120 lines
2.7 KiB
C
120 lines
2.7 KiB
C
/*
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* This file is subject to the terms of the GFX License. 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://ugfx.org/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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#include "ginput_lld_mouse_board.h"
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static uint16_t sampleBuf[7];
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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 We use a 7 sample medium filter on each coordinate to remove analogue noise.
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* @note During touch transition the ADC can return some very strange
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* results. To fix this behaviour we don't return until
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* we have tested the touch is in the same state at both the beginning
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* and the end of the reading.
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* @note Whilst x and y can return readings in any range so long as it fits in 16 bits,
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* the z value must be ranged by the board file to be a rough percentage. Anything
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* greater than 80% pressure is a touch.
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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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// Obtain access to the bus
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aquire_bus();
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// Read the ADC for z, x, y and then z again
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while(1) {
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setup_z();
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for(i = 0; i < 7; i++)
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sampleBuf[i] = read_z();
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filter();
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pt->z = (coord_t)sampleBuf[3];
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setup_x();
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for(i = 0; i < 7; i++)
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sampleBuf[i] = read_x();
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filter();
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pt->x = (coord_t)sampleBuf[3];
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setup_y();
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for(i = 0; i < 7; i++)
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sampleBuf[i] = read_y();
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filter();
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pt->y = (coord_t)sampleBuf[3];
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pt->buttons = pt->z >= 80 ? GINPUT_TOUCH_PRESSED : 0;
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setup_z();
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for(i = 0; i < 7; i++)
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sampleBuf[i] = read_z();
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filter();
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i = (coord_t)sampleBuf[3] >= 80 ? GINPUT_TOUCH_PRESSED : 0;
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if (pt->buttons == i)
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break;
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}
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// Release the bus
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release_bus();
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}
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#endif /* GFX_USE_GINPUT && GINPUT_NEED_MOUSE */
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/** @} */
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