Initial commit

src/snes/dma.h

@@ -0,0 +1,57 @@
+
+#ifndef DMA_H
+#define DMA_H
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+typedef struct Dma Dma;
+
+#include "snes.h"
+
+typedef struct DmaChannel {
+  uint8_t bAdr;
+  uint16_t aAdr;
+  uint8_t aBank;
+  uint16_t size; // also indirect hdma adr
+  uint8_t indBank; // hdma
+  uint16_t tableAdr; // hdma
+  uint8_t repCount; // hdma
+  uint8_t unusedByte;
+  bool dmaActive;
+  bool hdmaActive;
+  uint8_t mode;
+  bool fixed;
+  bool decrement;
+  bool indirect; // hdma
+  bool fromB;
+  bool unusedBit;
+  bool doTransfer; // hdma
+  bool terminated; // hdma
+  uint8_t offIndex;
+} DmaChannel;
+
+struct Dma {
+  Snes* snes;
+  DmaChannel channel[8];
+  uint16_t hdmaTimer;
+  uint32_t dmaTimer;
+  bool dmaBusy;
+};
+
+Dma* dma_init(Snes* snes);
+void dma_free(Dma* dma);
+void dma_reset(Dma* dma);
+uint8_t dma_read(Dma* dma, uint16_t adr); // 43x0-43xf
+void dma_write(Dma* dma, uint16_t adr, uint8_t val); // 43x0-43xf
+void dma_doDma(Dma* dma);
+void dma_initHdma(Dma* dma);
+void dma_doHdma(Dma* dma);
+bool dma_cycle(Dma* dma);
+void dma_startDma(Dma* dma, uint8_t val, bool hdma);
+void dma_saveload(Dma *dma, SaveLoadFunc *func, void *ctx);
+
+#endif