home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
OS/2 Shareware BBS: 10 Tools
/
10-Tools.zip
/
cdisk.zip
/
DMA
/
DMA.H
< prev
next >
Wrap
Text File
|
1992-07-06
|
1KB
|
47 lines
/* mmap.h DMA Channel data structure */
typedef struct _DMACh {
UCHAR Filler; /* force all fields aligned */
/* boundaries */
UCHAR PageSelect; /* page select */
USHORT BaseAddress; /* base address */
USHORT WordCount; /* word count */
} DMACh;
/* DMA Channel 5 */
#define DMA_PAGE_SELECT_5 0x8B
#define DMA_BASE_ADDRESS_5 0xC4
#define DMA_WORD_COUNT_5 0xC6
/* DMA Channel 6 */
#define DMA_PAGE_SELECT_6 0x89
#define DMA_BASE_ADDRESS_6 0xC8
#define DMA_WORD_COUNT_6 0xCA
/* DMA Channel 7 */
#define DMA_PAGE_SELECT_7 0x8A
#define DMA_BASE_ADDRESS_7 0xCC
#define DMA_WORD_COUNT_7 0xCE
/* Other DMA Registers */
#define DMA_REFRESH_CHANNEL 0x8F
#define DMA_MASK_REGISTER 0xD4
#define DMA_MODE_REGISTER 0xD6
#define DMA_BYTE_POINTER_FLIPFLOP 0xD8
#define DMA_MASTER_RESET 0xDA
#define DMA_RESET_MASK_REGISTER 0xDC
/* DMA Mode Flag Bit Definitions */
#define DMA_WRITE 0x04 /* write transfer */
#define DMA_READ 0x08 /* read transfer */
#define DMA_AUTOINIT 0x10 /* autoinit enabled */
#define DMA_DECREMENT 0x20 /* address dec selected */
#define DMA_SINGLE 0x40 /* SINGLE mode selected */
#define DMA_BLOCK 0x80 /* BLOCK mode selected */
#define DMA_CASCADE 0xC0 /* CASCADE mode selected */