__interrupt void PORT1_ISR (void)
{
P1IFG &= ~0x08; ///> P1.3 Interrupt Flag clear
while( P1IN == 0x08 ); ///> debounce on P1.3
McuDelayMillisecond( MODE_SWITCH_DELAY_MS ); ///> 250ms delay to avoid accidental mdoe switch
P1IFG &= ~0x08; ///> P1.3 Interrupt Flag clear
/**
* If edit mode is enabled:
* reset edit mode flag,
* reset empty scan counter,
* reset delay counter,
* print out mode message,
* turn off edit mode LED.
*
*/
if( edit_mode == 1 )
{
edit_mode=0;
empty_scan_cnt = 0;
delay_factor = 0;
UartSendCString("[MODE] Verification Mode");
UartPutCrlf();
LED_14443B_OFF;
}
/**
* If edit mode is disbaled:
* set edit mode flag,
* reset empty scan counter,
* reset delay counter,
* print out mode message.
*
*/
else if( edit_mode == 0 )
{
edit_mode=1;
empty_scan_cnt = 0;
delay_factor = 0;
UartSendCString("[MODE] Edit Mode");
UartPutCrlf();
///> In debug mode, print out all patients currently stored in database
if( DEBUG_MODE == 1 )
{
print_patients();
}
///> turn on edit mode LED
LED_14443B_ON;
}
}
void main(void)
{
// WDT ~350ms, ACLK=1.5kHz, interval timer
WDTCTL = WDT_ADLY_16;
// Enable WDT interrupt
IE1 |= WDTIE;
SLAVE_SELECT_PORT_SET;
SLAVE_SELECT_HIGH;
ENABLE_PORT_SET;
ENABLE_TRF;
// wait until TRF7970A system clock started
McuDelayMillisecond(2);
// settings for communication with TRF7970A
Trf7970CommunicationSetup();
// Set Clock Frequency and Modulation
Trf7970InitialSettings();
// set the DCO to 8 MHz
McuOscSel(1);
// Re-configure the USART with this external clock
Trf7970ReConfig();
// Configure UART
UartSetup();
/************ Smart Medical NFC Scanner Project ************/
McuDelayMillisecond(5);
UartSendCString("[INFO] NFC Reader ENABLED.");
UartPutCrlf();
McuDelayMillisecond(2);
P1SEL &= ~0x08; // Select Port 1 P1.3 (push button)
P1DIR &= ~0x08; // Port 1 P1.3 (push button) as input, 0 is input
P1REN |= 0x08; // Enable Port P1.3 (push button) pull-up resistor
P1IE |= 0x08; // Port 1 Interrupt Enable P1.3 (push button)
P1IFG &= ~0x08; // Clear interrupt flag
/************ Smart Medical NFC Scanner Project ************/
// General enable interrupts
__bis_SR_register(GIE);
// indicates that setting are done
enable = 1;
// stand alone mode
stand_alone_flag = 1;
// launchpad LED1
P1DIR |= BIT0;
//init function for the patient array
init_patient();
P1IN&=BIT3; ///< Port 1.3 (left button) as input as mode switch
while(1)
{
Tag_Count = 0;
IRQ_OFF;
DISABLE_TRF;
// Enter LPM3
__bis_SR_register(LPM3_bits);
// launchpad LED1 - Toggle (heartbeat)
P1OUT ^= BIT0;
// Clear IRQ Flags before enabling TRF7970A
IRQ_CLR;
IRQ_ON;
ENABLE_TRF;
/************ Smart Medical NFC Scanner Project ************/
// Must wait at least 4.8 ms to allow TRF7970A to initialize.
__delay_cycles(40000);
#ifdef ENABLE15693
found_tag_ISO15693 = Iso15693FindTag( edit_mode ); ///< Scan for 15693 tags
#endif
#ifdef ENABLE14443A
found_tag_ISO14443a = Iso14443aFindTag( edit_mode ); ///< Scan for 14443A tags
#endif
/* We are not using 14443B type tag
#ifdef ENABLE14443B
//Iso14443bFindTag(); // Scan for 14443B tags
#endif
*/
/**
* Write total number of tags read to UART
*/
if(Tag_Count > 0){
Tag_Count = UartNibble2Ascii(Tag_Count & 0x0F); ///< convert to ASCII
UartSendCString("[INFO] Tags Found: ");
UartPutChar(Tag_Count);
UartPutCrlf();
UartPutCrlf();
}
/**
* If either type of tag is found:
* reset empty scan counter,
* reset delay factor,
* delay MCU to prevent duplicate scan,
* reset tag found counter for both types of tag.
