1409 lines
39 KiB
C
1409 lines
39 KiB
C
/****************************************************************************
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* boards/mips/pic32mx/pic32mx7mmb/src/pic32_touchscreen.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include <poll.h>
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#include <sched.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/board.h>
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#include <nuttx/clock.h>
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#include <nuttx/wqueue.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/input/touchscreen.h>
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#include <nuttx/mutex.h>
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#include <nuttx/semaphore.h>
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#include <arch/board/board.h>
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#include "mips_internal.h"
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#include "pic32mx.h"
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#include "pic32mx_adc.h"
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#include "pic32mx_ioport.h"
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#include "pic32mx7mmb.h"
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#ifdef CONFIG_INPUT
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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/* Reference counting is partially implemented, but not needed in the current
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* design.
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*/
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#undef CONFIG_TOUCHSCREEN_REFCNT
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/* Should we try again on bad samples? */
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#undef CONFIG_TOUCHSCREEN_RESAMPLE
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/* Work queue support is required */
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#ifndef CONFIG_SCHED_WORKQUEUE
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# warning "Work queue support is required (CONFIG_SCHED_WORKQUEUE=y)
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#endif
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/* CONFIG_TOUCHSCREEN_THRESHX and CONFIG_TOUCHSCREEN_THRESHY
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* Touchscreen data comes in a a very high rate. New touch positions
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* will only be reported when the X or Y data changes by these thresholds.
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* This trades reduces data rate for some loss in dragging accuracy. The
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* touchscreen is configure for 10-bit values so the raw ranges are 0-1023.
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* So for example, if your display is 320x240, then THRESHX=3 and THRESHY=4
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* would correspond to one pixel. Default: 4
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*/
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#ifndef CONFIG_TOUCHSCREEN_THRESHX
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# define CONFIG_TOUCHSCREEN_THRESHX 4
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#endif
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#ifndef CONFIG_TOUCHSCREEN_THRESHY
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# define CONFIG_TOUCHSCREEN_THRESHY 4
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#endif
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/* Driver support ***********************************************************/
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/* This format is used to construct the /dev/input[n] device driver path.
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* It is defined here so that it will be used consistently in all places.
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*/
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#define DEV_FORMAT "/dev/input%d"
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#define DEV_NAMELEN 16
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/* PIC32MX7MMB Touchscreen Hardware Definitions *****************************/
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/* ----- ------ --------------------
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* GPIO ADC IN TFT Signal Name
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* ----- ------ --------------------
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* RB10 AN10 LCD-YD
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* RB11 AN11 LCD-XR
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* RB12 AN12 LCD-YU
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* RB13 AN13 LCD-XL
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*/
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#define LCD_XPLUS_PIN (11)
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#define LCD_YPLUS_PIN (12)
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#define LCD_XMINUS_PIN (13)
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#define LCD_YMINUS_PIN (10)
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#define LCD_XPLUS_BIT (1 << LCD_XPLUS_PIN)
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#define LCD_YPLUS_BIT (1 << LCD_YPLUS_PIN)
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#define LCD_XMINUS_BIT (1 << LCD_XMINUS_PIN)
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#define LCD_YMINUS_BIT (1 << LCD_YMINUS_PIN)
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#define LCD_ALL_BITS (LCD_XPLUS_BIT | LCD_YPLUS_BIT | LCD_XMINUS_BIT | LCD_YMINUS_BIT)
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/* Conversions are performed as 10-bit samples represented as 16-bit
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* unsigned integers:
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*/
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#define MAX_ADC (1023)
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/* A measured value has to be within this range to be considered */
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#define UPPER_THRESHOLD (MAX_ADC-1)
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#define LOWER_THRESHOLD (1)
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/* Delays *******************************************************************/
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/* All values will be increased by one system timer tick (probably 10MS). */
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#define TC_PENUP_POLL_TICKS MSEC2TICK(100) /* IDLE polling rate: 100 MSec */
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#define TC_PENDOWN_POLL_TICKS MSEC2TICK(60) /* Active polling rate: 60 MSec */
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#define TC_DEBOUNCE_TICKS MSEC2TICK(30) /* Delay before re-sampling: 30 MSec */
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#define TC_SAMPLE_TICKS MSEC2TICK(4) /* Delay for A/D sampling: 4 MSec */
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#define TC_RESAMPLE_TICKS TC_SAMPLE_TICKS
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* This enumeration describes the state of touchscreen state machine */
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enum tc_state_e
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{
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TC_READY = 0, /* Ready to begin next sample */
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TC_YMPENDOWN, /* Allowing time for the Y- pen down sampling */
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TC_DEBOUNCE, /* Allowing a debounce time for the first sample */
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TC_RESAMPLE, /* Restart sampling on a bad measurement */
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TC_YMSAMPLE, /* Allowing time for the Y- sampling */
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TC_YPSAMPLE, /* Allowing time for the Y+ sampling */
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TC_XPSAMPLE, /* Allowing time for the X+ sampling */
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TC_XMSAMPLE, /* Allowing time for the X- sampling */
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TC_PENDOWN, /* Conversion is complete -- pen down */
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TC_PENUP /* Conversion is complete -- pen up */
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};
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/* This describes the state of one contact */
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enum tc_contact_e
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{
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CONTACT_NONE = 0, /* No contact */
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CONTACT_DOWN, /* First contact */
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CONTACT_MOVE, /* Same contact, possibly different position */
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CONTACT_UP, /* Contact lost */
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};
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/* This structure describes the results of one touchscreen sample */
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struct tc_sample_s
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{
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uint8_t id; /* Sampled touch point ID */
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uint8_t contact; /* Contact state (see enum tc_contact_e) */
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bool valid; /* True: x,y contain valid, sampled data */
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uint16_t x; /* Thresholded X position */
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uint16_t y; /* Thresholded Y position */
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};
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/* This structure describes the state of one touchscreen driver instance */
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struct tc_dev_s
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{
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#ifdef CONFIG_TOUCHSCREEN_REFCNT
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uint8_t crefs; /* Number of times the device has been opened */
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#endif
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uint8_t state; /* See enum tc_state_e */
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uint8_t nwaiters; /* Number of threads waiting for touchscreen data */
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uint8_t id; /* Current touch point ID */
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volatile bool penchange; /* An unreported event is buffered */
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uint16_t value; /* Partial sample value (Y+ or X-) */
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uint16_t newy; /* New, un-thresholded Y value */
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mutex_t devlock; /* Manages exclusive access to this structure */
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sem_t waitsem; /* Used to wait for the availability of data */
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struct tc_sample_s sample; /* Last sampled touch point data */
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struct work_s work; /* Supports the state machine delayed processing */
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/* The following is a list if poll structures of threads waiting for
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* driver events. The 'struct pollfd' reference for each open is also
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* retained in the f_priv field of the 'struct file'.
