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/*
ChibiOS/GFX - Copyright (C) 2012
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/touchscreen/MCU/touchscreen_lld.c
* @brief Touchscreen Driver subsystem low level driver source.
*
* @addtogroup TOUCHSCREEN
* @{
*/
#include "ch.h"
#include "hal.h"
#include "touchscreen.h"
#if GFX_USE_TOUCHSCREEN /*|| defined(__DOXYGEN__)*/
#define ADC_NUM_CHANNELS 2
#define ADC_BUF_DEPTH 1
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
static const TouchscreenDriver *ts;
static const ADCConversionGroup adc_y_config = {
FALSE,
ADC_NUM_CHANNELS,
NULL,
NULL,
0, 0,
0, 0,
ADC_SQR1_NUM_CH(ADC_NUM_CHANNELS),
0,
ADC_SQR3_SQ2_N(ADC_CHANNEL_IN12) | ADC_SQR3_SQ1_N(ADC_CHANNEL_IN13)
};
static const ADCConversionGroup adc_x_config = {
FALSE,
ADC_NUM_CHANNELS,
NULL,
NULL,
0, 0,
0, 0,
ADC_SQR1_NUM_CH(ADC_NUM_CHANNELS),
0,
ADC_SQR3_SQ2_N(ADC_CHANNEL_IN10) | ADC_SQR3_SQ1_N(ADC_CHANNEL_IN11)
};
/**
* @brief Low level Touchscreen driver initialization.
*
* @param[in] ts The touchscreen driver struct
*
* @notapi
*/
void ts_lld_init(const TouchscreenDriver *ts_init) {
ts = ts_init;
adcStart(ts->adc_driver, NULL);
}
/**
* @brief 7-point median filtering code for touchscreen samples
*
* @note This is an internally used routine only.
*
* @notapi
*/
static void ts_lld_filter(void) {
return 0;
}
/**
* @brief Reads out the X direction.
*
* @note The samples are median filtered for greater noise reduction
*
* @notapi
*/
uint16_t ts_lld_read_x(void) {
uint16_t val1, val2;
adcsample_t samples[ADC_NUM_CHANNELS * ADC_BUF_DEPTH];
palSetPadMode(ts->yd_port, ts->yd_pin, PAL_MODE_INPUT_ANALOG);
palSetPadMode(ts->yu_port, ts->yu_pin, PAL_MODE_INPUT_ANALOG);
palSetPadMode(ts->xl_port, ts->xl_pin, PAL_MODE_OUTPUT_PUSHPULL);
palSetPadMode(ts->xr_port, ts->xr_pin, PAL_MODE_OUTPUT_PUSHPULL);
palSetPad(ts->xl_port, ts->xl_pin);
palClearPad(ts->xr_port, ts->xr_pin);
chThdSleepMilliseconds(1);
adcConvert(ts->adc_driver, &adc_x_config, samples, ADC_BUF_DEPTH);
val1 = ((samples[0] + samples[1])/2);
palClearPad(ts->xl_port, ts->xl_pin);
palSetPad(ts->xr_port, ts->xr_pin);
chThdSleepMilliseconds(1);
adcConvert(ts->adc_driver, &adc_x_config, samples, ADC_BUF_DEPTH);
val2 = ((samples[0] + samples[1])/2);
return ((val1+((1<<12)-val2))/4);
}
/**
* @brief Reads out the Y direction.
*
* @notapi
*/
uint16_t ts_lld_read_y(void) {
uint16_t val1, val2;
adcsample_t samples[ADC_NUM_CHANNELS * ADC_BUF_DEPTH];
palSetPadMode(ts->xl_port, ts->xl_pin, PAL_MODE_INPUT_ANALOG);
palSetPadMode(ts->xr_port, ts->xr_pin, PAL_MODE_INPUT_ANALOG);
palSetPadMode(ts->yd_port, ts->yd_pin, PAL_MODE_OUTPUT_PUSHPULL);
palSetPadMode(ts->yu_port, ts->yu_pin, PAL_MODE_OUTPUT_PUSHPULL);
palSetPad(ts->yu_port, ts->yu_pin);
palClearPad(ts->yd_port, ts->yd_pin);
chThdSleepMilliseconds(1);
adcConvert(ts->adc_driver, &adc_y_config, samples, ADC_BUF_DEPTH);
val1 = ((samples[0] + samples[1])/2);
palClearPad(ts->yu_port, ts->yu_pin);
palSetPad(ts->yd_port, ts->yd_pin);
chThdSleepMilliseconds(1);
adcConvert(ts->adc_driver, &adc_y_config, samples, ADC_BUF_DEPTH);
val2 = ((samples[0] + samples[1])/2);
return ((val1+((1<<12)-val2))/4);
}
/*
* @brief Checks if touchscreen is pressed or not.
*
* @return 1 if pressed, 0 otherwise
*
* @notapi
*/
uint8_t ts_lld_pressed(void) {
palSetPadMode(ts->yd_port, ts->yd_pin, PAL_MODE_INPUT_PULLDOWN);
palSetPadMode(ts->yu_port, ts->yu_pin, PAL_MODE_INPUT);
palSetPadMode(ts->xl_port, ts->xl_pin, PAL_MODE_INPUT);
palSetPadMode(ts->xr_port, ts->xr_pin, PAL_MODE_OUTPUT_PUSHPULL);
palSetPad(ts->xr_port, ts->xr_pin);
return palReadPad(ts->yd_port, ts->yd_pin);
}
#endif /* GFX_USE_TOUCHSCREEN */
/** @} */
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