ginput/touch/MCU Olimex STM32 LCD board file
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Joel Bodenmann
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/*
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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/MCU/ginput_lld_mouse_board_olimex_stm32_lcd.h
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* @brief GINPUT Touch low level driver source for the MCU on the example board.
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*
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* @addtogroup GINPUT_MOUSE
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* @{
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*/
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#ifndef _GINPUT_LLD_MOUSE_BOARD_H
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#define _GINPUT_LLD_MOUSE_BOARD_H
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#define ADC_NUM_CHANNELS 2
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#define ADC_BUF_DEPTH 1
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static const ADCConversionGroup adc_y_config = {
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FALSE,
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ADC_NUM_CHANNELS,
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NULL,
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NULL,
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0, 0,
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0, 0,
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ADC_SQR1_NUM_CH(ADC_NUM_CHANNELS),
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0,
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ADC_SQR3_SQ2_N(ADC_CHANNEL_IN12) | ADC_SQR3_SQ1_N(ADC_CHANNEL_IN13)
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};
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static const ADCConversionGroup adc_x_config = {
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FALSE,
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ADC_NUM_CHANNELS,
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NULL,
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NULL,
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0, 0,
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0, 0,
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ADC_SQR1_NUM_CH(ADC_NUM_CHANNELS),
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0,
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ADC_SQR3_SQ2_N(ADC_CHANNEL_IN10) | ADC_SQR3_SQ1_N(ADC_CHANNEL_IN11)
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};
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/**
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* @brief Initialise the board for the touch.
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*
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* @notapi
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*/
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static __inline void init_board(void) {
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adcStart(&ADCD1, NULL);
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}
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/**
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* @brief Check whether the surface is currently touched
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* @return TRUE if the surface is currently touched
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*
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* @notapi
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*/
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static __inline bool_t getpin_pressed(void) {
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palSetPadMode(GPIOC, 0, PAL_MODE_INPUT_PULLDOWN);
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palSetPadMode(GPIOC, 1, PAL_MODE_INPUT);
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palSetPadMode(GPIOC, 2, PAL_MODE_INPUT);
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palSetPadMode(GPIOC, 3, PAL_MODE_OUTPUT_PUSHPULL);
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palSetPad(GPIOC, 3);
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return palReadPad(GPIOC, 0);
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}
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/**
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* @brief Aquire the bus ready for readings
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*
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* @notapi
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*/
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static __inline void aquire_bus(void) {
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}
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/**
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* @brief Release the bus after readings
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*
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* @notapi
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*/
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static __inline void release_bus(void) {
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}
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/**
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* @brief Read an x value from touch controller
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* @return The value read from the controller
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*
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* @notapi
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*/
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static __inline uint16_t read_x_value(void) {
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uint16_t val1, val2;
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adcsample_t samples[ADC_NUM_CHANNELS * ADC_BUF_DEPTH];
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palSetPadMode(GPIOC, 0, PAL_MODE_INPUT_ANALOG);
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palSetPadMode(GPIOC, 1, PAL_MODE_INPUT_ANALOG);
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palSetPadMode(GPIOC, 2, PAL_MODE_OUTPUT_PUSHPULL);
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palSetPadMode(GPIOC, 3, PAL_MODE_OUTPUT_PUSHPULL);
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palSetPad(GPIOC, 2);
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palClearPad(GPIOC, 3);
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chThdSleepMilliseconds(1);
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adcConvert(&ADCD1, &adc_x_config, samples, ADC_BUF_DEPTH);
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val1 = ((samples[0] + samples[1])/2);
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palClearPad(GPIOC, 2);
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palSetPad(GPIOC, 3);
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chThdSleepMilliseconds(1);
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adcConvert(&ADCD1, &adc_x_config, samples, ADC_BUF_DEPTH);
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val2 = ((samples[0] + samples[1])/2);
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return ((val1+((1<<12)-val2))/4);
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}
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/**
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* @brief Read an y value from touch controller
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* @return The value read from the controller
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*
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* @notapi
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*/
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static __inline uint16_t read_y_value(void) {
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uint16_t val1, val2;
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adcsample_t samples[ADC_NUM_CHANNELS * ADC_BUF_DEPTH];
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palSetPadMode(GPIOC, 2, PAL_MODE_INPUT_ANALOG);
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palSetPadMode(GPIOC, 3, PAL_MODE_INPUT_ANALOG);
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palSetPadMode(GPIOC, 0, PAL_MODE_OUTPUT_PUSHPULL);
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palSetPadMode(GPIOC, 1, PAL_MODE_OUTPUT_PUSHPULL);
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palSetPad(GPIOC, 1);
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palClearPad(GPIOC, 0);
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chThdSleepMilliseconds(1);
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adcConvert(&ADCD1, &adc_y_config, samples, ADC_BUF_DEPTH);
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val1 = ((samples[0] + samples[1])/2);
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palClearPad(GPIOC, 0);
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palSetPad(GPIOC, 1);
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chThdSleepMilliseconds(1);
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adcConvert(&ADCD1, &adc_y_config, samples, ADC_BUF_DEPTH);
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val2 = ((samples[0] + samples[1])/2);
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return ((val1+((1<<12)-val2))/4);
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}
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#endif /* _GINPUT_LLD_MOUSE_BOARD_H */
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/** @} */
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