fixing hf snoop:

- add: clear the trace buffer before snooping
- fix: allow trigger on odd samples as well
- fix: don't use Dbprintf() in timing tight loops

diff --git a/armsrc/hfsnoop.c b/armsrc/hfsnoop.c
index b7d69013708edfb0b9cc20170646e47aa60a769f..56774bd09d635eb258de88d254c54ec1f0823c83 100644 (file)
--- a/armsrc/hfsnoop.c
+++ b/armsrc/hfsnoop.c
@@ -7,7 +7,6 @@ static void RAMFUNC optimizedSnoop(void);
 
 static void RAMFUNC optimizedSnoop(void)
 {
-       BigBuf_free();
        int n = BigBuf_max_traceLen() / sizeof(uint16_t); // take all memory
 
        uint16_t *dest = (uint16_t *)BigBuf_get_addr();
@@ -29,7 +28,7 @@ static void RAMFUNC optimizedSnoop(void)
 
 void HfSnoop(int samplesToSkip, int triggersToSkip)
 {
-       Dbprintf("Skipping first %d sample pairs, Skipping %d triggers.\n", samplesToSkip, triggersToSkip);
+       Dbprintf("Skipping first %d sample pairs, Skipping %d triggers.", samplesToSkip, triggersToSkip);
        bool trigger_cnt;
        LED_D_ON();
        // Select correct configs
@@ -41,6 +40,9 @@ void HfSnoop(int samplesToSkip, int triggersToSkip)
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SNOOP);
        SpinDelay(100);
 
+       BigBuf_free();
+       BigBuf_Clear();
+       
        AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(16); // Setting Frame Mode For better performance on high speed data transfer.
 
        trigger_cnt = 0;
@@ -49,24 +51,25 @@ void HfSnoop(int samplesToSkip, int triggersToSkip)
                WDT_HIT();
                if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
                        r = (uint16_t)AT91C_BASE_SSC->SSC_RHR;
-                       if (!(trigger_cnt == triggersToSkip) && ( (r >> 8) >= 240)) 
+                       r = MAX(r & 0xff, r >> 8); 
+                       if (r >= 240) 
                        {
-                               Dbprintf("Trigger kicked! Value: %d.", r >> 8);
-                               trigger_cnt++;
-                               break;
+                               if (++trigger_cnt > triggersToSkip) {
+                                       break;
+                               }
                        } 
                }
        }
+
        if(!BUTTON_PRESS()) {
-               Dbprintf("Trigger kicked! Value: %d, Dumping Samples Hispeed now.", r >> 8);
                int waitcount = samplesToSkip; // lets wait 40000 ticks of pck0
                while(waitcount != 0) {
                        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
                                waitcount--;
                        }
                }
-
                optimizedSnoop();
+               Dbprintf("Trigger kicked! Value: %d, Dumping Samples Hispeed now.", r);
        }
 
        DbpString("HF Snoop end");