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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 touchpad_lld.h
* @brief TOUCHPAD Driver subsystem low level driver header.
*
* @addgroup TOUCHPAD
* @{
*/
#ifndef _TOUCHPAD_LLD_H
#define _TOUCHPAD_LLD_H
#if HAL_USE_TOUCHPAD || defined(__DOXYGEN__)
/*===========================================================================*/
/* Include the low level driver configuration information */
/*===========================================================================*/
#include "touchpad_lld_config.h"
/*===========================================================================*/
/* Error checks. */
/*===========================================================================*/
#ifndef TOUCHPAD_HAS_IRQ
#define TOUCHPAD_HAS_IRQ FALSE
#endif
#ifndef TOUCHPAD_HAS_PRESSURE
#define TOUCHPAD_HAS_PRESSURE FALSE
#endif
#ifndef TOUCHPAD_SPI_PROLOGUE
#define TOUCHPAD_SPI_PROLOGUE()
#endif
#ifndef TOUCHPAD_SPI_EPILOGUE
#define TOUCHPAD_SPI_EPILOGUE()
#endif
/*===========================================================================*/
/* Driver types. */
/*===========================================================================*/
typedef struct _TOUCHPADDriver TOUCHPADDriver;
/**
* @brief Structure representing a Touchpad driver.
*/
struct _TOUCHPADDriver {
/*
* @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 tpIRQPort;
/*
* @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 tpIRQPin;
/*
* @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 TOUCHPAD_SPI_PROLOGUE() and TOUCHPAD_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;
};
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#ifdef __cplusplus
extern "C" {
#endif
/* Core functions */
void tp_lld_init(const TOUCHPADDriver *tp);
uint16_t tp_lld_read_value(uint8_t cmd);
uint16_t tp_lld_read_x(void);
uint16_t tp_lld_read_y(void);
#if TOUCHPAD_HAS_IRQ
uint8_t tp_lld_irq(void);
#endif
#if TOUCHPAD_HAS_PRESSURE
uint16_t tp_lld_read_z(void);
#endif
#ifdef __cplusplus
}
#endif
#endif /* HAL_USE_TOUCHPAD */
#endif /* _TOUCHPAD_LLD_H */
/** @} */
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