Add thinfilm simulation

armsrc/thinfilm.c

@@ -36,3 +36,117 @@ void ReadThinFilm(void) {
     set_tracing(false);
 }
 
+#define SEC_D 0xf0
+#define SEC_E 0x0f
+#define SEC_F 0x00
+uint16_t FpgaSendQueueDelay;
+
+uint16_t ReadReaderField(void) {
+    uint16_t hf_av = AvgAdc(ADC_CHAN_HF);
+    if (((MAX_ADC_HF_VOLTAGE * hf_av) >> 10) > MAX_ADC_HF_VOLTAGE - 300)
+        hf_av = AvgAdc(ADC_CHAN_HF_RDV40);
+    return hf_av;
+}
+
+static void CodeThinfilmAsTag(const uint8_t *cmd, uint16_t len) {
+    ToSendReset();
+    for (uint16_t i = 0; i < len; i++) {
+        uint8_t b = cmd[i];
+        for (uint8_t j = 0; j < 8; j++) {
+            ToSend[++ToSendMax] = b & 0x80 ? SEC_D : SEC_E;
+            b <<= 1;
+        }
+    }
+    ToSendMax++;
+}
+
+int EmSendCmdThinfilmRaw(uint8_t *resp, uint16_t respLen) {
+    volatile uint8_t b;
+    uint16_t i = 0;
+    uint32_t ThisTransferTime;
+    // wait for the FPGA to signal fdt_indicator == 1 (the FPGA is ready to queue new data in its delay line)
+    for (uint8_t j = 0; j < 5; j++) {    // allow timeout - better late than never
+        while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY));
+        if (AT91C_BASE_SSC->SSC_RHR) break;
+    }
+    while ((ThisTransferTime = GetCountSspClk()) & 0x00000007);
+
+
+    // Clear TXRDY:
+    AT91C_BASE_SSC->SSC_THR = SEC_F;
+
+    // send cycle
+    for (; i < respLen;) {
+        if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+            AT91C_BASE_SSC->SSC_THR = resp[i++];
+            FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
+        }
+
+        if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
+            b = (uint16_t)(AT91C_BASE_SSC->SSC_RHR);
+            (void)b;
+        }
+        if (BUTTON_PRESS()) break;
+    }
+
+    // Ensure that the FPGA Delay Queue is empty
+    uint8_t fpga_queued_bits = FpgaSendQueueDelay >> 3;
+    for (i = 0; i <= fpga_queued_bits / 8 + 1;) {
+        if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+            AT91C_BASE_SSC->SSC_THR = SEC_F;
+            FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
+            i++;
+        }
+    }
+
+    return 0;
+}
+
+void SimulateThinFilm(uint8_t *data, size_t len) {
+    Dbprintf("Simulate %i-bit Thinfilm tag", len * 8);
+    Dbhexdump(len, data, true);
+    int16_t status = PM3_SUCCESS;
+    CodeThinfilmAsTag(data, len);
+
+    FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+    // Set up the synchronous serial port
+    FpgaSetupSsc();
+    // connect Demodulated Signal to ADC:
+    SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+
+    FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_MOD);
+    SpinDelay(100);
+    uint16_t hf_baseline = ReadReaderField();
+
+    // Start the timer
+    StartCountSspClk();
+
+    bool reader_detected = false;
+    LED_A_ON();
+    for (;;) {
+        WDT_HIT();
+        if (BUTTON_PRESS() || data_available()) {
+            status = PM3_EOPABORTED;
+            break;
+        }
+        uint16_t hf_av = ReadReaderField();
+        if (hf_av < hf_baseline)
+            hf_baseline = hf_av;
+        if (hf_av > hf_baseline + 10) {
+            EmSendCmdThinfilmRaw(ToSend, ToSendMax);
+            if (!reader_detected) {
+                LED_B_ON();
+                Dbprintf("Reader detected, start beaming data");
+                reader_detected = true;
+            }
+        } else {
+            if (reader_detected) {
+                LED_B_OFF();
+                Dbprintf("Reader gone, stop beaming data");
+                reader_detected = false;
+            }
+        }
+    }
+    LED_A_OFF();
+    reply_ng(CMD_SIMULATE_TAG_THINFILM, status, NULL, 0);
+}