From b5397045db290c234a1e779b64538933f93b37b6 Mon Sep 17 00:00:00 2001
From: Oxore <oxore@protonmail.com>
Date: Mon, 3 Oct 2022 02:05:09 +0300
Subject: Begin implementing DMA: impl memory to VRAM

---
 vdp.hpp | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

(limited to 'vdp.hpp')

diff --git a/vdp.hpp b/vdp.hpp
index 9357377..030b38e 100644
--- a/vdp.hpp
+++ b/vdp.hpp
@@ -57,8 +57,8 @@ class VDP {
             kScrollSize = 16,
             kWindowHorizontalPosition = 17,
             kWindowVertialPosition = 18,
-            kDMACounterLow = 19,
-            kDMACounterHigh = 20,
+            kDMALengthCounterLow = 19,
+            kDMALengthCounterHigh = 20,
             kDMASourceAddressLow = 21,
             kDMASourceAddressMid = 22,
             kDMASourceAddressHigh = 23,
@@ -69,10 +69,18 @@ class VDP {
         void writeControl(uint16_t value);
         uint16_t readData(uint8_t address_mode, uint16_t address);
         uint16_t readStatusRegister() const;
-
+        uint8_t* baseFromAddressMode(uint8_t address_mode);
         const char* addressModeToString(uint8_t address_mode);
         const char* regIDToString(RegID);
 
+        static void runDMAMemoryToVRAM(
+                uint8_t* base,
+                uint32_t source_address,
+                uint16_t destination_address,
+                uint16_t transfer_size);
+        static void runDMAVRAMFill(uint8_t* base);
+        static void runDMAVRAMCopy(uint8_t* base);
+
         static constexpr size_t kRegistersCount = static_cast<size_t>(RegID::kRegistersCount);
         static constexpr size_t kVRAMSize = 64*1024;
         static constexpr size_t kCRAMSize = 64*2;
-- 
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