Initial Commit

z_gbdk_playground_original/link/Makefile

@@ -0,0 +1,17 @@
+AS = lcc -c
+CC = lcc -Wa-l -Wl-m
+
+BIN = link.gb
+OBJS = link.o
+
+all: $(BIN)
+
+%.s: %.ms
+	maccer -o $@ $<
+
+$(BIN): $(OBJS)
+	$(CC) -o $(BIN) $(OBJS)
+
+clean:
+	rm -rf $(BIN) $(OBJS) *~
+

z_gbdk_playground_original/link/README.md

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+# Link
+
+![](screenshot.png)
+
+Demonstrates how to use the Link Cable to send and receive bytes.
+

z_gbdk_playground_original/link/link.c

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+#include <stdio.h>
+#include <gb/gb.h>
+
+void main(void) {
+	printf("A: Send\nB: Receive\n\n");
+	_io_out = 1;
+	while (1) {
+		if (joypad() == J_A) {
+			waitpadup();
+			send_byte(); // send _io_out
+			printf("Sending...\n");
+			while (_io_status == IO_SENDING); // Wait for Send
+			if (_io_status == IO_IDLE) // If IO status returns to Idle then success
+				printf("Sent %d\n", (int)_io_out);
+			else
+				printf("Error\n"); // Else print error code
+			_io_out++;
+		}
+		if (joypad() == J_B) {
+			waitpadup();
+			receive_byte(); // receive _io_in
+			printf("Receiving...\n");
+			while (_io_status == IO_RECEIVING); // Wait for Receive
+			if (_io_status == IO_IDLE) // If IO status returns to Idle then success
+				printf("Received %d\n", (int)_io_in);
+			else
+				printf("Error\n"); // Else print error
+		}
+	}
+}