iso14444a: minor FPGA bugfix

[proxmark3-svn] / armsrc / fpgaloader.c

diff --git a/armsrc/fpgaloader.c b/armsrc/fpgaloader.c
index e3784bf5b4bade1a8b1d68e34868ada4c6c9660a..1e728e11884be4bbb438756266293be95325c757 100644 (file)
--- a/armsrc/fpgaloader.c
+++ b/armsrc/fpgaloader.c
@@ -119,7 +119,7 @@ void FpgaSetupSsc(void)
        AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(8) |     AT91C_SSC_MSBF | SSC_FRAME_MODE_WORDS_PER_TRANSFER(0);
 
        // clock comes from TK pin, no clock output, outputs change on falling
        AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(8) |     AT91C_SSC_MSBF | SSC_FRAME_MODE_WORDS_PER_TRANSFER(0);
 
        // clock comes from TK pin, no clock output, outputs change on falling

-       // edge of TK, start on rising edge of TF
+       // edge of TK, sample on rising edge of TK

        AT91C_BASE_SSC->SSC_TCMR = SSC_CLOCK_MODE_SELECT(2) |   SSC_CLOCK_MODE_START(5);
 
        // tx framing is the same as the rx framing
        AT91C_BASE_SSC->SSC_TCMR = SSC_CLOCK_MODE_SELECT(2) |   SSC_CLOCK_MODE_START(5);
 
        // tx framing is the same as the rx framing


@@ -140,12 +140,12 @@ bool FpgaSetupSscDma(uint8_t *buf, int len)
         return false;
     }
 
         return false;
     }
 

-       AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
-       AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) buf;
-       AT91C_BASE_PDC_SSC->PDC_RCR = len;
-       AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) buf;
-       AT91C_BASE_PDC_SSC->PDC_RNCR = len;
-       AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTEN;
+       AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;        // Disable DMA Transfer
+       AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) buf;           // transfer to this memory address
+       AT91C_BASE_PDC_SSC->PDC_RCR = len;                                      // transfer this many bytes
+       AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) buf;          // next transfer to same memory address
+       AT91C_BASE_PDC_SSC->PDC_RNCR = len;                                     // ... with same number of bytes
+       AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTEN;         // go!

     
     return true;
 }
     
     return true;
 }