1.用ctrl+alt+T来打开终端 2.要在某个文件夹里创建文本，首先要回到该文件夹的目录。如我在桌面(...
这是我根据MMC3加的设备树控制XDMA_EVENT_INTR2的部分。 请问相应的dma_request_channel函数和dma_request_chan函数应如何实现。我参考了下面链接的做法,但是发现得到的是软件触发的DMA通道,并不是由我希望的XDMA_EVENT_INTR2管脚控制的DMA传输,请问哪里需要改正呢? https://e2echina.ti.com/question_an...
of_dma_request_slave_channel是一个在Linux内核中用于请求DMA(Direct Memory Access)从通道的函数。DMA允许硬件设备直接访问主内存,而无需CPU的干预,从而提高了数据传输的效率。该函数通常用于基于设备树(Device Tree)的系统,用于根据提供的参数(如设备树中的节点和通道名称)获取一个DMA从通道的句柄,以便后续进行DMA...
root@dmaTest:/lib/modules/4.6.0-xilinx/extra# insmod axidma.ko axidma: axidma_dma.h: axidma_request_channels: 621: Unable to get slave channel 0: tx_channel. axidma: probe of axidma_chrdev@0 failed with error -38 And my device tree of dma part is: axidma_chrdev: axidma_chrdev...
Two DMA request signals(DMA_req1, DMA_req2) are generated, the first DMA channel(123-1) is opened by the first DMA request signal(DMA_req1), and data are exchanged. In addition, the second DMA channel(123-2) is opened by the second DMA request signal(DMA_req2), and data are ...
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detected. A transfer request can be triggered from software, from an external trigger source (peripheral) or from an event. There are dedicated source trigger selections for each DMA channel. The available trigger sources may vary from one device to anoth 当DMA调动请求被查出时, DMA调动可能只...
Previously we could have three active audio devices all thinking they had access to DMA channel 1. For example: [dosbox] machine = tandy [sblaster] sbtype = sb1 dma = 1 [gus] gus = on gusdma = 1 [speaker] tandy = on (the DAC runs on DMA 1) Unfortunately only one device will ...
DMA rx channel request failed, **operating without rx DMA** If you were to add DMA channels, you would use the "dmas" and "dma-names" device tree properties. Read the documentation for more details: https://elixir.bootlin.com/linux/v5.9/source/Documentation/devicetree/bindings/seri...
- dma_cap_mask_t mask; struct device *sdev = dspi->bitbang.master->dev.parent; - int r; - - dma_cap_zero(mask); - dma_cap_set(DMA_SLAVE, mask); - dspi->dma_rx = dma_request_channel(mask, edma_filter_fn, - &dspi->dma_rx_chnum); ...