142 lines
4.3 KiB
C
142 lines
4.3 KiB
C
/* Teensyduino Core Library
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* http://www.pjrc.com/teensy/
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* Copyright (c) 2018 PJRC.COM, LLC.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* 1. The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* 2. If the Software is incorporated into a build system that allows
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* selection among a list of target devices, then similar target
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* devices manufactured by PJRC.COM must be included in the list of
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* target devices and selectable in the same manner.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "usb_dev.h"
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#include "usb_touch.h"
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#include "core_pins.h" // for millis()
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#include "HardwareSerial.h"
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#ifdef MULTITOUCH_INTERFACE // defined by usb_dev.h -> usb_desc.h
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#if F_CPU >= 20000000
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static uint8_t prev_id=0;
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static uint8_t scan_index=0;
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static uint8_t scan_count=0;
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static uint8_t contactid[MULTITOUCH_FINGERS];
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static uint8_t pressure[MULTITOUCH_FINGERS];
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static uint16_t xpos[MULTITOUCH_FINGERS];
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static uint16_t ypos[MULTITOUCH_FINGERS];
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static uint16_t scan_timestamp;
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void usb_touchscreen_press(uint8_t finger, uint32_t x, uint32_t y, uint32_t press)
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{
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if (finger >= MULTITOUCH_FINGERS) return;
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if (press > 255) press = 255;
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if (x > 32767) x = 32767;
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if (y > 32767) y = 32767;
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__disable_irq();
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if (pressure[finger] == 0 && press > 0) {
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// Begin a new finger touch, assign a
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// new Contact Identifier (usage 0x51)
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uint8_t id = prev_id + 1;
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if (id == 0 || id > 127) id = 1;
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prev_id = id;
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contactid[finger] = (id << 1) | 1;
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}
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xpos[finger] = x;
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ypos[finger] = y;
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pressure[finger] = press;
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__enable_irq();
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}
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// User should allow at least 12 ms after release before starting a
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// new touch with press, in case the host's driver does not properly
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// parse a change in contact identifier to mean a new touch.
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void usb_touchscreen_release(uint8_t finger)
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{
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if (finger >= MULTITOUCH_FINGERS) return;
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pressure[finger] = 0;
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}
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// touch report
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// 0: contact id + on/off
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// 1: pressure
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// 2: X lsb
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// 3: X msb
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// 4: Y lsb
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// 5: Y msb
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// 6: scan time lsb
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// 7: scan time msb
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// Called by the start-of-frame interrupt.
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//
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void usb_touchscreen_update_callback(void)
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{
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if (scan_index == 0) {
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if (usb_tx_packet_count(MULTITOUCH_ENDPOINT) > 1) {
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// wait to begin another scan if if more than
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// one prior packet remains to transmit
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return;
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}
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scan_timestamp = millis() * 10;
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scan_count = 0;
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}
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while (scan_index < MULTITOUCH_FINGERS) {
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uint32_t press = pressure[scan_index];
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uint32_t id = contactid[scan_index];
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if (id) {
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usb_packet_t *tx_packet;
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tx_packet = usb_malloc();
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if (tx_packet == NULL) return;
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if (press == 0) {
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// End a finger touch. One final packet sent
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// with same Contact Identifier (usage 0x51)
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// and Tip Switch (usage 0x42) = zero
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id &= 0xFE;
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contactid[scan_index] = 0;
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}
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*(tx_packet->buf + 0) = id;
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*(tx_packet->buf + 1) = press;
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*(tx_packet->buf + 2) = xpos[scan_index];
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*(tx_packet->buf + 3) = xpos[scan_index] >> 8;
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*(tx_packet->buf + 4) = ypos[scan_index];
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*(tx_packet->buf + 5) = ypos[scan_index] >> 8;
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*(tx_packet->buf + 6) = scan_timestamp;
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*(tx_packet->buf + 7) = scan_timestamp >> 8;
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tx_packet->len = 8;
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usb_tx(MULTITOUCH_ENDPOINT, tx_packet);
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scan_index++;
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return;
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}
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scan_index++;
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}
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if (++scan_count >= MULTITOUCH_FINGERS) {
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// when done early, wait to restart another scan
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scan_index = 0;
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}
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}
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#endif // F_CPU
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#endif // MULTITOUCH_INTERFACE
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