142 lines
3.6 KiB
C
142 lines
3.6 KiB
C
/*
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ChibiOS/GFX - Copyright (C) 2012
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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/ADS7843/ginput_lld_mouse.c
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* @brief GINPUT Touch low level driver source for the ADS7843.
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*
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* @addtogroup GINPUT_MOUSE
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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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#if (GFX_USE_GINPUT && GINPUT_NEED_MOUSE) /*|| defined(__DOXYGEN__)*/
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#include "ginput/lld/mouse.h"
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#if defined(GINPUT_MOUSE_USE_CUSTOM_BOARD) && GINPUT_MOUSE_USE_CUSTOM_BOARD
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#include "ginput_lld_mouse_board.h"
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#elif defined(BOARD_FIREBULL_STM32_F103)
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#include "ginput_lld_mouse_board_firebull_stm32f103.h"
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#else
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#include "ginput_lld_mouse_board_example.h"
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#endif
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static uint16_t sampleBuf[7];
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static coord_t lastx, lasty;
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/**
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* @brief 7-point median filtering code for touch samples
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*
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* @note This is an internally used routine only.
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*
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* @notapi
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*/
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static void filter(void) {
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uint16_t temp;
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int i,j;
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for(i = 0; i < 4; i++) {
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for(j = i; j < 7; j++) {
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if(sampleBuf[i] > sampleBuf[j]) {
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/* Swap the values */
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temp = sampleBuf[i];
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sampleBuf[i] = sampleBuf[j];
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sampleBuf[j] = temp;
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}
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}
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}
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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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}
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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 i;
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// If touch-off 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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// Read the port to get the touch settings
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aquire_bus();
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/* Get the X value
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* Discard the first conversion - very noisy and keep the ADC on hereafter
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* till we are done with the sampling. Note that PENIRQ is disabled while reading.
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* Finally switch on PENIRQ once again - perform a dummy read.
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* Once we have the readings, find the medium using our filter function
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*/
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read_value(0xD1);
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for(i = 0; i < 7; i++)
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sampleBuf[i] = read_value(0xD1);
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read_value(0xD0);
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filter();
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lastx = (coord_t)sampleBuf[3];
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/* Get the Y value using the same process as above */
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read_value(0x91);
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for(i = 0; i < 7; i++)
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sampleBuf[i] = read_value(0x91);
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read_value(0x90);
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filter();
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lasty = (coord_t)sampleBuf[3];
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// Release the bus
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release_bus();
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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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