Nios II Classic Software Developer’s Handbook

ID 683282
Date 5/14/2015
Public
Document Table of Contents

14.1.22. alt_dma_txchan_open()

Prototype

alt_dma_txchan alt_dma_txchan_open (const char* name)

Commonly Called By

C/C++ programs

Device drivers

Thread-safe

Yes.

Available from ISR

No.

Include

<sys/alt_dma.h>

Description

The alt_dma_txchan_open() function obtains an alt_dma_txchan() descriptor for a DMA transmit channel. The input argument, name, is the name of the associated physical device, for example, /dev/dma_0.

Return

The return value is null on failure and non-null otherwise. If an error occurs, errno is set to ENODEV.