diff options
Diffstat (limited to 'drivers/touchscreen/ADS7843/touchscreen_lld.c')
| -rw-r--r-- | drivers/touchscreen/ADS7843/touchscreen_lld.c | 241 |
1 files changed, 0 insertions, 241 deletions
diff --git a/drivers/touchscreen/ADS7843/touchscreen_lld.c b/drivers/touchscreen/ADS7843/touchscreen_lld.c deleted file mode 100644 index 9b5d4aa0..00000000 --- a/drivers/touchscreen/ADS7843/touchscreen_lld.c +++ /dev/null @@ -1,241 +0,0 @@ -/*
- 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 drivers/touchscreen/ADS7843/touchscreen_lld.c
- * @brief Touchscreen Driver subsystem low level driver source.
- *
- * @addtogroup TOUCHSCREEN
- * @{
- */
-
-#include "ch.h"
-#include "hal.h"
-#include "touchscreen.h"
-
-#if GFX_USE_TOUCHSCREEN /*|| defined(__DOXYGEN__)*/
-
-/*===========================================================================*/
-/* Driver local definitions. */
-/*===========================================================================*/
-
-/*===========================================================================*/
-/* Driver exported variables. */
-/*===========================================================================*/
-
-/*===========================================================================*/
-/* Driver local variables. */
-/*===========================================================================*/
-#if !defined(__DOXYGEN__)
- /* Local copy of the current touchscreen driver */
- static const TouchscreenDriver *tsDriver;
-
- static uint16_t sampleBuf[7];
-#endif
-
-/*===========================================================================*/
-/* Driver local functions. */
-/*===========================================================================*/
-
-/*===========================================================================*/
-/* Driver interrupt handlers. */
-/*===========================================================================*/
-
-/*===========================================================================*/
-/* Driver exported functions. */
-/*===========================================================================*/
-
-/* ---- Required Routines ---- */
-
-/**
- * @brief Low level touchscreen driver initialization.
- *
- * @param[in] ts The touchscreen driver
- *
- * @notapi
- */
-void ts_lld_init(const TouchscreenDriver *ts) {
- tsDriver = ts;
-
- if(tsDriver->direct_init)
- spiStart(tsDriver->spip, tsDriver->spicfg);
-}
-
-
-/**
- * @brief Reads a conversion from the touchscreen
- *
- * @param[in] cmd The command bits to send to the touchscreen
- *
- * @return The read value 12-bit right-justified
- *
- * @note This function only reads data, it is assumed that the pins are
- * configured properly and the bus has been acquired beforehand
- *
- * @notapi
- */
-uint16_t ts_lld_read_value(uint8_t cmd) {
- static uint8_t txbuf[3] = {0};
- static uint8_t rxbuf[3] = {0};
- uint16_t ret;
-
- txbuf[0] = cmd;
-
- spiExchange(tsDriver->spip, 3, txbuf, rxbuf);
-
- ret = (rxbuf[1] << 5) | (rxbuf[2] >> 3);
-
- return ret;
-}
-
-/**
- * @brief 7-point median filtering code for touchscreen samples
- *
- * @note This is an internally used routine only.
- *
- * @notapi
- */
-static void ts_lld_filter(void) {
- uint16_t temp;
- 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];
- sampleBuf[i] = sampleBuf[j];
- sampleBuf[j] = temp;
- }
- }
- }
-}
-
-/**
- * @brief Reads out the X direction.
- *
- * @note The samples are median filtered for greater noise reduction
- *
- * @notapi
- */
-uint16_t ts_lld_read_x(void) {
- int i;
-
-#if defined(SPI_USE_MUTUAL_EXCLUSION)
- spiAcquireBus(tsDriver->spip);
-#endif
-
- TOUCHSCREEN_SPI_PROLOGUE();
- palClearPad(tsDriver->spicfg->ssport, tsDriver->spicfg->sspad);
-
- /* Discard the first conversion - very noisy and keep the ADC on hereafter
- * till we are done with the sampling. Note that PENIRQ is disabled.
- */
- ts_lld_read_value(0xD1);
-
- for(i = 0; i < 7; i++) {
- sampleBuf[i] = ts_lld_read_value(0xD1);
- }
-
- /* Switch on PENIRQ once again - perform a dummy read */
- ts_lld_read_value(0xD0);
-
- palSetPad(tsDriver->spicfg->ssport, tsDriver->spicfg->sspad);
- TOUCHSCREEN_SPI_EPILOGUE();
-
-#if defined(SPI_USE_MUTUAL_EXCLUSION)
- spiReleaseBus(tsDriver->spip);
-#endif
-
- /* Find the median - use selection sort */
- ts_lld_filter();
-
- return sampleBuf[3];
-}
-
-/*
- * @brief Reads out the Y direction.
- *
- * @notapi
- */
-uint16_t ts_lld_read_y(void) {
- int i;
-
-#if defined(SPI_USE_MUTUAL_EXCLUSION)
- spiAcquireBus(tsDriver->spip);
-#endif
-
- TOUCHSCREEN_SPI_PROLOGUE();
- palClearPad(tsDriver->spicfg->ssport, tsDriver->spicfg->sspad);
-
- /* Discard the first conversion - very noisy and keep the ADC on hereafter
- * till we are done with the sampling. Note that PENIRQ is disabled.
- */
- ts_lld_read_value(0x91);
-
- for(i = 0; i < 7; i++) {
- sampleBuf[i] = ts_lld_read_value(0x91);
- }
-
- /* Switch on PENIRQ once again - perform a dummy read */
- ts_lld_read_value(0x90);
-
- palSetPad(tsDriver->spicfg->ssport, tsDriver->spicfg->sspad);
- TOUCHSCREEN_SPI_EPILOGUE();
-
-#ifdef SPI_USE_MUTUAL_EXCLUSION
- spiReleaseBus(tsDriver->spip);
-#endif
-
- /* Find the median - use selection sort */
- ts_lld_filter();
-
- return sampleBuf[3];
-}
-
-/* ---- Optional Routines ---- */
-#if TOUCHSCREEN_HAS_PRESSED || defined(__DOXYGEN__)
- /*
- * @brief for checking if touchscreen is pressed or not.
- *
- * @return 1 if pressed / 0 if not pressed
- *
- * @notapi
- */
- uint8_t ts_lld_pressed(void) {
- return (!palReadPad(tsDriver->tsIRQPort, tsDriver->tsIRQPin));
- }
-#endif
-
-#if TOUCHSCREEN_HAS_PRESSURE || defined(__DOXYGEN__)
- /*
- * @brief Reads out the Z direction / pressure.
- *
- * @notapi
- */
- uint16_t ts_lld_read_z(void) {
- /* ToDo */
- return 42;
- }
-#endif
-
-#endif /* GFX_USE_TOUCHSCREEN */
-/** @} */
-
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