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//==========================================================================

//

//        kbd_support.c

//

//        Cirrus Logic EDB7xxx eval board ASCII keyboard support functions

//

//==========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under

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// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

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// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):     gthomas

// Contributors:  gthomas

// Date:          1999-05-15

// Description:   Functions used to support ASCII keyboard

//####DESCRIPTIONEND####

static char kbd_server_stack[STACK_SIZE];

static cyg_thread kbd_server_thread_data;

static cyg_handle_t kbd_server_thread_handle;

static cyg_interrupt kbd_interrupt;

static cyg_handle_t  kbd_interrupt_handle;

static cyg_mbox      kbd_events_mbox;

static cyg_handle_t  kbd_events_mbox_handle;

static cyg_sem_t     kbd_sem;

static cyg_uint8 col_state[8];

static cyg_uint8 ext_state[8];

static void

kbd_delay(void)

{

    volatile int i;

    for (i = 0;  i < 250;  i++) ;

}

static void

kbd_scan(void)

{

    int i;

    cyg_uint8 port_data, ext_data;

    // Turn off drive (de-select) all columns

    *(volatile cyg_uint32 *)SYSCON1 = (*(volatile cyg_uint32 *)SYSCON1 & ~SYSCON1_KBD_CTL) |

        SYSCON1_KBD_LOW;

    for (i = 0;  i < 8;  i++) {

        // Select column 'i'

        *(volatile cyg_uint32 *)SYSCON1 = (*(volatile cyg_uint32 *)SYSCON1 & ~SYSCON1_KBD_CTL) |

            SYSCON1_KBD_COL(i);

        // Small pause to let the wires charge up :-)

        kbd_delay();

        // Grab the data

        col_state[i] = port_data = *(volatile cyg_uint8 *)PADR;

        ext_state[i] = ext_data = *(volatile cyg_uint8 *)KBD_PORT;

        // De-Select column 'i'

        *(volatile cyg_uint32 *)SYSCON1 = (*(volatile cyg_uint32 *)SYSCON1 & ~SYSCON1_KBD_CTL) |

            SYSCON1_KBD_TRISTATE;

        // Allow line to go slack

        kbd_delay();

    }

    // Turn on drive (select) all columns - necessary to see interrupts

    *(volatile cyg_uint32 *)SYSCON1 = (*(volatile cyg_uint32 *)SYSCON1 & ~SYSCON1_KBD_CTL) |

        SYSCON1_KBD_HIGH;

