147 lines
4.1 KiB
C
147 lines
4.1 KiB
C
/*
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ChibiOS-LCD-Driver - Copyright (C) 2012
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Joel Bodenmann aka Tectu <joel@unormal.org>
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This file is part of ChibiOS-LCD-Driver.
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ChibiOS-LCD-Driver 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-LCD-Driver 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 touchpadADS7843/touchpad_lld.c
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* @brief Touchpad Driver subsystem low level driver source.
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*
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* @addtogroup TOUCHPAD
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* @{
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*/
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#include "ch.h"
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#include "hal.h"
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#include "touchpad.h"
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#if HAL_USE_TOUCHPAD || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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#define TP_CS_HIGH palSetPad(TP_CS_PORT, TP_CS)
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#define TP_CS_LOW palClearPad(TP_CS_PORT, TP_CS)
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#ifdef UNUSED
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#elif defined(__GNUC__)
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# define UNUSED(x) UNUSED_ ## x __attribute__((unused))
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#elif defined(__LCLINT__)
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# define UNUSED(x) /*@unused@*/ x
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#else
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# define UNUSED(x) x
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#endif
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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#if !defined(__DOXYGEN__)
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TOUCHPADDriver Touchpad;
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#endif
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/*===========================================================================*/
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/* Driver local variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/* ---- Required Routines ---- */
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/**
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* @brief Low level Touchpad driver initialization.
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*
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* @notapi
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*/
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void tp_lld_init(TOUCHPADDriver *tp) {
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spiStart(tp->spid, tp->spicfg);
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}
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/**
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* @brief Reads out the X direction.
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*
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* @notapi
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*/
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uint16_t tp_lld_read_x(void) {
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uint8_t txbuf[1];
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uint8_t rxbuf[2];
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uint16_t y;
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txbuf[0] = 0xd0;
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TP_CS_LOW;
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spiSend(&SPID1, 1, txbuf);
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spiReceive(&SPID1, 2, rxbuf);
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TP_CS_HIGH;
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y = rxbuf[0] << 4;
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y |= rxbuf[1] >> 4;
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return y;
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}
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/*
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* @brief Reads out the X direction.
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*
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* @notapi
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*/
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uint16_t tp_lld_read_y(void) {
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uint8_t txbuf[1];
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uint8_t rxbuf[2];
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uint16_t y;
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txbuf[0] = 0x90;
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TP_CS_LOW;
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spiSend(&SPID1, 1, txbuf);
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spiReceive(&SPID1, 2, rxbuf);
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TP_CS_HIGH;
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y = rxbuf[0] << 4;
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y |= rxbuf[1] >> 4;
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return y;
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}
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/* ---- Optional Routines ---- */
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#if TOUCHPAD_HAS_IRQ || defined(__DOXYGEN__)
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/*
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* @brief for checking if touchpad is pressed or not.
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*
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* @return 1 if pressed / 0 if not pressed
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*
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* @noapi
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*/
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uint8_t tp_lld_irq(void) {
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return (!palReadPad(TP_IRQ_PORT, TP_IRQ));
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}
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#endif
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#endif /* HAL_USE_TOUCHPAD */
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/** @} */
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