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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 include/touchscreen_lld.h
* @brief TOUCHSCREEN Driver subsystem low level driver header.
*
* @addtogroup TOUCHSCREEN
* @{
*/
#ifndef TOUCHSCREEN_LLD_H
#define TOUCHSCREEN_LLD_H
#if GFX_USE_TOUCHSCREEN || defined(__DOXYGEN__)
/*===========================================================================*/
/* Include the low level driver configuration information */
/*===========================================================================*/
#include "touchscreen_lld_config.h"
/*===========================================================================*/
/* Error checks. */
/*===========================================================================*/
#ifndef TOUCHSCREEN_NEED_MULTITHREAD
#define TOUCHSCREEN_NEED_MULTITHREAD FALSE
#endif
#ifndef TOUCHSCREEN_XY_INVERTED
#define TOUCHSCREEN_XY_INVERTED FALSE
#endif
#ifndef TOUCHSCREEN_HAS_IRQ
#define TOUCHSCREEN_HAS_IRQ FALSE
#endif
#ifndef TOUCHSCREEN_HAS_PRESSURE
#define TOUCHSCREEN_HAS_PRESSURE FALSE
#endif
#ifndef TOUCHSCREEN_SPI_PROLOGUE
#define TOUCHSCREEN_SPI_PROLOGUE()
#endif
#ifndef TOUCHSCREEN_SPI_EPILOGUE
#define TOUCHSCREEN_SPI_EPILOGUE()
#endif
/*===========================================================================*/
/* Driver types. */
/*===========================================================================*/
/**
* @brief Structure representing a touchscreen driver.
*/
typedef struct TouchscreenDriver {
/*
* @brief Pointer to SPI driver.
* @note SPI driver must be enabled in mcuconf.h and halconf.h
*/
SPIDriver *spip;
/*
* @brief Pointer to the SPI configuration structure.
* @note The lowest possible speed ~ 1-2MHz is to be used, otherwise
* will result in a lot of noise
*/
const SPIConfig *spicfg;
/*
* @brief Touchscreen controller TPIRQ pin GPIO port
*/
ioportid_t tsIRQPort;
/*
* @brief Touchscreen controller TPIRQ GPIO pin
* @note The interface is polled as of now, interrupt support is
* to be implemented in the future.
*/
ioportmask_t tsIRQPin;
/*
* @brief Initialize the SPI with the configuration struct given or not
* If TRUE, spiStart is called by the init, otherwise not
* @note This is provided in such a case when SPI port is being shared
* across multiple peripherals, so not to disturb the SPI bus.
* You can use TOUCHSCREEN_SPI_PROLOGUE() and TOUCHSCREEN_SPI_EPILOGUE()
* macros to change the SPI configuration or speed before and
* after using the touchpad. An example case would be sharing the
* bus with a fast flash memory chip.
*/
bool_t direct_init;
} TouchscreenDriver;
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#ifdef __cplusplus
extern "C" {
#endif
/* Core functions */
void ts_lld_init(const TouchscreenDriver *ts);
uint16_t ts_lld_read_value(uint8_t cmd);
uint16_t ts_lld_read_x(void);
uint16_t ts_lld_read_y(void);
#if TOUCHSCREEN_HAS_IRQ
uint8_t ts_lld_pressed(void);
#endif
#if TOUCHSCREEN_HAS_PRESSURE
uint16_t ts_lld_read_z(void);
#endif
#ifdef __cplusplus
}
#endif
#endif /* GFX_USE_TOUCHSCREEN */
#endif /* _TOUCHSCREEN_LLD_H */
/** @} */
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