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hw41_D41.c
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hw41_D41.c
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/* See license.txt for license information. */
//******************************************************************************
// WISP 4.1
// Device: MSP430-2132
//
// Version HW4.1_SW6.0
//
// Pinout:
// P1.1 = Data out signal
// P1.2 = Data in signal
// P1.3 = Data in enable
//
// P2.4 = Supervisor In
// P2.5 = Supervisor In
//
// Tested against Impinj v 3.0.2 reader, Miller-4 encodings
// Alien reader code is out of date
//
// This is a partial implementation of the RFID EPCGlobal C1G2 protocol
// for the WISP 4.1 hardware platform.
//
// What's missing:
// - SECURED and KILLED states.
// - No support for WRITE, KILL, LOCK, ACCESS, BLOCKWRITE and BLOCKERASE
// commands.
// - Commands with EBVs always assume that the field is 8 bits long.
// - SELECTS don't support truncation.
// - READs ignore membank, wordptr, and wordcount fields. (What READs do
// return is dependent on what application you have configured in step
// 1.)
// - I sometimes get erroneous-looking session values in QUERYREP
// commands. For the time being, I just parse the command as if the
// session value is the same as my previous_session value.
// - QUERYs use a pretty aggressive slotting algorithm to preserve power.
// See the comments in that function for details.
// - Session timeouts work differently than what's in table 6.15 of the
// spec. Here's what we do:
// SL comes up as not asserted, and persists as long as it's in ram
// retention mode or better.
// All inventory flags come up as 'A'. S0's inventory flag persists
// as long as it's in ram retention mode or better. S1's inventory
// flag persists as long as it's in an inventory round and in ram
// retention mode or better; otherwise it is reset to 'A' with every
// reset at the top of the while loop. S2's and S3's inventory flag
// is reset to 'A' with every reset at the top of the while loop.
//******************************************************************************
#if(WISP_VERSION != BLUE_WISP)
#error "WISP Version not supported"
#endif
#include "dlwisp41.h"
#include "rfid.h"
/*******************************************************************************
***************** Edit mywisp.h to configure this WISP **********************
******************************************************************************/
#include "mywisp.h"
// as per mapping in monitor code
#define wisp_debug_1 DEBUG_1_4 // P1.4
#define wisp_debug_2 DEBUG_2_3 // P2.3
#define wisp_debug_3 CLK_A // P3.0
#define wisp_debug_4 TX_A // P3.4
#define wisp_debug_5 RX_A // P3.5
#define MONITOR_DEBUG_ON 0
volatile unsigned char* destorig = &cmd[0]; // pointer to beginning of cmd
// #pragma data_alignment=2 is important in sendResponse() when the words are
// copied into arrays. Sometimes the compiler puts reply[0] on an odd address,
// which cannot be copied as a word and thus screws everything up.
#pragma data_alignment=2
// compiler uses working register 4 as a global variable
// Pointer to &cmd[bits]
volatile __no_init __regvar unsigned char* dest @ 4;
// compiler uses working register 5 as a global variable
// count of bits received from reader
volatile __no_init __regvar unsigned short bits @ 5;
unsigned short TRcal=0;
#if ENABLE_SESSIONS
// selected and session inventory flags
#define S0_INDEX 0x00
#define S1_INDEX 0x01
#define S2_INDEX 0x02
#define S3_INDEX 0x03
#define SL_ASSERTED 1
#define SL_NOT_ASSERTED 0
#define SESSION_STATE_A 0
#define SESSION_STATE_B 1
unsigned char SL;
unsigned char previous_session = 0x00;
unsigned char session_table[] = {
SESSION_STATE_A, SESSION_STATE_A,
SESSION_STATE_A, SESSION_STATE_A
};
#endif // ENABLE_SESSIONS
int i;
int main(void)
{
//*******************************Timer setup**********************************
WDTCTL = WDTPW + WDTHOLD; // Stop Watchdog Timer
P1SEL = 0;
P2SEL = 0;
P1IE = 0;
P1IFG = 0;
P2IFG = 0;
DRIVE_ALL_PINS // set pin directions correctly and outputs to low.
