128 lines
3.0 KiB
C
128 lines
3.0 KiB
C
/*
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* This file is subject to the terms of the GFX License, v1.0. If a copy of
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* the license was not distributed with this file, you can obtain one at:
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*
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* http://chibios-gfx.com/license.html
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*/
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/**
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* @file drivers/ginput/touch/MCU/ginput_lld_mouse.c
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* @brief GINPUT Touch low level driver source for the MCU.
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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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*/
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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_OLIMEX_STM32_LCD)
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#include "ginput_lld_mouse_board_olimex_stm32_lcd.h"
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#elif defined(BOARD_OLIMEX_PIC32MX_LCD)
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#include "ginput_lld_mouse_board_olimex_pic32mx_lcd.h"
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#else
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#include "ginput_lld_mouse_board.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 touchscreen 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.
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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_x_value();
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for(i = 0; i < 7; i++)
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sampleBuf[i] = read_x_value();
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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_y_value();
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for(i = 0; i < 7; i++)
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sampleBuf[i] = read_y_value();
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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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