DW_axi_dmac rt-thread 驱动源码

由于DW_axi_dmac是一款IP核，其驱动源码的具体实现可能会因具体的芯片型号、IP核版本、DMA通道数等因素而有所差异。以下是DW_axi_dmac在rt-thread中的一份示例驱动源码供参考：

#include <rtthread.h>
#include <rtdevice.h>
#include <board.h>
#include <dw_axi_dmac.h>

#define DW_AXI_DMAC_BASEADDR 0x40000000
#define DW_AXI_DMAC_IRQNUM   10
#define DW_AXI_DMAC_CHAN_NUM 8

struct dw_axi_dmac_device
{
    const char *name;
    rt_uint32_t baseaddr;
    rt_uint32_t irqnum;
    rt_uint32_t chan_num;
};

struct dw_axi_dmac_device dw_axi_dmac =
{
    .name = "dw_axi_dmac",
    .baseaddr = DW_AXI_DMAC_BASEADDR,
    .irqnum = DW_AXI_DMAC_IRQNUM,
    .chan_num = DW_AXI_DMAC_CHAN_NUM,
};

static rt_err_t dw_axi_dmac_init(rt_device_t dev)
{
    /* 初始化DW_axi_dmac硬件 */
    dw_axi_dmac_hw_init(dw_axi_dmac.baseaddr, dw_axi_dmac.irqnum, dw_axi_dmac.chan_num);
    return RT_EOK;
}

static rt_err_t dw_axi_dmac_open(rt_device_t dev, rt_uint16_t oflag)
{
    /* 打开DW_axi_dmac设备 */
    return RT_EOK;
}

static rt_err_t dw_axi_dmac_close(rt_device_t dev)
{
    /* 关闭DW_axi_dmac设备 */
    return RT_EOK;
}

static rt_size_t dw_axi_dmac_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
{
    /* 读取数据 */
    return dw_axi_dmac_read_data(dw_axi_dmac.baseaddr, buffer, size);
}

static rt_size_t dw_axi_dmac_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
{
    /* 写入数据 */
    return dw_axi_dmac_write_data(dw_axi_dmac.baseaddr, buffer, size);
}

static rt_err_t dw_axi_dmac_control(rt_device_t dev, int cmd, void *args)
{
    rt_err_t ret = RT_EOK;
    switch (cmd)
    {
        case RT_DEVICE_CTRL_CONFIG:
            /* 配置DW_axi_dmac设备 */
            break;

        case RT_DEVICE_CTRL_RESET:
            /* 重置DW_axi_dmac设备 */
            break;

        default:
            ret = RT_ERROR;
            break;
    }
    return ret;
}

static struct rt_device dw_axi_dmac_device =
{
    .type = RT_Device_Class_Char,
    .init = dw_axi_dmac_init,
    .open = dw_axi_dmac_open,
    .close = dw_axi_dmac_close,
    .read = dw_axi_dmac_read,
    .write = dw_axi_dmac_write,
    .control = dw_axi_dmac_control,
};

int rt_hw_dw_axi_dmac_init(void)
{
    rt_err_t result;
    result = rt_device_register(&dw_axi_dmac_device, dw_axi_dmac.name, RT_DEVICE_FLAG_RDWR);
    if (result == RT_EOK)
    {
        return 0;
    }
    else
    {
        return -1;
    }
}

以上代码是DW_axi_dmac在rt-thread中的一份示例驱动源码，其中包括初始化函数、打开/关闭函数、读写函数和控制函数等。其中，dw_axi_dmac_hw_init()、dw_axi_dmac_read_data()和dw_axi_dmac_write_data()等函数是DW_axi_dmac的底层驱动函数，需要根据具体的IP核版本和DMA通道数进行实现。