}

static cyg_uint8     kbd_state[128];      // Known state of each key

static cyg_uint8     kbd_new_state[128];  // Current state of each key

// Row #1

#define KBD_Escape     0x00

#define KBD_F1         0x01

#define KBD_F2         0x02

#define KBD_F3         0x03

#define KBD_F4         0x04

#define KBD_F5         0x05

#define KBD_F6         0x06

#define KBD_F7         0x07

#define KBD_F8         0x08

#define KBD_F9         0x09

#define KBD_F10        0x0A

#define KBD_NumLock    0x0B

#define KBD_SysReq     0x0C

#define KBD_ScrlLock   0x0D

#define KBD_Break      0x0E

// Row #2

#define KBD_1          0x10

#define KBD_2          0x11

#define KBD_3          0x12

#define KBD_4          0x13

#define KBD_5          0x14

#define KBD_6          0x15

#define KBD_7          0x16

#define KBD_8          0x17

#define KBD_9          0x18

#define KBD_0          0x19

#define KBD_Hyphen     0x1A

#define KBD_Equals     0x1B

#define KBD_BackSpace  0x1C

#define KBD_Home       0x1D

// Row #3

#define KBD_Tab        0x20

#define KBD_Q          0x21

#define KBD_W          0x22

#define KBD_E          0x23

#define KBD_R          0x24

#define KBD_T          0x25

#define KBD_Y          0x26

#define KBD_U          0x27

#define KBD_I          0x28

#define KBD_O          0x29

#define KBD_P          0x2A

#define KBD_LeftBrkt   0x2B

#define KBD_RightBrkt  0x2C

#define KBD_BackSlash  0x2D

#define KBD_PageUp     0x2E

// Row #4

#define KBD_CapsLock   0x30

#define KBD_A          0x31

#define KBD_S          0x32

#define KBD_D          0x33

#define KBD_F          0x34

#define KBD_G          0x35

#define KBD_H          0x36

#define KBD_J          0x37

#define KBD_K          0x38

#define KBD_L          0x39

#define KBD_SemiColon  0x3A

#define KBD_Quote      0x3B

#define KBD_Enter      0x3C

#define KBD_PageDown   0x3D

// Row #5

#define KBD_LeftShift  0x40

#define KBD_Z          0x41

#define KBD_X          0x42

#define KBD_C          0x43

#define KBD_V          0x44

#define KBD_B          0x45

#define KBD_N          0x46

#define KBD_M          0x47

#define KBD_Comma      0x48

#define KBD_Period     0x49

#define KBD_Slash      0x4A

#define KBD_RightShift 0x4B

#define KBD_UpArrow    0x4C

#define KBD_End        0x4D

// Row #6

#define KBD_Ctrl       0x50

#define KBD_Function   0x51

#define KBD_LeftAlt    0x52

#define KBD_Accent     0x53

#define KBD_Space      0x54

#define KBD_RightAlt   0x55

#define KBD_Ins        0x56

#define KBD_Del        0x57

#define KBD_LeftArrow  0x58

#define KBD_DownArrow  0x59

#define KBD_RightArrow 0x5A

#define KBD_Press      0x80  // Event has this bit when the key is pressed

#define KBD_Empty      0xFF

// Map column, bit -> keycode

static cyg_uint32    kbd_map[8][16] = {

    // Column #0

    {KBD_Escape,    KBD_1,          KBD_Tab,        KBD_CapsLock,

     KBD_BackSlash, KBD_Space,      KBD_LeftArrow,  KBD_UpArrow,

     KBD_DownArrow, KBD_RightArrow, KBD_LeftShift,  KBD_Ctrl,

     KBD_Function,  KBD_LeftAlt,    KBD_RightAlt,   KBD_RightShift },

    // Column #1

    {KBD_F5,        KBD_6,          KBD_T,          KBD_G,

     KBD_B,         KBD_Slash,      KBD_SemiColon,  KBD_P,

     KBD_Hyphen,    KBD_F10,        KBD_Empty,      KBD_Empty,

     KBD_Empty,     KBD_Empty,      KBD_Empty,      KBD_Empty     },

    // Column #2

    {KBD_F4,        KBD_5,          KBD_R,          KBD_F,

     KBD_V,         KBD_Del,        KBD_Quote,      KBD_LeftBrkt,

     KBD_Equals,    KBD_NumLock,    KBD_Empty,      KBD_Empty,

     KBD_Empty,     KBD_Empty,      KBD_Empty,      KBD_Empty },

    // Column #3

    {KBD_F3,        KBD_4,          KBD_E,          KBD_D,

     KBD_C,         KBD_Ins,        KBD_Empty,      KBD_RightBrkt,

     KBD_BackSpace, KBD_SysReq,     KBD_Empty,      KBD_Empty,

     KBD_Empty,     KBD_Empty,      KBD_Empty,      KBD_Empty },

    // Column #4

    {KBD_F2,        KBD_3,          KBD_W,          KBD_S,

     KBD_X,         KBD_Empty,      KBD_Enter,      KBD_Empty,

     KBD_Empty,     KBD_ScrlLock,   KBD_Empty,      KBD_Empty,

     KBD_Empty,     KBD_Empty,      KBD_Empty,      KBD_Empty },

    // Column #5

    {KBD_F1,        KBD_2,          KBD_Q,          KBD_A,

     KBD_Z,         KBD_End,        KBD_PageDown,   KBD_PageUp,

     KBD_Home,      KBD_Break,      KBD_Empty,      KBD_Empty,

     KBD_Empty,     KBD_Empty,      KBD_Empty,      KBD_Empty },

    // Column #6

    {KBD_F6,        KBD_7,          KBD_Y,          KBD_H,

     KBD_N,         KBD_Period,     KBD_L,          KBD_O,

     KBD_0,         KBD_F9,         KBD_Empty,      KBD_Empty,

     KBD_Empty,     KBD_Empty,      KBD_Empty,      KBD_Empty },

    // Column #7

    {KBD_F7,        KBD_8,          KBD_U,          KBD_J,

     KBD_M,         KBD_Comma,      KBD_K,          KBD_I,

     KBD_9,         KBD_F8,         KBD_Empty,      KBD_Empty,

     KBD_Empty,     KBD_Empty,      KBD_Empty,      KBD_Empty },

};

static cyg_uint8 kbd_chars[96] = {

    /* 0x00 - 0x0F */

    0x1B, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

    /* 0x10 - 0x1F */

     '1',  '2',  '3',  '4',  '5',  '6',  '7',  '8',  '9',  '0',  '-',  '=', 0x08, 0x00, 0x00, 0x00,

