From 6dba62943ca651a8ead6b8de02deb7b352dc8388 Mon Sep 17 00:00:00 2001
From: giomba <giomba@glgprograms.it>
Date: Sun, 17 Mar 2024 22:18:40 +0100
Subject: [PATCH] Add automatic calibration for timing.

---
 MATTEO.BAS | 59 +++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 54 insertions(+), 5 deletions(-)

diff --git a/MATTEO.BAS b/MATTEO.BAS
index ac97b56..f8e6309 100644
--- a/MATTEO.BAS
+++ b/MATTEO.BAS
@@ -1,9 +1,23 @@
+DECLARE SUB CALIBRATION ()
+DECLARE SUB BUSYDELAY (ms!)
 DECLARE SUB RAINBOW ()
 DECLARE SUB CENTER (text$)
 DECLARE SUB SETUP ()
 DECLARE SUB LOADBAR ()
 DECLARE SUB SONG ()
+
+KEY(3) ON
+ON KEY(3) GOSUB Terminate
+
 CLS
+REM Numero di cicli nel ritardo con attesa attiva
+DIM SHARED timecycles AS LONG
+timecycles = 100
+REM Costante temporale per ritardo di 1ms (calibrazione)
+DIM SHARED timeconst AS INTEGER
+
+CALL CALIBRATION
+CALL BUSYDELAY(1000)
 
 CALL SETUP
 CALL SONG
@@ -13,11 +27,46 @@ PRINT "da GiulioF e giomba"
 LOCATE 13, 60
 PRINT "   23 marzo 2024"
 
+LOCATE 4, 1
+PRINT SPACE$(80)
+LOCATE 4
+CENTER "Premere F3 per uscire"
+
 DO
     CALL RAINBOW
-    IF NOT INKEY$ = "" THEN EXIT DO
 LOOP
 
+Terminate:
+END
+
+SUB BUSYDELAY (ms)
+
+FOR i = 1 TO ms: FOR d = 1 TO timeconst: NEXT d: NEXT i
+
+END SUB
+
+SUB CALIBRATION
+
+REM Ritorna numero di cicli da eseguire per attesa di 1ms
+PRINT "Calibrazione velocit… processore in corso..."
+DIM delay AS LONG
+
+diff = 0
+
+WHILE diff < 1
+    PRINT ".";
+    timecycles = timecycles * 2
+    tstart = TIMER
+    FOR delay = 1 TO timecycles: NEXT delay
+    tend = TIMER
+    diff = tend - tstart
+WEND
+
+timeconst = .001 * timecycles / diff
+
+PRINT timeconst; " cicli"
+
+END SUB
 
 SUB CENTER (text$)
 
@@ -36,7 +85,7 @@ FOR col% = 1 TO 30
         COLOR 4
         PRINT CHR$(c);
     NEXT row%
-    FOR d = 1 TO 10000: NEXT d
+    CALL BUSYDELAY(100)
     FOR row% = 10 TO 14
         c = SCREEN(row%, col%)
         LOCATE row%, col%
@@ -70,16 +119,16 @@ NEXT i
 FOR i = 19 TO 59 STEP 1
     LOCATE 20, i + 1
     PRINT CHR$(&HDB)
-    FOR d = 0 TO 2000: NEXT d
+    CALL BUSYDELAY(100)
 NEXT i
 
-SLEEP 1
+CALL BUSYDELAY(1000)
 
 PRINT
 CENTER "come sono burlone"
 CENTER CHR$(1)
 
-SLEEP 2
+CALL BUSYDELAY(2000)
 
 END SUB