// Check power on bootup, decide to receive or sleep.
if(!is_power_good())
sleep();
RECEIVE_CLOCK;
/*
// already set.
#if MONITOR_DEBUG_ON
// for monitor - pin direction
P1DIR |= wisp_debug_1;
P2DIR |= wisp_debug_2;
P3DIR |= wisp_debug_3;
P3DIR |= wisp_debug_4;
P3DIR |= wisp_debug_5;
#endif
*/
#if DEBUG_PINS_ENABLED
#if USE_2132
DEBUG_PIN5_LOW;
// P3DIR |= (BIT5); // already set.
#else
P4DIR |= (BIT7+BIT5+BIT3);
#endif
#endif
#if ENABLE_SLOTS
// setup int epc
epc = ackReply[2]<<8;
epc |= ackReply[3];
// calculate RN16_1 table
for (Q = 0; Q < 16; Q++)
{
rn16 = epc^Q;
lfsr();
if (Q > 8)
{
RN16[(Q<<1)-9] = __swap_bytes(rn16);
RN16[(Q<<1)-8] = rn16;
}
else
{
RN16[Q] = rn16;
}
}
#endif
TACTL = 0;
// P1IES &= ~BIT2; // initial state is POS edge to find start of CW
// P1IFG = 0x00; // clear interrupt flag after changing edge trigger
asm("MOV #0000h, R9");
// dest = destorig;
#if READ_SENSOR
init_sensor();
#endif
#if !(ENABLE_SLOTS)
queryReplyCRC = crc16_ccitt(&queryReply[0],2);
queryReply[3] = (unsigned char)queryReplyCRC;
queryReply[2] = (unsigned char)__swap_bytes(queryReplyCRC);
#endif
#if SENSOR_DATA_IN_ID
// this branch is for sensor data in the id
ackReply[2] = SENSOR_DATA_TYPE_ID;
state = STATE_READ_SENSOR;
timeToSample++;
#else
ackReplyCRC = crc16_ccitt(&ackReply[0], 14);
ackReply[15] = (unsigned char)ackReplyCRC;
ackReply[14] = (unsigned char)__swap_bytes(ackReplyCRC);
#endif
#if ENABLE_SESSIONS
initialize_sessions();
#endif
//state = STATE_ARBITRATE;
state = STATE_READY;
#if MONITOR_DEBUG_ON
// for monitor - set STATE READY debug line - 00000 - 0
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT &= ~wisp_debug_2;
#endif
setup_to_receive();
while (1)
{
// TIMEOUT! reset timer
if (TAR > 0x256 || delimiterNotFound) // was 0x1000
{
if(!is_power_good()) {
sleep();
}
#if MONITOR_DEBUG_ON
// for monitor - set TAR OVERFLOW debug line - 00111 - 7
if (!delimiterNotFound)
{
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT &= ~wisp_debug_2;
P3OUT = 0x31;
}
#endif
#if SENSOR_DATA_IN_ID
// this branch is for sensor data in the id
if ( timeToSample++ == 10 ) {
state = STATE_READ_SENSOR;
timeToSample = 0;
}
#elif SENSOR_DATA_IN_READ_COMMAND
if ( timeToSample++ == 10 ) {
state = STATE_READ_SENSOR;
timeToSample = 0;
}
#else
#if !(ENABLE_READS)
if(!is_power_good())
sleep();
#endif
inInventoryRound = 0;
state = STATE_READY;
#if MONITOR_DEBUG_ON
// for monitor - set STATE READY debug line - 00000 - 0
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT &= ~wisp_debug_2;
#endif
#endif
#if ENABLE_SESSIONS
handle_session_timeout();
#endif
#if ENABLE_SLOTS
if (shift < 4)
shift += 1;
else
shift = 0;
#endif
setup_to_receive();
}
switch (state)
{
case STATE_READY:
{
inInventoryRound = 0;
//////////////////////////////////////////////////////////////////////
// process the QUERY command
//////////////////////////////////////////////////////////////////////
