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Code Issues Releases Wiki Activity

🆕 键盘驱动

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This commit is contained in:
fslongjin
2022-03-17 00:00:28 +08:00
parent cc1e126959
commit 1333afd703
5 changed files with 446 additions and 16 deletions
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280
kernel/driver/keyboard/keyboard.c
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@ -5,7 +5,12 @@
#include "../../common/printk.h"
static struct keyboard_input_buffer *kb_buf_ptr = NULL;
static int shift_l, shift_r, ctrl_l, ctrl_r, alt_l, alt_r;
// 功能键标志变量
static bool shift_l, shift_r, ctrl_l, ctrl_r, alt_l, alt_r;
static bool gui_l, gui_r, apps, insert, home, pgup, del, end, pgdn, arrow_u, arrow_l, arrow_d, arrow_r;
static bool kp_forward_slash, kp_en;
struct apic_IO_APIC_RTE_entry entry;
hardware_intr_controller keyboard_intr_controller =
@ -29,10 +34,10 @@ void keyboard_handler(ul irq_num, ul param, struct pt_regs *regs)
{
// 读取键盘输入的信息
unsigned x = io_in8(0x60);
printk_color(ORANGE, BLACK, "key_pressed:%02x\n", x);
// printk_color(ORANGE, BLACK, "key_pressed:%02x\n", x);
// 当头指针越过界时，恢复指向数组头部
if (kb_buf_ptr->ptr_head == kb_buf_ptr + keyboard_buffer_size)
if (kb_buf_ptr->ptr_head == kb_buf_ptr->buffer + keyboard_buffer_size)
kb_buf_ptr->ptr_head = kb_buf_ptr->buffer;
if (kb_buf_ptr->count >= keyboard_buffer_size)
@ -56,8 +61,8 @@ void keyboard_init()
// 申请键盘循环队列缓冲区的内存
kb_buf_ptr = (struct keyboard_input_buffer *)kmalloc(sizeof(struct keyboard_input_buffer), 0);
kb_buf_ptr->ptr_head = kb_buf_ptr;
kb_buf_ptr->ptr_tail = kb_buf_ptr;
kb_buf_ptr->ptr_head = kb_buf_ptr->buffer;
kb_buf_ptr->ptr_tail = kb_buf_ptr->buffer;
kb_buf_ptr->count = 0;
memset(kb_buf_ptr->buffer, 0, keyboard_buffer_size);
@ -89,12 +94,12 @@ void keyboard_init()
for (int i = 0; i < 1000; ++i)
for (int j = 0; j < 1000; ++j)
nop();
shift_l = 0;
shift_r = 0;
ctrl_l = 0;
ctrl_r = 0;
alt_l = 0;
alt_r = 0;
shift_l = false;
shift_r = false;
ctrl_l = false;
ctrl_r = false;
alt_l = false;
alt_r = false;
// 注册中断处理程序
irq_register(0x21, &entry, &keyboard_handler, (ul)kb_buf_ptr, &keyboard_intr_controller, "ps/2 keyboard");
@ -109,3 +114,256 @@ void keyboard_exit()
irq_unregister(0x21);
kfree((ul *)kb_buf_ptr);
}
/**
* @brief 解析键盘扫描码
*
*/
void keyboard_analyze_keycode()
{
bool flag_make = false;
int c = keyboard_get_scancode();
// 循环队列为空
if (c == -1)
return;
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() != 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();
switch (scancode)
{
case 0x2a: // print screen 按键被按下
if (keyboard_get_scancode() == 0xe0)
if (keyboard_get_scancode() == 0x37)
{
key = PRINT_SCREEN;
flag_make = true;
}
break;
case 0xb7: // print screen 按键被松开
if (keyboard_get_scancode() == 0xe0)
if (keyboard_get_scancode() == 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
uint *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)
printk_color(ORANGE, WHITE, "(key:%c)\t", key);
}
}
/**
* @brief 从缓冲队列中获取键盘扫描码
*
*/
int keyboard_get_scancode()
{
// 缓冲队列为空
if (kb_buf_ptr->count == 0)
return -1;
if (kb_buf_ptr->ptr_tail == kb_buf_ptr->buffer + keyboard_buffer_size)
kb_buf_ptr->ptr_tail = kb_buf_ptr->buffer;
int ret = (int)(*(kb_buf_ptr->ptr_tail));
--(kb_buf_ptr->count);
++(kb_buf_ptr->ptr_tail);
return ret;
}