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*/
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struct pollfd *fds[CONFIG_TOUCHSCREEN_NPOLLWAITERS];
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static void tc_adc_sample(int pin);
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static uint16_t tc_adc_convert(void);
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static void tc_yminus_sample(void);
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static void tc_yplus_sample(void);
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static void tc_xplus_sample(void);
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static void tc_xminus_sample(void);
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static inline bool tc_valid_sample(uint16_t sample);
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static void tc_notify(struct tc_dev_s *priv);
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static int tc_sample(struct tc_dev_s *priv,
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struct tc_sample_s *sample);
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static int tc_waitsample(struct tc_dev_s *priv,
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struct tc_sample_s *sample);
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static void tc_worker(void *arg);
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/* Character driver methods */
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static int tc_open(struct file *filep);
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static int tc_close(struct file *filep);
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static ssize_t tc_read(struct file *filep, char *buffer, size_t len);
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static int tc_ioctl(struct file *filep, int cmd, unsigned long arg);
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static int tc_poll(struct file *filep, struct pollfd *fds, bool setup);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* This the vtable that supports the character driver interface */
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static const struct file_operations g_tc_fops =
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{
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tc_open, /* open */
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tc_close, /* close */
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tc_read, /* read */
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NULL, /* write */
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NULL, /* seek */
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tc_ioctl, /* ioctl */
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NULL, /* mmap */
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NULL, /* truncate */
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tc_poll /* poll */
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};
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/* If only a single touchscreen device is supported, then the driver state
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* structure may as well be pre-allocated.
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*/
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#ifndef CONFIG_TOUCHSCREEN_MULTIPLE
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static struct tc_dev_s g_touchscreen;
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: tc_adc_sample
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*
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* Description:
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* Perform A/D sampling.
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* Time must be allowed between the start of sampling
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* and conversion (approx. 100Ms).
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*
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****************************************************************************/
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static void tc_adc_sample(int pin)
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{
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/* Configure the pins for as an analog input. AD1PCFG specifies the
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* configuration of device pins to be used as analog inputs. A pin
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* is configured as an analog input when the corresponding PCFGn bit
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* is 0.
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*/
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putreg32(ADC_CFG(pin), PIC32MX_ADC_CFGCLR);
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/* Set SAMP=0, format 16-bit unsigned integer, manual conversion,
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* SAMP=1 will trigger.
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*/
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putreg32(0, PIC32MX_ADC_CON1);
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/* Select the pin as the MUXA CH0 input (positive) */
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putreg32(ADC_CHS_CH0SA(pin), PIC32MX_ADC_CHS);
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/* No input scan */
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putreg32(0, PIC32MX_ADC_CSSL);
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/* Manual sample, TAD = internal, 6 TPB */
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putreg32(ADC_CON3_ADCS(6) | ADC_CON3_SAMC(0), PIC32MX_ADC_CON3);
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/* No interrupts, no scan, internal voltage reference */
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putreg32(ADC_CON2_VCFG_AVDDAVSS, PIC32MX_ADC_CON2);
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/* Turn on the ADC */
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putreg32(ADC_CON1_ON, PIC32MX_ADC_CON1SET);
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/* Start sampling */
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putreg32(ADC_CON1_SAMP, PIC32MX_ADC_CON1SET);
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}
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/****************************************************************************
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* Name: tc_adc_convert
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*
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* Description:
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* Begin A/D conversion.
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* Time must be allowed between the start of sampling
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* and conversion (approx. 100Ms).
