From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
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单点采集DMA模式时,允许PC硬件通过一个DMA通道传输多个字节,只需要对DMA控制器单次编程即可。单次循环DMA,每传一个字长的数据都需要对DMA控制器编程。这样就使得单次循环DMA模式比单D点采集DMA模式运行速度慢,因为在数据传输过程中,不同进程获得DMA控制器需要一段时间。
我们的GPIB驱动一般都使用单点采集DMA模式来进行DMA传输,但是一些电脑不支持该模式。在这种情况下,就需要换成单次循环DMA模式。
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