/* ChibiOS-LCD-Driver - Copyright (C) 2012 Joel Bodenmann aka Tectu 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 . */ /** * @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 y; txbuf[0] = 0xd0; TP_CS_LOW; spiSend(&SPID1, 1, txbuf); spiReceive(&SPID1, 2, rxbuf); TP_CS_HIGH; y = rxbuf[0] << 4; y |= rxbuf[1] >> 4; return y; } /* * @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 */ /** @} */