@CHIP-RTOS C Library V2.06 - Hardware API Structures
Dma_Info data structure
DMA Info data structure typedef struct Dma_Info_
{
unsigned count;
union
{
void far *mem;
unsigned int io;
}
src;
union
{
void far *mem;
unsigned int io;
}
dest;
unsigned ctrl_reg;
} Dma_Info ;
Members
count
- DMA counter (bytes which have to be transfered)
src
- Data source
dest
- Data destination
ctrl_reg
-
Control Register:
Bit 0: 1=Priority for the channel / 0=Priority for the other channel
Bit 1: 1=Source synchronized / 0=No source synchronization
Bit 2: 1=Destination synchronized / 0=No destination synchronization
Bit 3: 1=Use interrupt at end of transfer / 0=do not use an interrupt
Bit 4: must be set to '1'
Bit 5: 1=Source address increment / 0=No increment of source address
Bit 6: 1=Source address decrement / 0=No decrement of source Address
Bit 7: 1=Source is in memory space / 0=Source is in IO space
Bit 8: 1=Destination address increment /
0=No increment of destination address
Bit 9: 1=Destination address decrement / 0=No decrement of destination address
Bit 10: 1=Destination is in memory space / 0=Destination is in IO space
Bit 11: 1=Word Transfer / 0=Byte Transfer
Comments
- The source and destination pointers are either far pointers to memory
or a 16 bit I/O address. If ctrl_reg
bit 7
(DMA_SRCMEM
) is set
then src
is a far memory pointer, otherwise it is a
16 bit I/O address. Likewise if ctrl_reg
bit 10
(DMA_DESTMEM
) is set
then dest
is a far memory pointer, otherwise it is a
16 bit I/O address.
See Also
Supported since or modified in @CHIP-RTOS version-
SC12 | SC13 | SC11 | SC1x3 |
-
V1.02 | V1.00 | V1.00 | V0.90 |
This API List
List of C Libraries
@CHIP-RTOS Main Index
End of document
|