xc7a100t xdma发送数据代码

以下是基于 Xilinx 官方提供的 XDMA 驱动库的 XC7A100T XDMA 发送数据的 C 语言代码示例：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include <errno.h>
#include <string.h>
#include <stdbool.h>
#include <stdint.h>

/* Xilinx XDMA device driver constants */
#define XDMA_DEVICE_NAME "/dev/xdma"
#define XDMA_IOCTL_MAGIC 'W'
#define XDMA_START_TRANSFER _IO(XDMA_IOCTL_MAGIC, 0)
#define XDMA_WAIT_TRANSFER _IO(XDMA_IOCTL_MAGIC, 1)

/* Xilinx XDMA transfer descriptor structure */
struct xdma_transfer {
    uint64_t buffer_addr;
    uint32_t length;
};

int main(int argc, char *argv[]) {
    int xdma_fd;
    struct xdma_transfer xdma_transfer_desc;
    uint32_t *buffer_ptr;
    int buffer_size = 1024; /* Change this to your desired buffer size */
    int i;

    /* Open XDMA device driver file descriptor */
    xdma_fd = open(XDMA_DEVICE_NAME, O_RDWR);
    if (xdma_fd < 0) {
        fprintf(stderr, "Error: Failed to open XDMA device driver: %s\n",
                strerror(errno));
        return -1;
    }

    /* Map buffer into virtual address space */
    buffer_ptr = (uint32_t *) mmap(NULL, buffer_size, PROT_READ | PROT_WRITE,
                                   MAP_SHARED | MAP_ANONYMOUS, -1, 0);
    if (buffer_ptr == MAP_FAILED) {
        fprintf(stderr, "Error: Failed to map buffer: %s\n", strerror(errno));
        close(xdma_fd);
        return -1;
    }

    /* Initialize buffer with test data */
    for (i = 0; i < buffer_size / sizeof(uint32_t); i++) {
        buffer_ptr[i] = i;
    }

    /* Set up XDMA transfer descriptor */
    xdma_transfer_desc.buffer_addr = (uint64_t) buffer_ptr;
    xdma_transfer_desc.length = buffer_size;

    /* Start XDMA transfer */
    if (ioctl(xdma_fd, XDMA_START_TRANSFER, &xdma_transfer_desc) < 0) {
        fprintf(stderr, "Error: Failed to start XDMA transfer: %s\n",
                strerror(errno));
        munmap(buffer_ptr, buffer_size);
        close(xdma_fd);
        return -1;
    }

    /* Wait for XDMA transfer to complete */
    if (ioctl(xdma_fd, XDMA_WAIT_TRANSFER, NULL) < 0) {
        fprintf(stderr, "Error: Failed to wait for XDMA transfer: %s\n",
                strerror(errno));
    }

    /* Unmap buffer and close XDMA device driver file descriptor */
    munmap(buffer_ptr, buffer_size);
    close(xdma_fd);

    return 0;
}

该代码中通过 XDMA 设备驱动进行了数据传输，需要注意的是需要先在 FPGA 中配置好相应的 XDMA IP 核，并在 Linux 中加载对应的 XDMA 驱动。具体使用方法可以参考 Xilinx 官方文档和示例代码。