114 lines
3.0 KiB
C
114 lines
3.0 KiB
C
/* Teensyduino Core Library
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* http://www.pjrc.com/teensy/
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* Copyright (c) 2013 PJRC.COM, LLC.
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* Modifications by Jacob Alexander 2013-2014
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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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// ----- Includes -----
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// Compiler Includes
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#include <string.h> // for memcpy()
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// Project Includes
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#include <Lib/OutputLib.h>
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#include <print.h>
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// Local Includes
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#include "usb_dev.h"
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#include "usb_keyboard.h"
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// ----- Defines -----
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// Maximum number of transmit packets to queue so we don't starve other endpoints for memory
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#define TX_PACKET_LIMIT 4
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// When the PC isn't listening, how long do we wait before discarding data?
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#define TX_TIMEOUT_MSEC 50
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#if F_CPU == 96000000
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#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 596)
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#elif F_CPU == 48000000
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#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 428)
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#elif F_CPU == 24000000
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#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 262)
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#endif
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// ----- Variables -----
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static uint8_t transmit_previous_timeout = 0;
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// ----- Functions -----
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// send the contents of keyboard_keys and keyboard_modifier_keys
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void usb_keyboard_send()
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{
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uint32_t wait_count = 0;
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usb_packet_t *tx_packet;
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while ( 1 )
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{
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if ( !usb_configuration )
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{
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erro_print("USB not configured...");
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return;
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}
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if ( usb_tx_packet_count(KEYBOARD_ENDPOINT) < TX_PACKET_LIMIT )
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{
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tx_packet = usb_malloc();
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if ( tx_packet )
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break;
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}
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if ( ++wait_count > TX_TIMEOUT || transmit_previous_timeout )
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{
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transmit_previous_timeout = 1;
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warn_print("USB Transmit Timeout...");
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return;
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}
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yield();
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}
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// Boot Mode
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*(tx_packet->buf) = USBKeys_Modifiers;
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*(tx_packet->buf + 1) = 0;
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memcpy( tx_packet->buf + 2, USBKeys_Keys, USB_BOOT_MAX_KEYS );
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tx_packet->len = 8;
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// Send USB Packet
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usb_tx( KEYBOARD_ENDPOINT, tx_packet );
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USBKeys_Changed = USBKeyChangeState_None;
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return;
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}
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