在ARM开发板上实现LCD+USB键盘
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一、LCD驱动
这个地方先留着
二、USB键盘驱动
在linux内核里边提供了usbkbd.c可以直接借助这个模块,编译生成驱动模块加载进内核,其实对于驱动程序,这里还不是重点,最后想要实现的是直接在开发板上的LCD屏上实现一个显示终端,然后直接在USB键盘输入指令。
其实我觉得可能不需要搞的这么复杂,本身在PC上进行串口控制的时候,打印的那些,或者是通过串口控制的就是我想要实现的功能,只不过想把这个屏改成LCD或者同时。可能需要改内核吧????
/* * Copyright 2002 Red Hat Inc., Durham, North Carolina. * * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation on the rights to use, copy, modify, merge, * publish, distribute, sublicense, and/or sell copies of the Software, * and to permit persons to whom the Software is furnished to do so, * subject to the following conditions: * * The above copyright notice and this permission notice (including the * next paragraph) shall be included in all copies or substantial * portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NON-INFRINGEMENT. IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * * This is a simple test program that reads from /dev/input/event*, * decoding events into a human readable form. *//* * Authors: * Rickard E. (Rik) Faith <faith@redhat.com> * */#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <string.h>#include <sys/types.h>#include <fcntl.h>#include <errno.h>#include <time.h>#include <linux/input.h>struct input_event event;int main(int argc, char **argv){ char name[64]; /* RATS: Use ok, but could be better */ char buf[256] = { 0, }; /* RATS: Use ok */ unsigned char mask[EV_MAX/8 + 1]; /* RATS: Use ok */ int version; int fd = 0; int rc; int i, j; char *tmp;#define test_bit(bit) (mask[(bit)/8] & (1 << ((bit)%8))) for (i = 0; i < 32; i++) { sprintf(name, "/dev/event%d", i); if ((fd = open(name, O_RDONLY, 0)) >= 0) { ioctl(fd, EVIOCGVERSION, &version); ioctl(fd, EVIOCGNAME(sizeof(buf)), buf); ioctl(fd, EVIOCGBIT(0, sizeof(mask)), mask); printf("%s\n", name); printf(" evdev version: %d.%d.%d\n", version >> 16, (version >> 8) & 0xff, version & 0xff); printf(" name: %s\n", buf); printf(" features:"); for (j = 0; j < EV_MAX; j++) { if (test_bit(j)) { const char *type = "unknown"; switch(j) { case EV_KEY: type = "keys/buttons"; break; case EV_REL: type = "relative"; break; case EV_ABS: type = "absolute"; break; case EV_MSC: type = "reserved"; break; case EV_LED: type = "leds"; break; case EV_SND: type = "sound"; break; case EV_REP: type = "repeat"; break; case EV_FF: type = "feedback"; break; } printf(" %s", type); } } printf("\n"); close(fd); } } if (argc > 1) { sprintf(name, "/dev/event%d", atoi(argv[1])); if ((fd = open(name, O_RDWR, 0)) >= 0) { printf("%s: open, fd = %d\n", name, fd); for (i = 0; i < LED_MAX; i++) { event.time.tv_sec = time(0); event.time.tv_usec = 0; event.type = EV_LED; event.code = i; event.value = 0; write(fd, &event, sizeof(event)); } while ((rc = read(fd, &event, sizeof(event))) > 0) { printf("%-24.24s.%06lu type 0x%04x; code 0x%04x;" " value 0x%08x; ", ctime(&event.time.tv_sec), event.time.tv_usec, event.type, event.code, event.value); switch (event.type) { case EV_KEY: if (event.code > BTN_MISC) { printf("Button %d %s", event.code & 0xff, event.value ? "press" : "release"); } else { printf("Key %d (0x%x) %s", event.code & 0xff, event.code & 0xff, event.value ? "press" : "release"); } break; case EV_REL: switch (event.code) { case REL_X: tmp = "X"; break; case REL_Y: tmp = "Y"; break; case REL_HWHEEL: tmp = "HWHEEL"; break; case