testpico: more timing tests

[megadrive.git] / testpico / hcnt2linear.c

diff --git a/testpico/hcnt2linear.c b/testpico/hcnt2linear.c
new file mode 100644 (file)
index 0000000..5f4c708
--- /dev/null
+++ b/testpico/hcnt2linear.c
@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <assert.h>
+
+//|         Mode |H32     (RSx=00) |H40     (RSx=11) |
+//|HCounter      |[1]0x000-0x127   |[1]0x000-0x16C   | 00-93 00-b6
+//|progression   |[2]0x1D2-0x1FF   |[2]0x1C9-0x1FF   | e9-ff e4-ff
+
+int main()
+{
+       unsigned char result[256];
+       int i, j, val, vals[420];
+
+       for (i = val = 0; val < 0x200; i++)
+       {
+               vals[i] = val++;
+               if (val == 0x16d)
+                       val = 0x1C9;
+       }
+       assert(i == 420);
+       for (i = 0; i < 256; i++)
+       {
+               result[i] = 0;
+               for (j = 0; j < 420; j++)
+                       if (vals[j] / 2 == i)
+                               break;
+               if (j < 420)
+                       result[i] = (255 * j + 210) / 419;
+       }
+
+       printf("{");
+       for (i = 0; i < 256; i++)
+               printf(" 0x%02x%s", result[i], i < 255 ? "," : "");
+       printf(" }\n");
+
+       printf("{");
+       for (i = 0; i < 64; i++)
+               printf(" 0x%02x%s", result[i*4+2], i < 63 ? "," : "");
+       printf(" }\n");
+
+       printf("{");
+       for (i = 0; i < 16; i++)
+               printf(" 0x%02x%s", result[i*16+8], i < 15 ? "," : "");
+       printf(" }\n");
+
+       return 0;
+}