开发板作模拟网卡(RNDIS)与串口
首先配置内核 , 进入LINUX内核文件夹,输入命令
make menuconfig
对内核做如下配置
选择 Device Drivers -->
[*]USB support -->
<*>USB Gadget Support -->
<M>USB Gadget Drivers
....................................
<M>Ethernet Gadget (with CDC Ethernet support)
[*] RNDIS support
...................................
<M>CDC Composite Device (Ethernet and ACM)
编译内核
make uImage ARCH=arm CROSS_COMPILE=arm-linux-
配置完之后，插在windows下，没反应。原因是对应的USB_EN引脚没有置高电平，所以检测不了。
下面对内核做修改
static struct platform_device *smdk2440_devices[] __initdata = {
&s3c_device_usb,
/**add to use mmc/sd**/
&s3c_device_sdi,
&s3c_device_lcd,
&s3c_device_wdt,
&s3c_device_i2c0,
&s3c_device_iis,
&s3c_device_usbgadget, /*USB gadget device设备登记*/
};
/*add to use usb*/
#include <plat/pll.h>
#include <mach/regs-clock.h>
#include <asm/delay.h>
static void gt2440_udc_pullup(enum s3c2410_udc_cmd_e cmd)
{
u8 *s3c2410_pullup_info[] = {
" ",
"Pull-up enable",
"Pull-up disable",
"UDC reset, in case of"
};
s3c2410_gpio_cfgpin(S3C2410_GPG12,S3C2410_GPIO_OUTPUT);
printk("smdk2410_udc: %s/n",s3c2410_pullup_info[cmd]);
switch (cmd)
{
case S3C2410_UDC_P_ENABLE :
s3c2410_gpio_setpin(S3C2410_GPG12, 1); //set gpg12 output HIGH
break;
case S3C2410_UDC_P_DISABLE :
s3c2410_gpio_setpin(S3C2410_GPG12, 0); //set gpg12 output LOW
break;
case S3C2410_UDC_P_RESET :
//FIXME!!!
break;
default:
break;
}
}
static struct s3c2410_udc_mach_info gt2440_udc_cfg __initdata = {
.udc_command = gt2440_udc_pullup,
};
static void __init smdk2440_map_io(void)
{
s3c24xx_init_io(smdk2440_iodesc, ARRAY_SIZE(smdk2440_iodesc));
/*add*/
//s3c24xx_init_clocks(16934400);
s3c24xx_init_clocks(12000000);
s3c24xx_init_uarts(smdk2440_uartcfgs, ARRAY_SIZE(smdk2440_uartcfgs));
}
就可以了，下面在windows下就能检测
将内核模块g_serial.ko或者g_ether.ko放到文件系统里，开启后加载
insmod g_serial.ko
echo hello > /dev/ttyGS0
或者
insmod g_ether.ko