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/*
ChibiOS/GFX - Copyright (C) 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/MCU/ginput_lld_mouse_board_olimex_stm32_lcd.h
* @brief GINPUT Touch low level driver source for the MCU on the example board.
*
* @defgroup Mouse Mouse
* @ingroup GINPUT
*
* @{
*/
#ifndef _GINPUT_LLD_MOUSE_BOARD_H
#define _GINPUT_LLD_MOUSE_BOARD_H
static const ADCConfig ADCC = {
.vref = ADC_VREF_CFG_AVDD_AVSS,
.stime = 15,
.irq = EIC_IRQ_ADC,
.base = _ADC10_BASE_ADDRESS,
};
static struct ADCDriver ADCD;
#define YNEG 13 // U
#define XNEG 15 // R
#define XPOS 12 // L
#define YPOS 11 // D
#define ADC_MAX 1023
#define TOUCH_THRESHOULD 50
static const ADCConversionGroup ADC_X_CG = {
.circular = FALSE,
.num_channels = 1,
.channels = 1 << XNEG,
};
static const ADCConversionGroup ADC_Y_CG = {
.circular = FALSE,
.num_channels = 1,
.channels = 1 << YPOS,
};
/**
* @brief Initialise the board for the touch.
*
* @notapi
*/
static inline void init_board(void) {
adcObjectInit(&ADCD);
adcStart(&ADCD, &ADCC);
}
/**
* @brief Check whether the surface is currently touched
* @return TRUE if the surface is currently touched
*
* @notapi
*/
static inline bool_t getpin_pressed(void) {
adcsample_t samples[2] = {0, };
// Set X+ to ground
palSetPadMode(IOPORTB, XPOS, PAL_MODE_OUTPUT);
palClearPad(IOPORTB, XPOS);
// Set Y- to VCC
palSetPadMode(IOPORTB, YNEG, PAL_MODE_OUTPUT);
palSetPad(IOPORTB, YNEG);
palSetPadMode(IOPORTB, XNEG, PAL_MODE_INPUT_ANALOG);
palSetPadMode(IOPORTB, YPOS, PAL_MODE_INPUT_ANALOG);
adcConvert(&ADCD, &ADC_X_CG, &samples[0], 1);
adcConvert(&ADCD, &ADC_Y_CG, &samples[1], 1);
return (ADC_MAX - (samples[1] - samples[0])) > TOUCH_THRESHOULD;
}
/**
* @brief Aquire the bus ready for readings
*
* @notapi
*/
static inline void aquire_bus(void) {
}
/**
* @brief Release the bus after readings
*
* @notapi
*/
static inline void release_bus(void) {
}
/**
* @brief Read an x value from touch controller
* @return The value read from the controller
*
* @notapi
*/
static inline uint16_t read_x_value(void) {
adcsample_t sample;
palSetPadMode(IOPORTB, XPOS, PAL_MODE_OUTPUT);
palSetPad(IOPORTB, XPOS);
palSetPadMode(IOPORTB, XNEG, PAL_MODE_OUTPUT);
palClearPad(IOPORTB, XNEG);
palSetPadMode(IOPORTB, YNEG, PAL_MODE_INPUT);
palSetPadMode(IOPORTB, YPOS, PAL_MODE_INPUT_ANALOG);
adcConvert(&ADCD, &ADC_Y_CG, &sample, 1);
return ADC_MAX - sample;
}
/**
* @brief Read an y value from touch controller
* @return The value read from the controller
*
* @notapi
*/
static inline uint16_t read_y_value(void) {
adcsample_t sample;
palSetPadMode(IOPORTB, YNEG, PAL_MODE_OUTPUT);
palClearPad(IOPORTB, YNEG);
palSetPadMode(IOPORTB, YPOS, PAL_MODE_OUTPUT);
palSetPad(IOPORTB, YPOS);
palSetPadMode(IOPORTB, XPOS, PAL_MODE_INPUT);
palSetPadMode(IOPORTB, XNEG, PAL_MODE_INPUT_ANALOG);
adcConvert(&ADCD, &ADC_X_CG, &sample, 1);
return ADC_MAX - sample;
}
#endif /* _GINPUT_LLD_MOUSE_BOARD_H */
/** @} */
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