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1.使用摄像头型号ov9650
①修改、配置内核
1.修改vi drivers/i2c/busses/Kconfig
(参考实验二十六 I2C驱动编写及测试)
修改
config I2C_S3C2410
tristate "S3C2410 I2C Driver"
depends on ARCH_S3C2410 || ARCH_S3C64XX
help
Say Y here to include support for I2C controller in the
Samsung S3C2410 based System-on-Chip devices.
为:
config I2C_S3C2410
tristate "S3C2410 I2C Driver"
depends on ARCH_S3C2410 || ARCH_S3C64XX || ARCH_S5PC100
help
Say Y here to include support for I2C controller in the
Samsung S3C2410 based System-on-Chip devices.
配置内核驱动:
$ make menuconfig
Device Drivers --->
<*> I2C support --->
<*> I2C device interface
I2C Hardware Bus support --->
<*> S3C2410 I2C Driver
修改arch/arm/mach-s5pc100/mach-smdkc100.c
查看原理图可以知道我们的摄像头是接在I2C-1上所以修改i2c_devs1添加ov9650的内容,主要是ov9650的地址,这个在芯片手册上可以查到是0x30
修改:
static struct i2c_board_info i2c_devs1[] __initdata = {
};
为:
static struct i2c_board_info i2c_devs1[] __initdata = {
{
I2C_BOARD_INFO("ov9650", 0x30),
},
};
添加s5pc100 摄像头控制器平台设备相关内容,这些内容我们可以通过查看S5PC100的芯片手册查到.
static struct resource s3c_camif_resource[] = {
[0] = {
.start = 0xEE200000,
.end = 0xEE200000 + SZ_1M - 1,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = IRQ_FIMC0,
.end = IRQ_FIMC0,
.flags = IORESOURCE_IRQ,
}
};
static u64 s3c_device_camif_dmamask = 0xffffffffUL;
struct platform_device s3c_device_camif = {
.name = "s5pc100-camif",
.id = 0,
.num_resources = ARRAY_SIZE(s3c_camif_resource),
.resource = s3c_camif_resource,
.dev = {
.dma_mask = &s3c_device_camif_dmamask,
.coherent_dma_mask = 0xffffffffUL
}
};
EXPORT_SYMBOL(s3c_device_camif);
注册摄像头控制平台设备:
在smdkc100_devices中添加s3c_device_camif.
static struct platform_device *smdkc100_devices[] __initdata = {
&s3c_device_camif, //添加内容
};
添加驱动(video):
Make menuconfig
Device Drivers --->
<*> Multimedia support --->
<*> Video For Linux
[*] Enable Video For Linux API 1 (DEPRECATED) (NEW)
[*] Video capture adapters (NEW) --->
[*] V4L USB devices (NEW) ---> make
<*> USB Video Class (UVC)
[*] UVC input events device support (NEW)
<*> USB ZC0301[P] webcam support (DEPRECATED)
②重新编译内核
make zImage
cp arch/arm/boot/zImage /tftpboot
2.使用摄像头型号ZC3XX
1、配置内核是内核支持芯片为ZC3xx的摄像头(必须先配置USB驱动,否则[*] V4L USB devices (NEW) --->出不来)
Make menuconfig
Device Drivers --->
<*> Multimedia support
--->
<*> Video For Linux
[*] Enable Video For Linux API 1 (DEPRECATED) (NEW)
[*] Video capture adapters (NEW) --->
[*] V4L USB
devices (NEW) --->
<*> GSPCA based webcams--->
<*>
ZC3XX USB Camera Driver
<*>
USB Video Class (UVC)
[*] UVC input events device support (NEW)
<*> USB ZC0301[P] webcam support
(DEPRECATED)
2、重新编译内核
修改文件drivers/media/video/gspac/gspca.c添加红色语句:
220
goto error_buffer;
221
}
urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
222
usb_fill_int_urb(urb, dev,
223
usb_rcvintpipe(dev, ep->
make zImage重新编译内核
通过上面两个步骤就可以驱动我们的摄像头了。但是这个驱动是基于V4l2的。以前基于V4L的一些上层应用就不能用了,或需要做大量的修改!这里我们要实现网络视频的功能,以前都是用servfox这个网络视频服务器,但是这个服务器就是基于V4L的,我们如果想用的话就得对servfox的源码进行修改。这里我们选用另外一种方案mjpg-stream。