Plx使用手册学习----9 PlxPci_DmaChannelOpen

最新推荐文章于 2022-05-19 18:41:39 发布

翻译最新推荐文章于 2022-05-19 18:41:39 发布 · 638 阅读

文章标签：

#Plx

VC++ 专栏收录该内容

36 篇文章

订阅专栏

本文详细介绍了PLX_PCI_DMA_CHANNEL_OPEN函数的使用方法，该函数用于打开并初始化DMA通道，为后续的数据传输做准备。从SDK6.10开始，推荐将pDmaProp参数设为NULL，并利用其他PLX API进行DMA属性的获取和更新。文章还提供了函数的语法、支持的PLX芯片型号、参数说明及返回代码示例。

Syntax:

PLX_STATUS
PlxPci_DmaChannelOpen(
PLX_DEVICE_OBJECT *pDevice,
U8 channel,
PLX_DMA_PROP *pDmaProp
);

PLX Chip Support:
9054, 9056, 9080, 9656, 8311, & 8000 DMA
Description:
Opens and initializes a DMA channel to prepare for later transfers.

打开并初始化一个DMA通道，为以后的传输做准备。

Starting with SDK 6.10, it is recommended to set the pDmaProp parameter to NULL and use other PLX APIs to retrieve and update DMA properties.

从sdk 6.10开始，建议将pdmapop参数设置为空，并使用其他plx API来检索和更新dma属性。

Refer to PlxPci_DmaGetProperties & PlxPci_DmaSetProperties.

参阅PlxPci_DmaGetProperties 和 PlxPci_DmaSetProperties.
Parameters:
pDevice
Pointer to an open device
channel
The number of the DMA channel to open
pDmaProp
Pointer to a structure containing the properties to use for initializing the DMA channel. If this NULL, the
DMA properties will not be modified.
Return Codes:

Code	Description
ApiSuccess	The function returned successfully
ApiNullParam	One or more parameters is NULL
ApiInvalidDeviceInfo	The device object is not valid
ApiPowerDown	The PLX device is in a power state that is lower than required for this function
ApiDmaChannelInvalid	The DMA channel is not supported by the PLX chip
ApiDmaChannelUnavailable	The DMA channel is in use by another process

Usage:

// Open the DMA channel
PlxPci_DmaChannelOpen(
pDevice,
0, // Channel 0
NULL // Do not modify current DMA properties
);