Tectu
commit
df680e6d6e
5 changed files with 419 additions and 202 deletions
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@ -1,146 +1,237 @@
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/*
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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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||||
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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 x;
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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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x = rxbuf[0] << 4;
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x |= rxbuf[1] >> 4;
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return x;
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}
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/*
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* @brief Reads out the Y 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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/*
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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
|
||||
(at your option) any later version.
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||||
|
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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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||||
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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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#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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/*===========================================================================*/
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/* Driver local variables. */
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/*===========================================================================*/
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#if !defined(__DOXYGEN__)
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/* Local copy of the current touchpad driver */
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static const TOUCHPADDriver *tpDriver;
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static uint16_t sampleBuf[7];
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#endif
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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(const TOUCHPADDriver *tp) {
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tpDriver=tp;
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if (tpDriver->direct_init)
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spiStart(tpDriver->spip, tpDriver->spicfg);
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}
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/**
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* @brief Reads a conversion from the touchpad
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*
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* @param[in] cmd The command bits to send to the touchpad
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*
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* @return The read value 12-bit right-justified
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*
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* @note This function only reads data, it is assumed that the pins are
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* configured properly and the bus has been acquired beforehand
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*
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* @notapi
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*/
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uint16_t tp_lld_read_value(uint8_t cmd) {
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static uint8_t txbuf[3]={0};
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static uint8_t rxbuf[3]={0};
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uint16_t ret;
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txbuf[0]=cmd;
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spiExchange(tpDriver->spip, 3, txbuf, rxbuf);
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ret = (rxbuf[1] << 5) | (rxbuf[2] >> 3);
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return ret;
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}
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/**
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* @brief 7-point median filtering code for touchpad samples
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*
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* @note This is an internally used routine only.
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*
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* @notapi
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*/
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static void tp_lld_filter(void) {
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uint16_t temp;
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int i,j;
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for (i=0; i<4; i++) {
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for (j=i; j<7; j++) {
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if (sampleBuf[i] > sampleBuf[j]) {
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/* Swap the values */
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temp=sampleBuf[i];
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sampleBuf[i]=sampleBuf[j];
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sampleBuf[j]=temp;
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}
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}
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}
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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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* @note The samples are median filtered for greater noise reduction
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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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int i;
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#if defined(SPI_USE_MUTUAL_EXCLUSION)
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spiAcquireBus(tpDriver->spip);
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#endif
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TOUCHPAD_SPI_PROLOGUE();
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palClearPad(tpDriver->spicfg->ssport, tpDriver->spicfg->sspad);
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/* Discard the first conversion - very noisy and keep the ADC on hereafter
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* till we are done with the sampling. Note that PENIRQ is disabled.
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*/
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tp_lld_read_value(0xD1);
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for (i=0;i<7;i++) {
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sampleBuf[i]=tp_lld_read_value(0xD1);
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}
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/* Switch on PENIRQ once again - perform a dummy read */
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tp_lld_read_value(0xD0);
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palSetPad(tpDriver->spicfg->ssport, tpDriver->spicfg->sspad);
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TOUCHPAD_SPI_EPILOGUE();
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#if defined(SPI_USE_MUTUAL_EXCLUSION)
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spiReleaseBus(tpDriver->spip);
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#endif
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/* Find the median - use selection sort */
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tp_lld_filter();
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return sampleBuf[3];
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}
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/*
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* @brief Reads out the Y 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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int i;
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#if defined(SPI_USE_MUTUAL_EXCLUSION)
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spiAcquireBus(tpDriver->spip);
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#endif
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TOUCHPAD_SPI_PROLOGUE();
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palClearPad(tpDriver->spicfg->ssport, tpDriver->spicfg->sspad);
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/* Discard the first conversion - very noisy and keep the ADC on hereafter
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* till we are done with the sampling. Note that PENIRQ is disabled.
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*/
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tp_lld_read_value(0x91);
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for (i=0;i<7;i++) {
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sampleBuf[i]=tp_lld_read_value(0x91);
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}
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/* Switch on PENIRQ once again - perform a dummy read */
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tp_lld_read_value(0x90);
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palSetPad(tpDriver->spicfg->ssport, tpDriver->spicfg->sspad);
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TOUCHPAD_SPI_EPILOGUE();
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#ifdef SPI_USE_MUTUAL_EXCLUSION
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spiReleaseBus(tpDriver->spip);
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#endif
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/* Find the median - use selection sort */
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tp_lld_filter();
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return sampleBuf[3];
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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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* @notapi
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*/
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uint8_t tp_lld_irq(void) {
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return (!palReadPad(tpDriver->tpIRQPort, tpDriver->tpIRQPin));
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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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@ -36,9 +36,6 @@
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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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@ -52,13 +49,15 @@
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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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#if !defined(__DOXYGEN__)
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/* Local copy of the current touchpad driver */
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static const TOUCHPADDriver *tpDriver;
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static uint16_t sampleBuf[7];
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#endif
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/*===========================================================================*/
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/* Driver local functions. */
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|
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@ -79,30 +78,104 @@
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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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void tp_lld_init(const TOUCHPADDriver *tp) {
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tpDriver=tp;
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if (tpDriver->direct_init)
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spiStart(tpDriver->spip, tpDriver->spicfg);
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}
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/**
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* @brief Reads a conversion from the touchpad
|
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*
|
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* @param[in] cmd The command bits to send to the touchpad
|
||||
*
|
||||
* @return The read value 12-bit right-justified
|
||||
*
|
||||
* @note This function only reads data, it is assumed that the pins are
|
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* configured properly and the bus has been acquired beforehand
|
||||
*
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* @notapi
|
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*/
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uint16_t tp_lld_read_value(uint8_t cmd) {
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static uint8_t txbuf[3]={0};
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static uint8_t rxbuf[3]={0};
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uint16_t ret;
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txbuf[0]=cmd;
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spiExchange(tpDriver->spip, 3, txbuf, rxbuf);
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ret = (rxbuf[1] << 5) | (rxbuf[2] >> 3);
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return ret;
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}
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|
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/**
|
||||
* @brief 7-point median filtering code for touchpad samples
|
||||
*
|
||||
* @note This is an internally used routine only.