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*
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* Assumptions:
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* 1) All output pins configured as outputs:
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* 2) Appropriate pins are driven high and low
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*
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****************************************************************************/
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static uint16_t tc_adc_convert(void)
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{
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uint32_t retval;
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/* Start conversion */
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putreg32(ADC_CON1_SAMP, PIC32MX_ADC_CON1CLR);
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/* Wait for the conversion to complete */
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while ((getreg32(PIC32MX_ADC_CON1) & ADC_CON1_DONE) == 0);
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/* Then read the converted ADC value */
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retval = getreg32(PIC32MX_ADC_BUF0);
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/* Disable the ADC */
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putreg32(ADC_CON1_ON, PIC32MX_ADC_CON1CLR);
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/* Reset all pins to digital function */
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putreg32(LCD_ALL_BITS, PIC32MX_ADC_CFGSET);
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return (uint16_t)retval;
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}
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/****************************************************************************
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* Name: tc_yminus_sample
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*
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* Description:
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* Initiate sampling on Y-
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*
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****************************************************************************/
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static void tc_yminus_sample(void)
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{
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/* Configure X- as an input and X+, Y+, and Y- as outputs */
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putreg32(LCD_XPLUS_BIT | LCD_YPLUS_BIT | LCD_YMINUS_BIT,
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PIC32MX_IOPORTB_TRISCLR);
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putreg32(LCD_XMINUS_BIT, PIC32MX_IOPORTB_TRISSET);
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/* Energize the X plate: Y+ and Y- high, X+ low */
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putreg32(LCD_XPLUS_BIT, PIC32MX_IOPORTB_PORTCLR);
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putreg32(LCD_YPLUS_BIT | LCD_YMINUS_BIT, PIC32MX_IOPORTB_PORTSET);
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/* Start the Y axis sampling */
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tc_adc_sample(LCD_XMINUS_PIN);
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}
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/****************************************************************************
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* Name: tc_yplus_sample
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*
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* Description:
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* Initiate sampling on Y+
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*
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****************************************************************************/
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static void tc_yplus_sample(void)
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{
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/* Configure X+ as an input and X-, Y+, and Y- as outputs */
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putreg32(LCD_XMINUS_BIT | LCD_YPLUS_BIT | LCD_YMINUS_BIT,
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PIC32MX_IOPORTB_TRISCLR);
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putreg32(LCD_XPLUS_BIT, PIC32MX_IOPORTB_TRISSET);
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/* Energize the X plate: Y+ and Y- High, X- low (X+ is an input) */
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putreg32(LCD_XMINUS_BIT, PIC32MX_IOPORTB_PORTCLR);
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putreg32(LCD_YPLUS_BIT | LCD_YMINUS_BIT, PIC32MX_IOPORTB_PORTSET);
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/* Start the Y axis sampling */
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tc_adc_sample(LCD_XPLUS_PIN);
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}
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/****************************************************************************
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* Name: tc_xplus_sample
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*
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* Description:
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* Initiate sampling on X+
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*
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****************************************************************************/
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static void tc_xplus_sample(void)
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{
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/* Configure Y+ as an input and X+, X-, and Y- as outputs */
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putreg32(LCD_XPLUS_BIT | LCD_XMINUS_BIT | LCD_YMINUS_BIT,
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PIC32MX_IOPORTB_TRISCLR);
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putreg32(LCD_YPLUS_BIT, PIC32MX_IOPORTB_TRISSET);
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/* Energize the Y plate: X+ and X- high, Y- low (Y+ is an input) */
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putreg32(LCD_YMINUS_BIT, PIC32MX_IOPORTB_PORTCLR);
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putreg32(LCD_XPLUS_BIT | LCD_XMINUS_BIT, PIC32MX_IOPORTB_PORTSET);
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/* Read the X axis value */
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tc_adc_sample(LCD_YPLUS_PIN);
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}
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/****************************************************************************
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* Name: tc_xminus_sample
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*
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* Description:
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* Initiate sampling on X-
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*
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****************************************************************************/
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static void tc_xminus_sample(void)
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{
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/* Configure Y- as an input and X+, Y+, and X- as outputs */
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putreg32(LCD_XPLUS_BIT | LCD_XMINUS_BIT | LCD_YPLUS_BIT,
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PIC32MX_IOPORTB_TRISCLR);
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putreg32(LCD_YMINUS_BIT, PIC32MX_IOPORTB_TRISSET);
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/* Energize the Y plate: X+ and X- high, Y+ low (Y- is an input) */
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putreg32(LCD_YPLUS_BIT, PIC32MX_IOPORTB_PORTCLR);
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putreg32(LCD_XPLUS_BIT | LCD_XMINUS_BIT, PIC32MX_IOPORTB_PORTSET);
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/* Start X axis sampling */
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tc_adc_sample(LCD_YMINUS_PIN);
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}
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/****************************************************************************
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* Name: tc_valid_sample
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****************************************************************************/
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static inline bool tc_valid_sample(uint16_t sample)
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{
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return (sample > LOWER_THRESHOLD /* && sample < UPPER_THRESHOLD */);
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}
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/****************************************************************************
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* Name: tc_notify
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****************************************************************************/
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static void tc_notify(struct tc_dev_s *priv)
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{
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/* If there are threads waiting on poll() for touchscreen data to become
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* available, then wake them up now. NOTE: we wake up all waiting threads
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* because we do not know that they are going to do.
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* If they all try to read the data, then some make end up blocking after
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* all.
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*/
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poll_notify(priv->fds, CONFIG_TOUCHSCREEN_NPOLLWAITERS, POLLIN);
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/* If there are threads waiting for read data, then signal one of them
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* that the read data is available.
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*/
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if (priv->nwaiters > 0)
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{
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/* After posting this semaphore, we need to exit because the
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* touchscreen is no longer available.