if ( bits == NUM_QUERY_BITS && ( ( cmd[0] & 0xF0 ) == 0x80 ) )
{
#if MONITOR_DEBUG_ON
// for monitor - set QUERY PKT debug line - 01001 - 9
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT |= wisp_debug_2;
P3OUT = 0x01;
#endif
//DEBUG_PIN5_HIGH;
handle_query(STATE_REPLY);
#if MONITOR_DEBUG_ON
// for monitor - set STATE REPLY debug line - 00010 - 2
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT &= ~wisp_debug_2;
P3OUT = 0x10;
#endif
setup_to_receive();
}
//////////////////////////////////////////////////////////////////////
// process the SELECT command
//////////////////////////////////////////////////////////////////////
// @ short distance has slight impact on performance
else if ( bits >= 44 && ( ( cmd[0] & 0xF0 ) == 0xA0 ) )
{
#if MONITOR_DEBUG_ON
// for monitor - set QUERY_ADJ debug line - 01101 - 13
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT |= wisp_debug_2;
P3OUT = 0x30;
#endif
//DEBUG_PIN5_HIGH;
handle_select(STATE_READY);
//DEBUG_PIN5_LOW;
delimiterNotFound = 1;
} // select command
//////////////////////////////////////////////////////////////////////
// got >= 22 bits, and it's not the beginning of a select. just reset.
//////////////////////////////////////////////////////////////////////
else if ( bits >= MAX_NUM_QUERY_BITS && ( ( cmd[0] & 0xF0 ) != 0xA0 ) )
{
do_nothing();
state = STATE_READY;
delimiterNotFound = 1;
#if MONITOR_DEBUG_ON
// for monitor - set debug line - 01110 - 14
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT &= ~wisp_debug_2;
P3OUT = 0x30;
#endif
}
break;
}
case STATE_ARBITRATE:
{
//////////////////////////////////////////////////////////////////////
// process the QUERY command
//////////////////////////////////////////////////////////////////////
if ( bits == NUM_QUERY_BITS && ( ( cmd[0] & 0xF0 ) == 0x80 ) )
{
#if MONITOR_DEBUG_ON
// for monitor - set QUERY PKT debug line - 01001 - 9
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT |= wisp_debug_2;
P3OUT = 0x01;
#endif
//DEBUG_PIN5_HIGH;
handle_query(STATE_REPLY);
#if MONITOR_DEBUG_ON
// for monitor - set STATE REPLY debug line - 00010 - 2
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT &= ~wisp_debug_2;
P3OUT = 0x10;
#endif
setup_to_receive();
}
//////////////////////////////////////////////////////////////////////
// got >= 22 bits, and it's not the beginning of a select. just reset.
//////////////////////////////////////////////////////////////////////
//else if ( bits >= NUM_QUERY_BITS )
else if ( bits >= MAX_NUM_QUERY_BITS && ( ( cmd[0] & 0xF0 ) != 0xA0 ) )
{
//DEBUG_PIN5_HIGH;
do_nothing();
state = STATE_READY;
delimiterNotFound = 1;
#if MONITOR_DEBUG_ON
// for monitor - set DELIMITER NOT FOUND debug line - 00110 - 6
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT &= ~wisp_debug_2;
P3OUT = 0x30;
#endif
//DEBUG_PIN5_LOW;
}
// this state handles query, queryrep, queryadjust, and select commands.