REL_DIAL: tmp = "DIAL"; break; case REL_WHEEL: tmp = "WHEEL"; break; case REL_MISC: tmp = "MISC"; break; default: tmp = "UNKNOWN"; break; } printf("Relative %s %d", tmp, event.value); break; case EV_ABS: switch (event.code) { case ABS_X: tmp = "X"; break; case ABS_Y: tmp = "Y"; break; case ABS_Z: tmp = "Z"; break; case ABS_RX: tmp = "RX"; break; case ABS_RY: tmp = "RY"; break; case ABS_RZ: tmp = "RZ"; break; case ABS_THROTTLE: tmp = "THROTTLE"; break; case ABS_RUDDER: tmp = "RUDDER"; break; case ABS_WHEEL: tmp = "WHEEL"; break; case ABS_GAS: tmp = "GAS"; break; case ABS_BRAKE: tmp = "BRAKE"; break; case ABS_HAT0X: tmp = "HAT0X"; break; case ABS_HAT0Y: tmp = "HAT0Y"; break; case ABS_HAT1X: tmp = "HAT1X"; break; case ABS_HAT1Y: tmp = "HAT1Y"; break; case ABS_HAT2X: tmp = "HAT2X"; break; case ABS_HAT2Y: tmp = "HAT2Y"; break; case ABS_HAT3X: tmp = "HAT3X"; break; case ABS_HAT3Y: tmp = "HAT3Y"; break; case ABS_PRESSURE: tmp = "PRESSURE"; break; case ABS_DISTANCE: tmp = "DISTANCE"; break; case ABS_TILT_X: tmp = "TILT_X"; break; case ABS_TILT_Y: tmp = "TILT_Y"; break; case ABS_MISC: tmp = "MISC"; break; default: tmp = "UNKNOWN"; break; } printf("Absolute %s %d", tmp, event.value); break; case EV_MSC: printf("Misc"); break; case EV_LED: printf("Led"); break; case EV_SND: printf("Snd"); break; case EV_REP: printf("Rep"); break; case EV_FF: printf("FF"); break; break; } printf("\n"); } printf("rc = %d, (%s)\n", rc, strerror(errno)); close(fd); } } return 0;}这是在内核里边找到的一个关于usbkbd驱动的测试程序,运行后,按键打印出:
////按1Thu Jan 1 00:17:51 1970.825874 type 0x0001; code 0x0002; value 0x00000001; Key 2 (0x2) pressThu Jan 1 00:17:51 1970.825897 type 0x0000; code 0x0000; value 0x00000000; Thu Jan 1 00:17:51 1970.961856 type 0x0001; code 0x0002; value 0x00000000; Key 2 (0x2) releaseThu Jan 1 00:17:51 1970.961874 type 0x0000; code 0x0000; value 0x00000000; ////按2Thu Jan 1 00:17:53 1970.217894 type 0x0001; code 0x0003; value 0x00000001; Key 3 (0x3) pressThu Jan 1 00:17:53 1970.217917 type 0x0000; code 0x0000; value 0x00000000; Thu Jan 1 00:17:53 1970.361883 type 0x0001; code 0x0003; value 0x00000000; Key 3 (0x3) releaseThu Jan 1 00:17:53 1970.361902 type 0x0000; code 0x0000; value 0x00000000; ////按3Thu Jan 1 00:17:54 1970.649916 type 0x0001; code 0x0004; value 0x00000001; Key 4 (0x4) pressThu Jan 1 00:17:54 1970.649938 type 0x0000; code 0x0000; value 0x00000000; Thu Jan 1 00:17:54 1970.785891 type 0x0001; code 0x0004; value 0x00000000; Key 4 (0x4) releaseThu Jan 1 00:17:54 1970.785911 type 0x0000; code 0x0000; value 0x00000000;
今天在一人的博客http://blog.csdn.net/xingfeng2010/article/details/7006882上看见了,的确可以直接通过设置内核配置,实现ARM开发板+LCD+键盘,一个完整的系统
本来还打算自己写一个应用程序,模拟一下,开来是不用了,参考了一下上面博客,但是内核版本不一样,我大概设置如下:
1———选中Graphics support-->support for frame buffer devices
2———在Graphics support-->support for frame buffer devices-->console display driver support-->
select compiled-in fonts 选择合适的字体。
2———在Graphics support-->support for frame buffer devices-->console display driver support-->
select compiled-in fonts 选择合适的字体。
然后需要设置一下bootloader传给内核的参数:
set bootargs noinitrd console=tty0,115200 root=/dev/mtdblock3 ip=192.168.7.17 rootfstype=jffs2
这个tty0比较特殊,它将lcd的fb0作为stdout,同时将keyboard作为stdin,这两个得同时满足,尝试过将console=tty1,115200,但是只能将信息显示到lcd,并不能将keyboard作为stdin。
得研究研究tty*,似乎每个的stdin和stdout不一样。
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