    /* 0x20 - 0x2F */

    '\t',  'q',  'w',  'e',  'r',  't',  'y',  'u',  'i',  'o',  'p',  '[',  ']', '\\', 0x00, 0x00,

    /* 0x30 - 0x3F */

    0x00,  'a',  's',  'd',  'f',  'g',  'h',  'j',  'k',  'l',  ';', '\'', 0x0D, 0x00, 0x00, 0x00,

    /* 0x40 - 0x4F */

    0x00,  'z',  'x',  'c',  'v',  'b',  'n',  'm',  ',',  '.',  '/', 0x00, 0x00, 0x00, 0x00, 0x00,

    /* 0x50 - 0x5F */

    0x00, 0x00, 0x00, 0x00,  ' ', 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

};

static cyg_uint8 kbd_shifted_chars[96] = {

    /* 0x00 - 0x0F */

    '\b', 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

    /* 0x10 - 0x1F */

     '!',  '@',  '#',  '$',  '%',  '^',  '&',  '*',  '(',  ')',  '_',  '+', 0x08, 0x00, 0x00, 0x00,

    /* 0x20 - 0x2F */

    '\t',  'Q',  'W',  'E',  'R',  'T',  'Y',  'U',  'I',  'O',  'P',  '{',  '}',  '|', 0x00, 0x00,

    /* 0x30 - 0x3F */

    0x00,  'A',  'S',  'D',  'F',  'G',  'H',  'J',  'K',  'L',  ':',  '"', 0x0D, 0x00, 0x00, 0x00,

    /* 0x40 - 0x4F */

    0x00,  'Z',  'X',  'C',  'V',  'B',  'N',  'M',  '<',  '>',  '?', 0x00, 0x00, 0x00, 0x00, 0x00,

    /* 0x50 - 0x5F */

    0x00, 0x00, 0x00, 0x00,  ' ', 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

};

// This ISR is called when the keyboard interrupt occurs

static int

keyboard_isr(cyg_vector_t vector, cyg_addrword_t data, HAL_SavedRegisters *regs)

{

    cyg_drv_interrupt_mask(CYGNUM_HAL_INTERRUPT_KBDINT);

    return (CYG_ISR_HANDLED|CYG_ISR_CALL_DSR);  // Run the DSR

}

// This DSR handles the keyboard [logical] processing

static void

keyboard_dsr(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)

{

    // Tell the keyboard processing thread to give it a shot

    cyg_semaphore_post(&kbd_sem);

}

static void

kbd_server(cyg_addrword_t p)

{

    int col, bit, key, event, timeout;

    diag_printf("KBD server here\n");

    while (TRUE) {

        cyg_semaphore_wait(&kbd_sem);

        // As long as keys are pressed, scan and update

        timeout = 0;

        while (TRUE) {

            // Wait for 20ms - time to debounce keyboard

            cyg_thread_delay(2);

            // Scan keyboard

            kbd_scan();

            // Reset state

            for (key = 0;  key < sizeof(kbd_new_state);  key++) {

                kbd_new_state[key] = 0;

            }

            // Check state of all keys and send events for those that change

            for (col = 0;  col < 8;  col++) {

                for (bit = 0;  bit < 8;  bit++) {

                    if (col_state[col] & (1<<bit)) {

                        key = kbd_map[col][bit];

                        if (key != KBD_Empty) {

                            kbd_new_state[key] = 1;

                        }

                    }

                    if (ext_state[col] & (1<<bit)) {

                        key = kbd_map[col][bit+8];

                        if (key != KBD_Empty) {

                            kbd_new_state[key] = 1;

                        }

                    }

                }

            }

            // Compare new and old (known) states, generate events for changes

            // Send events for modifier keys first.

            for (key = 0;  key < sizeof(kbd_new_state);  key++) {

                if (kbd_state[key] != kbd_new_state[key]) {

                    event = 0xFF;

                    switch (key) {

                    case KBD_LeftShift:

                    case KBD_RightShift:

                    case KBD_Ctrl:

                    case KBD_LeftAlt:

                    case KBD_RightAlt:

                    case KBD_Function:

                    case KBD_CapsLock:

                        if (kbd_state[key]) {

                            // Key going up

                            event = key;

                        } else {

                            // Key going down

                            event = key + KBD_Press;

                        }

                        kbd_state[key] = kbd_new_state[key];

                    }

                    if (event != 0xFF) {

                        if (!cyg_mbox_tryput(kbd_events_mbox_handle, (void *)event)) {

                            diag_printf("KBD event lost: %x\n", event);

