From 15c681c7e38f762fb416e98f01d3f3aca5b39911 Mon Sep 17 00:00:00 2001
From: Kai Lauterbach <klaute@web.de>
Date: Wed, 30 Nov 2011 19:21:11 +0100
Subject: [PATCH] A simple test program to simulate the bitshifting in the ISR.

---
 firmware/isr_test.c | 52 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 firmware/isr_test.c

diff --git a/firmware/isr_test.c b/firmware/isr_test.c
new file mode 100644
index 0000000..c77a6ab
--- /dev/null
+++ b/firmware/isr_test.c
@@ -0,0 +1,52 @@
+
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main (void)
+{
+    int PORTD = 0xff;
+    int PORTB = 0xff;
+    int cube = 0x000001ff;
+    int cube_level = 0;
+
+    char test[100];
+
+    int i = 0;
+    for (i = 0; i < 3; i++)
+    {
+
+    printf("-----------------\ncube_level = %d\n",cube_level);
+
+    printf("PORTD = 0x%2x\n", PORTD);
+    printf("PORTB = 0x%2x\n", PORTB);
+
+    PORTD &= 0x87; // 0x87 = 0b10000111; // 7tes Bit löschen (Leitung 9) und alle Ebenen deaktivieren
+
+    printf("& 0b10000111: PORTD = 0x%2x\n", PORTD);
+
+    PORTD |= ((1 << cube_level)<< 3); // cube_level setzen (Ebene A=0, B=1, C=2)
+
+    printf("Level festlegen: PORTD = 0x%2x\n", PORTD);
+
+    int tmp = cube_level * 9;
+
+    printf("8 Bits aus cube: PORTD = 0x%2x\n", ((~cube & (0xff << tmp)) >> tmp));
+    // PORTB = 1..8
+    // 0 = leuchtet, 1 = leuchtet nicht (invertiert!)
+    PORTB = ((~cube & (0xff << tmp)) >> tmp);
+
+    printf("Pins1-8: PORTB = 0x%2x\n", PORTB);
+
+    // PORTD &= 0b10111111; // bereits oben erledigt
+    PORTD |= (((~cube & (1 << (tmp+8))) >> (tmp+8)) << 6);
+
+    printf("Pin9: PORTD = 0x%2x\n", PORTD);
+
+    cube_level++;
+    if (cube_level > 2) cube_level = 0;
+
+    }
+
+}
+