//////////////////////////////////////////////////////////////////////
// process the QUERYREP command
//////////////////////////////////////////////////////////////////////
else if ( bits == NUM_QUERYREP_BITS && ( ( cmd[0] & 0x06 ) == 0x00 ) )
{
#if MONITOR_DEBUG_ON
// for monitor - set QUERY_REP debug line - 01100 - 12
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT |= wisp_debug_2;
P3OUT = 0x20;
#endif
//DEBUG_PIN5_HIGH;
handle_queryrep(STATE_REPLY);
//DEBUG_PIN5_LOW;
//setup_to_receive();
delimiterNotFound = 1;
#if MONITOR_DEBUG_ON
// for monitor - set DELIMITER NOT FOUND debug line - 00110 - 6
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT &= ~wisp_debug_2;
P3OUT = 0x30;
#endif
} // queryrep command
//////////////////////////////////////////////////////////////////////
// process the QUERYADJUST command
//////////////////////////////////////////////////////////////////////
else if ( bits == NUM_QUERYADJ_BITS && ( ( cmd[0] & 0xF8 ) == 0x48 ) )
{
// at short distance, you get better performance (~52 t/s) if you
// do setup_to_receive() rather than dnf =1. not sure that this holds
// true at distance though - need to recheck @ 2-3 ms.
//DEBUG_PIN5_HIGH;
#if MONITOR_DEBUG_ON
// for monitor - set QUERY_ADJ debug line - 01101 - 13
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT |= wisp_debug_2;
P3OUT = 0x21;
#endif
handle_queryadjust(STATE_REPLY);
//DEBUG_PIN5_LOW;
setup_to_receive();
//delimiterNotFound = 1;
} // queryadjust command
//////////////////////////////////////////////////////////////////////
// process the SELECT command
//////////////////////////////////////////////////////////////////////
// @ short distance has slight impact on performance
else if ( bits >= 44 && ( ( cmd[0] & 0xF0 ) == 0xA0 ) )
{
#if MONITOR_DEBUG_ON
// for monitor - set SELECT debug line - 01110 - 14
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT |= wisp_debug_2;
P3OUT = 0x30;
#endif
//DEBUG_PIN5_HIGH;
handle_select(STATE_READY);
//DEBUG_PIN5_LOW;
delimiterNotFound = 1;
#if MONITOR_DEBUG_ON
// for monitor - set DELIMITER NOT FOUND debug line - 00110 - 6
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT &= ~wisp_debug_2;
P3OUT = 0x30;
#endif
} // select command
break;
}
case STATE_REPLY:
{
// this state handles query, query adjust, ack, and select commands
///////////////////////////////////////////////////////////////////////
// process the ACK command
///////////////////////////////////////////////////////////////////////
if ( bits == NUM_ACK_BITS && ( ( cmd[0] & 0xC0 ) == 0x40 ) )
{
#if MONITOR_DEBUG_ON
// for monitor - set ACK PKT debug line - 01010 - 10
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT |= wisp_debug_2;
P3OUT = 0x10;
#endif
#if ENABLE_READS
handle_ack(STATE_ACKNOWLEDGED);
setup_to_receive();
#elif SENSOR_DATA_IN_ID
handle_ack(STATE_ACKNOWLEDGED);
delimiterNotFound = 1; // reset
#else
// this branch for hardcoded query/acks
handle_ack(STATE_ACKNOWLEDGED);
//delimiterNotFound = 1; // reset
setup_to_receive();
#endif
#if MONITOR_DEBUG_ON
// for monitor - set STATE ACK debug line - 00011 - 3
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT &= ~wisp_debug_2;
P3OUT = 0x11;
#endif
}
//////////////////////////////////////////////////////////////////////
// process the QUERY command
//////////////////////////////////////////////////////////////////////
if ( bits == NUM_QUERY_BITS && ( ( cmd[0] & 0xF0 ) == 0x80 ) )
{
#if MONITOR_DEBUG_ON
// for monitor - set QUERY PKT debug line - 01001 - 9
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT |= wisp_debug_2;
P3OUT = 0x01;
#endif
// i'm supposed to stay in state_reply when I get this, but if I'm
// running close to 1.8v then I really need to reset and get in the
// sleep, which puts me back into state_arbitrate. this is complete