                        }

                    }

                }

            }

            // First key up events

            for (key = 0;  key < sizeof(kbd_new_state);  key++) {

                if (kbd_state[key] != kbd_new_state[key]) {

                    if (kbd_state[key]) {

                        // Key going up

                        event = key;

                    } else {

                        // Key going down

                        event = key + KBD_Press;

                    }

                    if (!cyg_mbox_tryput(kbd_events_mbox_handle, (void *)event)) {

                        diag_printf("KBD event lost: %x\n", event);

                    }

                }

                kbd_state[key] = kbd_new_state[key];

            }

            // Clear interrupt (true when keys are pressed)

            cyg_drv_interrupt_acknowledge(CYGNUM_HAL_INTERRUPT_KBDINT);

#if 0

            if (*(volatile cyg_uint32 *)INTSR2 & INTSR2_KBDINT) {

                timeout = 0;

            } else if (++timeout == 5) {

                // No keys for 100ms

                break;

            }

#endif

        }

        // Allow interrupts to happen again

        cyg_drv_interrupt_acknowledge(CYGNUM_HAL_INTERRUPT_KBDINT);

        cyg_drv_interrupt_unmask(CYGNUM_HAL_INTERRUPT_KBDINT);

    }

}

void

kbd_init(void)

{

    // Initialize environment, setup interrupt handler

    cyg_drv_interrupt_create(CYGNUM_HAL_INTERRUPT_KBDINT,

                             99,                     // Priority - what goes here?

                             0,                      //  Data item passed to interrupt handler

                             (cyg_ISR_t *)keyboard_isr,

                             (cyg_DSR_t *)keyboard_dsr,

                             &kbd_interrupt_handle,

                             &kbd_interrupt);

    cyg_drv_interrupt_attach(kbd_interrupt_handle);

    cyg_drv_interrupt_acknowledge(CYGNUM_HAL_INTERRUPT_KBDINT);

    cyg_drv_interrupt_unmask(CYGNUM_HAL_INTERRUPT_KBDINT);

    // Set up the mbox for keyboard data

    cyg_mbox_create(&kbd_events_mbox_handle, &kbd_events_mbox);

    // This semaphore is set when there is a keypress

    cyg_semaphore_init(&kbd_sem, 0);

    // Create a thread whose job it is to de-bounce the keyboard and

    // actually process the input, turning it into a series of events

    cyg_thread_create(10,                           // Priority - just a number

                      kbd_server,                   // entry

                      0,                            // initial parameter

                      "KBD_server",                 // Name

                      &kbd_server_stack[0],         // Stack

                      STACK_SIZE,                   // Size

                      &kbd_server_thread_handle,    // Handle

                      &kbd_server_thread_data       // Thread data structure

            );

    cyg_thread_resume(kbd_server_thread_handle);  // Start it

}

#define MOD_Shift    0x40

#define MOD_Ctrl     0x20

#define MOD_CapsLock 0x10

static cyg_uint32    kbd_modifiers;

cyg_uint8

kbd_getc(void)

{

    cyg_uint8 ch;

    cyg_uint32 kbd_event;

    while (TRUE) {

        kbd_event = (cyg_uint32)cyg_mbox_get(kbd_events_mbox_handle);

        switch (kbd_event & 0x7F) {

        case KBD_LeftShift:

        case KBD_RightShift:

            if (kbd_event & KBD_Press) {

                kbd_modifiers |= MOD_Shift;

            } else {

                kbd_modifiers &= ~MOD_Shift;

            }

            break;

        case KBD_Ctrl:

            if (kbd_event & KBD_Press) {

                kbd_modifiers |= MOD_Ctrl;

            } else {

                kbd_modifiers &= ~MOD_Ctrl;

            }

            break;

        case KBD_CapsLock:

            if (kbd_event & KBD_Press) {

                kbd_modifiers ^= MOD_CapsLock;

            }

            break;

        case KBD_LeftAlt:

        case KBD_RightAlt:

        case KBD_Function:

        default:

        }

        // Return character [if one has arrived]

        if (kbd_event & KBD_Press) {

            if (kbd_modifiers & (MOD_Shift|MOD_CapsLock)) {

                ch = kbd_shifted_chars[kbd_event & 0x7F];

            } else {

                ch = kbd_chars[kbd_event & 0x7F];

            }

            if (kbd_modifiers & MOD_Ctrl) {

                ch &= 0x1F;

            }

            if (ch) {

                return (ch);

            }

        }

    }

}