WAIT);
// Reset the PacketDisassembler (ensures correct timing)
InitializeDisassembler();
// Stop timer used for timeout detection
TIMER2_RUN(FALSE);
// Disable the preamble detector
RF_SET_PREAMBLE_COUNT(RF_PREDET_OFF);
// End reception
halRFSetRxTxOff(RF_OFF, NULL, NULL);
}// End function
/**************************************************************************
* AverageFilterUpdate() - Routine for average filter update *
***************************************************************************
* Description: *
* Used to receive a number of preambles (alternating ones and zeros) in *
* order to update the average filter of the RF-receiver. The average *
* filter is free running during update, and locked after completion. *
* The RF calibration data must be available. *
***************************************************************************
* Input arguments: *
* byte numpreamblebitsense: The number of preamble bits (alternating *
* ones and zeros) that must be received before a synchronization *
* byte is accepted. *
* RF_RXTXPAIR_SETTINGS* RF_SETTINGS: A pointer to the structure holding *
* the chosen RF RX/TX parameters. *
* Return value; *
* None. *
**************************************************************************/
void AverageFilterUpdate(byte numpreamblebitsense,
RF_RXTXPAIR_SETTINGS* RF_SETTINGS)
{
// Prepare for reception
halRFSetRxTxOff(RF_RX, RF_SETTINGS, &RF_CALDATA);
// Set the number of preamble bits
RF_SET_PREAMBLE_COUNT(numpreamblebitsense);
// Start reception
RF_START_RX();
// Wait for synch byte (which generate an interrupt)
while (!RF_BYTE_RECEIVED());
// Clear interrupt flag
INT_SETFLAG(INUM_RF, INT_CLR);
// Lock average filter
RF_LOCK_AVERAGE_FILTER(TRUE);
// Disable the preamble detector
RF_SET_PREAMBLE_COUNT(RF_PREDET_OFF);
// End reception
halRFSetRxTxOff(RF_OFF, NULL, NULL);
}// End function
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