// a violation of the protocol, but it sure does make everything
// work better. - polly 8/9/2008
//DEBUG_PIN5_HIGH;
handle_query(STATE_REPLY);
//DEBUG_PIN5_LOW;
//delimiterNotFound = 1;
setup_to_receive();
}
//////////////////////////////////////////////////////////////////////
// process the QUERYREP command
//////////////////////////////////////////////////////////////////////
else if ( bits == NUM_QUERYREP_BITS && ( ( cmd[0] & 0x06 ) == 0x00 ) )
{
#if MONITOR_DEBUG_ON
// for monitor - set QUERY_REP debug line - 01100 - 12
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT |= wisp_debug_2;
P3OUT = 0x20;
#endif
//DEBUG_PIN5_HIGH;
do_nothing();
state = STATE_ARBITRATE;
#if MONITOR_DEBUG_ON
// for monitor - set STATE ARBITRATE debug line - 00001 - 1
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT &= ~wisp_debug_2;
P3OUT = 0x01;
#endif
//handle_queryrep(STATE_ARBITRATE);
//DEBUG_PIN5_LOW;
setup_to_receive();
//delimiterNotFound = 1; // reset
} // queryrep command
//////////////////////////////////////////////////////////////////////
// process the QUERYADJUST command
//////////////////////////////////////////////////////////////////////
else if (bits == NUM_QUERYADJ_BITS && ( ( cmd[0] & 0xF8 ) == 0x48 ))
{
#if MONITOR_DEBUG_ON
// for monitor - set QUERY_ADJ debug line - 01101 - 13
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT |= wisp_debug_2;
P3OUT = 0x21;
#endif
//DEBUG_PIN5_HIGH;
handle_queryadjust(STATE_REPLY);
//DEBUG_PIN5_LOW;
//setup_to_receive();
delimiterNotFound = 1;
#if MONITOR_DEBUG_ON
// for monitor - set DELIMITER NOT FOUND debug line - 00110 - 6
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT &= ~wisp_debug_2;
P3OUT = 0x30;
#endif
} // queryadjust command
//////////////////////////////////////////////////////////////////////
// process the SELECT command
//////////////////////////////////////////////////////////////////////
else if ( bits >= 44 && ( ( cmd[0] & 0xF0 ) == 0xA0 ) )
{
#if MONITOR_DEBUG_ON
// for monitor - set SELECT debug line - 01110 - 14
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT |= wisp_debug_2;
P3OUT = 0x30;
#endif
//DEBUG_PIN5_HIGH;
handle_select(STATE_READY);
//DEBUG_PIN5_LOW;
delimiterNotFound = 1;
#if MONITOR_DEBUG_ON
// for monitor - set DELIMITER NOT FOUND debug line - 00110 - 6
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT &= ~wisp_debug_2;
P3OUT = 0x30;
#endif
//setup_to_receive();
} // select command
else if ( bits >= MAX_NUM_QUERY_BITS && ( ( cmd[0] & 0xF0 ) != 0xA0 ) &&
( ( cmd[0] & 0xF0 ) != 0x80 ) )
{
//DEBUG_PIN5_HIGH;
do_nothing();
state = STATE_READY;
delimiterNotFound = 1;
//DEBUG_PIN5_LOW;
}
break;
}
case STATE_ACKNOWLEDGED:
{
// responds to query, ack, request_rn cmds
// takes action on queryrep, queryadjust, and select cmds
/////////////////////////////////////////////////////////////////////
// process the REQUEST_RN command
//////////////////////////////////////////////////////////////////////
if ( bits >= NUM_REQRN_BITS && ( cmd[0] == 0xC1 ) )
{
#if 1
#if MONITOR_DEBUG_ON
// for monitor - set REQ_RN debug line - 01011 - 11
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT |= wisp_debug_2;
P3OUT = 0x11;
#endif
DEBUG_PIN5_HIGH;
handle_request_rn(STATE_OPEN);
DEBUG_PIN5_LOW;
setup_to_receive();
#else
handle_request_rn(STATE_READY);
delimiterNotFound = 1;
#if MONITOR_DEBUG_ON
// for monitor - set DELIMITER NOT FOUND debug line - 00110 - 6
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT &= ~wisp_debug_2;
P3OUT = 0x30;
#endif
#endif
}
#if 1
//////////////////////////////////////////////////////////////////////
// process the QUERY command
//////////////////////////////////////////////////////////////////////
if ( bits == NUM_QUERY_BITS && ( ( cmd[0] & 0xF0 ) == 0x80 ) )
{
#if MONITOR_DEBUG_ON
