根据synopsys dma controller写一个dma测试程序
时间: 2023-05-18 12:06:15 浏览: 72
非常感谢您的提问。以下是一个简单的DMA测试程序,基于Synopsys DMA控制器:
#include <linux/module.h>
#include <linux/init.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
static struct dma_chan *dma_chan;
static dma_addr_t dma_handle;
static void *dma_buffer;
static int __init dma_test_init(void)
{
dma_buffer = dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_KERNEL);
if (!dma_buffer) {
printk(KERN_ERR "Failed to allocate DMA buffer\n");
return -ENOMEM;
}
dma_chan = dma_request_chan(NULL, "dma_test");
if (!dma_chan) {
printk(KERN_ERR "Failed to request DMA channel\n");
dma_free_coherent(NULL, PAGE_SIZE, dma_buffer, dma_handle);
return -ENODEV;
}
memset(dma_buffer, 0x55, PAGE_SIZE);
dma_async_memcpy_to_device(dma_chan, dma_handle, dma_buffer, PAGE_SIZE);
dma_async_issue_pending(dma_chan);
return 0;
}
static void __exit dma_test_exit(void)
{
dma_sync_single_for_cpu(NULL, dma_handle, PAGE_SIZE, DMA_TO_DEVICE);
if (memcmp(dma_buffer, "\x55\x55\x55\x55\x55\x55\x55\x55", 8)) {
printk(KERN_ERR "DMA transfer failed\n");
} else {
printk(KERN_INFO "DMA transfer successful\n");
}
dma_free_coherent(NULL, PAGE_SIZE, dma_buffer, dma_handle);
dma_release_channel(dma_chan);
}
module_init(dma_test_init);
module_exit(dma_test_exit);
MODULE_LICENSE("GPL");
希望这个程序能够帮助到您。如果您有任何问题,请随时问我。