From: Tobias Girstmair <tobi@isticktoit.net>
Date: Thu, 4 Mar 2021 12:41:18 +0000 (+0100)
Subject: new version
X-Git-Url: https://git.gir.st/Chiptunes-pms150c.git/commitdiff_plain/7cbbb5ba36f91d988768b2e49799663e3aef4bef

new version

div10 was prototyped with this program:

typedef unsigned char u8;
int main(void) {
	for (int i = 0; i <= 0x78; i++) {
		u8 real = i/10;
		u8 test = i;
		i++;

		test >>= 1;
		test += i;

		test >>= 1;
		test += 0;

		test >>= 1;
		test += 0;

		test >>= 1;
		test += i;

		test >>= 1;
		test += i;

		test >>= 1;
		test += 0;

		test >>= 1;
		test += 0;

		test >>= 1;
		test += 0;

		test >>= 1;
		i--;
		if (test != real)
			printf ("%hhd/10 == %hhd != %hhd\n", i, real, test);
	}
	return 0;
}
---

diff --git a/bsv.c b/bsv.c
index 8ce4b42..8bbde09 100644
--- a/bsv.c
+++ b/bsv.c
@@ -95,9 +95,37 @@ void main(void){
 		CALL	(g)
 		SR	(acc)
 		MOV	(tmp_1, acc) // acc saved in tmp_1; fresh acc
+		MOV	(acc, i2)
 		// shift-divide by ten
 		// note: i2 is max 0x78; so acc will <= 12.
-		acc = i2/10;//TODO
+                i2++;
+                acc >>= 1;
+                acc += i2;
+
+                acc >>= 1;
+                acc += 0;
+
+                acc >>= 1;
+                acc += 0;
+
+                acc >>= 1;
+                acc += i2;
+
+                acc >>= 1;
+                acc += i2;
+
+                acc >>= 1;
+                acc += 0;
+
+                acc >>= 1;
+                acc += 0;
+
+                acc >>= 1;
+                acc += 0;
+
+                acc >>= 1;
+                i2--;
+
 		// end divide by ten
 		AND	(acc, tmp_1) // acc restored from tmp_1
 		AND	(acc, 3)