Analog Devices VisualDSP++ 5.0 Service Manual page 278

DMA Manager API Reference
The set of commands that can be issued using the
function is defined in
Prototype
ADI_DMA_RESULT adi_dma_Control(
ADI_DMA_CHANNEL_HANDLE
ADI_DMA_CM
void
);
Arguments
ChannelHandle
Command
Value
Return Value
ADI_DMA_RESULT_SUCCESS
ADI_DMA_RESULT_BAD_COMMAND
ADI_DMA_RESULT_ALREADY_RUNNING
6-38
"DMA Commands" on page
Uniquely identifies the DMA channel the buffer is assigned to and is the
value returned when the DMA channel is opened
enumeration value. See
ADI_DMA_CMD
a full list of commands.
Depending on the value for
• If has the value
Command
the system issues the address of a single
ADI_DMA_CMD_VALUE_PAIR
• If has the value
Command
the address of an array of
specifying one or more commands. The last entry in the table must
be
{ADI_DMA_CMD_END,NULL}
• For any other value,
cessed and
Value
case of a command that queries a value, the value of the setting is
stored at the location pointed to by the pointer
Function completed successfully.
Command is invalid. Either a bad command or a spe-
cific command is not allowed in this context.
Commands could not be performed as the channel is
currently transferring data.
VisualDSP++ 5.0 Device Drivers and System
adi_dma_Control
6-62.
ChannelHandle,
Command,
*Value
"DMA Commands" on page 6-62
, this parameter is one of the following:
Command
ADI_DMA_CM_VALUE_PAIR
element specifying the command.
ADI_DMA_CMD_TABLE
ADI_DMA_CMD_VALUE_PAIR
.
specifies the command to be pro-
Command
is the associated value for the command. In the
Services Manual for Blackfin Processors
for
,
, the system issues
elements
.
Value