// for monitor - set QUERY PKT debug line - 01001 - 9
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT |= wisp_debug_2;
P3OUT = 0x01;
#endif
//DEBUG_PIN5_HIGH;
handle_query(STATE_REPLY);
//DEBUG_PIN5_LOW;
delimiterNotFound = 1;
#if MONITOR_DEBUG_ON
// for monitor - set DELIMITER NOT FOUND debug line - 00110 - 6
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT &= ~wisp_debug_2;
P3OUT = 0x30;
#endif
//setup_to_receive();
}
///////////////////////////////////////////////////////////////////////
// process the ACK command
///////////////////////////////////////////////////////////////////////
// this code doesn't seem to get exercised in the real world. if i ever
// ran into a reader that generated an ack in an acknowledged state,
// this code might need some work.
//else if ( bits == 20 && ( ( cmd[0] & 0xC0 ) == 0x40 ) )
else if ( bits == NUM_ACK_BITS && ( ( cmd[0] & 0xC0 ) == 0x40 ) )
{
#if MONITOR_DEBUG_ON
// for monitor - set ACK PKT debug line - 01010 - 10
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT |= wisp_debug_2;
P3OUT = 0x10;
#endif
//DEBUG_PIN5_HIGH;
handle_ack(STATE_ACKNOWLEDGED);
#if MONITOR_DEBUG_ON
// for monitor - set STATE ACK debug line - 00011 - 3
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT &= ~wisp_debug_2;
P3OUT = 0x11;
#endif
//DEBUG_PIN5_LOW;
setup_to_receive();
}
//////////////////////////////////////////////////////////////////////
// process the QUERYREP command
//////////////////////////////////////////////////////////////////////
else if ( bits == NUM_QUERYREP_BITS && ( ( cmd[0] & 0x06 ) == 0x00 ) )
{
// in the acknowledged state, rfid chips don't respond to queryrep
// commands
do_nothing();
state = STATE_READY;
delimiterNotFound = 1;
} // queryrep command
//////////////////////////////////////////////////////////////////////
// process the QUERYADJUST command
//////////////////////////////////////////////////////////////////////
else if ( bits == NUM_QUERYADJ_BITS && ( ( cmd[0] & 0xF8 ) == 0x48 ) )
{
//DEBUG_PIN5_HIGH;
do_nothing();
state = STATE_READY;
delimiterNotFound = 1;
//DEBUG_PIN5_LOW;
} // queryadjust command
//////////////////////////////////////////////////////////////////////
// process the SELECT command
//////////////////////////////////////////////////////////////////////
else if ( bits >= 44 && ( ( cmd[0] & 0xF0 ) == 0xA0 ) )
{
//DEBUG_PIN5_HIGH;
handle_select(STATE_READY);
delimiterNotFound = 1;
//DEBUG_PIN5_LOW;
} // select command
//////////////////////////////////////////////////////////////////////
// process the NAK command
//////////////////////////////////////////////////////////////////////
else if ( bits >= 10 && ( cmd[0] == 0xC0 ) )
//else if ( bits >= NUM_NAK_BITS && ( cmd[0] == 0xC0 ) )
{
//DEBUG_PIN5_HIGH;
do_nothing();
state = STATE_ARBITRATE;
delimiterNotFound = 1;
//DEBUG_PIN5_LOW;
}
//////////////////////////////////////////////////////////////////////
// process the READ command
//////////////////////////////////////////////////////////////////////
// warning: won't work for read addrs > 127d
if ( bits == NUM_READ_BITS && ( cmd[0] == 0xC2 ) )
{
//DEBUG_PIN5_HIGH;
handle_read(STATE_ARBITRATE);
state = STATE_ARBITRATE;
delimiterNotFound = 1 ;
//DEBUG_PIN5_LOW;
}
// FIXME: need write, kill, lock, blockwrite, blockerase
//////////////////////////////////////////////////////////////////////
// process the ACCESS command
//////////////////////////////////////////////////////////////////////
if ( bits >= 56 && ( cmd[0] == 0xC6 ) )
{
//DEBUG_PIN5_HIGH;
do_nothing();
state = STATE_ARBITRATE;
delimiterNotFound = 1 ;
//DEBUG_PIN5_LOW;
}
#endif
else if ( bits >= MAX_NUM_READ_BITS )
{
//DEBUG_PIN5_HIGH;
//do_nothing();
state = STATE_ARBITRATE;
delimiterNotFound = 1 ;
//DEBUG_PIN5_LOW;
}
#if 0
// kills performance ...
