gbasys

annotate src/dma.c @ 0:875ef6085efc

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author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 04 Mar 2012 04:04:25 +0200
parents
children c50064b181c2
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nuclear@0 1 /*
nuclear@0 2 Copyright 2004 John Tsiombikas <nuclear@siggraph.org>
nuclear@0 3
nuclear@0 4 This file is part of libgba, a library for GameBoy Advance development.
nuclear@0 5
nuclear@0 6 This program is free software; you can redistribute it and/or modify
nuclear@0 7 it under the terms of the GNU General Public License as published by
nuclear@0 8 the Free Software Foundation; either version 2 of the License, or
nuclear@0 9 (at your option) any later version.
nuclear@0 10
nuclear@0 11 This program is distributed in the hope that it will be useful,
nuclear@0 12 but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@0 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
nuclear@0 14 GNU General Public License for more details.
nuclear@0 15
nuclear@0 16 You should have received a copy of the GNU General Public License
nuclear@0 17 along with this program; if not, write to the Free Software
nuclear@0 18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
nuclear@0 19 */
nuclear@0 20
nuclear@0 21 #include "libgba_config.h"
nuclear@0 22 #include "dma.h"
nuclear@0 23
nuclear@0 24 /* DMA Options */
nuclear@0 25 #define DMA_ENABLE 0x80000000
nuclear@0 26 #define DMA_INT_ENABLE 0x40000000
nuclear@0 27 #define DMA_TIMING_IMMED 0x00000000
nuclear@0 28 #define DMA_TIMING_VBLANK 0x10000000
nuclear@0 29 #define DMA_TIMING_HBLANK 0x20000000
nuclear@0 30 #define DMA_TIMING_DISPSYNC 0x30000000
nuclear@0 31 #define DMA_16 0x00000000
nuclear@0 32 #define DMA_32 0x04000000
nuclear@0 33 #define DMA_REPEAT 0x02000000
nuclear@0 34 #define DMA_SRC_INC 0x00000000
nuclear@0 35 #define DMA_SRC_DEC 0x00800000
nuclear@0 36 #define DMA_SRC_FIX 0x01000000
nuclear@0 37 #define DMA_DST_INC 0x00000000
nuclear@0 38 #define DMA_DST_DEC 0x00200000
nuclear@0 39 #define DMA_DST_FIX1 0x00400000
nuclear@0 40 #define DMA_DST_RELOAD 0x00600000
nuclear@0 41
nuclear@0 42 /* DMA Register Parts */
nuclear@0 43 #define DMA_SRC 0
nuclear@0 44 #define DMA_DST 1
nuclear@0 45 #define DMA_CTRL 2
nuclear@0 46
nuclear@0 47 static volatile unsigned long *reg_dma[4] = {(void*)0x040000b0, (void*)0x040000bc, (void*)0x040000c8, (void*)0x040000d4 };
nuclear@0 48
nuclear@0 49 /* --- perform a copy of words or halfwords using DMA --- */
nuclear@0 50
nuclear@0 51 void dma_copy32(int channel, void *dst, void *src, int words) {
nuclear@0 52 reg_dma[channel][DMA_SRC] = (unsigned long)src;
nuclear@0 53 reg_dma[channel][DMA_DST] = (unsigned long)dst;
nuclear@0 54 reg_dma[channel][DMA_CTRL] = words | DMA_TIMING_IMMED | DMA_32 | DMA_ENABLE;
nuclear@0 55 }
nuclear@0 56
nuclear@0 57 void dma_copy16(int channel, void *dst, void *src, int halfwords) {
nuclear@0 58 reg_dma[channel][DMA_SRC] = (unsigned long)src;
nuclear@0 59 reg_dma[channel][DMA_DST] = (unsigned long)dst;
nuclear@0 60 reg_dma[channel][DMA_CTRL] = halfwords | DMA_TIMING_IMMED | DMA_16 | DMA_ENABLE;
nuclear@0 61 }
nuclear@0 62
nuclear@0 63 /* --- fill a buffer with an ammount of words and halfwords using DMA --- */
nuclear@0 64
nuclear@0 65 void dma_fill32(int channel, void *dst, unsigned long val, int words) {
nuclear@0 66 unsigned long valmem = val;
nuclear@0 67 reg_dma[channel][DMA_SRC] = (unsigned long)&valmem;
nuclear@0 68 reg_dma[channel][DMA_DST] = (unsigned long)dst;
nuclear@0 69 reg_dma[channel][DMA_CTRL] = words | DMA_SRC_FIX | DMA_TIMING_IMMED | DMA_32 | DMA_ENABLE;
nuclear@0 70 }
nuclear@0 71
nuclear@0 72 void dma_fill16(int channel, void *dst, unsigned short val, int halfwords) {
nuclear@0 73 unsigned short valmem = val;
nuclear@0 74 reg_dma[channel][DMA_SRC] = (unsigned long)&valmem;
nuclear@0 75 reg_dma[channel][DMA_DST] = (unsigned long)dst;
nuclear@0 76 reg_dma[channel][DMA_CTRL] = halfwords | DMA_SRC_FIX | DMA_TIMING_IMMED | DMA_16 | DMA_ENABLE;
nuclear@0 77 }