Add Peanut-GB emulator

Signed-off-by: Mahyar Koshkouei <mk@deltabeard.com>

src/main.c

@@ -1,3 +1,6 @@
+#define ENABLE_LCD 0
+#define ENABLE_SOUND 0
+
 /* C Headers */
 #include <stdio.h>
 
@@ -6,12 +9,110 @@
 
 /* Project headers */
 #include "hedley.h"
+#include "peanut_gb.h"
+
+static unsigned char rom[32768] = { 0 };
+
+struct priv_t
+{
+    /* Pointer to allocated memory holding GB file. */
+    uint8_t *rom;
+    /* Pointer to allocated memory holding save file. */
+    uint8_t *cart_ram;
+};
+
+/**
+ * Returns a byte from the ROM file at the given address.
+ */
+uint8_t gb_rom_read(struct gb_s *gb, const uint_fast32_t addr)
+{
+	const struct priv_t * const p = gb->direct.priv;
+	return p->rom[addr];
+}
+
+/**
+ * Returns a byte from the cartridge RAM at the given address.
+ */
+uint8_t gb_cart_ram_read(struct gb_s *gb, const uint_fast32_t addr)
+{
+	const struct priv_t * const p = gb->direct.priv;
+	return p->cart_ram[addr];
+}
+
+/**
+ * Writes a given byte to the cartridge RAM at the given address.
+ */
+void gb_cart_ram_write(struct gb_s *gb, const uint_fast32_t addr,
+		       const uint8_t val)
+{
+	const struct priv_t * const p = gb->direct.priv;
+	p->cart_ram[addr] = val;
+}
+
+/**
+ * Ignore all errors.
+ */
+void gb_error(struct gb_s *gb, const enum gb_error_e gb_err, const uint16_t val)
+{
+#if 0
+	const char* gb_err_str[4] =
+		{
+			"UNKNOWN",
+			"INVALID OPCODE",
+			"INVALID READ",
+			"INVALID WRITE"
+		};
+	fprintf(stderr, "Error %d occurred: %s\n. Abort.\n",
+		gb_err,
+		gb_err >= GB_INVALID_MAX ?
+		gb_err_str[0] : gb_err_str[gb_err]);
+	abort();
+#endif
+}
+
+void gb_serial_tx(struct gb_s *gb, const uint8_t tx)
+{
+	(void) gb;
+	printf("0x%02X ", tx);
+}
+
+enum gb_serial_rx_ret_e gb_serial_rx(struct gb_s *gb, uint8_t *rx)
+{
+	(void) gb;
+	(void) rx;
+	return GB_SERIAL_RX_NO_CONNECTION;
+}
 
 int main(void)
 {
+	static struct gb_s gb;
+	static struct priv_t priv = { .rom = rom, .cart_ram = NULL };
+	enum gb_init_error_e ret;
+
 	puts("Hello World!");
 
+	/* Initialise context. */
+	ret = gb_init(&gb, &gb_rom_read, &gb_cart_ram_read,
+		      &gb_cart_ram_write, &gb_error, &priv);
+
+	if(ret != GB_INIT_NO_ERROR)
+	{
+		printf("Error: %d\n", ret);
+		goto sleep;
+	}
+
+#if ENABLE_LCD
+	//gb_init_lcd(&gb, &lcd_draw_line);
+	// gb.direct.interlace = 1;
+#endif
+
+	gb_init_serial(&gb, gb_serial_tx, gb_serial_rx);
+
+	while(1)
+		gb_run_frame(&gb);
+
 	/* Sleep forever. */
+sleep:
 	while(1)
 		__wfi();