347 lines
11 KiB
C
347 lines
11 KiB
C
/************************************************************************************
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* configs/open1788/src/lpc17_touchscreen.c
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* arch/arm/src/board/lpc17_touchscreen.c
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*
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* Copyright (C) 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <debug.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/arch.h>
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#include <nuttx/irq.h>
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#include <nuttx/spi/spi.h>
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#include <nuttx/input/touchscreen.h>
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#include <nuttx/input/ads7843e.h>
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#include "lpc17_gpio.h"
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#include "lpc17_ssp.h"
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#include "open1788.h"
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#ifdef CONFIG_INPUT_ADS7843E
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/****************************************************************************
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* Pre-Processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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#ifndef CONFIG_INPUT
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# error "Touchscreen support requires CONFIG_INPUT"
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#endif
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#ifndef CONFIG_LPC17_SSP1
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# error "Touchscreen support requires CONFIG_LPC17_SSP1"
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#endif
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#ifndef CONFIG_GPIO_IRQ
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# error "Touchscreen support requires CONFIG_GPIO_IRQ"
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#endif
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#ifndef CONFIG_ADS7843E_FREQUENCY
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# define CONFIG_ADS7843E_FREQUENCY 500000
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#endif
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#ifndef CONFIG_ADS7843E_SPIDEV
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# define CONFIG_ADS7843E_SPIDEV 1
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#endif
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#if CONFIG_ADS7843E_SPIDEV != 1
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# error "CONFIG_ADS7843E_SPIDEV must be one"
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#endif
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#ifndef CONFIG_ADS7843E_DEVMINOR
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# define CONFIG_ADS7843E_DEVMINOR 0
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#endif
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/* REVISIT: Currently, XPT2046 reports BUSY all of the time. This is
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* probably GPIO setting issues. But there is this cryptic statement in
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* the XPT2046 spec: "No DCLK delay required with dedicated serial port."
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*
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* The busy state is used by the XPT2046 driver to control the delay
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* between sending the command, then reading the returned data.
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*/
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#define XPT2046_NO_BUSY 1
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* IRQ/GPIO access callbacks. These operations all hidden behind
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* callbacks to isolate the XPT2046 driver from differences in GPIO
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* interrupt handling by varying boards and MCUs. If possible,
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* interrupts should be configured on both rising and falling edges
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* so that contact and loss-of-contact events can be detected.
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*
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* attach - Attach the XPT2046 interrupt handler to the GPIO interrupt
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* enable - Enable or disable the GPIO interrupt
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* clear - Acknowledge/clear any pending GPIO interrupt
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* pendown - Return the state of the pen down GPIO input
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*/
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static int tsc_attach(FAR struct ads7843e_config_s *state, xcpt_t isr);
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static void tsc_enable(FAR struct ads7843e_config_s *state, bool enable);
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static void tsc_clear(FAR struct ads7843e_config_s *state);
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static bool tsc_busy(FAR struct ads7843e_config_s *state);
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static bool tsc_pendown(FAR struct ads7843e_config_s *state);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* A reference to a structure of this type must be passed to the XPT2046
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* driver. This structure provides information about the configuration
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* of the XPT2046 and provides some board-specific hooks.
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*
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* Memory for this structure is provided by the caller. It is not copied
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* by the driver and is presumed to persist while the driver is active.
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*/
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static struct ads7843e_config_s g_tscinfo =
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{
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.frequency = CONFIG_ADS7843E_FREQUENCY,
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.attach = tsc_attach,
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.enable = tsc_enable,
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.clear = tsc_clear,
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.busy = tsc_busy,
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.pendown = tsc_pendown,
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/* IRQ/GPIO access callbacks. These operations all hidden behind
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* callbacks to isolate the XPT2046 driver from differences in GPIO
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* interrupt handling by varying boards and MCUs. If possible,
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* interrupts should be configured on both rising and falling edges
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* so that contact and loss-of-contact events can be detected.
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*
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* attach - Attach the XPT2046 interrupt handler to the GPIO interrupt
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* enable - Enable or disable the GPIO interrupt
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* clear - Acknowledge/clear any pending GPIO interrupt
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* pendown - Return the state of the pen down GPIO input
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*/
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static int tsc_attach(FAR struct ads7843e_config_s *state, xcpt_t handler)
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{
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/* Attach then enable the touchscreen interrupt handler */
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(void)irq_attach(LPC17_IRQ_PENIRQ, handler);
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return OK;
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}
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static void tsc_enable(FAR struct ads7843e_config_s *state, bool enable)
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{
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ivdbg("enable:%d\n", enable);
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if (enable)
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{
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/* Enable PENIRQ interrupts. NOTE: The pin interrupt is enabled from worker thread
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* logic after completion of processing of the touchscreen interrupt.
