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解析扫描码
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解析扫描码很复杂,我们也不打算分多节来探讨这个问题...(所以就会一节完成)
一,第一阶段——基本按键处理
第一阶段就是平常的通过扫描码在字符数组中找字符并输出,没有考虑shift、ctrl、alt 0xE0、0xE1 等情况!我们上节课搭建的处理扫描码的框架是 keyboard_handler 只负责取扫描码,如何处理是交给 tty_task 的,因此我们来修改 keyboard_read 函数:
·keyboard.c 节选
PUBLIC void keyboard_read()
{t_8 scan_code;char output[2];t_bool make; /* TRUE : make *//* FALSE: break */memset(output, 0, 2);if(kb_in.count > 0){disable_int();scan_code = *(kb_in.p_tail);kb_in.p_tail++;if (kb_in.p_tail == kb_in.buf + KB_IN_BYTES) {kb_in.p_tail = kb_in.buf;}kb_in.count--;enable_int();/* 下面开始解析扫描码 */if (scan_code == 0xE1) {/* 暂时不做任何操作 */}else if (scan_code == 0xE0) {/* 暂时不做任何操作 */}else { /* 下面处理可打印字符 *//* 首先判断Make Code 还是 Break Code */make = (scan_code & FLAG_BREAK ? FALSE : TRUE);/* 如果是Make Code 就打印,是 Break Code 则不做处理 */if(make){output[0] = keymap[(scan_code & 0x7F) * MAP_COLS];disp_str(output);}}}
}
运行:
如图所示,打印出了 jack zheng 11.30 !(因为我是 11.30 号写完的,简单吧...)
二,第二阶段——全部按键的处理
// ----------------------------
// <keyboard.h>
// Jack Zheng 11.30
// ----------------------------
#ifndef _TINIX_KEYBOARD_H_
#define _TINIX_KEYBOARD_H_#define KB_IN_BYTES 32 /* size of keyboard input buffer */
#define MAP_COLS 3 /* Number of columns in keymap */
#define NR_SCAN_CODES 0x80 /* Number of scan codes (rows in keymap) *//* Flags */
#define FLAG_BREAK 0x0080 /* Break Code */
#define FLAG_EXT 0x0100 /* Normal function keys */
#define FLAG_SHIFT_L 0x0200 /* Shift key */
#define FLAG_SHIFT_R 0x0400 /* Shift key */
#define FLAG_CTRL_L 0x0800 /* Control key */
#define FLAG_CTRL_R 0x1000 /* Control key */
#define FLAG_ALT_L 0x2000 /* Alternate key */
#define FLAG_ALT_R 0x4000 /* Alternate key */
#define FLAG_PAD 0x8000 /* keys in num pad */#define MASK_RAW 0x01FF// ----------------------------
// 功能键产生的字符值
// ----------------------------
/* Special keys */
#define ESC (0x01 + FLAG_EXT) /* Esc */
#define TAB (0x02 + FLAG_EXT) /* Tab */
#define ENTER (0x03 + FLAG_EXT) /* Enter */
#define BACKSPACE (0x04 + FLAG_EXT) /* BackSpace */
#define GUI_L (0x05 + FLAG_EXT) /* L GUI */
#define GUI_R (0x06 + FLAG_EXT) /* R GUI */
#define APPS (0x07 + FLAG_EXT) /* APPS */
/* Shift, Ctrl, Alt */
#define SHIFT_L (0x08 + FLAG_EXT) /* L Shift */
#define SHIFT_R (0x09 + FLAG_EXT) /* R Shift */
#define CTRL_L (0x0A + FLAG_EXT) /* L Ctrl */
#define CTRL_R (0x0B + FLAG_EXT) /* R Ctrl */
#define ALT_L (0x0C + FLAG_EXT) /* L Alt */
#define ALT_R (0x0D + FLAG_EXT) /* R Alt */
/* Lock keys */
#define CAPS_LOCK (0x0E + FLAG_EXT) /* Caps Lock */
#define NUM_LOCK (0x0F + FLAG_EXT) /* Number Lock */
#define SCROLL_LOCK (0x10 + FLAG_EXT) /* Scroll Lock */
/* Function keys */
#define F1 (0x11 + FLAG_EXT) /* F1 */
#define F2 (0x12 + FLAG_EXT) /* F2 */
#define F3 (0x13 + FLAG_EXT) /* F3 */
#define F4 (0x14 + FLAG_EXT) /* F4 */
#define F5 (0x15 + FLAG_EXT) /* F5 */
#define F6 (0x16 + FLAG_EXT) /* F6 */
#define F7 (0x17 + FLAG_EXT) /* F7 */
#define F8 (0x18 + FLAG_EXT) /* F8 */
#define F9 (0x19 + FLAG_EXT) /* F9 */
#define F10 (0x1A + FLAG_EXT) /* F10 */
#define F11 (0x1B + FLAG_EXT) /* F11 */
#define F12 (0x1C + FLAG_EXT) /* F12 */
/* Control Pad */
#define PRINTSCREEN (0x1D + FLAG_EXT) /* Print Screen */
#define PAUSEBREAK (0x1E + FLAG_EXT) /* Pause/Break */
#define INSERT (0x1F + FLAG_EXT) /* Insert */
#define DELETE (0x20 + FLAG_EXT) /* Delete */
#define HOME (0x21 + FLAG_EXT) /* Home */
#define END (0x22 + FLAG_EXT) /* End */
#define PAGEUP (0x23 + FLAG_EXT) /* Page Up */
#define PAGEDOWN (0x24 + FLAG_EXT) /* Page Down */
#define UP (0x25 + FLAG_EXT) /* Up */
#define DOWN (0x26 + FLAG_EXT) /* Down */
#define LEFT (0x27 + FLAG_EXT) /* Left */
#define RIGHT (0x28 + FLAG_EXT) /* Right */
/* ACPI keys */
#define POWER (0x29 + FLAG_EXT) /* Power */
#define SLEEP (0x2A + FLAG_EXT) /* Sleep */
#define WAKE (0x2B + FLAG_EXT) /* Wake Up */
/* Num Pad */
#define PAD_SLASH (0x2C + FLAG_EXT) /* / */
#define PAD_STAR (0x2D + FLAG_EXT) /* * */
#define PAD_MINUS (0x2E + FLAG_EXT) /* - */
#define PAD_PLUS (0x2F + FLAG_EXT) /* + */
#define PAD_ENTER (0x30 + FLAG_EXT) /* Enter */
#define PAD_DOT (0x31 + FLAG_EXT) /* . */
#define PAD_0 (0x32 + FLAG_EXT) /* 0 */
#define PAD_1 (0x33 + FLAG_EXT) /* 1 */
#define PAD_2 (0x34 + FLAG_EXT) /* 2 */
#define PAD_3 (0x35 + FLAG_EXT) /* 3 */
#define PAD_4 (0x36 + FLAG_EXT) /* 4 */
#define PAD_5 (0x37 + FLAG_EXT) /* 5 */
#define PAD_6 (0x38 + FLAG_EXT) /* 6 */
#define PAD_7 (0x39 + FLAG_EXT) /* 7 */
#define PAD_8 (0x3A + FLAG_EXT) /* 8 */
#define PAD_9 (0x3B + FLAG_EXT) /* 9 */
#define PAD_UP PAD_8 /* Up */
#define PAD_DOWN PAD_2 /* Down */
#define PAD_LEFT PAD_4 /* Left */
#define PAD_RIGHT PAD_6 /* Right */
#define PAD_HOME PAD_7 /* Home */
#define PAD_END PAD_1 /* End */
#define PAD_PAGEUP PAD_9 /* Page Up */
#define PAD_PAGEDOWN PAD_3 /* Page Down */
#define PAD_INS PAD_0 /* Ins */
#define PAD_MID PAD_5 /* Middle key */
#define PAD_DEL PAD_DOT /* Del */
// ----------------------------typedef struct s_kb {char* p_head; /* 指向缓冲区中下一个空闲位置 */char* p_tail; /* 指向键盘任务应处理的字节 */int count; /* 缓冲区中共有多少字节 */char buf[KB_IN_BYTES]; /* 缓冲区 */
}KB_INPUT;#endif /* _TINIX_KEYBOARD_H_ */
// ----------------------------
// <keymap.h>
// Jack Zheng 11.30
// ----------------------------
#ifndef _TINIX_KEYMAP_H_
#define _TINIX_KEYMAP_H_/* Keymap for US MF-2 keyboard. */
t_32 keymap[NR_SCAN_CODES * MAP_COLS] = {
/* [scan-code] [!Shift] [Shift] [E0XX]*/
/* 0x00 - none */ 0, 0, 0,
/* 0x01 - ESC */ ESC, ESC, 0,
/* 0x02 - '1' */ '1', '!', 0,
/* 0x03 - '2' */ '2', '@', 0,
/* 0x04 - '3' */ '3', '#', 0,
/* 0x05 - '4' */ '4', '$', 0,
/* 0x06 - '5' */ '5', '%', 0,
/* 0x07 - '6' */ '6', '^', 0,
/* 0x08 - '7' */ '7', '&', 0,
/* 0x09 - '8' */ '8', '*', 0,
/* 0x0A - '9' */ '9', '(', 0,
/* 0x0B - '0' */ '0', ')', 0,
/* 0x0C - '-' */ '-', '_', 0,
/* 0x0D - '=' */ '=', '+', 0,
/* 0x0E - BS */ BACKSPACE, BACKSPACE, 0,
/* 0x0F - TAB */ TAB, TAB, 0,
/* 0x10 - 'q' */ 'q', 'Q', 0,
/* 0x11 - 'w' */ 'w', 'W', 0,
/* 0x12 - 'e' */ 'e', 'E', 0,
/* 0x13 - 'r' */ 'r', 'R', 0,
/* 0x14 - 't' */ 't', 'T', 0,
/* 0x15 - 'y' */ 'y', 'Y', 0,
/* 0x16 - 'u' */ 'u', 'U', 0,
/* 0x17 - 'i' */ 'i', 'I', 0,
/* 0x18 - 'o' */ 'o', 'O', 0,
/* 0x19 - 'p' */ 'p', 'P', 0,
/* 0x1A - '[' */ '[', '{', 0,
/* 0x1B - ']' */ ']', '}', 0,
/* 0x1C - CR/LF */ ENTER, ENTER, PAD_ENTER,
/* 0x1D - l. Ctrl */ CTRL_L, CTRL_L, CTRL_R,
/* 0x1E - 'a' */ 'a', 'A', 0,
/* 0x1F - 's' */ 's', 'S', 0,
/* 0x20 - 'd' */ 'd', 'D', 0,
/* 0x21 - 'f' */ 'f', 'F', 0,
/* 0x22 - 'g' */ 'g', 'G', 0,
/* 0x23 - 'h' */ 'h', 'H', 0,
/* 0x24 - 'j' */ 'j', 'J', 0,
/* 0x25 - 'k' */ 'k', 'K', 0,
/* 0x26 - 'l' */ 'l', 'L', 0,
/* 0x27 - ';' */ ';', ':', 0,
/* 0x28 - '\'' */ '\'', '"', 0,
/* 0x29 - '`' */ '`', '~', 0,
/* 0x2A - l. SHIFT */ SHIFT_L, SHIFT_L, 0,
/* 0x2B - '\' */ '\\', '|', 0,
/* 0x2C - 'z' */ 'z', 'Z', 0,
/* 0x2D - 'x' */ 'x', 'X', 0,
/* 0x2E - 'c' */ 'c', 'C', 0,
/* 0x2F - 'v' */ 'v', 'V', 0,
/* 0x30 - 'b' */ 'b', 'B', 0,
/* 0x31 - 'n' */ 'n', 'N', 0,
/* 0x32 - 'm' */ 'm', 'M', 0,
/* 0x33 - ',' */ ',', '<', 0,
/* 0x34 - '.' */ '.', '>', 0,
/* 0x35 - '/' */ '/', '?', PAD_SLASH,
/* 0x36 - r. SHIFT */ SHIFT_R, SHIFT_R, 0,
/* 0x37 - '*' */ '*', '*', 0,
/* 0x38 - ALT */ ALT_L, ALT_L, ALT_R,
/* 0x39 - ' ' */ ' ', ' ', 0,
/* 0x3A - CapsLock */ CAPS_LOCK, CAPS_LOCK, 0,
/* 0x3B - F1 */ F1, F1, 0,
/* 0x3C - F2 */ F2, F2, 0,
/* 0x3D - F3 */ F3, F3, 0,
/* 0x3E - F4 */ F4, F4, 0,
/* 0x3F - F5 */ F5, F5, 0,
/* 0x40 - F6 */ F6, F6, 0,
/* 0x41 - F7 */ F7, F7, 0,
/* 0x42 - F8 */ F8, F8, 0,
/* 0x43 - F9 */ F9, F9, 0,
/* 0x44 - F10 */ F10, F10, 0,
/* 0x45 - NumLock */ NUM_LOCK, NUM_LOCK, 0,
/* 0x46 - ScrLock */ SCROLL_LOCK, SCROLL_LOCK, 0,
/* 0x47 - Home */ PAD_HOME, '7', HOME,
/* 0x48 - CurUp */ PAD_UP, '8', UP,
/* 0x49 - PgUp */ PAD_PAGEUP, '9', PAGEUP,
/* 0x4A - '-' */ PAD_MINUS, '-', 0,
/* 0x4B - Left */ PAD_LEFT, '4', LEFT,
/* 0x4C - MID */ PAD_MID, '5', 0,
/* 0x4D - Right */ PAD_RIGHT, '6', RIGHT,
/* 0x4E - '+' */ PAD_PLUS, '+', 0,
/* 0x4F - End */ PAD_END, '1', END,
/* 0x50 - Down */ PAD_DOWN, '2', DOWN,
/* 0x51 - PgDown */ PAD_PAGEDOWN, '3', PAGEDOWN,
/* 0x52 - Insert */ PAD_INS, '0', INSERT,
/* 0x53 - Delete */ PAD_DOT, '.', DELETE,
/* 0x54 - Enter */ 0, 0, 0,
/* 0x55 - ??? */ 0, 0, 0,
/* 0x56 - ??? */ 0, 0, 0,
/* 0x57 - F11 */ F11, F11, 0,
/* 0x58 - F12 */ F12, F12, 0,
/* 0x59 - ??? */ 0, 0, 0,
/* 0x5A - ??? */ 0, 0, 0,
/* 0x5B - ??? */ 0, 0, GUI_L,
/* 0x5C - ??? */ 0, 0, GUI_R,
/* 0x5D - ??? */ 0, 0, APPS,
/* 0x5E - ??? */ 0, 0, 0,
/* 0x5F - ??? */ 0, 0, 0,
/* 0x60 - ??? */ 0, 0, 0,
/* 0x61 - ??? */ 0, 0, 0,
/* 0x62 - ??? */ 0, 0, 0,
/* 0x63 - ??? */ 0, 0, 0,
/* 0x64 - ??? */ 0, 0, 0,
/* 0x65 - ??? */ 0, 0, 0,
/* 0x66 - ??? */ 0, 0, 0,
/* 0x67 - ??? */ 0, 0, 0,
/* 0x68 - ??? */ 0, 0, 0,
/* 0x69 - ??? */ 0, 0, 0,
/* 0x6A - ??? */ 0, 0, 0,
/* 0x6B - ??? */ 0, 0, 0,
/* 0x6C - ??? */ 0, 0, 0,
/* 0x6D - ??? */ 0, 0, 0,
/* 0x6E - ??? */ 0, 0, 0,
/* 0x6F - ??? */ 0, 0, 0,
/* 0x70 - ??? */ 0, 0, 0,
/* 0x71 - ??? */ 0, 0, 0,
/* 0x72 - ??? */ 0, 0, 0,
/* 0x73 - ??? */ 0, 0, 0,
/* 0x74 - ??? */ 0, 0, 0,
/* 0x75 - ??? */ 0, 0, 0,
/* 0x76 - ??? */ 0, 0, 0,
/* 0x77 - ??? */ 0, 0, 0,
/* 0x78 - ??? */ 0, 0, 0,
/* 0x78 - ??? */ 0, 0, 0,
/* 0x7A - ??? */ 0, 0, 0,
/* 0x7B - ??? */ 0, 0, 0,
/* 0x7C - ??? */ 0, 0, 0,
/* 0x7D - ??? */ 0, 0, 0,
/* 0x7E - ??? */ 0, 0, 0,
/* 0x7F - ??? */ 0, 0, 0
};
#endif /* _TINIX_KEYMAP_H_ */
需要注意的是,所有的扫描码被解析之后都是数值,只是有些数值可以构成字符打印出来,有些数值不能打印输出,而是被用来做功能键的识别!