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*/
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nxsem_post(&priv->waitsem);
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}
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}
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/****************************************************************************
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* Name: tc_sample
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*
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* Assumptions: pre-emption is disabled
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*
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****************************************************************************/
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static int tc_sample(struct tc_dev_s *priv,
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struct tc_sample_s *sample)
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{
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int ret = -EAGAIN;
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|
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/* Is there new touchscreen sample data available? */
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if (priv->penchange)
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{
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/* Yes.. the state has changed in some way. Return a copy of the
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|
* sampled data.
|
|
*/
|
|
|
|
memcpy(sample, &priv->sample, sizeof(struct tc_sample_s));
|
|
|
|
/* Now manage state transitions */
|
|
|
|
if (sample->contact == CONTACT_UP)
|
|
{
|
|
/* Next.. no contact. Increment the ID so that next contact ID
|
|
* will be unique. X/Y positions are no longer valid.
|
|
*/
|
|
|
|
priv->sample.contact = CONTACT_NONE;
|
|
priv->sample.valid = false;
|
|
priv->id++;
|
|
}
|
|
else if (sample->contact == CONTACT_DOWN)
|
|
{
|
|
/* First report -- next report will be a movement */
|
|
|
|
priv->sample.contact = CONTACT_MOVE;
|
|
}
|
|
|
|
priv->penchange = false;
|
|
ret = OK;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: tc_waitsample
|
|
****************************************************************************/
|
|
|
|
static int tc_waitsample(struct tc_dev_s *priv,
|
|
struct tc_sample_s *sample)
|
|
{
|
|
int ret;
|
|
|
|
/* Pre-emption must be disabled when this is called to prevent sampled
|
|
* data from changing until it has been reported.
|
|
*/
|
|
|
|
sched_lock();
|
|
|
|
/* Now release the mutex that manages mutually exclusive access to
|
|
* the device structure. This may cause other tasks to become ready to
|
|
* run, but they cannot run yet because pre-emption is disabled.
|
|
*/
|
|
|
|
nxmutex_unlock(&priv->devlock);
|
|
|
|
/* Try to get the a sample... if we cannot, then wait on the semaphore
|
|
* that is posted when new sample data is available.
|
|
*/
|
|
|
|
while (tc_sample(priv, sample) < 0)
|
|
{
|
|
/* Wait for a change in the touchscreen state */
|
|
|
|
priv->nwaiters++;
|
|
ret = nxsem_wait(&priv->waitsem);
|
|
priv->nwaiters--;
|
|
|
|
if (ret < 0)
|
|
{
|
|
goto errout;
|
|
}
|
|
}
|
|
|
|
/* Re-acquire the mutex that manages mutually exclusive access to
|
|
* the device structure. We may have to wait here. But we have our sample.
|
|
* Interrupts and pre-emption will be re-enabled while we wait.
|
|
*/
|
|
|
|
ret = nxmutex_lock(&priv->devlock);
|
|
|
|
errout:
|
|
/* Restore pre-emption. We might get suspended here but that is okay
|
|
* because we already have our sample. Note: this means that if there
|
|
* were two threads reading from the touchscreen for some reason, the data
|
|
* might be read out of order.
|
|
*/
|
|
|
|
sched_unlock();
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: tc_worker
|
|
****************************************************************************/
|
|
|
|
static void tc_worker(void *arg)
|
|
{
|
|
struct tc_dev_s *priv = (struct tc_dev_s *)arg;
|
|
uint32_t delay;
|
|
uint16_t value;
|
|
uint16_t newx;
|
|
int16_t xdiff;
|
|
int16_t ydiff;
|
|
int ret;
|
|
|
|
DEBUGASSERT(priv != NULL);
|
|
|
|
/* Perform the next action based on the state of the conversions */
|
|
|
|
switch (priv->state)
|
|
{
|
|
/* The touchscreen is IDLE and we are ready to begin the next sample */
|
|
|
|
case TC_READY:
|
|
{
|
|
/* Start Y- sampling */
|
|
|
|
tc_yminus_sample();
|
|
|
|
/* Allow time for the Y- pend down sampling */
|
|
|
|
priv->state = TC_YMPENDOWN;
|
|
delay = TC_SAMPLE_TICKS;
|
|
}
|
|
break;
|
|
|
|
/* The Y- sampling time has elapsed and the Y- value should be ready
|
|
* for conversion
|
|
*/
|
|
|
|
case TC_YMPENDOWN:
|
|
{
|
|
/* Convert the Y- sample value */
|
|
|
|
value = tc_adc_convert();
|
|
|
|
/* A converted value at the minimum would mean that there is no touch
|
|
* and that the sampling period is complete.
|
|
*/
|
|
|
|
if (!tc_valid_sample(value))
|
|
{
|
|
priv->state = TC_PENUP;
|
|
}
|
|
else
|
|
{
|
|
/* Allow time for touch inputs to stabilize */
|
|
|
|
priv->state = TC_DEBOUNCE;
|
|
delay = TC_DEBOUNCE_TICKS;
|
|
}
|
|
}
|
|
break;
|
|
|
|
/* The debounce time period has elapsed and we are ready to re-sample
|
|
* the touchscreen.
|
|
*/
|
|
|
|
case TC_RESAMPLE:
|
|
case TC_DEBOUNCE:
|
|
{
|
|
/* (Re-)start Y- sampling */
|
|
|
|
tc_yminus_sample();
|
|
|
|
/* Allow time for the Y- sampling */
|
|
|
|
priv->state = TC_YMSAMPLE;
|
|
delay = TC_SAMPLE_TICKS;
|
|
}
|
|
break;
|
|
|
|
/* The Y- sampling period has elapsed and we are ready to perform the
|
|
* conversion.
