| | 1 | /***************************************************************************\r |
| | 2 | dma.c - description\r |
| | 3 | -------------------\r |
| | 4 | begin : Wed May 15 2002\r |
| | 5 | copyright : (C) 2002 by Pete Bernert\r |
| | 6 | email : BlackDove@addcom.de\r |
| | 7 | ***************************************************************************/\r |
| | 8 | /***************************************************************************\r |
| | 9 | * *\r |
| | 10 | * This program is free software; you can redistribute it and/or modify *\r |
| | 11 | * it under the terms of the GNU General Public License as published by *\r |
| | 12 | * the Free Software Foundation; either version 2 of the License, or *\r |
| | 13 | * (at your option) any later version. See also the license.txt file for *\r |
| | 14 | * additional informations. *\r |
| | 15 | * *\r |
| | 16 | ***************************************************************************/\r |
| | 17 | \r |
| | 18 | #include "stdafx.h"\r |
| | 19 | \r |
| | 20 | #define _IN_DMA\r |
| | 21 | \r |
| | 22 | #include "externals.h"\r |
| | 23 | \r |
| | 24 | ////////////////////////////////////////////////////////////////////////\r |
| | 25 | // READ DMA (one value)\r |
| | 26 | ////////////////////////////////////////////////////////////////////////\r |
| | 27 | \r |
| | 28 | unsigned short CALLBACK SPUreadDMA(void)\r |
| | 29 | {\r |
| | 30 | unsigned short s=spuMem[spuAddr>>1];\r |
| | 31 | spuAddr+=2;\r |
| | 32 | if(spuAddr>0x7ffff) spuAddr=0;\r |
| | 33 | \r |
| | 34 | return s;\r |
| | 35 | }\r |
| | 36 | \r |
| | 37 | ////////////////////////////////////////////////////////////////////////\r |
| | 38 | // READ DMA (many values)\r |
| | 39 | ////////////////////////////////////////////////////////////////////////\r |
| | 40 | \r |
| | 41 | void CALLBACK SPUreadDMAMem(unsigned short *pusPSXMem, int iSize,\r |
| | 42 | unsigned int cycles)\r |
| | 43 | {\r |
| | 44 | int i;\r |
| | 45 | \r |
| | 46 | do_samples_if_needed(cycles);\r |
| | 47 | \r |
| | 48 | for(i=0;i<iSize;i++)\r |
| | 49 | {\r |
| | 50 | *pusPSXMem++=spuMem[spuAddr>>1]; // spu addr got by writeregister\r |
| | 51 | spuAddr+=2; // inc spu addr\r |
| | 52 | if(spuAddr>0x7ffff) spuAddr=0; // wrap\r |
| | 53 | }\r |
| | 54 | }\r |
| | 55 | \r |
| | 56 | ////////////////////////////////////////////////////////////////////////\r |
| | 57 | ////////////////////////////////////////////////////////////////////////\r |
| | 58 | ////////////////////////////////////////////////////////////////////////\r |
| | 59 | \r |
| | 60 | // to investigate: do sound data updates by writedma affect spu\r |
| | 61 | // irqs? Will an irq be triggered, if new data is written to\r |
| | 62 | // the memory irq address?\r |
| | 63 | \r |
| | 64 | ////////////////////////////////////////////////////////////////////////\r |
| | 65 | // WRITE DMA (one value)\r |
| | 66 | ////////////////////////////////////////////////////////////////////////\r |
| | 67 | \r |
| | 68 | void CALLBACK SPUwriteDMA(unsigned short val)\r |
| | 69 | {\r |
| | 70 | spuMem[spuAddr>>1] = val; // spu addr got by writeregister\r |
| | 71 | \r |
| | 72 | spuAddr+=2; // inc spu addr\r |
| | 73 | if(spuAddr>0x7ffff) spuAddr=0; // wrap\r |
| | 74 | }\r |
| | 75 | \r |
| | 76 | ////////////////////////////////////////////////////////////////////////\r |
| | 77 | // WRITE DMA (many values)\r |
| | 78 | ////////////////////////////////////////////////////////////////////////\r |
| | 79 | \r |
| | 80 | void CALLBACK SPUwriteDMAMem(unsigned short *pusPSXMem, int iSize,\r |
| | 81 | unsigned int cycles)\r |
| | 82 | {\r |
| | 83 | int i;\r |
| | 84 | \r |
| | 85 | do_samples_if_needed(cycles);\r |
| | 86 | \r |
| | 87 | if(spuAddr + iSize*2 < 0x80000)\r |
| | 88 | {\r |
| | 89 | memcpy(&spuMem[spuAddr>>1], pusPSXMem, iSize*2);\r |
| | 90 | spuAddr += iSize*2;\r |
| | 91 | return;\r |
| | 92 | }\r |
| | 93 | \r |
| | 94 | for(i=0;i<iSize;i++)\r |
| | 95 | {\r |
| | 96 | spuMem[spuAddr>>1] = *pusPSXMem++; // spu addr got by writeregister\r |
| | 97 | spuAddr+=2; // inc spu addr\r |
| | 98 | spuAddr&=0x7ffff; // wrap\r |
| | 99 | }\r |
| | 100 | }\r |
| | 101 | \r |
| | 102 | ////////////////////////////////////////////////////////////////////////\r |
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