Log checksum of transmitted data

src/ZuluSCSI_disk.cpp

@@ -1000,6 +1000,7 @@ static void doRead(uint32_t lba, uint32_t blocks)
             uint32_t count = sectors_in_prefetch - start_offset;
             if (count > transfer.blocks) count = transfer.blocks;
             scsiStartWrite(g_scsi_prefetch.buffer + start_offset * bytesPerSector, count * bytesPerSector);
+            azdbg("------ Found ", (int)count, " sectors in prefetch cache");
             transfer.currentBlock += count;
         }
 

src/ZuluSCSI_log_trace.cpp

@@ -12,6 +12,7 @@ extern "C" {
 static bool g_LogData = false;
 static int g_InByteCount = 0;
 static int g_OutByteCount = 0;
+static uint16_t g_DataChecksum = 0;
 
 static const char *getCommandName(uint8_t cmd)
 {
@@ -150,10 +151,10 @@ void scsiLogPhaseChange(int new_phase)
     {
         if (old_phase == DATA_IN || old_phase == DATA_OUT)
         {
-            azdbg("---- Total IN: ", g_InByteCount, " OUT: ", g_OutByteCount);
+            azdbg("---- Total IN: ", g_InByteCount, " OUT: ", g_OutByteCount, " CHECKSUM: ", (int)g_DataChecksum);
         }
         g_InByteCount = g_OutByteCount = 0;
-
+        g_DataChecksum = 0;
 
         if (old_phase >= 0 &&
             old_scsi_id == scsiDev.target->targetId &&
@@ -182,6 +183,16 @@ void scsiLogDataIn(const uint8_t *buf, uint32_t length)
         azdbg("------ IN: ", bytearray(buf, length));
     }
 
+    if (g_azlog_debug)
+    {
+        // BSD checksum algorithm
+        for (uint32_t i = 0; i < length; i++)
+        {
+            g_DataChecksum = (g_DataChecksum >> 1) + ((g_DataChecksum & 1) << 15);
+            g_DataChecksum += buf[i];
+        }
+    }
+
     g_InByteCount += length;
 }
 
@@ -197,5 +208,15 @@ void scsiLogDataOut(const uint8_t *buf, uint32_t length)
         azdbg("------ OUT: ", bytearray(buf, length));
     }
 
+    if (g_azlog_debug)
+    {
+        // BSD checksum algorithm
+        for (uint32_t i = 0; i < length; i++)
+        {
+            g_DataChecksum = (g_DataChecksum >> 1) + ((g_DataChecksum & 1) << 15);
+            g_DataChecksum += buf[i];
+        }
+    }
+
     g_OutByteCount += length;
 }