|
|
*/
|
|
|
|
case TC_YMSAMPLE:
|
|
{
|
|
/* Convert and save the Y- sample value */
|
|
|
|
value = tc_adc_convert();
|
|
|
|
/* A converted value at the minimum would mean that there is no touch
|
|
* and that the sampling period is complete. At converted value at
|
|
* the maximum value is probably bad too.
|
|
*/
|
|
|
|
if (!tc_valid_sample(value))
|
|
{
|
|
priv->state = TC_PENUP;
|
|
}
|
|
else
|
|
{
|
|
/* Save the Y- sample and start Y+ sampling */
|
|
|
|
priv->value = value;
|
|
tc_yplus_sample();
|
|
|
|
/* Allow time for the Y+ sampling */
|
|
|
|
priv->state = TC_YPSAMPLE;
|
|
delay = TC_SAMPLE_TICKS;
|
|
}
|
|
}
|
|
break;
|
|
|
|
/* The Y+ sampling period has elapsed and we are ready to perform the
|
|
* conversion.
|
|
*/
|
|
|
|
case TC_YPSAMPLE: /* Allowing time for the Y+ sampling */
|
|
{
|
|
/* Read the Y+ axis position */
|
|
|
|
value = tc_adc_convert();
|
|
|
|
/* A converted value at the minimum would mean that we lost the
|
|
* contact before all of the conversions were completed.
|
|
* At converted value at the maximum value is probably bad too.
|
|
*/
|
|
|
|
if (!tc_valid_sample(value))
|
|
{
|
|
#ifdef CONFIG_TOUCHSCREEN_RESAMPLE
|
|
priv->state = TC_RESAMPLE;
|
|
delay = TC_RESAMPLE_TICKS;
|
|
#else
|
|
priv->state = TC_PENUP;
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
value = MAX_ADC - value;
|
|
priv->newy = (value + priv->value) >> 1;
|
|
iinfo("Y-=%d Y+=%d[%d] Y=%d\n", priv->value,
|
|
value, MAX_ADC - value, priv->newy);
|
|
|
|
/* Start X+ sampling */
|
|
|
|
tc_xplus_sample();
|
|
|
|
/* Allow time for the X+ sampling */
|
|
|
|
priv->state = TC_XPSAMPLE;
|
|
delay = TC_SAMPLE_TICKS;
|
|
}
|
|
}
|
|
break;
|
|
|
|
/* The X+ sampling period has elapsed and we are ready to perform the
|
|
* conversion.
|
|
*/
|
|
|
|
case TC_XPSAMPLE:
|
|
{
|
|
/* Convert the X+ sample value */
|
|
|
|
value = tc_adc_convert();
|
|
|
|
/* A converted value at the minimum would mean that we lost the
|
|
* contact before all of the conversions were completed.
|
|
* At converted value at the maximum value is probably bad too.
|
|
*/
|
|
|
|
if (!tc_valid_sample(value))
|
|
{
|
|
#ifdef CONFIG_TOUCHSCREEN_RESAMPLE
|
|
priv->state = TC_RESAMPLE;
|
|
delay = TC_RESAMPLE_TICKS;
|
|
#else
|
|
priv->state = TC_PENUP;
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
/* Save the X+ sample value */
|
|
|
|
priv->value = value;
|
|
|
|
/* Start X- sampling */
|
|
|
|
tc_xminus_sample();
|
|
|
|
/* Allow time for the X- pend down sampling */
|
|
|
|
priv->state = TC_XMSAMPLE;
|
|
delay = TC_SAMPLE_TICKS;
|
|
}
|
|
}
|
|
break;
|
|
|
|
/* The X+ sampling period has elapsed and we are ready to perform the
|
|
* conversion.
|
|
*/
|
|
|
|
case TC_XMSAMPLE: /* Allowing time for the X- sampling */
|
|
{
|
|
/* Read the converted X- axis position */
|
|
|
|
value = tc_adc_convert();
|
|
|
|
/* A converted value at the minimum would mean that we lost the
|
|
* contact before all of the conversions were completed.
|
|
* At converted value at the maximum value is probably bad too.
|
|
*/
|
|
|
|
if (!tc_valid_sample(value))
|
|
{
|
|
#ifdef CONFIG_TOUCHSCREEN_RESAMPLE
|
|
priv->state = TC_RESAMPLE;
|
|
delay = TC_RESAMPLE_TICKS;
|
|
#else
|
|
priv->state = TC_PENUP;
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
/* Calculate the X- axis position */
|
|
|
|
value = MAX_ADC - value;
|
|
newx = (value + priv->value) >> 1;
|
|
iinfo("X+=%d X-=%d[%d] X=%d\n", priv->value,
|
|
value, MAX_ADC - value, newx);
|
|
|
|
/* Samples are available */
|
|
|
|
priv->state = TC_PENDOWN;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* Check for terminal conditions.. */
|
|
|
|
/* Check if the sampling resulted in a pen up decision. If so, we need to
|
|
* handle the change from pen down to pen up.
|
|
*/
|
|
|
|
if (priv->state == TC_PENUP)
|
|
{
|
|
/* Ignore if the pen was already down (CONTACT_NONE == pen up and
|
|
* already reported. CONTACT_UP == pen up, but not reported)
|
|
*/
|
|
|
|
if (priv->sample.contact != CONTACT_NONE)
|
|
{
|
|
/* The pen is up. We know from the above test, that this is a
|
|
* loss of contact condition. This will be changed to CONTACT_NONE
|
|
* after the loss of contact is sampled.
