273 lines
8.6 KiB
C
273 lines
8.6 KiB
C
/************************************************************************************
|
|
* configs/sam3u-ek/src/up_touchscreen.c
|
|
* arch/arm/src/board/up_touchscreen.c
|
|
*
|
|
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
************************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <stdbool.h>
|
|
#include <stdio.h>
|
|
#include <debug.h>
|
|
#include <errno.h>
|
|
|
|
#include <nuttx/spi.h>
|
|
#include <nuttx/input/touchscreen.h>
|
|
#include <nuttx/input/ads7843e.h>
|
|
|
|
#include "sam3u_internal.h"
|
|
#include "sam3uek_internal.h"
|
|
|
|
/****************************************************************************
|
|
* Pre-Processor Definitions
|
|
****************************************************************************/
|
|
/* Configuration ************************************************************/
|
|
|
|
#ifdef CONFIG_INPUT_ADS7843E
|
|
#ifndef CONFIG_INPUT
|
|
# error "Touchscreen support requires CONFIG_INPUT"
|
|
#endif
|
|
|
|
#ifndef CONFIG_SAM3U_SPI
|
|
# error "Touchscreen support requires CONFIG_SAM3U_SPI"
|
|
#endif
|
|
|
|
#ifndef CONFIG_GPIOA_IRQ
|
|
# error "Touchscreen support requires CONFIG_GPIOA_IRQ"
|
|
#endif
|
|
|
|
#ifndef CONFIG_ADS7843E_FREQUENCY
|
|
# define CONFIG_ADS7843E_FREQUENCY 500000
|
|
#endif
|
|
|
|
#ifndef CONFIG_ADS7843E_SPIDEV
|
|
# define CONFIG_ADS7843E_SPIDEV 0
|
|
#endif
|
|
|
|
#if CONFIG_ADS7843E_SPIDEV != 0
|
|
# error "CONFIG_ADS7843E_SPIDEV must be zero"
|
|
#endif
|
|
|
|
#ifndef CONFIG_ADS7843E_DEVMINOR
|
|
# define CONFIG_ADS7843E_DEVMINOR 0
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Static Function Prototypes
|
|
****************************************************************************/
|
|
|
|
/* IRQ/GPIO access callbacks. These operations all hidden behind
|
|
* callbacks to isolate the ADS7843E driver from differences in GPIO
|
|
* interrupt handling by varying boards and MCUs. If possible,
|
|
* interrupts should be configured on both rising and falling edges
|
|
* so that contact and loss-of-contact events can be detected.
|
|
*
|
|
* attach - Attach the ADS7843E interrupt handler to the GPIO interrupt
|
|
* enable - Enable or disable the GPIO interrupt
|
|
* clear - Acknowledge/clear any pending GPIO interrupt
|
|
* pendown - Return the state of the pen down GPIO input
|
|
*/
|
|
|
|
static int tsc_attach(FAR struct ads7843e_config_s *state, xcpt_t isr);
|
|
static void tsc_enable(FAR struct ads7843e_config_s *state, bool enable);
|
|
static void tsc_clear(FAR struct ads7843e_config_s *state);
|
|
static bool tsc_busy(FAR struct ads7843e_config_s *state);
|
|
static bool tsc_pendown(FAR struct ads7843e_config_s *state);
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
/* A reference to a structure of this type must be passed to the ADS7843E
|
|
* driver. This structure provides information about the configuration
|
|
* of the ADS7843E and provides some board-specific hooks.
|
|
*
|
|
* Memory for this structure is provided by the caller. It is not copied
|
|
* by the driver and is presumed to persist while the driver is active. The
|
|
* memory must be writable because, under certain circumstances, the driver
|
|
* may modify frequency or X plate resistance values.
|
|
*/
|
|
|
|
static struct ads7843e_config_s g_tscinfo =
|
|
{
|
|
.frequency = CONFIG_ADS7843E_FREQUENCY,
|
|
|
|
.attach = tsc_attach,
|
|
.enable = tsc_enable,
|
|
.clear = tsc_clear,
|
|
.busy = tsc_busy,
|
|
.pendown = tsc_pendown,
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/* IRQ/GPIO access callbacks. These operations all hidden behind
|
|
* callbacks to isolate the ADS7843E driver from differences in GPIO
|
|
* interrupt handling by varying boards and MCUs. If possible,
|
|
* interrupts should be configured on both rising and falling edges
|
|
* so that contact and loss-of-contact events can be detected.