|
||||
*
|
||||
* @notapi
|
||||
*/
|
||||
static void tp_lld_filter(void) {
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uint16_t temp;
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int i,j;
|
||||
|
||||
for (i=0; i<4; i++) {
|
||||
for (j=i; j<7; j++) {
|
||||
if (sampleBuf[i] > sampleBuf[j]) {
|
||||
/* Swap the values */
|
||||
temp=sampleBuf[i];
|
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sampleBuf[i]=sampleBuf[j];
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sampleBuf[j]=temp;
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}
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}
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}
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||||
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Reads out the X direction.
|
||||
*
|
||||
* @note The samples are median filtered for greater noise reduction
|
||||
*
|
||||
* @notapi
|
||||
*/
|
||||
uint16_t tp_lld_read_x(void) {
|
||||
uint8_t txbuf[1];
|
||||
uint8_t rxbuf[2];
|
||||
uint16_t x;
|
||||
int i;
|
||||
|
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txbuf[0] = 0xd0;
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TP_CS_LOW;
|
||||
spiSend(&SPID1, 1, txbuf);
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spiReceive(&SPID1, 2, rxbuf);
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TP_CS_HIGH;
|
||||
#if defined(SPI_USE_MUTUAL_EXCLUSION)
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spiAcquireBus(tpDriver->spip);
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#endif
|
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|
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x = rxbuf[0] << 4;
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x |= rxbuf[1] >> 4;
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TOUCHPAD_SPI_PROLOGUE();
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palClearPad(tpDriver->spicfg->ssport, tpDriver->spicfg->sspad);
|
||||
|
||||
return x;
|
||||
/* Discard the first conversion - very noisy and keep the ADC on hereafter
|
||||
* till we are done with the sampling. Note that PENIRQ is disabled.
|
||||
*/
|
||||
tp_lld_read_value(0xD1);
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||||
|
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for (i=0;i<7;i++) {
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sampleBuf[i]=tp_lld_read_value(0xD1);
|
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}
|
||||
|
||||
/* Switch on PENIRQ once again - perform a dummy read */
|
||||
tp_lld_read_value(0xD0);
|
||||
|
||||
palSetPad(tpDriver->spicfg->ssport, tpDriver->spicfg->sspad);
|
||||
TOUCHPAD_SPI_EPILOGUE();
|
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|
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#if defined(SPI_USE_MUTUAL_EXCLUSION)
|
||||
spiReleaseBus(tpDriver->spip);
|
||||
#endif
|
||||
|
||||
/* Find the median - use selection sort */
|
||||
tp_lld_filter();
|
||||
|
||||
return sampleBuf[3];
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -111,20 +184,38 @@ uint16_t tp_lld_read_x(void) {
|
|||
* @notapi
|
||||
*/
|
||||
uint16_t tp_lld_read_y(void) {
|
||||
uint8_t txbuf[1];
|
||||
uint8_t rxbuf[2];
|
||||
uint16_t y;
|
||||
int i;
|
||||
|
||||
txbuf[0] = 0x90;
|
||||
TP_CS_LOW;
|
||||
spiSend(&SPID1, 1, txbuf);
|
||||
spiReceive(&SPID1, 2, rxbuf);
|
||||
TP_CS_HIGH;
|
||||
#if defined(SPI_USE_MUTUAL_EXCLUSION)
|
||||
spiAcquireBus(tpDriver->spip);
|
||||
#endif
|
||||
|
||||
y = rxbuf[0] << 4;
|
||||
y |= rxbuf[1] >> 4;
|
||||
TOUCHPAD_SPI_PROLOGUE();
|
||||
palClearPad(tpDriver->spicfg->ssport, tpDriver->spicfg->sspad);
|
||||
|
||||
return y;
|
||||
/* Discard the first conversion - very noisy and keep the ADC on hereafter
|
||||
* till we are done with the sampling. Note that PENIRQ is disabled.
