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Code Issues Releases Wiki Activity

🆕 用户态解析键盘扫描码

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fslongjin
2022-05-21 21:49:56 +08:00
parent b9c4efcb0f
commit e6108602df
13 changed files with 626 additions and 439 deletions
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user/libs/libKeyboard/keyboard.c Normal file
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#include "keyboard.h"
#include <libc/unistd.h>
// 功能键标志变量
static bool shift_l = 0, shift_r = 0, ctrl_l = 0, ctrl_r = 0, alt_l = 0, alt_r = 0;
static bool gui_l = 0, gui_r = 0, apps = 0, insert = 0, home = 0, pgup = 0, del = 0, end = 0, pgdn = 0, arrow_u = 0, arrow_l = 0, arrow_d = 0, arrow_r = 0;
static bool kp_forward_slash = 0, kp_en = 0;
// 键盘扫描码有三种：
// 0xE1开头的PauseBreak键
// 0xE0开头的功能键
// 1byte的普通按键
// pause break键的扫描码，没错，它就是这么长
unsigned char pause_break_scan_code[] = {0xe1, 0x1d, 0x45, 0xe1, 0x9d, 0xc5};
// 第一套键盘扫描码 及其对应的字符
uint32_t keycode_map_normal[NUM_SCAN_CODES * MAP_COLS] =
{
/*scan-code unShift Shift */
/*--------------------------------------------------------------*/
/*0x00*/ 0,
0,
/*0x01*/ 0,
0, // ESC
/*0x02*/ '1',
'!',
/*0x03*/ '2',
'@',
/*0x04*/ '3',
'#',
/*0x05*/ '4',
'$',
/*0x06*/ '5',
'%',
/*0x07*/ '6',
'^',
/*0x08*/ '7',
'&',
/*0x09*/ '8',
'*',
/*0x0a*/ '9',
'(',
/*0x0b*/ '0',
')',
/*0x0c*/ '-',
'_',
/*0x0d*/ '=',
'+',
/*0x0e*/ '\b',
'\b', // BACKSPACE
/*0x0f*/ '\t',
'\t', // TAB
/*0x10*/ 'q',
'Q',
/*0x11*/ 'w',
'W',
/*0x12*/ 'e',
'E',
/*0x13*/ 'r',
'R',
/*0x14*/ 't',
'T',
/*0x15*/ 'y',
'Y',
/*0x16*/ 'u',
'U',
/*0x17*/ 'i',
'I',
/*0x18*/ 'o',
'O',
/*0x19*/ 'p',
'P',
/*0x1a*/ '[',
'{',
/*0x1b*/ ']',
'}',
/*0x1c*/ '\n',
'\n', // ENTER
/*0x1d*/ 0x1d,
0x1d, // CTRL Left
/*0x1e*/ 'a',
'A',
/*0x1f*/ 's',
'S',
/*0x20*/ 'd',
'D',
/*0x21*/ 'f',
'F',
/*0x22*/ 'g',
'G',
/*0x23*/ 'h',
'H',
/*0x24*/ 'j',
'J',
/*0x25*/ 'k',
'K',
/*0x26*/ 'l',
'L',
/*0x27*/ ';',
':',
/*0x28*/ '\'',
'"',
/*0x29*/ '`',
'~',
/*0x2a*/ 0x2a,
0x2a, // SHIFT Left
/*0x2b*/ '\\',
'|',
/*0x2c*/ 'z',
'Z',
/*0x2d*/ 'x',
'X',
/*0x2e*/ 'c',
'C',
/*0x2f*/ 'v',
'V',
/*0x30*/ 'b',
'B',
/*0x31*/ 'n',
'N',
/*0x32*/ 'm',
'M',
/*0x33*/ ',',
'<',
/*0x34*/ '.',
'>',
/*0x35*/ '/',
'?',
/*0x36*/ 0x36,
0x36, // SHIFT Right
/*0x37*/ '*',
'*',
/*0x38*/ 0x38,
0x38, // ALT Left
/*0x39*/ ' ',
' ',
/*0x3a*/ 0,
0, // CAPS LOCK
/*0x3b*/ 0,
0, // F1
/*0x3c*/ 0,
0, // F2
/*0x3d*/ 0,
0, // F3
/*0x3e*/ 0,
0, // F4
/*0x3f*/ 0,
0, // F5
/*0x40*/ 0,
0, // F6
/*0x41*/ 0,
0, // F7
/*0x42*/ 0,
0, // F8
/*0x43*/ 0,
0, // F9
/*0x44*/ 0,
0, // F10
/*0x45*/ 0,
0, // NUM LOCK
/*0x46*/ 0,
0, // SCROLL LOCK
/*0x47*/ '7',
0, /*PAD HONE*/
/*0x48*/ '8',
0, /*PAD UP*/
/*0x49*/ '9',
0, /*PAD PAGEUP*/
/*0x4a*/ '-',
0, /*PAD MINUS*/
/*0x4b*/ '4',
0, /*PAD LEFT*/
/*0x4c*/ '5',
0, /*PAD MID*/
/*0x4d*/ '6',
0, /*PAD RIGHT*/
/*0x4e*/ '+',
0, /*PAD PLUS*/
/*0x4f*/ '1',
0, /*PAD END*/
/*0x50*/ '2',
0, /*PAD DOWN*/
/*0x51*/ '3',
0, /*PAD PAGEDOWN*/
/*0x52*/ '0',
0, /*PAD INS*/
/*0x53*/ '.',
0, /*PAD DOT*/
/*0x54*/ 0,
0,
/*0x55*/ 0,
0,
/*0x56*/ 0,
0,
/*0x57*/ 0,
0, // F11
/*0x58*/ 0,
0, // F12
/*0x59*/ 0,
0,
/*0x5a*/ 0,
0,
/*0x5b*/ 0,
0,
/*0x5c*/ 0,
0,
/*0x5d*/ 0,
0,
/*0x5e*/ 0,
0,
/*0x5f*/ 0,
0,
/*0x60*/ 0,
0,
/*0x61*/ 0,
0,
/*0x62*/ 0,
0,
/*0x63*/ 0,
0,
/*0x64*/ 0,
0,
/*0x65*/ 0,
0,
/*0x66*/ 0,
0,
/*0x67*/ 0,
0,
/*0x68*/ 0,
0,
/*0x69*/ 0,
0,
/*0x6a*/ 0,
0,
/*0x6b*/ 0,
0,
/*0x6c*/ 0,
0,
/*0x6d*/ 0,
0,
/*0x6e*/ 0,
0,
/*0x6f*/ 0,
0,
/*0x70*/ 0,
0,
/*0x71*/ 0,
0,
/*0x72*/ 0,
0,
/*0x73*/ 0,
0,
/*0x74*/ 0,
0,
/*0x75*/ 0,
0,
/*0x76*/ 0,
0,
/*0x77*/ 0,
0,
/*0x78*/ 0,
0,
/*0x79*/ 0,
0,
/*0x7a*/ 0,
0,
/*0x7b*/ 0,
0,
/*0x7c*/ 0,
0,
/*0x7d*/ 0,
0,
/*0x7e*/ 0,
0,
/*0x7f*/ 0,
0,
};
/**
* @brief 解析键盘扫描码
*
*/
int keyboard_analyze_keycode(int fd)
{
bool flag_make = false;
int c = keyboard_get_scancode(fd);
// 循环队列为空
if (c == -1)
return 0;
unsigned char scancode = (unsigned char)c;
int key = 0;
if (scancode == 0xE1) // Pause Break
{
key = PAUSE_BREAK;
// 清除缓冲区中剩下的扫描码
for (int i = 1; i < 6; ++i)
if (keyboard_get_scancode(fd) != pause_break_scan_code[i])
{
key = 0;
break;
}
}
else if (scancode == 0xE0) // 功能键, 有多个扫描码
{
// 获取下一个扫描码
scancode = keyboard_get_scancode(fd);
switch (scancode)
{
case 0x2a: // print screen 按键被按下
if (keyboard_get_scancode(fd) == 0xe0)
if (keyboard_get_scancode(fd) == 0x37)
{
key = PRINT_SCREEN;
flag_make = true;
}
break;
case 0xb7: // print screen 按键被松开
if (keyboard_get_scancode(fd) == 0xe0)
if (keyboard_get_scancode(fd) == 0xaa)
{
key = PRINT_SCREEN;
flag_make = false;
}
break;
case 0x1d: // 按下右边的ctrl
ctrl_r = true;
key = OTHER_KEY;
break;
case 0x9d: // 松开右边的ctrl
ctrl_r = false;
key = OTHER_KEY;
break;
case 0x38: // 按下右边的alt
alt_r = true;
key = OTHER_KEY;
break;
case 0xb8: // 松开右边的alt
alt_r = false;
key = OTHER_KEY;
break;
case 0x5b:
gui_l = true;
key = OTHER_KEY;
break;
case 0xdb:
gui_l = false;
key = OTHER_KEY;
break;
case 0x5c:
gui_r = true;
key = OTHER_KEY;
break;
case 0xdc:
gui_r = false;
key = OTHER_KEY;
break;
case 0x5d:
apps = true;
key = OTHER_KEY;
break;
case 0xdd:
apps = false;
key = OTHER_KEY;
break;
case 0x52:
insert = true;
key = OTHER_KEY;
break;
case 0xd2:
insert = false;
key = OTHER_KEY;
break;
case 0x47:
home = true;
key = OTHER_KEY;
break;
case 0xc7:
home = false;
key = OTHER_KEY;
break;
case 0x49:
pgup = true;
key = OTHER_KEY;
break;
case 0xc9:
pgup = false;
key = OTHER_KEY;
break;
case 0x53:
del = true;
key = OTHER_KEY;
break;
case 0xd3:
del = false;
key = OTHER_KEY;
break;
case 0x4f:
end = true;
key = OTHER_KEY;
break;
case 0xcf:
end = false;
key = OTHER_KEY;
break;
case 0x51:
pgdn = true;
key = OTHER_KEY;
break;
case 0xd1:
pgdn = false;
key = OTHER_KEY;
break;
case 0x48:
arrow_u = true;
key = OTHER_KEY;
break;
case 0xc8:
arrow_u = false;
key = OTHER_KEY;
break;
case 0x4b:
arrow_l = true;
key = OTHER_KEY;
break;
case 0xcb:
arrow_l = false;
key = OTHER_KEY;
break;
case 0x50:
arrow_d = true;
key = OTHER_KEY;
break;
case 0xd0:
arrow_d = false;
key = OTHER_KEY;
break;
case 0x4d:
arrow_r = true;
key = OTHER_KEY;
break;
case 0xcd:
arrow_r = false;
key = OTHER_KEY;
break;
case 0x35: // 数字小键盘的 / 符号
kp_forward_slash = true;
key = OTHER_KEY;
break;
case 0xb5:
kp_forward_slash = false;
key = OTHER_KEY;
break;
case 0x1c:
kp_en = true;
key = OTHER_KEY;
break;
case 0x9c:
kp_en = false;
key = OTHER_KEY;
break;
default:
key = OTHER_KEY;
break;
}
}
if (key == 0) // 属于第三类扫描码
{
// 判断按键是被按下还是抬起
flag_make = ((scancode & FLAG_BREAK) ? 0 : 1);
// 计算扫描码位于码表的第几行
uint32_t *key_row = &keycode_map_normal[(scancode & 0x7f) * MAP_COLS];
unsigned char col = 0;
// shift被按下
if (shift_l || shift_r)
col = 1;
key = key_row[col];
switch (scancode & 0x7f)
{
case 0x2a:
shift_l = flag_make;
key = 0;
break;
case 0x36:
shift_r = flag_make;
key = 0;
break;
case 0x1d:
ctrl_l = flag_make;
key = 0;
break;
case 0x38:
ctrl_r = flag_make;
key = 0;
break;
default:
if (!flag_make)
key = 0;
break;
}
if (key)
return key;
}
return 0;
}
/**
* @brief 从键盘设备文件中获取键盘扫描码
*
*/
int keyboard_get_scancode(int fd)
{
unsigned int ret = 0;
read(fd, &ret, 1);
return ret;
}