else if ( bits >= 44 )
{
do_nothing();
state = STATE_ARBITRATE;
delimiterNotFound = 1;
}
#endif
break;
}
case STATE_OPEN:
{
// responds to query, ack, req_rn, read, write, kill, access,
// blockwrite, and blockerase cmds
// processes queryrep, queryadjust, select cmds
//////////////////////////////////////////////////////////////////////
// process the READ command
//////////////////////////////////////////////////////////////////////
// warning: won't work for read addrs > 127d
if ( bits == NUM_READ_BITS && ( cmd[0] == 0xC2 ) )
{
//DEBUG_PIN5_HIGH;
handle_read(STATE_OPEN);
//DEBUG_PIN5_LOW;
// note: setup_to_receive() et al handled in handle_read
}
//////////////////////////////////////////////////////////////////////
// process the REQUEST_RN command
//////////////////////////////////////////////////////////////////////
else if ( bits >= NUM_REQRN_BITS && ( cmd[0] == 0xC1 ) )
//else if ( bits >= 30 && ( cmd[0] == 0xC1 ) )
{
handle_request_rn(STATE_OPEN);
setup_to_receive();
//delimiterNotFound = 1; // more bad reads??
}
//////////////////////////////////////////////////////////////////////
// process the QUERY command
//////////////////////////////////////////////////////////////////////
if ( bits == NUM_QUERY_BITS && ( ( cmd[0] & 0xF0 ) == 0x80 ) )
{
handle_query(STATE_REPLY);
//setup_to_receive();
delimiterNotFound = 1;
}
//////////////////////////////////////////////////////////////////////
// process the QUERYREP command
//////////////////////////////////////////////////////////////////////
else if ( bits == NUM_QUERYREP_BITS && ( ( cmd[0] & 0x06 ) == 0x00 ) )
{
//DEBUG_PIN5_HIGH;
do_nothing();
state = STATE_READY;
//delimiterNotFound = 1;
setup_to_receive();
//DEBUG_PIN5_LOW;
} // queryrep command
//////////////////////////////////////////////////////////////////////
// process the QUERYADJUST command
//////////////////////////////////////////////////////////////////////
//else if ( bits == NUM_QUERYADJ_BITS && ( ( cmd[0] & 0xF0 ) == 0x90 ) )
else if ( bits == 9 && ( ( cmd[0] & 0xF8 ) == 0x48 ) )
{
//DEBUG_PIN5_HIGH;
do_nothing();
state = STATE_READY;
delimiterNotFound = 1;
//DEBUG_PIN5_LOW;
} // queryadjust command
///////////////////////////////////////////////////////////////////////
// process the ACK command
///////////////////////////////////////////////////////////////////////
else if ( bits == NUM_ACK_BITS && ( ( cmd[0] & 0xC0 ) == 0x40 ) )
{
//DEBUG_PIN5_HIGH;
handle_ack(STATE_OPEN);
//setup_to_receive();
delimiterNotFound = 1;
//DEBUG_PIN5_LOW;
}
//////////////////////////////////////////////////////////////////////
// process the SELECT command
//////////////////////////////////////////////////////////////////////
else if ( bits >= 44 && ( ( cmd[0] & 0xF0 ) == 0xA0 ) )
{
handle_select(STATE_READY);
delimiterNotFound = 1;
