git.y1.nz

commit 9bc0c38eecc2acb892508628da75dbc45332abe8
parent 99c2e580b7223fc5115c73a7d27e2e42367dca53
Author: Toxa <untoxa@mail.ru>
Date:   Sun, 20 Jul 2025 00:58:20 +0300

EXAMPLES: SMS: the NMI handler example

Diffstat:
A
gbdk-lib/examples/sms/pause_button/Makefile
68
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A
gbdk-lib/examples/sms/pause_button/Readme.md
2
++
A
gbdk-lib/examples/sms/pause_button/src/pause.c
22
++++++++++++++++++++++

3 files changed, 92 insertions(+), 0 deletions(-)
diff --git a/gbdk-lib/examples/sms/pause_button/Makefile b/gbdk-lib/examples/sms/pause_button/Makefile
@@ -0,0 +1,68 @@
+#
+# A Makefile that compiles all .c and .s files in "src" and "res" 
+# subdirectories and places the output in a "obj" subdirectory
+#
+
+# If you move this project you can change the directory 
+# to match your GBDK root directory (ex: GBDK_HOME = "C:/GBDK/"
+ifndef GBDK_HOME
+	GBDK_HOME = ../../../
+endif
+
+LCC = $(GBDK_HOME)bin/lcc 
+
+
+# GBDK_DEBUG = ON
+ifdef GBDK_DEBUG
+	LCCFLAGS += -debug -v
+endif
+
+# You can set flags for LCC here
+# For example, you can uncomment the line below to turn on debug output
+LCCFLAGS += -mz80:sms -autobank
+
+# You can set the name of the .gb ROM file here
+PROJECTNAME = pause
+
+SRCDIR      = src
+OBJDIR      = obj
+RESDIR      = res
+BINS	    = $(OBJDIR)/$(PROJECTNAME).sms
+CSOURCES    = $(foreach dir,$(SRCDIR),$(notdir $(wildcard $(dir)/*.c))) $(foreach dir,$(RESDIR),$(notdir $(wildcard $(dir)/*.c)))
+ASMSOURCES  = $(foreach dir,$(SRCDIR),$(notdir $(wildcard $(dir)/*.s)))
+OBJS        = $(CSOURCES:%.c=$(OBJDIR)/%.o) $(ASMSOURCES:%.s=$(OBJDIR)/%.o)
+
+all:	prepare $(BINS)
+
+compile.bat: Makefile
+	@echo "REM Automatically generated from Makefile" > compile.bat
+	@make -sn | sed y/\\//\\\\/ | sed s/mkdir\ -p\/mkdir\/ | grep -v make >> compile.bat
+
+# Compile .c files in "src/" to .o object files
+$(OBJDIR)/%.o:	$(SRCDIR)/%.c
+	$(LCC) $(LCCFLAGS) -c -o $@ $<
+
+# Compile .c files in "res/" to .o object files
+$(OBJDIR)/%.o:	$(RESDIR)/%.c
+	$(LCC) $(LCCFLAGS) -c -o $@ $<
+
+# Compile .s assembly files in "src/" to .o object files
+$(OBJDIR)/%.o:	$(SRCDIR)/%.s
+	$(LCC) $(LCCFLAGS) -c -o $@ $<
+
+# If needed, compile .c files in "src/" to .s assembly files
+# (not required if .c is compiled directly to .o)
+$(OBJDIR)/%.s:	$(SRCDIR)/%.c
+	$(LCC) $(LCCFLAGS) -S -o $@ $<
+
+# Link the compiled object files into a .gb ROM file
+$(BINS):	$(OBJS)
+	$(LCC) $(LCCFLAGS) -o $(BINS) $(OBJS)
+
+prepare:
+	mkdir -p $(OBJDIR) $(RESDIR)
+
+clean:
+#	rm -f  *.gb *.ihx *.cdb *.adb *.noi *.map
+	rm -f  $(OBJDIR)/*.*
+
diff --git a/gbdk-lib/examples/sms/pause_button/Readme.md b/gbdk-lib/examples/sms/pause_button/Readme.md
@@ -0,0 +1,2 @@
+
+Demonstration of how to create the NMI handler
diff --git a/gbdk-lib/examples/sms/pause_button/src/pause.c b/gbdk-lib/examples/sms/pause_button/src/pause.c
@@ -0,0 +1,22 @@
+#include <gbdk/platform.h>
+#include <stdio.h>
+#include <stdbool.h>
+
+volatile bool PauseRequested = false; 
+
+void NMI_ISR (void) CRITICAL INTERRUPT {   // the function name MUST be "NMI_ISR"
+    PauseRequested = true;
+}
+
+void main(void) {
+    puts("Press PAUSE button");
+    while(1) {
+        if (PauseRequested) {
+            puts("PAUSED! press A to unpause");
+            waitpad(J_A);
+            puts("UNPAUSED");            
+            PauseRequested = false;
+        }
+        wait_vbl_done();
+    } 
+}

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