---
title: startDMACommand
framework: kernel
role: symbol
role_heading: Instance Method
path: kernel/iodmaeventsource/1589928-startdmacommand
---

# startDMACommand

## Declaration

```occ
virtual IOReturn startDMACommand(IODMACommand *dmaCommand, IODirection direction, IOByteCount byteCount, IOByteCount byteOffset);
```