From 540f65e3e77ca9a741392389d309d84cf64bebcf Mon Sep 17 00:00:00 2001
From: surtur <a_mirre@utb.cz>
Date: Sat, 31 Oct 2020 19:47:47 +0100
Subject: [PATCH] chore: add arbitrary stuff

---
 bit-ops.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/bit-ops.c b/bit-ops.c
index bd44fe5..03e7b97 100644
--- a/bit-ops.c
+++ b/bit-ops.c
@@ -1,6 +1,7 @@
 #include <stdio.h>
 
 void zeroth_bit_test();
+void do_arbitrary_stuff();
 
 unsigned char PTAD;
 
@@ -26,6 +27,7 @@ void do_bit_ops() {
 	printf("PTAD ^= 0xfe --> %#010x (%#x)\n", PTAD, PTAD);
 
 	zeroth_bit_test();
+	do_arbitrary_stuff();
 }
 
 void zeroth_bit_test() {
@@ -45,6 +47,37 @@ void zeroth_bit_test() {
 	}
 }
 
+void gimme_bin_int(char byte) {
+	for (int i = 0; i < 8; i++) {
+		printf("%d", !!((byte << i) & 0x80));
+	}
+	printf(")\n");
+}
+
+void do_arbitrary_stuff() {
+	unsigned char PTCD;
+	/* set 1st bit to 1 */
+	printf("----------\n* set 1st bit to 1\n");
+	printf("PTCD = %#x\n", PTCD=0x00);
+	PTCD |= 0x01;
+	printf("PTCD |= 0x01 --> %#010x (", PTCD);
+	gimme_bin_int(PTCD);
+
+	printf("----------\n* set 2nd bit to 1\n");
+	printf("PTCD = %u (", PTCD=0b101);
+	gimme_bin_int(PTCD);
+	PTCD |= 0b111;
+	printf("PTCD |= 7 --> %#010x (", PTCD);
+	gimme_bin_int(PTCD);
+
+	printf("----------\n* set {6,7}th bit to 1\n");
+	printf("PTCD = %u (", PTCD=0x3a);
+	gimme_bin_int(PTCD);
+	PTCD |= 0xc0;
+	printf("PTCD |= 1110 0000 --> %#010x (", PTCD);
+	gimme_bin_int(PTCD);
+}
+
 
 int main() {
 	printf("*** bit-ops pls ***\n");