40cd67eee6
Gregory Nutt has submitted the SGA and we can migrate the licenses to Apache. Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
263 lines
8.0 KiB
C
263 lines
8.0 KiB
C
/****************************************************************************
|
|
* boards/arm/sam34/sam3u-ek/src/sam_touchscreen.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <stdbool.h>
|
|
#include <stdio.h>
|
|
#include <debug.h>
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
|
|
#include <nuttx/board.h>
|
|
#include <nuttx/spi/spi.h>
|
|
#include <nuttx/input/touchscreen.h>
|
|
#include <nuttx/input/ads7843e.h>
|
|
|
|
#include "sam_gpio.h"
|
|
#include "sam_spi.h"
|
|
|
|
#include "sam3u-ek.h"
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/* Configuration ************************************************************/
|
|
|
|
#ifdef CONFIG_INPUT_ADS7843E
|
|
#ifndef CONFIG_INPUT
|
|
# error "Touchscreen support requires CONFIG_INPUT"
|
|
#endif
|
|
|
|
#ifndef CONFIG_SAM34_SPI0
|
|
# error "Touchscreen support requires CONFIG_SAM34_SPI0"
|
|
#endif
|
|
|
|
#ifndef CONFIG_SAM34_GPIOA_IRQ
|
|
# error "Touchscreen support requires CONFIG_SAM34_GPIOA_IRQ"
|
|
#endif
|
|
|
|
#ifndef CONFIG_ADS7843E_FREQUENCY
|
|
# define CONFIG_ADS7843E_FREQUENCY 500000
|
|
#endif
|
|
|
|
#ifndef CONFIG_ADS7843E_SPIDEV
|
|
# define CONFIG_ADS7843E_SPIDEV TSC_CSNUM
|
|
#endif
|
|
|
|
#if CONFIG_ADS7843E_SPIDEV != TSC_CSNUM
|
|
# error "CONFIG_ADS7843E_SPIDEV must have the same value as TSC_CSNUM"
|
|
#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 */
|
|
|
|
iinfo("Attaching %p to IRQ %d\n", isr, SAM_TCS_IRQ);
|
|
return irq_attach(SAM_TCS_IRQ, isr, NULL);
|
|
}
|
|
|
|
static void tsc_enable(FAR struct ads7843e_config_s *state, bool enable)
|
|
{
|
|
/* Attach and enable, or detach and disable */
|
|
|
|
iinfo("IRQ:%d enable:%d\n", SAM_TCS_IRQ, enable);
|
|
if (enable)
|
|
{
|
|
sam_gpioirqenable(SAM_TCS_IRQ);
|
|
}
|
|
else
|
|
{
|
|
sam_gpioirqdisable(SAM_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_INFO)
|
|
static bool last = (bool)-1;
|
|
#endif
|
|
|
|
/* BUSY is high impedance when CS is high (not selected). When CS is
|
|
* is low, BUSY is active high.
|
|
*/
|
|
|
|
bool busy = sam_gpioread(GPIO_TCS_BUSY);
|
|
#if defined(CONFIG_DEBUG_INPUT) && defined(CONFIG_DEBUG_INFO)
|
|
if (busy != last)
|
|
{
|
|
iinfo("busy:%d\n", busy);
|
|
last = busy;
|
|
}
|
|
#endif
|
|
|
|
return busy;
|
|
}
|
|
|
|
static bool tsc_pendown(FAR struct ads7843e_config_s *state)
|
|
{
|
|
/* The /PENIRQ value is active low */
|
|
|
|
bool pendown = !sam_gpioread(GPIO_TCS_IRQ);
|
|
iinfo("pendown:%d\n", pendown);
|
|
return pendown;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: sam_tsc_setup
|
|
*
|
|
* Description:
|
|
* This function is called by board-bringup logic to configure the
|
|
* touchscreen device. This function will register the driver as
|
|
* /dev/inputN where N is the minor device number.
|
|
*
|
|
* Input Parameters:
|
|
* minor - The input device minor number
|
|
*
|
|
* Returned Value:
|
|
* Zero is returned on success. Otherwise, a negated errno value is
|
|
* returned to indicate the nature of the failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int sam_tsc_setup(int minor)
|
|
{
|
|
FAR struct spi_dev_s *dev;
|
|
int ret;
|
|
|
|
iinfo("minor %d\n", minor);
|
|
DEBUGASSERT(minor == 0);
|
|
|
|
/* Configure and enable the ADS7843E interrupt pin as an input */
|
|
|
|
sam_configgpio(GPIO_TCS_BUSY);
|
|
sam_configgpio(GPIO_TCS_IRQ);
|
|
|
|
/* Configure the PIO interrupt */
|
|
|
|
sam_gpioirq(GPIO_TCS_IRQ);
|
|
|
|
/* Get an instance of the SPI interface for the touchscreen chip select */
|
|
|
|
dev = sam_spibus_initialize(TSC_CSNUM);
|
|
if (!dev)
|
|
{
|
|
ierr("ERROR: Failed to initialize SPI chip select %d\n", TSC_CSNUM);
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Initialize and register the SPI touschscreen device */
|
|
|
|
ret = ads7843e_register(dev, &g_tscinfo, CONFIG_ADS7843E_DEVMINOR);
|
|
if (ret < 0)
|
|
{
|
|
ierr("ERROR: Failed to initialize SPI chip select %d\n", TSC_CSNUM);
|
|
|
|
/* sam_spibus_uninitialize(dev); */
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
#endif /* CONFIG_INPUT_ADS7843E */
|