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*/
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up_enable_irq(LPC17_IRQ_PENIRQ);
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}
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else
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{
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/* Disable PENIRQ interrupts. NOTE: The PENIRQ interrupt will be disabled from
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* interrupt handling logic.
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*/
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up_disable_irq(LPC17_IRQ_PENIRQ);
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}
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}
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static void tsc_clear(FAR struct ads7843e_config_s *state)
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{
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/* Does nothing. The interrupt is cleared automatically in the GPIO
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* logic for the LPC17xx family.
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*/
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}
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static bool tsc_busy(FAR struct ads7843e_config_s *state)
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{
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/* The busy state is used by the XPT2046 driver to control the delay
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* between sending the command, then reading the returned data.
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*/
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#ifdef XPT2046_NO_BUSY
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/* REVISIT: Currently, XPT2046 reports BUSY all of the time. This is
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* probably GPIO setting issues. But there is this cryptic statement in
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* the XPT2046 spec: "No DCLK delay required with dedicated serial port."
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*/
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return false;
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#else /* XPT2046_NO_BUSY */
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#if defined(CONFIG_DEBUG_INPUT) && defined(CONFIG_DEBUG_VERBOSE)
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static bool last = (bool)-1;
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#endif
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/* REVISIT: This might need to be inverted */
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bool busy = lpc17_gpioread(GPIO_TC_BUSY);
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#if defined(CONFIG_DEBUG_INPUT) && defined(CONFIG_DEBUG_VERBOSE)
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if (busy != last)
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{
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ivdbg("busy:%d\n", busy);
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last = busy;
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}
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#endif
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return busy;
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#endif /* XPT2046_NO_BUSY */
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}
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static bool tsc_pendown(FAR struct ads7843e_config_s *state)
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{
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/* XPT2046 uses an an internal pullup resistor. The PENIRQ output goes low
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* due to the current path through the touch screen to ground, which
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* initiates an interrupt to the processor via TP_INT.
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*/
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bool pendown = !lpc17_gpioread(GPIO_TC_PENIRQ);
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ivdbg("pendown:%d\n", pendown);
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return pendown;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: arch_tcinitialize
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*
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* Description:
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* Each board that supports a touchscreen device must provide this
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* function. This function is called by application-specific, setup logic
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* to configure the touchscreen device. This function will register the
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* driver as /dev/inputN where N is the minor device number.
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*
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* Input Parameters:
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* minor - The input device minor number
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*
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* Returned Value:
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* Zero is returned on success. Otherwise, a negated errno value is
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* returned to indicate the nature of the failure.
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*
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****************************************************************************/
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int arch_tcinitialize(int minor)
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{
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static bool initialized = false;
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FAR struct spi_dev_s *dev;
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int ret;
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idbg("initialized:%d minor:%d\n", initialized, minor);
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DEBUGASSERT(minor == 0);
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/* Since there is no uninitialized logic, this initialization can be
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* performed only one time.
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*/
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if (!initialized)
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{
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/* Configure and enable the XPT2046 PENIRQ pin as an interrupting input. */
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(void)lpc17_configgpio(GPIO_TC_PENIRQ);
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/* Configure the XPT2046 BUSY pin as a normal input. */
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#ifndef XPT2046_NO_BUSY
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(void)lpc17_configgpio(GPIO_TC_BUSY);
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#endif
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/* Get an instance of the SPI interface */
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dev = lpc17_sspinitialize(CONFIG_ADS7843E_SPIDEV);
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if (!dev)
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{
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idbg("Failed to initialize SPI bus %d\n", CONFIG_ADS7843E_SPIDEV);
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return -ENODEV;
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}
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/* Initialize and register the SPI touchscreen device */
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ret = ads7843e_register(dev, &g_tscinfo, CONFIG_ADS7843E_DEVMINOR);
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if (ret < 0)
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{
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idbg("Failed to register touchscreen device minor=%d\n",
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CONFIG_ADS7843E_DEVMINOR);
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/* up_spiuninitialize(dev); */
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return -ENODEV;
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}
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initialized = true;
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}
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return OK;
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}
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/****************************************************************************
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* Name: arch_tcuninitialize
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*
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* Description:
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* Each board that supports a touchscreen device must provide this function.
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* This function is called by application-specific, setup logic to
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* uninitialize the touchscreen device.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* None.
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*
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****************************************************************************/
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void arch_tcuninitialize(void)
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{
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/* No support for un-initializing the touchscreen XPT2046 device yet */
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}
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#endif /* CONFIG_INPUT_ADS7843E */
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