blanker.c

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#include "blanker.h"
#include <drv/kbd.h>
#include <drv/timer.h>

/* Time without input events before starting blanker */
#define BLK_BLANKTIMEOUT    (15 * 1000) /* ms */

// TODO: move to blanker_hw.h
#include <drv/power.h>
#define BLK_LCDON   power_LcdOn()
#define BLK_LCDOFF  power_LcdOff()


static KbdHandler blk_KbdHandler;

static ticks_t blk_lastevent;

static bool blk_enabled;

static bool blk_active;


static bool blk_on(void)
{
    if (!blk_active)
    {
        blk_active = true;
        BLK_LCDOFF;
    }
    return true;
}


static void blk_off(void)
{
    if (blk_active)
    {
        blk_active = false;
        BLK_LCDON;
    }
}


void blk_retrigger(void)
{
    blk_lastevent = timer_clock();
    blk_off();
}

#if 0

static void blk_hack(void)
{
    static signed char blk_colstart[LCD_COLS];
    UBYTE row, col;


    if (rand()%3 == 0)
    {
        /* Modify one column */
        col = rand() % LCD_COLS;
        blk_colstart[col] += rand() % 12 - 5;
    }

    for (col = 0; col < LCD_COLS; ++col)
    {
        if (blk_colstart[col] > 0)
        {
            --blk_colstart[col];

            /* Scroll down */
            for(row = LCD_ROWS-1; row; --row)
            {
                lcd_SetAddr(blk_layer, LCD_POS(col,row));
                lcd_PutChar(blk_layer->Buf[LCD_POS(col,row-1)], blk_layer);
            }

            /* Add new kanji */
            lcd_SetAddr(blk_layer, LCD_POS(col,0));
            lcd_PutChar((char)(rand() % 127 + 128), blk_layer);
        }
        else if (blk_colstart[col] < 0)
        {
            ++blk_colstart[col];

            /* Clear tail */
            for(row = 0; row < LCD_ROWS; ++row)
            {
                if (blk_layer->Buf[LCD_POS(col,row)] != ' ')
                {
                    lcd_SetAddr(blk_layer, LCD_POS(col,row));
                    lcd_PutChar(' ', blk_layer);
                    break;
                }
            }
        }
    }
}
#endif


static keymask_t blk_handlerFunc(keymask_t key)
{
    /* key used to turn off blanker */
    static keymask_t offkey;

    ticks_t now = timer_clock();

    /* If key pressed */
    if (key != 0)
    {
        blk_lastevent = now;
        if (blk_active)
        {
            blk_off();

            /* remember and eat key event */
            offkey = key;
            key = 0;
        }
        else if (key == offkey)
        {
            /* keep eating the key until released */
            key = 0;
        }

        /* pass key through */
        return key;
    }

    /* reset off key */
    offkey = 0;

    /* Blank timeout reached? */
    if (now - blk_lastevent > ms_to_ticks(BLK_BLANKTIMEOUT))
    {
        /* Enable blanker unless already done */
        if (!blk_active && !blk_on())
            return 0;

#if 0
        /* Do some nice visual effect */
        blk_hack();
#endif /* _DEBUG */
    }

    return 0;
}


void blk_enable(void)
{
    if (!blk_enabled)
    {
        blk_active = false;
        blk_lastevent = timer_clock();

        /* Add display blanker handler */
        blk_KbdHandler.hook = blk_handlerFunc;
        blk_KbdHandler.pri = 100; /* high priority */
        blk_KbdHandler.flags = KHF_RAWKEYS;
        kbd_addHandler(&blk_KbdHandler);

        blk_enabled = true;
    }
}


void blk_disable(void)
{
    if (blk_enabled)
    {
        kbd_remHandler(&blk_KbdHandler);
        blk_off();
        blk_enabled = false;
    }
}