fs4412开发板学习笔记(九)

最新推荐文章于 2025-06-23 21:28:07 发布

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最新推荐文章于 2025-06-23 21:28:07 发布

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分类专栏：嵌入式

本文链接：https://blog.youkuaiyun.com/w_816_y/article/details/49456603

本文记录了在fs4412开发板上的学习过程，包括硬件连接、基础操作、程序烧录以及一些实用技巧，旨在帮助初学者快速上手并理解开发板的潜在应用。

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分析linux-3.0-fs4412_v7的fimc是如何调用ov3640的:

cp arch/arm/boot/uImage /tftpboot/uImage_3.14.29

系统启动时的信息：
[    4.137178] FIMC0 registered successfully
[    4.141076] FIMC1 registered successfully
[    4.145056] FIMC2 registered successfully
[    4.149059] FIMC3 registered successfully

\linux-3.0-fs4412_v7\drivers\media\video\samsung\fimc\Fimc_dev.c  1768

platform_driver_register(&fimc_driver);

static int __devinit fimc_probe(struct platform_device *pdev)
{
    /* V4L2 device-subdev registration */
    ret = v4l2_device_register(&pdev->dev, &ctrl->v4l2_dev);//初始化v4l2_device结构

    /* things to initialize once */
    ret = fimc_init_global(pdev);
    这里面会完成摄像头的分配以及时钟的获取
    这个platform_device是内核从平台代码那里传递过来的，
    里面包含的就是和具体平台相关的信息，其中就应该包含摄像头信息。

    /* video device register */
    ret = video_register_device(ctrl->vd, VFL_TYPE_GRABBER, ctrl->id);

    video_set_drvdata(ctrl->vd, ctrl);

    ret = device_create_file(&(pdev->dev), &dev_attr_log_level);

    ret = device_create_file(&(pdev->dev), &dev_attr_range_mode);

    printk(KERN_INFO "FIMC%d registered successfully\n", ctrl->id);//是在这里打印.
}


相机启动拍照信息(1)：
<4>[  145.909856] s3c-fimc0: FIMC0 1 opened.                        
                        //ov3640驱动开始:
<6>[  145.910423] OV3640 7-003c: fetching platform data
<6>[  145.910444] OV3640 7-003c: parallel mode
<6>[  145.910462] OV3640 7-003c: ov3640 has been probed
<6>[  145.910884] OV3640 7-003c: ov3640_init: camera initialization start
<4>[  145.910901] leesheen : sensor is power on
                                  ||
                  \/
=============================================================
\linux-3.0-fs4412_v7\drivers\media\video\samsung\fimc\Fimc_dev.c
static int fimc_open(struct file *filp)
{
    if (in_use >= max_use) {
        ret = -EBUSY;
        goto resource_busy;
    } else {
        atomic_inc(&ctrl->in_use);
        fimc_warn("FIMC%d %d opened.\n", ctrl->id, atomic_read(&ctrl->in_use));//打印第一条信息
    }
}
=================//ov3640.c
static int ov3640_s_config(struct v4l2_subdev *sd, int irq, void *platform_data)
{
    struct i2c_client *client = v4l2_get_subdevdata(sd);
    struct ov3640_state *state = to_state(sd);
    struct ov3640_platform_data *pdata;

    dev_info(&client->dev, "fetching platform data\n");//打印第二条信息

    pdata = client->dev.platform_data;
    if (!pdata->is_mipi)
    {
        state->is_mipi = 0;
        dev_info(&client->dev, "parallel mode\n");//打印第三条信息
    }
}
static int ov3640_probe(struct i2c_client *client,
        const struct i2c_device_id *id)
{
    struct ov3640_state *state;
    struct v4l2_subdev *sd;
    int ret = 0;

    state = kzalloc(sizeof(struct ov3640_state), GFP_KERNEL);
    if (state ==