|
|
*/
|
|
|
|
priv->sample.contact = CONTACT_UP;
|
|
|
|
/* Indicate the availability of new sample data for this ID */
|
|
|
|
priv->sample.id = priv->id;
|
|
priv->penchange = true;
|
|
|
|
/* Notify any waiters that nes touchscreen data is available */
|
|
|
|
tc_notify(priv);
|
|
}
|
|
|
|
/* Set up for the next poll */
|
|
|
|
priv->sample.valid = false;
|
|
priv->state = TC_READY;
|
|
delay = TC_PENUP_POLL_TICKS;
|
|
}
|
|
|
|
/* Check if the sampling resulted in a pen down decision. */
|
|
|
|
else if (priv->state == TC_PENDOWN)
|
|
{
|
|
/* It is a pen down event. If the last loss-of-contact event has not
|
|
* been processed yet, then we have to ignore the pen down event
|
|
* (or else it will look like a drag event)
|
|
*/
|
|
|
|
if (priv->sample.contact != CONTACT_UP)
|
|
{
|
|
/* Perform a thresholding operation so that the results will be
|
|
* more stable.
|
|
* If the difference from the last sample is small, then ignore
|
|
* the event.
|
|
*/
|
|
|
|
xdiff = (int16_t)priv->sample.x - (int16_t)newx;
|
|
if (xdiff < 0)
|
|
{
|
|
xdiff = -xdiff;
|
|
}
|
|
|
|
ydiff = (int16_t)priv->sample.y - (int16_t)priv->newy;
|
|
if (ydiff < 0)
|
|
{
|
|
ydiff = -ydiff;
|
|
}
|
|
|
|
if (xdiff >= CONFIG_TOUCHSCREEN_THRESHX ||
|
|
ydiff >= CONFIG_TOUCHSCREEN_THRESHY)
|
|
{
|
|
/* There is some change above the threshold...
|
|
* Report the change.
|
|
*/
|
|
|
|
priv->sample.x = newx;
|
|
priv->sample.y = priv->newy;
|
|
priv->sample.valid = true;
|
|
|
|
/* If this is the first (acknowledged) penddown report, then
|
|
* report this as the first contact.
|
|
* If contact == CONTACT_DOWN, it will be set to set to
|
|
* CONTACT_MOVE after the contact is first sampled.
|
|
*/
|
|
|
|
if (priv->sample.contact != CONTACT_MOVE)
|
|
{
|
|
/* First contact */
|
|
|
|
priv->sample.contact = CONTACT_DOWN;
|
|
}
|
|
|
|
/* Indicate the availability of new sample data for this ID */
|
|
|
|
priv->sample.id = priv->id;
|
|
priv->penchange = true;
|
|
|
|
/* Notify any waiters that nes touchscreen data is available */
|
|
|
|
tc_notify(priv);
|
|
}
|
|
}
|
|
|
|
/* Set up for the next poll */
|
|
|
|
priv->state = TC_READY;
|
|
delay = TC_PENDOWN_POLL_TICKS;
|
|
}
|
|
|
|
/* Set up the next sample event */
|
|
|
|
ret = work_queue(HPWORK, &priv->work, tc_worker, priv, delay);
|
|
DEBUGASSERT(ret == 0);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: tc_open
|
|
****************************************************************************/
|
|
|
|
static int tc_open(struct file *filep)
|
|
{
|
|
#ifdef CONFIG_TOUCHSCREEN_REFCNT
|
|
struct inode *inode;
|
|
struct tc_dev_s *priv;
|
|
uint8_t tmp;
|
|
int ret;
|
|
|
|
DEBUGASSERT(filep);
|
|
inode = filep->f_inode;
|
|
|
|
DEBUGASSERT(inode && inode->i_private);
|
|
priv = (struct tc_dev_s *)inode->i_private;
|
|
|
|
/* Get exclusive access to the driver data structure */
|
|
|
|
ret = nxmutex_lock(&priv->devlock);
|
|
if (ret < 0)
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
/* Increment the reference count */
|
|
|
|
tmp = priv->crefs + 1;
|
|
if (tmp == 0)
|
|
{
|
|
/* More than 255 opens; uint8_t overflows to zero */
|
|
|
|
ret = -EMFILE;
|
|
goto errout_with_lock;
|
|
}
|
|
|
|
/* When the reference increments to 1, this is the first open event
|
|
* on the driver.. and an opportunity to do any one-time initialization.
|
|
*/
|
|
|
|
/* Save the new open count on success */
|
|
|
|
priv->crefs = tmp;
|
|
|
|
errout_with_lock:
|
|
nxmutex_unlock(&priv->devlock);
|
|
return ret;
|
|
#else
|
|
return OK;
|
|
#endif
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: tc_close
|
|
****************************************************************************/
|
|
|
|
static int tc_close(struct file *filep)
|
|
{
|
|
#ifdef CONFIG_TOUCHSCREEN_REFCNT
|
|
struct inode *inode;
|
|
struct tc_dev_s *priv;
|
|
int ret;
|
|
|
|
DEBUGASSERT(filep);
|
|
inode = filep->f_inode;
|
|
|
|
DEBUGASSERT(inode && inode->i_private);
|
|
priv = (struct tc_dev_s *)inode->i_private;
|
|
|
|
/* Get exclusive access to the driver data structure */
|
|
|
|
ret = nxmutex_lock(&priv->devlock);
|
|
if (ret < 0)
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
/* Decrement the reference count unless it would decrement a negative
|
|
* value. When the count decrements to zero, there are no further
|
|
* open references to the driver.
