Improved display list instruction definition for more comfortable use within void data definition.

testcode/lib/atari/displaylist.c

@@ -0,0 +1,69 @@
+/*
+** testprogram for ANTIC instructions as defined in "_antic.h"
+**
+** 23-Feb-2017, Christian Krueger
+*/
+
+#include <conio.h>
+#include <atari.h>
+#include <peekpoke.h>
+#include <string.h>
+
+// code is only for testing purposes, as screen and display list are not aligned
+// and jumps not set!
+
+unsigned char DummyScreen[400];
+
+void DisplayList = {
+	DL_BLK1,
+	DL_BLK2,
+	DL_BLK3,
+	DL_BLK4,
+	DL_BLK5,
+	DL_BLK6,
+	DL_BLK7,
+	DL_DLI(DL_BLK8),
+	DL_LMS(DL_CHR40x8x1),
+	DummyScreen,
+	DL_HSCROL(DL_CHR40x10x1),
+	DL_VSCROL(DL_CHR40x8x4),
+	DL_CHR40x16x4,
+	DL_LMS(DL_HSCROL(DL_VSCROL(DL_DLI(DL_CHR20x8x2)))),
+	DummyScreen+120,
+	DL_CHR20x16x2,
+	DL_MAP40x8x4,
+	DL_MAP80x4x2,
+	DL_MAP80x4x4,
+	DL_MAP160x2x2,
+	DL_MAP160x1x2,
+	DL_MAP160x2x4,
+	DL_MAP160x1x4,
+ 	DL_MAP320x1x1, 
+	DL_JVB,
+	DL_JMP
+};
+
+unsigned char dlend = 0;
+
+
+int
+main(void)
+{
+    // unfortunately "sizeof()" doesn't work with void data
+    // (Error: Size of data type is unknown)
+    // so we trick with the adresses at front and behind...
+
+    int returnValue = (((unsigned int)&dlend-(unsigned int)&DisplayList) != 28);  // assure only one byte per instruction!
+
+    clrscr();
+    if (returnValue)
+        cputs("Test FAILED!");
+    else
+        cputs("Test passed.");
+
+    cputs("\n\rHit any key to exit...");
+    cgetc();
+
+    return returnValue;
+}
+