|
|
*
|
|
* attach - Attach the ADS7843E interrupt handler to the GPIO interrupt
|
|
* enable - Enable or disable the GPIO interrupt
|
|
* clear - Acknowledge/clear any pending GPIO interrupt
|
|
* pendown - Return the state of the pen down GPIO input
|
|
*/
|
|
|
|
static int tsc_attach(FAR struct ads7843e_config_s *state, xcpt_t isr)
|
|
{
|
|
/* Attach the ADS7843E interrupt */
|
|
|
|
ivdbg("Attaching %p to IRQ %d\n", isr, SAM3U_TCS_IRQ);
|
|
return irq_attach(SAM3U_TCS_IRQ, isr);
|
|
}
|
|
|
|
static void tsc_enable(FAR struct ads7843e_config_s *state, bool enable)
|
|
{
|
|
/* Attach and enable, or detach and disable */
|
|
|
|
ivdbg("IRQ:%d enable:%d\n", SAM3U_TCS_IRQ, enable);
|
|
if (enable)
|
|
{
|
|
sam3u_gpioirqenable(SAM3U_TCS_IRQ);
|
|
}
|
|
else
|
|
{
|
|
sam3u_gpioirqdisable(SAM3U_TCS_IRQ);
|
|
}
|
|
}
|
|
|
|
static void tsc_clear(FAR struct ads7843e_config_s *state)
|
|
{
|
|
/* Does nothing */
|
|
}
|
|
|
|
static bool tsc_busy(FAR struct ads7843e_config_s *state)
|
|
{
|
|
#if defined(CONFIG_DEBUG_INPUT) && defined(CONFIG_DEBUG_VERBOSE)
|
|
static bool last = (bool)-1;
|
|
#endif
|
|
|
|
/* REVISIT: This might need to be inverted */
|
|
|
|
bool busy = sam3u_gpioread(GPIO_TCS_BUSY);
|
|
#if defined(CONFIG_DEBUG_INPUT) && defined(CONFIG_DEBUG_VERBOSE)
|
|
if (busy != last)
|
|
{
|
|
ivdbg("busy:%d\n", busy);
|
|
last = busy;
|
|
}
|
|
#endif
|
|
return busy;
|
|
}
|
|
|
|
static bool tsc_pendown(FAR struct ads7843e_config_s *state)
|
|
{
|
|
/* REVISIT: This might need to be inverted */
|
|
|
|
bool pendown = sam3u_gpioread(GPIO_TCS_IRQ);
|
|
ivdbg("pendown:%d\n", pendown);
|
|
return pendown;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: arch_tcinitialize
|
|
*
|
|
* Description:
|
|
* Initialize the touchscreen device
|
|
*
|
|
****************************************************************************/
|
|
|
|
int arch_tcinitialize(void)
|
|
{
|
|
FAR struct spi_dev_s *dev;
|
|
int ret;
|
|
|
|
ivdbg("Initializing\n");
|
|
|
|
/* Configure and enable the ADS7843E interrupt pin as an input */
|
|
|
|
(void)sam3u_configgpio(GPIO_TCS_BUSY);
|
|
(void)sam3u_configgpio(GPIO_TCS_IRQ);
|
|
|
|
/* Configure the PIO interrupt */
|
|
|
|
sam3u_gpioirq(GPIO_TCS_IRQ);
|
|
|
|
/* Get an instance of the SPI interface */
|
|
|
|
dev = up_spiinitialize(CONFIG_ADS7843E_SPIDEV);
|
|
if (!dev)
|
|
{
|
|
idbg("Failed to initialize SPI bus %d\n", CONFIG_ADS7843E_SPIDEV);
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Initialize and register the SPI touschscreen device */
|
|
|
|
ret = ads7843e_register(dev, &g_tscinfo, CONFIG_ADS7843E_DEVMINOR);
|
|
if (ret < 0)
|
|
{
|
|
idbg("Failed to initialize SPI bus %d\n", CONFIG_ADS7843E_SPIDEV);
|
|
/* up_spiuninitialize(dev); */
|
|
return -ENODEV;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: arch_tcuninitialize
|
|
*
|
|
* Description:
|
|
* Un-initialize the touchscreen device
|
|
*
|
|
****************************************************************************/
|
|
|
|
void arch_tcuninitialize(void)
|
|
{
|
|
/* No support for un-initializing the touchscreen ADS7843E device yet */
|
|
}
|
|
|
|
#endif /* CONFIG_INPUT_ADS7843E */
|
|
|