42 lines
1007 B
Markdown
42 lines
1007 B
Markdown
# 图像传感器
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## 传感器介绍
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| 传感器信号 | 传感器说明 | 驱动支持 | 传感器外形 |
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| --- | --- | --- | --- |
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| OV7670 | 最大支持 40x480，30万像素，不支持 JPEG 输出，不支持自动对焦 | 已支持 |  |
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| OV2640 | 最大支持 1600x1200，200万像素，支持 JPEG 输出，不支持自动对焦 | 待支持 |  |
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## 使用说明
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本系统支持 dev fs，camera 设备会在 /dev 下面注册。
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相关数据结构：
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```c
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enum CameraOutputFormat {
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RGB565,
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JPEG,
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};
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struct CameraInfo {
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int width;
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int height;
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CameraOutputFormat format;
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};
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```
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基本使用说明：
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```c
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// open camera device
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int fd = open(“/dev/cam1”);
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// get camera info
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struct CameraInfo cam_info;
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int ret = ioctl(fd, GET_INFO, &cam_info);
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// read camera data to buf
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void *buf = malloc(cam_info.width * cam_info.height * 2); // assume the format is RGB565
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int ret = read(fd, buf, size);
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```
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