|
|
*/
|
|
|
|
if (priv->crefs >= 1)
|
|
{
|
|
priv->crefs--;
|
|
}
|
|
|
|
nxmutex_unlock(&priv->devlock);
|
|
#endif
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: tc_read
|
|
****************************************************************************/
|
|
|
|
static ssize_t tc_read(struct file *filep, char *buffer, size_t len)
|
|
{
|
|
struct inode *inode;
|
|
struct tc_dev_s *priv;
|
|
struct touch_sample_s *report;
|
|
struct tc_sample_s sample;
|
|
int ret;
|
|
|
|
DEBUGASSERT(filep);
|
|
inode = filep->f_inode;
|
|
|
|
DEBUGASSERT(inode && inode->i_private);
|
|
priv = (struct tc_dev_s *)inode->i_private;
|
|
|
|
/* Verify that the caller has provided a buffer large enough to receive
|
|
* the touch data.
|
|
*/
|
|
|
|
if (len < SIZEOF_TOUCH_SAMPLE_S(1))
|
|
{
|
|
/* We could provide logic to break up a touch report into segments and
|
|
* handle smaller reads... but why?
|
|
*/
|
|
|
|
return -ENOSYS;
|
|
}
|
|
|
|
/* Get exclusive access to the driver data structure */
|
|
|
|
ret = nxmutex_lock(&priv->devlock);
|
|
if (ret < 0)
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
/* Try to read sample data. */
|
|
|
|
ret = tc_sample(priv, &sample);
|
|
if (ret < 0)
|
|
{
|
|
/* Sample data is not available now. We would ave to wait to get
|
|
* receive sample data. If the user has specified the O_NONBLOCK
|
|
* option, then just return an error.
|
|
*/
|
|
|
|
if (filep->f_oflags & O_NONBLOCK)
|
|
{
|
|
ret = -EAGAIN;
|
|
goto errout;
|
|
}
|
|
|
|
/* Wait for sample data */
|
|
|
|
ret = tc_waitsample(priv, &sample);
|
|
if (ret < 0)
|
|
{
|
|
/* We might have been awakened by a signal */
|
|
|
|
goto errout;
|
|
}
|
|
}
|
|
|
|
/* In any event, we now have sampled touchscreen data that we can report
|
|
* to the caller.
|
|
*/
|
|
|
|
report = (struct touch_sample_s *)buffer;
|
|
memset(report, 0, SIZEOF_TOUCH_SAMPLE_S(1));
|
|
report->npoints = 1;
|
|
report->point[0].id = sample.id;
|
|
report->point[0].x = sample.x;
|
|
report->point[0].y = sample.y;
|
|
|
|
/* Report the appropriate flags */
|
|
|
|
if (sample.contact == CONTACT_UP)
|
|
{
|
|
/* Pen is now up. Is the positional data valid? This is important to
|
|
* know because the release will be sent to the window based on its
|
|
* last positional data.
|
|
*/
|
|
|
|
if (sample.valid)
|
|
{
|
|
report->point[0].flags = TOUCH_UP | TOUCH_ID_VALID |
|
|
TOUCH_POS_VALID | TOUCH_PRESSURE_VALID;
|
|
}
|
|
else
|
|
{
|
|
report->point[0].flags = TOUCH_UP | TOUCH_ID_VALID;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (sample.contact == CONTACT_DOWN)
|
|
{
|
|
/* First contact */
|
|
|
|
report->point[0].flags = TOUCH_DOWN | TOUCH_ID_VALID |
|
|
TOUCH_POS_VALID;
|
|
}
|
|
else /* if (sample->contact == CONTACT_MOVE) */
|
|
{
|
|
/* Movement of the same contact */
|
|
|
|
report->point[0].flags = TOUCH_MOVE | TOUCH_ID_VALID |
|
|
TOUCH_POS_VALID;
|
|
}
|
|
}
|
|
|
|
ret = SIZEOF_TOUCH_SAMPLE_S(1);
|
|
|
|
errout:
|
|
nxmutex_unlock(&priv->devlock);
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: tc_ioctl
|
|
****************************************************************************/
|
|
|
|
static int tc_ioctl(struct file *filep, int cmd, unsigned long arg)
|
|
{
|
|
#if 1
|
|
iinfo("cmd: %d arg: %ld\n", cmd, arg);
|
|
return -ENOTTY; /* None yet supported */
|
|
#else
|
|
struct inode *inode;
|
|
struct tc_dev_s *priv;
|
|
int ret;
|
|
|
|
iinfo("cmd: %d arg: %ld\n", cmd, arg);
|
|
DEBUGASSERT(filep);
|
|
inode = filep->f_inode;
|
|
|
|
DEBUGASSERT(inode && inode->i_private);
|
|
priv = (struct tc_dev_s *)inode->i_private;
|
|
|
|
/* Get exclusive access to the driver data structure */
|
|
|
|
ret = nxmutex_lock(&priv->devlock);
|
|
if (ret < 0)
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
/* Process the IOCTL by command */
|
|
|
|
switch (cmd)
|
|
{
|
|
/* ADD IOCTL COMMAND CASES HERE */
|
|
|
|
default:
|
|
ret = -ENOTTY;
|
|
break;
|
|
}
|
|
|
|
nxmutex_unlock(&priv->devlock);
|
|
return ret;
|
|
#endif
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: tc_poll
|
|
****************************************************************************/
|
