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/*
ChibiOS-LCD-Driver - Copyright (C) 2012
Joel Bodenmann aka Tectu <joel@unormal.org>
This file is part of ChibiOS-LCD-Driver.
ChibiOS-LCD-Driver 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-LCD-Driver 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 touchpadXPT2046/touchpad_lld.c
* @brief Touchpad Driver subsystem low level driver source.
*
* @addtogroup TOUCHPAD
* @{
*/
#include "ch.h"
#include "hal.h"
#include "touchpad.h"
#if HAL_USE_TOUCHPAD || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
#define TP_CS_HIGH palSetPad(TP_CS_PORT, TP_CS)
#define TP_CS_LOW palClearPad(TP_CS_PORT, TP_CS)
#ifdef UNUSED
#elif defined(__GNUC__)
# define UNUSED(x) UNUSED_ ## x __attribute__((unused))
#elif defined(__LCLINT__)
# define UNUSED(x) /*@unused@*/ x
#else
# define UNUSED(x) x
#endif
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
#if !defined(__DOXYGEN__)
TOUCHPADDriver Touchpad;
#endif
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/* ---- Required Routines ---- */
/**
* @brief Low level Touchpad driver initialization.
*
* @notapi
*/
void tp_lld_init(TOUCHPADDriver *tp) {
spiStart(tp->spid, tp->spicfg);
}
/**
* @brief Reads out the X direction.
*
* @notapi
*/
uint16_t tp_lld_read_x(void) {
uint8_t txbuf[1];
uint8_t rxbuf[2];
uint16_t x;
txbuf[0] = 0xd0;
TP_CS_LOW;
spiSend(&SPID1, 1, txbuf);
spiReceive(&SPID1, 2, rxbuf);
TP_CS_HIGH;
x = rxbuf[0] << 4;
x |= rxbuf[1] >> 4;
return x;
}
/*
* @brief Reads out the Y direction.
*
* @notapi
*/
uint16_t tp_lld_read_y(void) {
uint8_t txbuf[1];
uint8_t rxbuf[2];
uint16_t y;
txbuf[0] = 0x90;
TP_CS_LOW;
spiSend(&SPID1, 1, txbuf);
spiReceive(&SPID1, 2, rxbuf);
TP_CS_HIGH;
y = rxbuf[0] << 4;
y |= rxbuf[1] >> 4;
return y;
}
/* ---- Optional Routines ---- */
#if TOUCHPAD_HAS_IRQ || defined(__DOXYGEN__)
/*
* @brief for checking if touchpad is pressed or not.
*
* @return 1 if pressed / 0 if not pressed
*
* @notapi
*/
uint8_t tp_lld_irq(void) {
return (!palReadPad(TP_IRQ_PORT, TP_IRQ));
}
#endif
#if TOUCHPAD_HAS_PRESSURE || defined(__DOXYGEN__)
/*
* @brief Reads out the Z direction / pressure.
*
* @notapi
*/
uint16_t tp_lld_read_z(void) {
/* ToDo */
return 42;
}
#endif
#endif /* HAL_USE_TOUCHPAD */
/** @} */