*
*/
if( ( found_tag_ISO15693 == 1 ) || ( found_tag_ISO14443a == 1 ) )
{
empty_scan_cnt = 0;
delay_factor = 0;
McuDelayMillisecond( SCAN_DELAY_INIT_MS );
found_tag_ISO15693 = 0;
found_tag_ISO14443a = 0;
}
/**
* If edit mode is disabled:
* delay MCU by an increasing amount of time based on
* delay_factor and initial delay,
* increase empty scan counter.
*
*/
if( edit_mode == 0 )
{
//Dynamic delay for power saving
McuDelayMillisecond( delay_factor*SCAN_DELAY_INIT_MS );
//increment empty scan counter
empty_scan_cnt++;
}
/**
* If debug mode is enabled:
* print out empty scan count.
*
*/
if( DEBUG_MODE == 1 )
{
char buf[20];
sprintf( buf, "[DEBUG] Scan#%d\r", empty_scan_cnt );
UartSendCString( buf );
}
/**
* After 20 consecutive empty scan:
* reset empty scan counter,
* increment of delay counter if it's under threshold,
* print out message for additional delay occurrence.
*
*/
if( empty_scan_cnt >= 20 )
{
empty_scan_cnt = 0;
if( delay_factor < 4 )
{
delay_factor++;
UartSendCString( "[DEBUG] No TAG in range, additional 500ms delay added\n" );
}
}
/************ Smart Medical NFC Scanner Project ************/
}
}
void
iso14443bAnticollision(u08_t command, u08_t slots)
{
u08_t i = 0, collision = 0x00, j, found = 0;
u32_t k = 0;
#ifdef ENABLE_HOST
//u08_t rssi[2];
#endif
rx_error_flag = 0x00;
buf[0] = 0x8F;
buf[1] = 0x91;
buf[2] = 0x3D;
buf[3] = 0x00;
buf[4] = 0x30;
buf[5] = 0x05;
buf[6] = 0x00;
if(slots == 0x04)
{
Trf797xEnableSlotCounter();
}
buf[7] = slots;
if(command == 0xB1)
{
buf[7] |= 0x08; // WUPB command else REQB command
}
i_reg = 0x01;
Trf797xRawWrite(&buf[0], 8);
IRQ_CLR; // PORT2 interrupt flag clear
IRQ_ON;
j = 0;
while((i_reg == 0x01) && (j < 2))
{
j++;
McuCounterSet(); // TimerA set
COUNT_VALUE = COUNT_1ms * 2; // 2ms
START_COUNTER;
irq_flag = 0x00;
while(irq_flag == 0x00)
{
}
} // wait for end of TX
i_reg = 0x01;
McuCounterSet(); // TimerA set
COUNT_VALUE = COUNT_1ms * 2; // 2ms
START_COUNTER;
for(i = 1; i < 17; i++)
{
rxtx_state = 1; // the response will be stored in buf[1] upwards
while(i_reg == 0x01) // wait for RX complete
{
k++;
if(k == 0xFFF0)
{
i_reg = 0x00;
rx_error_flag = 0x00;
break;
}
}
if(rx_error_flag == 0x02)
{
i_reg = rx_error_flag;
}
if(i_reg == 0xFF) // recieved SID in buffer
{
if(stand_alone_flag == 1)
{
found = 1;
}
else
{
#ifdef ENABLE_HOST
UartPutChar('[');
for(j = 1; j < rxtx_state; j++)
{
UartPutByte(buf[j]);
}
UartPutChar(']');
//UartPutChar('(');
//UartPutByte(rssi[0]);
//UartPutChar(')');
UartPutCrlf();
#endif
}
}
else if(i_reg == 0x02) // collision occured
{
if(stand_alone_flag == 0)
{
#ifdef ENABLE_HOST
UartPutChar('[');
UartPutChar('z');
UartPutChar(']');
#endif
}
collision = 0x01;
}
else if(i_reg == 0x00) // slot timeout
{
if(stand_alone_flag == 0)
{
#ifdef ENABLE_HOST
//UartPutChar('[');
//UartPutChar(']');
#endif
}
}
else
{
}
if((slots == 0x00) || (slots == 0x01) || (slots == 0x02) || ((slots == 0x04) && (i == 16)))
{
break;
}
iso14443bSlotMarkerCommand(i);
i_reg = 0x01;
if(stand_alone_flag == 0)
{
#ifdef ENABLE_HOST
//UartPutCrlf();
#endif
}
} // for
if(slots == 0x04)
{
Trf797xDisableSlotCounter();
}
IRQ_OFF;
if(remote_flag == 0)
{
if(found == 1)
{
LED_14443B_ON;
}
else
{
LED_14443B_OFF;
}
}
if(collision)
{
iso14443bAnticollision(0x20, 0x02); // Call this function for 16 timeslots
}
} // iso14443bAnticollision