git.y1.nz

commit 6c4009412867d546a4a4447fb1b75f8e7990884a
parent 3ae2a52757877352bf4608005313674a9003e270
Author: Toxa <56631470+untoxa@users.noreply.github.com>
Date:   Fri, 29 Sep 2023 09:56:12 +0300

Merge pull request #582 from michel-iwaniec/nes_snes_joypads_example

NES: Add example program for reading SNES joypads on NES
Diffstat:
A
gbdk-lib/examples/nes/snes_joypads/Makefile
30
++++++++++++++++++++++++++++++
A
gbdk-lib/examples/nes/snes_joypads/snes_joypads.c
83
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

2 files changed, 113 insertions(+), 0 deletions(-)
diff --git a/gbdk-lib/examples/nes/snes_joypads/Makefile b/gbdk-lib/examples/nes/snes_joypads/Makefile
@@ -0,0 +1,30 @@
+CC	= ../../../bin/lcc -mmos6502:nes -Wm-yoA -Wl-j
+
+BINS	= snes_joypads.nes
+
+all:	$(BINS)
+
+ASRC = $(wildcard *.s)
+CSRC = $(wildcard *.c) 
+
+OBJS = $(CSRC:%.c=%.o) $(ASRC:%.s=%.o)
+
+compile.bat: Makefile
+	@echo "REM Automatically generated from Makefile" > compile.bat
+	@make -sn | sed y/\\//\\\\/ | sed s/mkdir\ -p\/mkdir\/ | grep -v make >> compile.bat
+
+# Compile and link single file in one pass
+
+%.o:	%.c
+	$(CC) -c -o $@ $<
+
+%.o:	%.s
+	$(CC) -c -o $@ $<
+
+$(BINS):	$(OBJS)
+	$(CC) -Wm-yS -o $@ $^
+	rm -f *.map *.noi *.ihx *.lst
+
+clean:
+	rm -f *.o *.lst *.map *.nes *~ *.rel *.cdb *.ihx *.lnk *.sym *.asm *.noi
+
diff --git a/gbdk-lib/examples/nes/snes_joypads/snes_joypads.c b/gbdk-lib/examples/nes/snes_joypads/snes_joypads.c
@@ -0,0 +1,83 @@
+/*
+    snes_joypads.c
+
+    An example of reading SNES joypad input on NES.
+    
+    Displays the status of keys pressed on the screen,
+    in the following format: (or whitespace when not pressed)
+    
+    JOYn: lrud SELECT START YBXALR
+
+    SNES joypads use the same protocol as NES joypads, with
+    the number of valid bits on the serial interface being 
+    greater for a SNES joypad. Even though the physical
+    connectors differ, simple adapters can be built from
+    extension coords.
+    
+    Because the "Four Score" 4-player adapter for the NES reports
+    2 joypads in two separate bytes read serially, it can 
+    easily be repurposed for 2 SNES joypads, by reinterpreting
+    the two bytes for two different NES joypads as the input
+    for one SNES joypad.
+    
+    The extra buttons on a SNES joypad can be quite useful for 
+    adding debug functionality to your game while in development.
+    They can also be used in your final game - but consider making
+    this an optional feature, as not everyone will have a 
+    SNES-to-NES joypad adapter, or be keen on the idea of using
+    SNES joypads on a NES.
+*/
+
+#include <stdio.h>
+#include <gbdk/platform.h>
+#include <gbdk/font.h>
+#include <gbdk/console.h>
+
+#define JS_X J_B
+#define JS_Y J_B
+#define JS_B J_A 
+#define JS_A J_A
+#define JS_L J_SELECT 
+#define JS_R J_START
+
+joypads_t joypads;
+
+void main(void)
+{
+    font_t ibm_font;
+    int i;
+    // Init font system and load font
+    font_init();
+    ibm_font = font_load(font_ibm);
+    // 4 NES joypads = 2 SNES joypads
+    joypad_init(4, &joypads);
+    DISPLAY_ON;
+    while(TRUE)
+    {
+        // poll 4 NES joypads
+        joypad_ex(&joypads);
+        // Loop over 2 SNES joypads
+        for(i = 0; i < 2; i++)
+        {
+            int y = 4 + 2*i;
+            uint8_t joy = joypads.joypads[i];     // Common NES/SNES bits
+            uint8_t joy_s = joypads.joypads[i+2]; // SNES additional bits
+            gotoxy(1, y);
+            printf("JOY%d: ", i);
+            putchar((joy & J_LEFT)   ? 'l' : ' ');
+            putchar((joy & J_RIGHT)  ? 'r' : ' ');
+            putchar((joy & J_UP)     ? 'u' : ' ');
+            putchar((joy & J_DOWN)   ? 'd' : ' ');
+            printf( (joy & J_SELECT) ? "SELECT " : "       ");
+            printf( (joy & J_START)  ? "START "  : "      ");
+            putchar((joy & JS_Y)     ? 'Y' : ' ');
+            putchar((joy & JS_B)     ? 'B' : ' ');
+            putchar((joy_s & JS_X)   ? 'X' : ' ');
+            putchar((joy_s & JS_A)   ? 'A' : ' ');
+            putchar((joy_s & JS_L)   ? 'L' : ' ');
+            putchar((joy_s & JS_R)   ? 'R' : ' ');
+
+        }
+        vsync();
+    }
+}

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