Small flash saving in General Menus (60bytes)

Backlight brightness now supported on ARM
SD card archive function continued
Simu backlight support for v4

src/gruvin9x/logs.cpp

@@ -49,11 +49,11 @@ void initLogs()
   if (g_oLogFile.fs) f_close(&g_oLogFile);
   g_logState = 0;
 
-  strcpy_P(g_logFilename, PSTR(LOG_PATH "M00_000.CSV"));
+  strcpy_P(g_logFilename, PSTR(LOG_PATH "/M00_000.CSV"));
 
   // Set log file model number
   uint8_t num = g_eeGeneral.currModel + 1;
-  char *n = &g_logFilename[11]; // TODO constant
+  char *n = &g_logFilename[sizeof(LOG_PATH) + 3];
   *n = (char)((num % 10) + '0');
   *(--n) = (char)((num / 10) + '0');
 
@@ -74,7 +74,7 @@ void initLogs()
       f_close(&g_oLogFile);
 
       // bump log file counter (file extension)
-      n = &g_logFilename[15];
+      n = &g_logFilename[sizeof(LOG_PATH) + 7];
       if (++*n > '9')
       {
         *n='0';