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回想一下之前用windows下的并口助手，接收和发送对底层开发板子的数据流。硬件层面上，下位机通发送数据linux内核中的串口驱动，通过USB转并口linux内核中的串口驱动，实现了USB插口到通用并口的转换；软件层面上，须要并口驱动CH341PL2303，和USB驱动。之后能够通过并口助手(应用程序)来实现与下位机的交互。
在嵌入式系统上，内核是经剪裁过的，须要linux内核对这两种驱动程序的选装或则移植。
USB驱动的移植
添加USB设备树信息
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root@linux:~# cd linux-3.14-fs4412/
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root@linux:linux-3.14-fs4412# vim arch/arm/boot/dts/exynos4412-fs4412.dts
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usbphy: usbphy@125B0000 {
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#address-cells = ;
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#size-cells = ;
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compatible = "samsung,exynos4x12-usb2phy";
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reg = <0x125B0000 0x100>;
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ranges;
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clocks = <&clock 2>, <&clock 305>;
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clock-names = "xusbxti", "otg";
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usbphy-sys {
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reg = <0x10020704 0x8 0x1001021c 0x4>;
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};
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};
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ehci@12580000 {
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status = "okay";
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usbphy = ;
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};
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usb3503@08 {
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compatible = "smsc,usb3503";
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reg = <0x08 0x4>;
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connect-gpios = <&gpm3 3 1>;
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intn-gpios = <&gpx2 3 1>;
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reset-gpios = <&gpm2 4 1>;
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initial-mode = <1>;
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};
编译内核，cp到tftp根目录下
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root@linux:linux-3.14-fs4412# make dtbs
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scripts/kconfig/conf --silentoldconfig Kconfig
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DTC arch/arm/boot/dts/exynos4412-fs4412.dtb
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root@linux:linux-3.14-fs4412# cp arch/arm/boot/dts/exynos4412-fs4412.dtb /tftpboot/
验证
重启启动开发板，将U盘插入USB口，可系统辨识到设备节点
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[root@farsight ]# ls /dev/sda
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/dev/sda
配置内核的并口驱动：CH341PL2303
步入内核源码目录linux视频教程，配置内核
root@linux:linux-3.14-fs4412# make menuconfig
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Symbol: USB_SERIAL_PL2303 [=y]
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Type : tristate
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Prompt: USB Prolific 2303 Single Port Serial Driver
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Location:
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-> Device Drivers
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-> USB support (USB_SUPPORT [=y])
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(1) -> USB Serial Converter support (USB_SERIAL [=y])
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Defined at drivers/usb/serial/Kconfig:510
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Depends on: USB_SUPPORT [=y] && USB [=y] && USB_SERIAL [=y]
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Symbol: USB_SERIAL_CH341 [=y]
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Type : tristate
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Prompt: USB Winchiphead CH341 Single Port Serial Driver
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Location:
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-> Device Drivers
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-> USB support (USB_SUPPORT [=y])
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(1) -> USB Serial Converter support (USB_SERIAL [=y])
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Defined at drivers/usb/serial/Kconfig:99
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Depends on: USB_SUPPORT [=y] && USB [=y] && USB_SERIAL [=y]
root@linux:linux-3.14-fs4412# make uImage
步入目录查看编译的状态
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root@linux:linux-3.14-fs4412# cd drivers/usb/serial/
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root@linux:serial# ls *.o
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built-in.o bus.o ch341.o generic.o pl2303.o usb-serial.o usbserial.o
cp到tftp根目录下
root@linux:linux-3.14-fs4412# cp arch/arm/boot/uImage /tftpboot/
验证
重启启动开发板，将M0的USB并口插入到A9的USB并口上红旗linux安装，查看设备节点信息
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[root@farsight ]# ls /dev/ttyUSB0
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/dev/ttyUSB0
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