Fix issue #103 (hopefully). Quite an old bug which was previously

masked by a big DMA_BUFFER_SIZE.

diff --git a/armsrc/iso14443.c b/armsrc/iso14443.c
index c7f49f14059293dc46e5a8c845175b5c03d8e6a9..c202e312d26c993a8801eaca2bbca80493d96965 100644 (file)
--- a/armsrc/iso14443.c
+++ b/armsrc/iso14443.c
@@ -24,6 +24,9 @@
 #define TAG_READER_BUFFER_SIZE 2048
 #define DEMOD_DMA_BUFFER_SIZE 1024
 */
+
+#define RECEIVE_SAMPLES_TIMEOUT 2000
+
 //=============================================================================
 // An ISO 14443 Type B tag. We listen for commands from the reader, using
 // a UART kind of thing that's implemented in software. When we get a
@@ -658,9 +661,6 @@ static void GetSamplesFor14443Demod(int weTx, int n, int quiet)
        // free all previous allocations first
        BigBuf_free();
        
-       // The command (reader -> tag) that we're receiving.
-       uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE);
-       
        // The response (tag -> reader) that we're receiving.
        uint8_t *receivedResponse = BigBuf_malloc(MAX_FRAME_SIZE);
        
@@ -669,8 +669,6 @@ static void GetSamplesFor14443Demod(int weTx, int n, int quiet)
 
        // Set up the demodulator for tag -> reader responses.
        DemodInit(receivedResponse);
-       // Set up the demodulator for the reader -> tag commands
-       UartInit(receivedCmd);
 
        // Setup and start DMA.
        FpgaSetupSscDma(dmaBuf, DMA_BUFFER_SIZE);
@@ -695,8 +693,8 @@ static void GetSamplesFor14443Demod(int weTx, int n, int quiet)
                        ci = upTo[0];
                        cq = upTo[1];
                        upTo += 2;
-                       if(upTo - dmaBuf > DMA_BUFFER_SIZE) {
-                               upTo -= DMA_BUFFER_SIZE;
+                       if(upTo >= dmaBuf + DMA_BUFFER_SIZE) {
+                               upTo = dmaBuf;
                                AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
                                AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
                        }
@@ -707,15 +705,12 @@ static void GetSamplesFor14443Demod(int weTx, int n, int quiet)
 
                        samples += 2;
 
-                       Handle14443UartBit(1);
-                       Handle14443UartBit(1);
-
                        if(Handle14443SamplesDemod(ci, cq)) {
                                gotFrame = 1;
                        }
                }
 
-               if(samples > 2000) {
+               if(samples > n) {
                        break;
                }
        }
@@ -724,8 +719,8 @@ static void GetSamplesFor14443Demod(int weTx, int n, int quiet)
        //Tracing
        if (tracing && Demod.len > 0) {
                uint8_t parity[MAX_PARITY_SIZE];
-               GetParity(Demod.output , Demod.len, parity);
-               LogTrace(Demod.output,Demod.len, 0, 0, parity, FALSE);
+               GetParity(Demod.output, Demod.len, parity);
+               LogTrace(Demod.output, Demod.len, 0, 0, parity, FALSE);
        }
 }
 
@@ -934,7 +929,7 @@ void ReadSTMemoryIso14443(uint32_t dwLast)
 
        CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1));
 //    LED_A_ON();
-       GetSamplesFor14443Demod(TRUE, 2000,TRUE);
+       GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE);
 //    LED_A_OFF();
 
        if (Demod.len == 0) {
@@ -952,7 +947,7 @@ void ReadSTMemoryIso14443(uint32_t dwLast)
        CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1));
 
 //    LED_A_ON();
-       GetSamplesFor14443Demod(TRUE, 2000,TRUE);
+       GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE);
 //    LED_A_OFF();
        if (Demod.len != 3) {
        Dbprintf("Expected 3 bytes from tag, got %d", Demod.len);
@@ -976,7 +971,7 @@ void ReadSTMemoryIso14443(uint32_t dwLast)
        CodeAndTransmit14443bAsReader(cmd1, 3); // Only first three bytes for this one
 
 //    LED_A_ON();
-       GetSamplesFor14443Demod(TRUE, 2000,TRUE);
+       GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE);
 //    LED_A_OFF();
        if (Demod.len != 10) {
        Dbprintf("Expected 10 bytes from tag, got %d", Demod.len);
@@ -1008,7 +1003,7 @@ void ReadSTMemoryIso14443(uint32_t dwLast)
                CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1));
 
 //         LED_A_ON();
-               GetSamplesFor14443Demod(TRUE, 2000,TRUE);
+               GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE);
 //         LED_A_OFF();
                if (Demod.len != 6) { // Check if we got an answer from the tag
                DbpString("Expected 6 bytes from tag, got less...");
@@ -1118,10 +1113,10 @@ void RAMFUNC SnoopIso14443(void)
                cq = upTo[1];
                upTo += 2;
                lastRxCounter -= 2;
-               if(upTo - dmaBuf > DMA_BUFFER_SIZE) {
-                       upTo -= DMA_BUFFER_SIZE;
+               if(upTo >= dmaBuf + DMA_BUFFER_SIZE) {
+                       upTo = dmaBuf;
                        lastRxCounter += DMA_BUFFER_SIZE;
-                       AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
+                       AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf;
                        AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
                }
 
@@ -1237,8 +1232,8 @@ void SendRawCommand14443B(uint32_t datalen, uint32_t recv,uint8_t powerfield, ui
 
        if(recv)
        {
+               GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE);
                uint16_t iLen = MIN(Demod.len,USB_CMD_DATA_SIZE);
-               GetSamplesFor14443Demod(TRUE, 2000, TRUE);
                cmd_send(CMD_ACK,iLen,0,0,Demod.output,iLen);
        }
        if(!powerfield)