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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"
#include "ginput_lld_mouse_board_embest_dmstf4bb.h"
static coord_t lastx, lasty, lastz;
/* 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
write_reg(STMPE811_REG_SYS_CTRL2, 1, 0x0C); // Temp. sensor clock off, GPIO clock off, touch clock on, ADC clock on
write_reg(STMPE811_REG_INT_EN, 1, 0x03); // Interrupt on INT pin when FIFO is equal or above threshold value OR touch is detected
write_reg(STMPE811_REG_ADC_CTRL1, 1, 0x48); // ADC conversion time = 80 clock ticks, 12-bit ADC, internaal 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
// @TODO: decide which value should STMPE811_REG_TSC_CFG have - either 0x9A or from comment;)
write_reg(STMPE811_REG_TSC_CFG, 1, 0x9A); // Averaging 4, Touch detect delay 1ms, Panel driver settling time 1ms
write_reg(STMPE811_REG_FIFO_TH, 1, 0x01); // FIFO threshold =1
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, 0x03); // X&Y only, TSC enable
write_reg(STMPE811_REG_INT_STA, 1, 0xFF); // Clear all interrupts
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) {
uint16_t buf;
// if not touched, return the previous results
if(!getpin_pressed()) {
pt->x = lastx;
pt->y = lasty;
pt->z = 0;
pt->buttons = 0;
return;
}
/* Get the X value */
buf = read_reg(STMPE811_REG_TSC_DATA_X, 2);
lastx = (coord_t)(buf);
/* Get the Y value */
buf = read_reg(STMPE811_REG_TSC_DATA_Y, 2);
lasty = (coord_t)(buf);
/* Get the Z value */
buf = read_reg(STMPE811_REG_TSC_DATA_Z, 1);
lastz = (buf & 0x00FF);
// Return the results
pt->x = lastx;
pt->y = lasty;
pt->z = 100;
pt->buttons = GINPUT_TOUCH_PRESSED;
}
#endif /* GFX_USE_GINPUT && GINPUT_NEED_MOUSE */
/** @} */
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