|
||||
*/
|
||||
tp_lld_read_value(0x91);
|
||||
|
||||
for (i=0;i<7;i++) {
|
||||
sampleBuf[i]=tp_lld_read_value(0x91);
|
||||
}
|
||||
|
||||
/* Switch on PENIRQ once again - perform a dummy read */
|
||||
tp_lld_read_value(0x90);
|
||||
|
||||
palSetPad(tpDriver->spicfg->ssport, tpDriver->spicfg->sspad);
|
||||
TOUCHPAD_SPI_EPILOGUE();
|
||||
|
||||
#ifdef SPI_USE_MUTUAL_EXCLUSION
|
||||
spiReleaseBus(tpDriver->spip);
|
||||
#endif
|
||||
|
||||
/* Find the median - use selection sort */
|
||||
tp_lld_filter();
|
||||
|
||||
return sampleBuf[3];
|
||||
}
|
||||
|
||||
/* ---- Optional Routines ---- */
|
||||
|
|
@ -137,7 +228,7 @@ uint16_t tp_lld_read_y(void) {
|
|||
* @notapi
|
||||
*/
|
||||
uint8_t tp_lld_irq(void) {
|
||||
return (!palReadPad(TP_IRQ_PORT, TP_IRQ));
|
||||
return (!palReadPad(tpDriver->tpIRQPort, tpDriver->tpIRQPin));
|
||||
}
|
||||
#endif
|
||||
|
||||
|
|
|
|||
|
|
@ -70,7 +70,7 @@ struct cal {
|
|||
extern "C" {
|
||||
#endif
|
||||
|
||||
void tpInit(TOUCHPADDriver *tp);
|
||||
void tpInit(const TOUCHPADDriver *tp);
|
||||
uint16_t tpReadX(void);
|
||||
uint16_t tpReadY(void);
|
||||
|
||||
|
|
|
|||
|
|
@ -49,41 +49,76 @@
|
|||
#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;
|
||||
typedef struct _TOUCHPADDriver TOUCHPADDriver;
|
||||
|
||||
/**
|
||||
* @brief Structure representing a Touchpad driver.
|
||||
*/
|
||||
struct TOUCHPADDriver {
|
||||
/*
|
||||
* @brief Pointer to SPI driver.
|
||||
*/
|
||||
SPIDriver *spid;
|
||||
struct _TOUCHPADDriver {
|
||||
/*
|
||||
* @brief Pointer to SPI driver.
|
||||
* @note SPI driver must be enabled in mcuconf.h and halconf.h
|
||||
*/
|
||||
SPIDriver *spip;
|
||||
|
||||
/*
|
||||
* @brief SPI configuration.
|
||||
*/
|
||||
SPIConfig *spicfg;
|
||||
/*
|
||||
* @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. */
|
||||
/*===========================================================================*/
|
||||
|
||||
#if !defined(__DOXYGEN__)
|
||||
extern TOUCHPADDriver Touchpad;
|
||||
#endif
|
||||
|
||||
#ifdef __cplusplus
|
||||
extern "C" {
|
||||
#endif
|
||||
|
||||
/* Core functions */
|
||||
void tp_lld_init(TOUCHPADDriver *tp);
|
||||
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);
|
||||
|
||||
|
|
|
|||
|
|
@ -69,13 +69,13 @@ static uint16_t _tpReadRealX(void) {
|
|||
uint32_t results = 0;
|
||||
uint16_t i, x;
|
||||
|
||||
/* Median filtering is already done in LLD */
|
||||
for(i = 0; i < CONVERSIONS; i++) {
|
||||
tp_lld_read_x(); /* dummy, reduce noise on SPI */
|
||||
results += tp_lld_read_x();
|
||||
}
|
||||
}
|
||||
|
||||
// 12-bit
|
||||
x = (((SCREEN_WIDTH-1) * (results/CONVERSIONS)) / 2048);
|
||||
/* Take the average of the readings */
|
||||
x = results / CONVERSIONS;
|
||||
|
||||
return x;
|
||||
}
|
||||
|
|
@ -89,13 +89,13 @@ static uint16_t _tpReadRealY(void) {
|
|||
uint32_t results = 0;
|
||||
uint16_t i, y;
|
||||
|
||||
/* Median filtering is already done in LLD */
|
||||
for(i = 0; i < CONVERSIONS; i++) {
|
||||
tp_lld_read_y(); /* dummy, reduce noise on SPI */
|
||||
results += tp_lld_read_y();
|
||||
}
|
||||
}
|
||||
|
||||
// 12-bit
|
||||
y = (((SCREEN_HEIGHT-1) * (results/CONVERSIONS)) / 2048);
|
||||
/* Take the average of the readings */
|
||||
y = results / CONVERSIONS;
|
||||
|
||||
return y;
|
||||
}
|
||||
|
|
@ -135,7 +135,7 @@ static void _tpDrawCross(uint16_t x, uint16_t y) {
|
|||
*
|
||||
* @api
|
||||
*/
|
||||
void tpInit(TOUCHPADDriver *tp) {
|
||||
void tpInit(const TOUCHPADDriver *tp) {
|
||||
/* Initialise Mutex */
|
||||
//MUTEX_INIT
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue