Analog Devices VisualDSP++ 5.0 Service Manual page 12

Contents
Controlling DMA Channels .................................................. 6-10
Opening DMA Channels .................................................. 6-11
Single Transfers ............................................................ 6-12
Circular Transfers ......................................................... 6-14
Large Descriptor Chaining Model ................................. 6-16
Small Descriptor Chaining Model ................................. 6-20
Arrays of Descriptors .................................................... 6-20
Configuring a DMA Channel ........................................... 6-20
Closing a DMA Channel .................................................. 6-21
Transfer Completions ............................................................ 6-21
Polling ............................................................................. 6-22
Callbacks .......................................................................... 6-22
Memory Stream Callbacks ............................................ 6-22
Circular Transfer Callbacks ........................................... 6-23
Descriptor Callbacks ..................................................... 6-23
Descriptor-Based Sub-Modes ................................................. 6-24
Loopback Sub-Mode ......................................................... 6-24
Streaming Sub-Mode ........................................................ 6-25
DMA Channel to Peripheral Mapping ................................... 6-26
Sensing a Mapping ........................................................... 6-27
Setting a Mapping ............................................................ 6-27
xii VisualDSP++ 5.0 Device Drivers and System
Services Manual for Blackfin Processors