/*
* inch.c -- keyboard minimal driver
*
* Copyright (C) 1999 Eric Valette. valette@crf.canon.fr
*
* This code is based on the pc386 BSP inch.c so the following
* copyright also applies :
*
* (C) Copyright 1997 -
* - NavIST Group - Real-Time Distributed Systems and Industrial Automation
*
* http://pandora.ist.utl.pt
*
* Instituto Superior Tecnico * Lisboa * PORTUGAL
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#include <bsp.h>
#include <bsp/bootcard.h>
#ifdef BSP_KBD_IOBASE
#include <bsp/irq.h>
#include "console.inl"
/*-------------------------------------------------------------------------+
| Constants
+--------------------------------------------------------------------------*/
#define KBD_CTL 0x1 /* -------------------------------- */
#define KBD_DATA 0x0 /* Port offsets for PC keyboard controller */
#define KBD_STATUS 0x4 /* -------------------------------- */
#define KBD_BUF_SIZE 256
/*-------------------------------------------------------------------------+
| Global Variables
+--------------------------------------------------------------------------*/
static char key_map[] =
{
0,033,'1','2','3','4','5','6','7','8','9','0','-','=','\b','\t',
'q','w','e','r','t','y','u','i','o','p','[',']',015,0x80,
'a','s','d','f','g','h','j','k','l',';',047,0140,0x80,
0134,'z','x','c','v','b','n','m',',','.','/',0x80,
'*',0x80,' ',0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,
0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,
0x80,0x80,0x80,'0',0177
}; /* Keyboard scancode -> character map with no modifiers. */
static char shift_map[] =
{
0,033,'!','@','#','$','%','^','&','*','(',')','_','+','\b','\t',
'Q','W','E','R','T','Y','U','I','O','P','{','}',015,0x80,
'A','S','D','F','G','H','J','K','L',':',042,'~',0x80,
'|','Z','X','C','V','B','N','M','<','>','?',0x80,
'*',0x80,' ',0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,
0x80,0x80,0x80,0x80,'7','8','9',0x80,'4','5','6',0x80,
'1','2','3','0',177
}; /* Keyboard scancode -> character map with SHIFT key modifier. */
static char kbd_buffer[KBD_BUF_SIZE];
static uint16_t kbd_first = 0;
static uint16_t kbd_last = 0;
static uint16_t kbd_end = KBD_BUF_SIZE - 1;
/*-------------------------------------------------------------------------+
| Function: _IBMPC_scankey
| Description: This function can be called during a poll for input, or by
| an ISR. Basically any time you want to process a keypress.
| Global Variables: key_map, shift_map.
| Arguments: outChar - character read in case of a valid reading,
| otherwise unchanged.
| Returns: true in case a valid character has been read,
| false otherwise.
+--------------------------------------------------------------------------*/
bool
_IBMPC_scankey(char *outChar)
{
unsigned char inChar;
static int alt_pressed = 0;
static int ctrl_pressed = 0;
static int shift_pressed = 0;
static int caps_pressed = 0;
static int extended = 0;
*outChar = 0; /* default value if we return false */
/* Read keyboard controller, toggle enable */
inChar=kbd_inb(KBD_CTL);
kbd_outb(KBD_CTL, inChar & ~0x80);
kbd_outb(KBD_CTL, inChar | 0x80);
kbd_outb(KBD_CTL, inChar & ~0x80);
/* See if it has data */
inChar=kbd_inb(KBD_STATUS);
if ((inChar & 0x01) == 0)
return false;
/* Read the data. Handle nonsense with shift, control, etc. */
inChar=kbd_inb(KBD_DATA);
if (extended)
extended--;
switch (inChar)
{
case 0xe0:
extended = 2;
return false;
break;
case 0x38:
alt_pressed = 1;
return false;
break;
case 0xb8:
alt_pressed = 0;
return false;
break;
case 0x1d:
ctrl_pressed = 1;
return false;
break;
case 0x9d:
ctrl_pressed = 0;
return false;
break;
case 0x2a:
if (extended)
