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/*
ChibiOS/GFX - Copyright (C) 2012, 2013
Joel Bodenmann aka Tectu <joel@unormal.org>
This file is part of ChibiOS/GFX.
ChibiOS/GFX 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 3 of the License, or
(at your option) any later version.
ChibiOS/GFX is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or 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 with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file drivers/ginput/touch/STMPE811/ginput_lld_mouse.c
* @brief GINPUT Touch low level driver source for the STMPE811.
*
* @defgroup Mouse Mouse
* @ingroup GINPUT
* @{
*/
#include "ch.h"
#include "hal.h"
#include "gfx.h"
#include "stmpe811.h"
#if (GFX_USE_GINPUT && GINPUT_NEED_MOUSE) /*|| defined(__DOXYGEN__)*/
#include "ginput/lld/mouse.h"
#if defined(GINPUT_MOUSE_USE_CUSTOM_BOARD) && GINPUT_MOUSE_USE_CUSTOM_BOARD
#include "ginput_lld_mouse_board.h"
#elif defined(BOARD_EMBEST_DMSTF4BB)
#include "ginput_lld_mouse_board_embest_dmstf4bb.h"
#else
#include "ginput_lld_mouse_board_example.h"
#endif
#ifndef STMP811_NO_GPIO_IRQPIN
#define STMP811_NO_GPIO_IRQPIN FALSE
#endif
#ifndef STMP811_SLOW_CPU
#define STMP811_SLOW_CPU FALSE
#endif
static coord_t x, y, z;
static uint8_t touched;
/* set the active window of the stmpe811. bl is bottom left, tr is top right */
static void setActiveWindow(uint16_t bl_x, uint16_t bl_y, uint16_t tr_x, uint16_t tr_y)
{
write_reg(STMPE811_REG_WDW_TR_X, 2, tr_x);
write_reg(STMPE811_REG_WDW_TR_Y, 2, tr_y);
write_reg(STMPE811_REG_WDW_BL_X, 2, bl_x);
write_reg(STMPE811_REG_WDW_BL_Y, 2, bl_y);
}
/**
* @brief Initialise the mouse/touch.
*
* @notapi
*/
void ginput_lld_mouse_init(void)
{
init_board();
write_reg(STMPE811_REG_SYS_CTRL1, 1, 0x02); // Software chip reset
chThdSleepMilliseconds(10);
write_reg(STMPE811_REG_SYS_CTRL2, 1, 0x0C); // Temperature sensor clock off, GPIO clock off, touch clock on, ADC clock on
#if STMP811_NO_GPIO_IRQPIN
write_reg(STMPE811_REG_INT_EN, 1, 0x00); // Interrupt on INT pin when touch is detected
#else
write_reg(STMPE811_REG_INT_EN, 1, 0x01); // Interrupt on INT pin when touch is detected
#endif
write_reg(STMPE811_REG_ADC_CTRL1, 1, 0x48); // ADC conversion time = 80 clock ticks, 12-bit ADC, internal voltage refernce
chThdSleepMilliseconds(2);
write_reg(STMPE811_REG_ADC_CTRL2, 1, 0x01); // ADC speed 3.25MHz
write_reg(STMPE811_REG_GPIO_AF, 1, 0x00); // GPIO alternate function - OFF
write_reg(STMPE811_REG_TSC_CFG, 1, 0x9A); // Averaging 4, touch detect delay 500 us, panel driver settling time 500 us
write_reg(STMPE811_REG_FIFO_TH, 1, 0x40); // FIFO threshold = 64
write_reg(STMPE811_REG_FIFO_STA, 1, 0x01); // FIFO reset enable
write_reg(STMPE811_REG_FIFO_STA, 1, 0x00); // FIFO reset disable
write_reg(STMPE811_REG_TSC_FRACT_XYZ, 1, 0x07); // Z axis data format
write_reg(STMPE811_REG_TSC_I_DRIVE, 1, 0x01); // 50mA touchscreen line current
write_reg(STMPE811_REG_TSC_CTRL, 1, 0x00); // X&Y&Z
write_reg(STMPE811_REG_TSC_CTRL, 1, 0x01); // X&Y&Z, TSC enable
write_reg(STMPE811_REG_INT_STA, 1, 0xFF); // Clear all interrupts
#if !STMP811_NO_GPIO_IRQPIN
touched = (uint8_t)read_reg(STMPE811_REG_TSC_CTRL, 1) & 0x80;
#endif
write_reg(STMPE811_REG_INT_CTRL, 1, 0x01); // Level interrupt, enable intrrupts
}
/**
* @brief Read the mouse/touch position.
*
* @param[in] pt A pointer to the structure to fill
*
* @note For drivers that don't support returning a position
* when the touch is up (most touch devices), it should
* return the previous position with the new Z value.
* The z value is the pressure for those touch devices
* that support it (-100 to 100 where > 0 is touched)
* or, 0 or 100 for those drivers that don't.
*
* @notapi
*/
void ginput_lld_mouse_get_reading(MouseReading *pt)
{
bool_t clearfifo; // Do we need to clear the FIFO
#if STMP811_NO_GPIO_IRQPIN
// Poll to get the touched status
uint8_t last_touched;
last_touched = touched;
touched = (uint8_t)read_reg(STMPE811_REG_TSC_CTRL, 1) & 0x80;
clearfifo = (touched != last_touched);
#else
// Check if the touch controller IRQ pin has gone off
clearfifo = false;
if(getpin_irq()) { // please rename this to getpin_irq
write_reg(STMPE811_REG_INT_STA, 1, 0xFF); // clear all interrupts
touched = (uint8_t)read_reg(STMPE811_REG_TSC_CTRL, 1) & 0x80; // set the new touched status
clearfifo = true; // only take the last FIFO reading
}
#endif
// If not touched, return the previous results
if (!touched) {
pt->x = x;
pt->y = y;
pt->z = 0;
pt->buttons = 0;
return;
}
#if !STMP811_SLOW_CPU
if (!clearfifo && (read_reg(STMPE811_REG_FIFO_STA, 1) & 0xD0))
#endif
clearfifo = true;
do {
/* Get the X, Y, Z values */
/* This could be done in a single 4 byte read to STMPE811_REG_TSC_DATA_XYZ (incr or non-incr) */
x = (coord_t)read_reg(STMPE811_REG_TSC_DATA_X, 2);
y = (coord_t)read_reg(STMPE811_REG_TSC_DATA_Y, 2);
z = (coord_t)read_reg(STMPE811_REG_TSC_DATA_Z, 1);
} while(clearfifo && !(read_reg(STMPE811_REG_FIFO_STA, 1) & 0x20));
// Rescale X,Y,Z - X & Y don't need scaling when you are using calibration!
#if !GINPUT_MOUSE_NEED_CALIBRATION
x = gdispGetWidth() - x / (4096/gdispGetWidth());
y = y / (4096/gdispGetHeight());
#endif
z = (((z&0xFF) * 100)>>8) + 1;
// Return the results. ADC gives values from 0 to 2^12 (4096)
pt->x = x;
pt->y = y;
pt->z = z;
pt->buttons = GINPUT_TOUCH_PRESSED;
/* Force another read if we have more results */
if (!clearfifo && !(read_reg(STMPE811_REG_FIFO_STA, 1) & 0x20))
ginputMouseWakeup();
}
#endif /* GFX_USE_GINPUT && GINPUT_NEED_MOUSE */
/** @} */
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