|
|
|
static int tc_poll(struct file *filep, struct pollfd *fds, bool setup)
|
|
{
|
|
struct inode *inode;
|
|
struct tc_dev_s *priv;
|
|
int ret;
|
|
int i;
|
|
|
|
iinfo("setup: %d\n", (int)setup);
|
|
DEBUGASSERT(filep && fds);
|
|
inode = filep->f_inode;
|
|
|
|
DEBUGASSERT(inode && inode->i_private);
|
|
priv = (struct tc_dev_s *)inode->i_private;
|
|
|
|
/* Are we setting up the poll? Or tearing it down? */
|
|
|
|
ret = nxmutex_lock(&priv->devlock);
|
|
if (ret < 0)
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
if (setup)
|
|
{
|
|
/* Ignore waits that do not include POLLIN */
|
|
|
|
if ((fds->events & POLLIN) == 0)
|
|
{
|
|
ierr("ERROR: Missing POLLIN: revents: %08" PRIx32 "\n",
|
|
fds->revents);
|
|
ret = -EDEADLK;
|
|
goto errout;
|
|
}
|
|
|
|
/* This is a request to set up the poll. Find an available
|
|
* slot for the poll structure reference
|
|
*/
|
|
|
|
for (i = 0; i < CONFIG_TOUCHSCREEN_NPOLLWAITERS; i++)
|
|
{
|
|
/* Find an available slot */
|
|
|
|
if (!priv->fds[i])
|
|
{
|
|
/* Bind the poll structure and this slot */
|
|
|
|
priv->fds[i] = fds;
|
|
fds->priv = &priv->fds[i];
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (i >= CONFIG_TOUCHSCREEN_NPOLLWAITERS)
|
|
{
|
|
ierr("ERROR: No available slot found: %d\n", i);
|
|
fds->priv = NULL;
|
|
ret = -EBUSY;
|
|
goto errout;
|
|
}
|
|
|
|
/* Should we immediately notify on any of the requested events? */
|
|
|
|
if (priv->penchange)
|
|
{
|
|
tc_notify(priv);
|
|
}
|
|
}
|
|
else if (fds->priv)
|
|
{
|
|
/* This is a request to tear down the poll. */
|
|
|
|
struct pollfd **slot = (struct pollfd **)fds->priv;
|
|
DEBUGASSERT(slot != NULL);
|
|
|
|
/* Remove all memory of the poll setup */
|
|
|
|
*slot = NULL;
|
|
fds->priv = NULL;
|
|
}
|
|
|
|
errout:
|
|
nxmutex_unlock(&priv->devlock);
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: pic32mx_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 pic32mx_tsc_setup(int minor)
|
|
{
|
|
struct tc_dev_s *priv;
|
|
char devname[DEV_NAMELEN];
|
|
int ret;
|
|
|
|
iinfo("minor: %d\n", minor);
|
|
DEBUGASSERT(minor >= 0 && minor < 100);
|
|
|
|
/* Configure all touchscreen pins as inputs, undriven */
|
|
|
|
putreg32(LCD_ALL_BITS, PIC32MX_IOPORTB_TRISSET);
|
|
|
|
/* Configure all pins for as digital. AD1PCFG specifies the configuration
|
|
* of device pins to be used as analog inputs. A pin is configured as an
|
|
* analog input when the corresponding PCFGn bit is 0.
|
|
*/
|
|
|
|
putreg32(LCD_ALL_BITS, PIC32MX_ADC_CFGSET);
|
|
|
|
/* Create and initialize a touchscreen device driver instance */
|
|
|
|
#ifndef CONFIG_TOUCHSCREEN_MULTIPLE
|
|
priv = &g_touchscreen;
|
|
#else
|
|
priv = (struct tc_dev_s *)kmm_malloc(sizeof(struct tc_dev_s));
|
|
if (!priv)
|
|
{
|
|
ierr("ERROR: kmm_malloc(%d) failed\n", sizeof(struct tc_dev_s));
|
|
return -ENOMEM;
|
|
}
|
|
#endif
|
|
|
|
/* Initialize the touchscreen device driver instance */
|
|
|
|
memset(priv, 0, sizeof(struct tc_dev_s));
|
|
nxmutex_init(&priv->devlock); /* Initialize device structure mutex */
|
|
nxsem_init(&priv->waitsem, 0, 0); /* Initialize pen event wait semaphore */
|
|
|
|
/* Register the device as an input device */
|
|
|
|
snprintf(devname, sizeof(devname), DEV_FORMAT, minor);
|
|
iinfo("Registering %s\n", devname);
|
|
|
|
ret = register_driver(devname, &g_tc_fops, 0666, priv);
|
|
if (ret < 0)
|
|
{
|
|
ierr("ERROR: register_driver() failed: %d\n", ret);
|
|
goto errout_with_priv;
|
|
}
|
|
|
|
/* Schedule work to perform the initial sampling and to set the data
|
|
* availability conditions.
|
|
*/
|
|
|
|
priv->state = TC_READY;
|
|
ret = work_queue(HPWORK, &priv->work, tc_worker, priv, 0);
|
|
if (ret != 0)
|
|
{
|
|
ierr("ERROR: Failed to queue work: %d\n", ret);
|
|
goto errout_with_priv;
|
|
}
|
|
|
|
/* And return success (?) */
|
|
|
|
return OK;
|
|
|
|
errout_with_priv:
|
|
nxmutex_destroy(&priv->devlock);
|
|
nxsem_destroy(&priv->waitsem);
|
|
#ifdef CONFIG_TOUCHSCREEN_MULTIPLE
|
|
kmm_free(priv);
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
#endif /* CONFIG_INPUT */
|