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This version code now reads a TI tag properly.

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This commit is contained in:
d18c7db 2009-07-20 10:36:33 +00:00
commit 8e7a6ce409
5 changed files with 87275 additions and 8396 deletions
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66
armsrc/appmain.c
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@ -206,23 +206,22 @@ void ModThenAcquireRawAdcSamples125k(int delay_off,int period_0,int period_1,BYT
DoAcquisition125k(at134khz);
}
//-----------------------------------------------------------------------------
// Read a TI-type tag. We assume that the tag has already been illuminated,
// and that the exciting signal has been turned off. That means that we just
// acquire the `one-bit DAC' bits from the comparator.
//-----------------------------------------------------------------------------
void AcquireTiType(void)
{
int i;
int n = sizeof(BigBuf);
int n = 5000;
// clear buffer
memset(BigBuf,0,sizeof(BigBuf));
// Set up the synchronous serial port
// Set up the synchronous serial port
PIO_DISABLE = (1<<GPIO_SSC_DIN);
PIO_PERIPHERAL_A_SEL = (1<<GPIO_SSC_DIN);
// steal this pin from the SSP and use it to control the modulation
PIO_ENABLE = (1<<GPIO_SSC_DOUT);
PIO_OUTPUT_ENABLE = (1<<GPIO_SSC_DOUT);
SSC_CONTROL = SSC_CONTROL_RESET;
SSC_CONTROL = SSC_CONTROL_RX_ENABLE | SSC_CONTROL_TX_ENABLE;
@ -231,18 +230,35 @@ void AcquireTiType(void)
SSC_CLOCK_DIVISOR = 12;
SSC_RECEIVE_CLOCK_MODE = SSC_CLOCK_MODE_SELECT(0);
SSC_RECEIVE_FRAME_MODE = SSC_FRAME_MODE_BITS_IN_WORD(32) | SSC_FRAME_MODE_MSB_FIRST;
SSC_TRANSMIT_CLOCK_MODE = 0;
SSC_TRANSMIT_FRAME_MODE = 0;
SSC_RECEIVE_FRAME_MODE = SSC_FRAME_MODE_BITS_IN_WORD(32) | SSC_FRAME_MODE_MSB_FIRST;
SSC_TRANSMIT_CLOCK_MODE = 0;
SSC_TRANSMIT_FRAME_MODE = 0;
i = 0;
for(;;) {
if(SSC_STATUS & SSC_STATUS_RX_READY) {
BigBuf[i] = SSC_RECEIVE_HOLDING; // store 32 bit values in buffer
i++; if(i >= n) return;
}
WDT_HIT();
}
LED_D_ON();
// modulate antenna
PIO_OUTPUT_DATA_SET = (1<<GPIO_SSC_DOUT);
// Charge TI tag for 50ms.
SpinDelay(50);
// stop modulating antenna and listen
PIO_OUTPUT_DATA_CLEAR = (1<<GPIO_SSC_DOUT);
LED_D_OFF();
i = 0;
for(;;) {
if(SSC_STATUS & SSC_STATUS_RX_READY) {
BigBuf[i] = SSC_RECEIVE_HOLDING; // store 32 bit values in buffer
i++; if(i >= n) return;
}
WDT_HIT();
}
// return stolen pin ro SSP
PIO_DISABLE = (1<<GPIO_SSC_DOUT);
PIO_PERIPHERAL_A_SEL = (1<<GPIO_SSC_DIN) | (1<<GPIO_SSC_DOUT);
}
void AcquireRawBitsTI(void)
@ -250,22 +266,16 @@ void AcquireRawBitsTI(void)
LED_D_ON();
// TI tags charge at 134.2Khz
FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz
FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);
// Charge TI tag for 50ms.
SpinDelay(50);
LED_D_OFF();
LED_A_ON();
// Place FPGA in passthrough mode so as to stop driving the LF coil,
// in this mode the CROSS_LO line connects to SSP_DIN
// Place FPGA in passthrough mode, in this mode the CROSS_LO line
// connects to SSP_DIN and the SSP_DOUT logic level controls
// whether we're modulating the antenna (high)
// or listening to the antenna (low)
FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_PASSTHRU);
// get TI tag data into the buffer
AcquireTiType();
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
LED_A_OFF();
}
//-----------------------------------------------------------------------------