Index: apps/iap.c
===================================================================
--- apps/iap.c	(revision 22234)
+++ apps/iap.c	(working copy)
@@ -29,6 +29,7 @@
 #include "system.h"
 #include "kernel.h"
 #include "serial.h"
+#include "ata_idle_notify.h"
 #include "appevents.h"
 
 #include "playlist.h"
@@ -54,10 +55,72 @@
 
 unsigned char serbuf[RX_BUFLEN];
 static int serbuf_i = 0;
+static int serbuf_size = 0;
 
 static unsigned char response[TX_BUFLEN];
 static int responselen;
 
+#define MAX_LOGBUF 2048
+static char logbuf[MAX_LOGBUF];
+static int  logbuf_end = 0;
+#define SERIAL_LOGFILE "/seriallog.txt"
+
+bool serial_log_flush(void)
+{
+    int fd;
+    
+    fd = open (SERIAL_LOGFILE,O_APPEND|O_CREAT|O_RDWR);
+    if (fd>=0)
+    {
+        if (logbuf_end+1<MAX_LOGBUF-1)
+            logbuf[logbuf_end++] = '\0';
+        write(fd, logbuf, logbuf_end);
+        logbuf_end = 0;
+        close(fd);
+    }
+    return fd >= 0;
+}    
+static char* chartohex(char val)
+{
+    static char ret[2];
+    const char hexdigit[] = "0123456789ABCDEF";
+    ret[0] = hexdigit[(val&0xf0)>>4];
+    ret[1] = hexdigit[val&0xf];
+    return ret;
+}    
+void serial_log_packet (const int in_packet, const char* data, const int size)
+{
+    int i;
+    int startindex;
+    char incoming[] = "IN  ";
+    char outgoing[] = "OUT ";
+    const int message_additions = sizeof(incoming)+1; /* +1 is for the "\n" */
+    if (logbuf_end + size + message_additions > MAX_LOGBUF-1)
+        serial_log_flush();
+    if (in_packet)
+    {
+        memcpy(&logbuf[logbuf_end], incoming, sizeof(incoming));
+        logbuf_end += sizeof(incoming);
+        startindex = 0;
+    }
+    else
+    {
+        memcpy(&logbuf[logbuf_end], outgoing, sizeof(outgoing));
+        logbuf_end += sizeof(outgoing);
+        /* we don't need to print the heading marker FF 55 */
+        startindex = 2;
+    }
+
+    /* size-1 : don't print checksum */
+    for (i=startindex;i<size-1;i++)
+    {
+        char *hex = chartohex(data[i]);
+        logbuf[logbuf_end++] = hex[0];
+        logbuf[logbuf_end++] = hex[1];
+    }
+    logbuf[logbuf_end++] = '\n';
+}
+
 static void iap_task(void)
 {
     static int count = 0;
@@ -81,6 +144,7 @@
     iap_remotebtn = BUTTON_NONE;
     tick_add_task(iap_task);
     add_event(PLAYBACK_EVENT_TRACK_CHANGE, false, iap_track_changed);
+    add_event(DISK_EVENT_SPINUP, false, serial_log_flush);
 }
 
 void iap_bitrate_set(int ratenum)
@@ -134,6 +198,8 @@
 
     response[i+3] = 0x100 - (chksum & 0xFF);
     
+    serial_log_packet (0,response,responselen);
+
     for(i = 0; i < responselen; i ++)
     {
         while (!tx_rdy()) ;
@@ -154,13 +220,18 @@
         serbuf_i = 0;
         chksum = 0;
         newpkt = false;
+        serbuf_size = 0;
     }
     else
     {
         if(serbuf_i >= RX_BUFLEN)
+        {
             serbuf_i = 0;
+            serbuf_size = 0;
+        }
 
         serbuf[serbuf_i++] = x;
+        serbuf_size++;
         chksum += x;
     }
     last_x = x;
@@ -224,6 +295,7 @@
         queue_post(&button_queue, SYS_IAP_HANDLEPKT, 0);
         return;
     }
+    serial_log_packet (1,serbuf,serbuf_size);
     
     /* Handle Mode 0 */
     if (serbuf[1] == 0x00)