} // select command
//////////////////////////////////////////////////////////////////////
// process the NAK command
//////////////////////////////////////////////////////////////////////
//else if ( bits >= NUM_NAK_BITS && ( cmd[0] == 0xC0 ) )
else if ( bits >= 10 && ( cmd[0] == 0xC0 ) )
{
handle_nak(STATE_ARBITRATE);
delimiterNotFound = 1;
}
break;
}
case STATE_READ_SENSOR:
{
#if SENSOR_DATA_IN_READ_COMMAND
read_sensor(&readReply[0]);
// crc is computed in the read state
RECEIVE_CLOCK;
state = STATE_READY;
delimiterNotFound = 1; // reset
#elif SENSOR_DATA_IN_ID
read_sensor(&ackReply[3]);
RECEIVE_CLOCK;
ackReplyCRC = crc16_ccitt(&ackReply[0], 14);
ackReply[15] = (unsigned char)ackReplyCRC;
ackReply[14] = (unsigned char)__swap_bytes(ackReplyCRC);
state = STATE_READY;
delimiterNotFound = 1; // reset
#endif
break;
} // end case
} // end switch
} // while loop
}
//************************** SETUP TO RECEIVE *********************************
// note: port interrupt can also reset, but it doesn't call this function
// because function call causes PUSH instructions prior to bit read
// at beginning of interrupt, which screws up timing. so, remember
// to change things in both places.
inline void setup_to_receive()
{
//P4OUT &= ~BIT3;
_BIC_SR(GIE); // temporarily disable GIE so we can sleep and enable interrupts
// at the same time
P1OUT |= RX_EN_PIN;
delimiterNotFound = 0;
// setup port interrupt on pin 1.2
P1SEL &= ~BIT2; //Disable TimerA2, so port interrupt can be used
// Setup timer. It has to setup because there is no setup time after done with
// port1 interrupt.
TACTL = 0;
TAR = 0;
TACCR0 = 0xFFFF; // Set up TimerA0 register as Max
TACCTL0 = 0;
TACCTL1 = SCS + CAP; //Synchronize capture source and capture mode
TACTL = TASSEL1 + MC1 + TAIE; // SMCLK and continuous mode and Timer_A
// interrupt enabled.
// initialize bits
bits = 0;
// initialize dest
dest = destorig; // = &cmd[0]
// clear R6 bits of word counter from prior communications to prevent dest++
// on 1st port interrupt
asm("CLR R6");
P1IE = 0;
P1IES &= ~RX_PIN; // Make positive edge for port interrupt to detect start of
// delimiter
P1IFG = 0; // Clear interrupt flag
P1IE |= RX_PIN; // Enable Port1 interrupt
_BIS_SR(LPM4_bits | GIE);
return;
}
inline void sleep()
{
P1OUT &= ~RX_EN_PIN;
#if MONITOR_DEBUG_ON
// for monitor - set SLEEP debug line - 01000 - 8
P1OUT |= wisp_debug_1;
P1OUT &= ~wisp_debug_1;
P2OUT |= wisp_debug_2;
P3OUT = 0x00;
#endif
// enable port interrupt for voltage supervisor
P2IES = 0;
P2IFG = 0;
P2IE |= VOLTAGE_SV_PIN;
P1IE = 0;
P1IFG = 0;
TACTL = 0;
_BIC_SR(GIE); // temporarily disable GIE so we can sleep and enable interrupts
// at the same time
P2IE |= VOLTAGE_SV_PIN; // Enable Port2 interrupt
if (is_power_good())
P2IFG = VOLTAGE_SV_PIN;