IDMA3 (C64P)


Detailed Description

The IDMA3 interface enables algorithms to request and receive handles representing private logical DMA resources.


Data Structures

struct  IDMA3_MemRec
 Record containing attributes of the IDMA3 Channel environment memory when (optionally) the IDMA3 Channel is requested with a non-NULL IDMA3_ProtocolObj. More...
struct  IDMA3_ChannelRec
 DMA Channel Descriptor to logical DMA channels. More...
struct  IDMA3_Fxns
 These fxns are used to query/grant the DMA resources requested by the algorithm at initialization time, and to change these resources at runtime. All these fxns are implemented by the algorithm, and called by the client of the algorithm. More...
struct  IDMA3_ProtocolObj
 These functions are used to determine memory requirements for and initialize the IDMA3 protocol's environment that will be allocated by the DMA manager. More...
struct  IDMA3_Obj
 IDMA3_Obj holds the private state associated with each logical DMA channel. More...

Defines

#define IDMA3_PROTOCOL_NULL   ((IDMA3_ProtocolHandle)NULL)
 NULL protocol definition.

Typedefs

typedef IDMA3_ObjIDMA3_Handle
 Handle to "logical" DMA channel.
typedef IDMA3_ProtocolObjIDMA3_ProtocolHandle
 Handle to IDMA3 protocol object.

Enumerations

enum  IDMA3_MemType {
  IDMA3_INTERNAL,
  IDMA3_EXTERNAL
}
 Memory space descriptors for IDMA3_MemRec. More...
enum  IDMA3_Priority {
  IDMA3_PRIORITY_URGENT,
  IDMA3_PRIORITY_HIGH,
  IDMA3_PRIORITY_MEDIUM,
  IDMA3_PRIORITY_LOW
}
 IDMA3 Priority Levels. More...


Define Documentation

#define IDMA3_PROTOCOL_NULL   ((IDMA3_ProtocolHandle)NULL)

NULL protocol definition.

The NULL protocol can be used when no protocol is needed, e.g. when the algorithm directly accesses the eDMA PaRAM registers, or when the DMA driver library used does not retain any state. When the NULL protocol is used 'env' buffer is not allocated


Typedef Documentation

typedef struct IDMA3_Obj* IDMA3_Handle

Handle to "logical" DMA channel.

typedef struct IDMA3_ProtocolObj* IDMA3_ProtocolHandle

Handle to IDMA3 protocol object.


Enumeration Type Documentation

enum IDMA3_MemType

Memory space descriptors for IDMA3_MemRec.

Enumerator:
IDMA3_INTERNAL  Internal data memory.
IDMA3_EXTERNAL  External data memory.

enum IDMA3_Priority

IDMA3 Priority Levels.

Enumerator:
IDMA3_PRIORITY_URGENT 
IDMA3_PRIORITY_HIGH 
IDMA3_PRIORITY_MEDIUM 
IDMA3_PRIORITY_LOW 


Copyright 2009, Texas Instruments Incorporated