Added dependency generation in Makefiles.

config/sdk-config.mk

@@ -57,14 +57,6 @@ endif
 
 LIBS := build/libc.a
 
-%.o: %.c
-	@echo "Compiling $@..."
-	@$(CC) -c $(CFLAGS) -o $@ $<
-
-%.o: %.s
-	@echo "Assembling $@)..."
-	@$(AS) $(ASFLAGS) -o $@ $<
-
 KERNEL_SRC_C := $(wildcard src/*.c) \
 	    	    $(wildcard src/*/*.c) \
 	    	    $(wildcard src/*/*/*.c) \
@@ -77,3 +69,4 @@ KERNEL_SRC_S := $(wildcard src/*.s) \
 	    	    $(wildcard src/*/*/*/*/*.s)
 KERNEL_OBJ := $(KERNEL_SRC_C:.c=.o) \
 			  $(KERNEL_SRC_S:.s=.o)
+KERNEL_DEP := $(KERNEL_SRC_C:.c=.d)

config/sdk-targets.mk

@@ -12,9 +12,25 @@ clean:
 	\) -delete
 	@find src -type f \( \
 		-name '*.o' -o \
+		-name '*.d' -o \
 		-name '$(TARGET)' \
 	\) -delete
 
+%.o: %.c
+	@echo "Compiling $@..."
+	@$(CC) -c $(CFLAGS) -o $@ $<
+
+%.o: %.s
+	@echo "Assembling $@)..."
+	@$(AS) $(ASFLAGS) -o $@ $<
+
+%.d: %.c
+	@echo "Generating dependencies for $<"
+	@printf '%s' "$(dir $@)" > $@
+	@$(CC) $(CFLAGS) --dependencies $< >> $@
+
 build/kernel.bin: $(KERNEL_OBJ)
 	@echo "Linking $@..."
 	@$(LD) -o $@ $(LDFLAGS) $^
+
+-include $(KERNEL_DEP)

include/drivers/vera.h

@@ -0,0 +1,21 @@
+//*****************************************************************************
+//  Sentinel 65X Kernel
+//
+//  include/drivers/vera.h
+//*****************************************************************************
+
+#pragma once
+
+#include <stdint.h>
+
+far void vera_init(void);
+
+far uint8_t vera_peek(uint32_t addr);
+
+far void vera_poke(uint32_t addr, uint8_t value);
+
+far void vera_poke16(uint32_t addr, uint16_t value);
+
+far void _vera_set_bgcolor(uint8_t color);
+#define vera_set_bgcolor(X) _vera_set_bgcolor((X))
+#define vera_set_bgcolour(X) _vera_set_bgcolor((X))

src/drivers/vera.c

@@ -0,0 +1,85 @@
+//*****************************************************************************
+//  Sentinel 65X Kernel
+//
+//  src/drivers/vera.c
+//*****************************************************************************
+
+#include <stdint.h>
+
+#include "config.h"
+#include "drivers/vera.h"
+
+typedef struct vera_s *VERA;
+
+struct vera_s {
+	uint8_t addr_x_l;
+	uint8_t addr_x_m;
+	uint8_t addr_x_h;
+	union {
+		uint8_t data[2];
+		uint16_t data16;
+	};
+	uint8_t ctrl;
+	uint8_t ien;
+	uint8_t isr;
+	union {
+		uint8_t irq_line_l;
+		uint8_t const scanline_l;
+	};
+};
+
+VERA vera = (VERA)(0x00df00);
+
+far void
+vera_init(void)
+{
+
+}
+
+far uint8_t
+vera_peek(uint32_t addr)
+{
+	(void) addr;
+
+	// Set addrsel to 0
+	uint8_t asel = vera->ctrl;
+	vera->ctrl = asel & 0b11111110;
+
+	// Set address
+	vera->addr_x_l = addr & 0x000000FF;
+	vera->addr_x_m = (addr & 0x0000FF00) >> 8;
+
+	vera->addr_x_h = vera->addr_x_h & 0b11111110;
+
+	vera->addr_x_h = vera->addr_x_h | (addr & ((uint32_t)(1) << 16));
+
+	return vera->data[0];
+}
+
+far void
+vera_poke(uint32_t addr, uint8_t value)
+{
+	(void) addr;
+
+	// Set addrsel to 0
+	uint8_t asel = vera->ctrl;
+	vera->ctrl = asel & 0b11111110;
+
+	// Set address
+	vera->addr_x_l = addr & 0x000000FF;
+	vera->addr_x_m = (addr & 0x0000FF00) >> 8;
+
+	vera->addr_x_h = vera->addr_x_h & 0b11111110;
+
+	vera->addr_x_h = vera->addr_x_h | (addr & ((uint32_t)(1) << 16));
+
+	vera->data[0] = value;
+	return;
+}
+
+far void
+_vera_set_bgcolor(uint8_t color)
+{
+	(void) color;
+	return;
+}

src/main.c

@@ -6,8 +6,12 @@
 
 #include "config.h"
 
+#include "drivers/vera.h"
+
 void
 main(void)
 {
+	vera_init();
+
 	for (;;) {}
 }