return false;
case 0x36:
shift_pressed = 1;
return false;
break;
case 0xaa:
if (extended)
return false;
case 0xb6:
shift_pressed = 0;
return false;
break;
case 0x3a:
caps_pressed = 1;
return false;
break;
case 0xba:
caps_pressed = 0;
return false;
break;
case 0x53:
if (ctrl_pressed && alt_pressed)
bsp_reset(); /* ctrl+alt+del -> reboot */
break;
/*
* Ignore unrecognized keys--usually arrow and such
*/
default:
if ((inChar & 0x80) || (inChar > 0x39))
/* High-bit on means key is being released, not pressed */
return false;
break;
} /* switch */
/* Strip high bit, look up in our map */
inChar &= 0x7f;
if (ctrl_pressed)
{
*outChar = key_map[inChar];
*outChar &= 037;
}
else
{
*outChar = shift_pressed ? shift_map[inChar] : key_map[inChar];
if (caps_pressed)
{
if (*outChar >= 'A' && *outChar <= 'Z')
*outChar += 'a' - 'A';
else if (*outChar >= 'a' && *outChar <= 'z')
*outChar -= 'a' - 'A';
}
}
return true;
} /* _IBMPC_scankey */
/*-------------------------------------------------------------------------+
| Function: _IBMPC_keyboard_isr
| Description: Interrupt Service Routine for keyboard (0x01) IRQ.
| Global Variables: kbd_buffer, kbd_first, kbd_last.
| Arguments: vector - standard RTEMS argument - see documentation.
| Returns: standard return value - see documentation.
+--------------------------------------------------------------------------*/
void _IBMPC_keyboard_isr(void)
{
if (_IBMPC_scankey(&kbd_buffer[kbd_last]))
{
/* Got one; save it if there is enough room in buffer. */
unsigned int next = (kbd_last == kbd_end) ? 0 : kbd_last + 1;
if (next != kbd_first)
{
kbd_last = next;
}
}
} /* _IBMPC_keyboard_isr */
/*-------------------------------------------------------------------------+
| Function: _IBMPC_chrdy
| Description: Check keyboard ISR buffer and return character if not empty.
| Global Variables: kbd_buffer, kbd_first, kbd_last.
| Arguments: c - character read if keyboard buffer not empty, otherwise
| unchanged.
| Returns: true if keyboard buffer not empty, false otherwise.
+--------------------------------------------------------------------------*/
bool
_IBMPC_chrdy(char *c)
{
/* Check buffer our ISR builds */
if (kbd_first != kbd_last)
{
*c = kbd_buffer[kbd_first];
kbd_first = (kbd_first + 1) % KBD_BUF_SIZE;
return true;
}
else
return false;
} /* _IBMPC_chrdy */
/*-------------------------------------------------------------------------+
| Function: _IBMPC_inch
| Description: Poll keyboard until a character is ready and return it.
| Global Variables: None.
| Arguments: None.
| Returns: character read from keyboard.
+--------------------------------------------------------------------------*/
char
_IBMPC_inch(void)
{
char c;
while (!_IBMPC_chrdy(&c))
continue;
return c;
} /* _IBMPC_inch */
/*
* Routine that can be used before interrupt management is initialized.
*/
char
BSP_wait_polled_input(void)
{
char c;
while (!_IBMPC_scankey(&c))
continue;
return c;
}
/*-------------------------------------------------------------------------+
| Function: _IBMPC_inch_sleep
| Description: If charcter is ready return it, otherwise sleep until
| it is ready
| Global Variables: None.
| Arguments: None.
| Returns: character read from keyboard.
+--------------------------------------------------------------------------*/
char
_IBMPC_inch_sleep(void)
{
char c;
rtems_interval ticks_per_second;
ticks_per_second = 0;
for(;;)
{
if(_IBMPC_chrdy(&c))
{
return c;
}
if(ticks_per_second == 0)
{
rtems_clock_get(RTEMS_CLOCK_GET_TICKS_PER_SECOND,
&ticks_per_second);
}
rtems_task_wake_after((ticks_per_second+24)/25);
}
return c;
} /* _IBMPC_inch */
#endif
