move samples that only work for a specific target into subdirs named the same as the target

2021-10-23 01:18:17 +02:00
parent c3d7a90084
commit 4f87c7cc64
10 changed files with 343 additions and 51 deletions
--- a/samples/atari2600/Makefile
+++ b/samples/atari2600/Makefile
@@ -0,0 +1,59 @@
+
+# Run 'make SYS=<target>'; or, set a SYS env.
+# var. to build for another target system.
+SYS ?= atari2600
+
+# Just the usual way to find out if we're
+# using cmd.exe to execute make rules.
+ifneq ($(shell echo),)
+  CMD_EXE = 1
+endif
+
+ifdef CMD_EXE
+  NULLDEV = nul:
+  DEL = -del /f
+  RMDIR = rmdir /s /q
+else
+  NULLDEV = /dev/null
+  DEL = $(RM)
+  RMDIR = $(RM) -r
+endif
+
+ifdef CC65_HOME
+  AS = $(CC65_HOME)/bin/ca65
+  CC = $(CC65_HOME)/bin/cc65
+  CL = $(CC65_HOME)/bin/cl65
+  LD = $(CC65_HOME)/bin/ld65
+  SP = $(CC65_HOME)/bin/sp65
+else
+  AS := $(if $(wildcard ../../bin/ca65*),../../bin/ca65,ca65)
+  CC := $(if $(wildcard ../../bin/cc65*),../../bin/cc65,cc65)
+  CL := $(if $(wildcard ../../bin/cl65*),../../bin/cl65,cl65)
+  LD := $(if $(wildcard ../../bin/ld65*),../../bin/ld65,ld65)
+  SP := $(if $(wildcard ../../bin/sp65*),../../bin/sp65,sp65)
+endif 
+
+EXELIST_atari2600 = \
+        hello
+
+ifneq ($(EXELIST_$(SYS)),)
+samples: $(EXELIST_$(SYS))
+else
+samples: notavailable
+endif
+
+# empty target used to skip systems that will not work with any program in this dir
+notavailable:
+ifeq ($(MAKELEVEL),0)
+	@echo "info: atari 2600 samples not available for" $(SYS)
+else
+# suppress the "nothing to be done for 'samples' message
+	@echo > $(NULLDEV)
+endif
+
+hello: hello.c
+	$(CL) -t $(SYS) -O -o hello -m hello.map hello.c
+	
+clean:
+	@$(DEL) $(EXELIST_atari2600) 2>$(NULLDEV)
+	@$(DEL) *.map 2>$(NULLDEV)
--- a/samples/atari2600/hello.c
+++ b/samples/atari2600/hello.c
@@ -0,0 +1,56 @@
+/*****************************************************************************/
+/*                                                                           */
+/* Atari VCS 2600 sample C program                                           */
+/*                                                                           */
+/* Florent Flament (contact@florentflament.com), 2017                        */
+/*                                                                           */
+/*****************************************************************************/
+
+#include <atari2600.h>
+
+// PAL Timings
+// Roughly computed based on Stella Programmer's guide (Steve Wright)
+// scanlines count per section.
+#define VBLANK_TIM64 51 // 45 lines * 76 cycles/line / 64 cycles/tick
+#define KERNAL_T1024 17 // 228 lines * 76 cycles/line / 1024 cycles/tick
+#define OVERSCAN_TIM64 42 // 36 lines * 76 cycles/line / 64 cycles/tick
+
+// Testing memory zones
+const unsigned char rodata_v[] = "Hello!";
+unsigned char data_v = 0x77;
+unsigned char bss_v;
+
+void main(void) {
+    unsigned char color = 0x79; // Stack variable
+    bss_v = 0x88; // Testing BSS variable
+
+    for/*ever*/(;;) {
+        // Vertical Sync signal
+        TIA.vsync = 0x02;
+        TIA.wsync = 0x00;
+        TIA.wsync = 0x00;
+        TIA.wsync = 0x00;
+        TIA.vsync = 0x00;
+
+        // Vertical Blank timer setting
+        RIOT.tim64t = VBLANK_TIM64;
+
+        // Doing frame computation during blank
+        TIA.colubk = color++; // Update color
+
+        // Wait for end of Vertical Blank
+        while (RIOT.timint == 0) {}
+        TIA.wsync = 0x00;
+        TIA.vblank = 0x00; // Turn on beam
+
+        // Display frame
+        RIOT.t1024t = KERNAL_T1024;
+        while (RIOT.timint == 0) {}
+        TIA.wsync = 0x00;
+        TIA.vblank = 0x02; // Turn off beam
+
+        // Overscan
+        RIOT.tim64t = OVERSCAN_TIM64;
+        while (RIOT.timint == 0) {}
+    }
+}