129 lines
4.3 KiB
C
129 lines
4.3 KiB
C
/*
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ChibiOS/GFX - Copyright (C) 2012, 2013
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Joel Bodenmann aka Tectu <joel@unormal.org>
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This file is part of ChibiOS/GFX.
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ChibiOS/GFX is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/GFX is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file drivers/ginput/touch/STMPE811/ginput_lld_mouse.c
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* @brief GINPUT Touch low level driver source for the STMPE811.
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*
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* @defgroup Mouse Mouse
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* @ingroup GINPUT
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* @{
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*/
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#include "ch.h"
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#include "hal.h"
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#include "gfx.h"
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#include "stmpe811.h"
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#if (GFX_USE_GINPUT && GINPUT_NEED_MOUSE) /*|| defined(__DOXYGEN__)*/
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#include "ginput/lld/mouse.h"
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#include "ginput_lld_mouse_board_embest_dmstf4bb.h"
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static coord_t lastx, lasty, lastz;
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/* set the active window of the stmpe811. bl is bottom left, tr is top right */
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static void setActiveWindow(uint16_t bl_x, uint16_t bl_y, uint16_t tr_x, uint16_t tr_y) {
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write_reg(STMPE811_REG_WDW_TR_X, 2, tr_x);
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write_reg(STMPE811_REG_WDW_TR_Y, 2, tr_y);
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write_reg(STMPE811_REG_WDW_BL_X, 2, bl_x);
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write_reg(STMPE811_REG_WDW_BL_Y, 2, bl_y);
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}
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/**
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* @brief Initialise the mouse/touch.
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*
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* @notapi
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*/
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void ginput_lld_mouse_init(void) {
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init_board();
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write_reg(STMPE811_REG_SYS_CTRL1, 1, 0x02); // Software chip reset
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write_reg(STMPE811_REG_SYS_CTRL2, 1, 0x0C); // Temp. sensor clock off, GPIO clock off, touch clock on, ADC clock on
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write_reg(STMPE811_REG_INT_EN, 1, 0x03); // Interrupt on INT pin when FIFO is equal or above threshold value OR touch is detected
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write_reg(STMPE811_REG_ADC_CTRL1, 1, 0x48); // ADC conversion time = 80 clock ticks, 12-bit ADC, internaal voltage refernce
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chThdSleepMilliseconds(2);
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write_reg(STMPE811_REG_ADC_CTRL2, 1, 0x01); // ADC speed 3.25MHz
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write_reg(STMPE811_REG_GPIO_AF, 1, 0x00); // GPIO alternate function - OFF
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// @TODO: decide which value should STMPE811_REG_TSC_CFG have - either 0x9A or from comment;)
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write_reg(STMPE811_REG_TSC_CFG, 1, 0x9A); // Averaging 4, Touch detect delay 1ms, Panel driver settling time 1ms
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write_reg(STMPE811_REG_FIFO_TH, 1, 0x01); // FIFO threshold =1
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write_reg(STMPE811_REG_FIFO_STA, 1, 0x01); // FIFO reset enable
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write_reg(STMPE811_REG_FIFO_STA, 1, 0x00); // FIFO reset disable
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write_reg(STMPE811_REG_TSC_FRACT_XYZ, 1, 0x07); // Z axis data format
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write_reg(STMPE811_REG_TSC_I_DRIVE, 1, 0x01); // 50mA touchscreen line current
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write_reg(STMPE811_REG_TSC_CTRL, 1, 0x03); // X&Y only, TSC enable
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write_reg(STMPE811_REG_INT_STA, 1, 0xFF); // Clear all interrupts
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write_reg(STMPE811_REG_INT_CTRL, 1, 0x01); // Level interrupt, enable intrrupts
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}
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/**
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* @brief Read the mouse/touch position.
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*
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* @param[in] pt A pointer to the structure to fill
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*
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* @note For drivers that don't support returning a position
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* when the touch is up (most touch devices), it should
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* return the previous position with the new Z value.
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* The z value is the pressure for those touch devices
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* that support it (-100 to 100 where > 0 is touched)
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* or, 0 or 100 for those drivers that don't.
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*
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* @notapi
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*/
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void ginput_lld_mouse_get_reading(MouseReading *pt) {
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uint16_t buf;
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// if not touched, return the previous results
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if(!getpin_pressed()) {
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pt->x = lastx;
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pt->y = lasty;
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pt->z = 0;
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pt->buttons = 0;
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return;
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}
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/* Get the X value */
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buf = read_reg(STMPE811_REG_TSC_DATA_X, 2);
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lastx = (coord_t)(buf);
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/* Get the Y value */
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buf = read_reg(STMPE811_REG_TSC_DATA_Y, 2);
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lasty = (coord_t)(buf);
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/* Get the Z value */
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buf = read_reg(STMPE811_REG_TSC_DATA_Z, 1);
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lastz = (buf & 0x00FF);
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// Return the results
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pt->x = lastx;
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pt->y = lasty;
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pt->z = 100;
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pt->buttons = GINPUT_TOUCH_PRESSED;
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}
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#endif /* GFX_USE_GINPUT && GINPUT_NEED_MOUSE */
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/** @} */
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