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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 by Rob Purchase
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include "cpu.h"
#include "button.h"
#include "adc.h"
#include "pcf50606.h"
#include "backlight.h"
#include "touchscreen.h"
#include "stdlib.h"
#define NO_OF_TOUCH_DATA 5
static bool touch_available = false;
static short x[NO_OF_TOUCH_DATA], y[NO_OF_TOUCH_DATA];
/* comparator for qsort */
static int short_cmp(const void *a, const void *b)
{
return *(short*)a - *(short*)b;
}
void button_read_touch()
{
unsigned char buf[3];
static long last_touch_interrupt = 0;
static int touch_data_index = 0;
/* put the touchscreen into idle mode */
pcf50606_write(PCF5060X_ADCC1, 0);
/* here the touch coordinates are read 5 times */
/* they will be sorted and the middle one will be used */
pcf50606_write(PCF5060X_ADCC2, (0xE<<1) | 1); /* ADC start X+Y */
do {
buf[1] = pcf50606_read(PCF5060X_ADCS2);
} while (!(buf[1] & 0x80)); /* Busy wait on ADCRDY flag */
buf[0] = pcf50606_read(PCF5060X_ADCS1);
buf[2] = pcf50606_read(PCF5060X_ADCS3);
pcf50606_write(PCF5060X_ADCC2, 0); /* ADC stop */
if (TIME_AFTER(current_tick, last_touch_interrupt + 1))
{
/* resets the index if the last touch could not be read 5 times */
touch_data_index = 0;
}
x[touch_data_index] = (buf[0] << 2) | (buf[1] & 3);
y[touch_data_index] = (buf[2] << 2) | ((buf[1] & 0xC) >> 2);
touch_data_index++;
if (touch_data_index > NO_OF_TOUCH_DATA - 1)
{
/* coordinates 5 times read */
touch_available = true;
touch_data_index = 0;
}
else
{
/* put the touchscreen back into the interrupt mode */
pcf50606_write(PCF5060X_ADCC1, 1);
}
last_touch_interrupt = current_tick;
}
struct touch_calibration_point {
short px_x; /* known pixel value */
short px_y;
short val_x; /* touchscreen value at the known pixel */
short val_y;
};
static struct touch_calibration_point topleft, bottomright;
static int touch_to_pixels(short val_x, short val_y)
{
short x,y;
x=val_x;
y=val_y;
x = (x-topleft.val_x)*(bottomright.px_x - topleft.px_x)
/ (bottomright.val_x - topleft.val_x) + topleft.px_x;
y = (y-topleft.val_y)*(bottomright.px_y - topleft.px_y)
/ (bottomright.val_y - topleft.val_y) + topleft.px_y;
if (x < 0)
x = 0;
else if (x>=LCD_WIDTH)
x=LCD_WIDTH-1;
if (y < 0)
y = 0;
else if (y>=LCD_HEIGHT)
y=LCD_HEIGHT-1;
return (x<<16)|y;
}
void button_init_device(void)
{
/* Configure GPIOA 4 (POWER) and 8 (HOLD) for input */
GPIOA_DIR &= ~0x110;
/* Configure GPIOB 4 (button pressed) for input */
GPIOB_DIR &= ~0x10;
touch_available = false;
/* Arbitrary touchscreen calibration */
topleft.px_x = 0;
topleft.px_y = 0;
topleft.val_x = 50;
topleft.val_y = 50;
bottomright.px_x = LCD_WIDTH;
bottomright.px_y = LCD_HEIGHT;
bottomright.val_x = 980;
bottomright.val_y = 980;
}
bool button_hold(void)
{
return (GPIOA & 0x8) ? false : true;
}
int button_read_device(int *data)
{
int btn = BUTTON_NONE;
int adc;
static int old_data = 0;
static bool hold_button = false;
bool hold_button_old;
static bool touch_hold = false;
static long last_touch = 0;
*data = old_data;
hold_button_old = hold_button;
hold_button = button_hold();
#ifndef BOOTLOADER
if (hold_button != hold_button_old)
backlight_hold_changed(hold_button);
#endif
if (hold_button)
return BUTTON_NONE;
if (GPIOB & 0x4)
{
adc = adc_read(ADC_BUTTONS);
/* The following contains some arbitrary, but working, guesswork */
if (adc < 0x038) {
btn |= (BUTTON_MINUS | BUTTON_PLUS | BUTTON_MENU);
} else if (adc < 0x048) {
btn |= (BUTTON_MINUS | BUTTON_PLUS);
} else if (adc < 0x058) {
btn |= (BUTTON_PLUS | BUTTON_MENU);
} else if (adc < 0x070) {
btn |= BUTTON_PLUS;
} else if (adc < 0x090) {
btn |= (BUTTON_MINUS | BUTTON_MENU);
} else if (adc < 0x150) {
btn |= BUTTON_MINUS;
} else if (adc < 0x200) {
btn |= BUTTON_MENU;
}
}
if (touch_available || touch_hold)
{
short x_touch, y_touch;
static short last_x = 0, last_y = 0;
if (touch_hold)
{
/* get rid of very fast unintended double touches */
x_touch = last_x;
y_touch = last_y;
}
else
{
/* sort the 5 data taken and use the median value */
qsort(x, NO_OF_TOUCH_DATA, sizeof(short), short_cmp);
qsort(y, NO_OF_TOUCH_DATA, sizeof(short), short_cmp);
x_touch = last_x = x[(NO_OF_TOUCH_DATA - 1)/2];
y_touch = last_y = y[(NO_OF_TOUCH_DATA - 1)/2];
last_touch = current_tick;
touch_hold = true;
touch_available = false;
}
old_data = *data = touch_to_pixels(x_touch, y_touch);
btn |= touchscreen_to_pixels((*data&0xffff0000)>>16,
(*data&0x0000ffff),
data);
}
if (TIME_AFTER(current_tick, last_touch + 10))
{
/* put the touchscreen back into interrupt mode */
touch_hold = false;
pcf50606_write(PCF5060X_ADCC1, 1);
}
if (!(GPIOA & 0x4))
btn |= BUTTON_POWER;
if (btn & BUTTON_TOUCHSCREEN && !is_backlight_on(true))
old_data = *data = 0;
return btn;
}
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