// ----------------------------
// <keyboard.c>
// Jack Zheng 11.30
// ----------------------------
#include "type.h"
#include "const.h"
#include "protect.h"
#include "proto.h"
#include "string.h"
#include "proc.h"
#include "global.h"
#include "keyboard.h"
#include "keymap.h"/* 本文件内函数声明 */
PRIVATE t_8 get_byte_from_kb_buf();PRIVATE KB_INPUT kb_in;
PRIVATE t_bool code_with_E0;
PRIVATE t_bool shift_l; /* l shift state */
PRIVATE t_bool shift_r; /* r shift state */
PRIVATE t_bool alt_l; /* l alt state */
PRIVATE t_bool alt_r; /* r left state */
PRIVATE t_bool ctrl_l; /* l ctrl state */
PRIVATE t_bool ctrl_r; /* l ctrl state */
PRIVATE int column = 0; /* keyrow[column] 将是 keymap 中某一个值 */PUBLIC void keyboard_handler(int irq)
{t_8 scan_code = in_byte(KB_DATA);if(kb_in.count < KB_IN_BYTES){*(kb_in.p_head) = scan_code;kb_in.p_head++;if(kb_in.p_head == kb_in.buf + KB_IN_BYTES){kb_in.p_head = kb_in.buf;}kb_in.count++;}
}PUBLIC void init_keyboard()
{kb_in.count = 0;kb_in.p_head = kb_in.p_tail = kb_in.buf;put_irq_handler(KEYBOARD_IRQ, keyboard_handler); /* 设定键盘中断处理程序 */enable_irq(KEYBOARD_IRQ); /* 开键盘中断 */
}PUBLIC void keyboard_read()
{t_8 scan_code;t_bool make; /* TRUE : make *//* FALSE: break */t_32 key = 0;/* 用一个整型来表示一个键。 *//* 比如,如果 Home 被按下,则 key 值将为定义在 keyboard.h 中的 'HOME'。*/t_32* keyrow; /* 指向 keymap[] 的某一行 */if(kb_in.count > 0){code_with_E0 = FALSE;scan_code = get_byte_from_kb_buf();/* 下面开始解析扫描码 */if (scan_code == 0xE1) {int i;t_8 pausebreak_scan_code[] = {0xE1, 0x1D, 0x45, 0xE1, 0x9D, 0xC5};t_bool is_pausebreak = TRUE;for(i=1;i<6;i++){if (get_byte_from_kb_buf() != pausebreak_scan_code[i]) {is_pausebreak = FALSE;break;}}if (is_pausebreak) {key = PAUSEBREAK;}}else if (scan_code == 0xE0) {scan_code = get_byte_from_kb_buf();/* PrintScreen 被按下 */if (scan_code == 0x2A) {if (get_byte_from_kb_buf() == 0xE0) {if (get_byte_from_kb_buf() == 0x37) {key = PRINTSCREEN;make = TRUE;}}}/* PrintScreen 被释放 */if (scan_code == 0xB7) {if (get_byte_from_kb_buf() == 0xE0) {if (get_byte_from_kb_buf() == 0xAA) {key = PRINTSCREEN;make = FALSE;}}}/* 不是 PrintScreen。此时 scan_code 为 0xE0 紧跟的那个值。 */if (key == 0) {code_with_E0 = TRUE;}}if ((key != PAUSEBREAK) && (key != PRINTSCREEN)) {/* 首先判断Make Code 还是 Break Code */make = (scan_code & FLAG_BREAK ? FALSE : TRUE);/* 先定位到 keymap 中的行 */keyrow = &keymap[(scan_code & 0x7F) * MAP_COLS];column = 0;if (shift_l || shift_r) {column = 1;}if (code_with_E0) {column = 2;}key = keyrow[column];switch(key) {case SHIFT_L:shift_l = make;break;case SHIFT_R:shift_r = make;break;case CTRL_L:ctrl_l = make;break;case CTRL_R:ctrl_r = make;break;case ALT_L:alt_l = make;break;case ALT_R:alt_l = make;break;default:break;}}if(make){ /* 忽略 Break Code */key |= shift_l ? FLAG_SHIFT_L : 0;key |= shift_r ? FLAG_SHIFT_R : 0;key |= ctrl_l ? FLAG_CTRL_L : 0;key |= ctrl_r ? FLAG_CTRL_R : 0;key |= alt_l ? FLAG_ALT_L : 0;key |= alt_r ? FLAG_ALT_R : 0;in_process(key);}}
}PRIVATE t_8 get_byte_from_kb_buf() /* 从键盘缓冲区中读取下一个字节 */
{t_8 scan_code;while (kb_in.count <= 0) {} /* 等待下一个字节到来 */disable_int();scan_code = *(kb_in.p_tail);kb_in.p_tail++;if (kb_in.p_tail == kb_in.buf + KB_IN_BYTES) {kb_in.p_tail = kb_in.buf;}kb_in.count--;enable_int();return scan_code;
}
// ----------------------------
// <tty.c>
// Jack Zheng 11.30
// ----------------------------
#include "type.h"
#include "const.h"
#include "protect.h"
#include "proto.h"
#include "string.h"
#include "proc.h"
#include "global.h"
#include "keyboard.h"PUBLIC void task_tty()
{while(1){keyboard_read();}
}PUBLIC void in_process(t_32 key)
{char output[2] = {'\0', '\0'};if (!(key & FLAG_EXT)) {output[0] = key & 0xFF;disp_str(output);}
}
运行:
OK,我们能在 in_process 函数中捕获所有的不管是字符按键还是功能按键,对这些按键采取什么操作,可以由我们任意发挥!