CHG: the AT91C_BASE_PMC->PMC_PCER has a tendecy to be clear when set with "=", ...

[proxmark3-svn] / armsrc / lfops.c

diff --git a/armsrc/lfops.c b/armsrc/lfops.c
index c80700aeac8fcdc0c218fde12575c2b9debb8f87..f6cbbfba380d572b0a7f7a76ee20bdef54566ed5 100644 (file)
--- a/armsrc/lfops.c
+++ b/armsrc/lfops.c
@@ -91,6 +91,7 @@ void ModThenAcquireRawAdcSamples125k(uint32_t delay_off, uint32_t periods, uint3
 */
 void ReadTItag(void)
 {
+       StartTicks();
        // some hardcoded initial params
        // when we read a TI tag we sample the zerocross line at 2Mhz
        // TI tags modulate a 1 as 16 cycles of 123.2Khz
@@ -216,6 +217,7 @@ void ReadTItag(void)
                        DbpString("Info: CRC is good");
                }
        }
+       StopTicks();
 }
 
 void WriteTIbyte(uint8_t b)
@@ -282,7 +284,7 @@ void AcquireTiType(void)
        HIGH(GPIO_SSC_DOUT);
 
        // Charge TI tag for 50ms.
-       SpinDelay(50);
+       WaitMS(50);
 
        // stop modulating antenna and listen
        LOW(GPIO_SSC_DOUT);
@@ -322,6 +324,7 @@ void AcquireTiType(void)
 // if not provided a valid crc will be computed from the data and written.
 void WriteTItag(uint32_t idhi, uint32_t idlo, uint16_t crc)
 {
+       StartTicks();
        FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
        if(crc == 0) {
                crc = update_crc16(crc, (idlo)&0xff);
@@ -360,7 +363,7 @@ void WriteTItag(uint32_t idhi, uint32_t idlo, uint16_t crc)
 
        // modulate antenna
        HIGH(GPIO_SSC_DOUT);
-       SpinDelay(50);  // charge time
+       WaitMS(50);     // charge time
 
        WriteTIbyte(0xbb); // keyword
        WriteTIbyte(0xeb); // password
@@ -377,7 +380,7 @@ void WriteTItag(uint32_t idhi, uint32_t idlo, uint16_t crc)
        WriteTIbyte(0x00); // write frame lo
        WriteTIbyte(0x03); // write frame hi
        HIGH(GPIO_SSC_DOUT);
-       SpinDelay(50);  // programming time
+       WaitMS(50);     // programming time
 
        LED_A_OFF();
 
@@ -386,35 +389,37 @@ void WriteTItag(uint32_t idhi, uint32_t idlo, uint16_t crc)
 
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
        DbpString("Now use `lf ti read` to check");
+       StopTicks();
 }
 
 void SimulateTagLowFrequency(int period, int gap, int ledcontrol)
 {
        int i = 0;
-       uint8_t *tab = BigBuf_get_addr();
+       uint8_t *buf = BigBuf_get_addr();
 
+       FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
        FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT | FPGA_LF_EDGE_DETECT_READER_FIELD);
 
        AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT | GPIO_SSC_CLK;
        AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;
        AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_CLK;
 
+       StartTicks();
+
        for(;;) {
                WDT_HIT();
 
                if (ledcontrol) LED_D_ON();
                                
-               //wait until SSC_CLK goes HIGH
+               // wait until SSC_CLK goes HIGH
+               // used as a simple detection of a reader field?
                while(!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK)) {
                        WDT_HIT();
-                       if ( usb_poll_validate_length() || BUTTON_PRESS() ) {
-                               FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-                               LED_D_OFF();
-                               return;                         
-                       }
+                       if ( usb_poll_validate_length() || BUTTON_PRESS() )
+                               goto OUT;
                }
                
-               if(tab[i])
+               if(buf[i])
                        OPEN_COIL();
                else
                        SHORT_COIL();
@@ -424,11 +429,8 @@ void SimulateTagLowFrequency(int period, int gap, int ledcontrol)
                //wait until SSC_CLK goes LOW
                while(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK) {
                        WDT_HIT();
-                       if ( usb_poll_validate_length() || BUTTON_PRESS() ) {
-                               FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-                               LED_D_OFF();
-                               return;                         
-                       }
+                       if ( usb_poll_validate_length() || BUTTON_PRESS() )
+                               goto OUT;
                }
 
                i++;
@@ -441,6 +443,11 @@ void SimulateTagLowFrequency(int period, int gap, int ledcontrol)
                        }
                }
        }
+OUT: 
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+       StopTicks();
+       LED_D_OFF();
+       return; 
 }
 
 #define DEBUG_FRAME_CONTENTS 1